Land Surveyors United - Global Surveying Community2024-03-29T13:47:12Zhttps://landsurveyorsunited.com/hubs/gpsprofessionals/forum/feed/allAffordable GNSS Receivers?https://landsurveyorsunited.com/hubs/gpsprofessionals/forum/affordable-gnss-receivers2020-07-26T19:49:42.000Z2020-07-26T19:49:42.000ZBernie J. Maroccohttps://landsurveyorsunited.com/surveyors/BernieJMarocco<div><p>Greetings GNSS users:</p><p>Does anyone have any experience with iGage GNSS equipment? My small business model and work load cannot justify investment in the high end GNSS equipment in the $30k range. iGage has very reasonable prices on dual frequency receivers ( iG8 ) which, I think, are based on a Trimble board. I know there are other lower cost dual frequency receivers out there; but it seems like this company, as a domestic (USA) supplier, seems to go out of their way to provide strong customer support.</p><p>Thank you;</p><p>Bernie Marocco, PLS</p><p>Western PA </p></div>Promark 3 GPShttps://landsurveyorsunited.com/hubs/gpsprofessionals/forum/promark-3-gps2017-09-29T14:02:15.000Z2017-09-29T14:02:15.000ZHAMZAT KAREEMhttps://landsurveyorsunited.com/surveyors/HAMZATKAREEM<div>i have problem with my promark 3 Gps When i switch it on the programme menu did not display.Please assist</div>Glossary Guide to GPS Termshttps://landsurveyorsunited.com/hubs/gpsprofessionals/forum/glossary-guide-to-gps-terms2012-03-29T01:38:19.000Z2012-03-29T01:38:19.000ZSurveyEarthinaDayhttps://landsurveyorsunited.com/surveyors/SurveyEarthinaDay<div><p>Below is a good start for a glossary style <strong>definitions list related to GPS Terms</strong>.  Feel free to add your terms as comments below the post. </p>
<p align="center"><strong>- A -</strong></p>
<p style="color: #000000; font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: #ffffff; font-size: medium;"><b>Almanac -</b><span class="Apple-converted-space"> </span>the Almanac is a file which contains positional information for all of the GPS satellites. The Almanac is used by the GPS receiver to determine which satellites to track, and can also be used for mission planning.</p>
<p style="color: #000000; font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: #ffffff; font-size: medium;"><b>Attribute -</b><span class="Apple-converted-space"> </span>a characteristic which describes a Feature. Attributes can be thought of as questions which are asked about the Feature.</p>
<p style="color: #000000; font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: #ffffff; font-size: medium;" align="center"><br />
<b>- C -</b><span class="Apple-converted-space"> </span></p>
<p style="color: #000000; font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: #ffffff; font-size: medium;"><b>C/A Code -</b><span class="Apple-converted-space"> </span>the standard (Course/Acquisition) GPS code used by most GIS level GPS receivers. Also known as the civilian code.</p>
<p style="color: #000000; font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: #ffffff; font-size: medium;"><b>Carrier -</b><span class="Apple-converted-space"> </span>the signal that carries the C/A Code from the satellite to the GPS receiver.</p>
<p style="color: #000000; font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: #ffffff; font-size: medium;"><b>Carrier-aided Tracking -</b><span class="Apple-converted-space"> </span>a signal processing technique that uses the GPS carrier signal to achieve an exact lock on the pseudo random code generated by the GPS satellite. Carrier-aided tracking is more accurate than standard C/A Code tracking.</p>
<p style="color: #000000; font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: #ffffff; font-size: medium;"><b>Channel -</b><span class="Apple-converted-space"> </span>a channel of a GPS receiver consists of the circuitry necessary to track the signal from a single GPS satellite.</p>
<p style="color: #000000; font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: #ffffff; font-size: medium;"><b>Cycle Slip -</b><span class="Apple-converted-space"> </span>a loss of continuity in the measured carrier beat phase which results from a temporary loss of lock on a GPS satellite.</p>
<p style="color: #000000; font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: #ffffff; font-size: medium;" align="center"><br />
<b>- D -</b><span class="Apple-converted-space"> </span></p>
<p style="color: #000000; font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: #ffffff; font-size: medium;"><b>Differential Correction -<span class="Apple-converted-space"> </span></b>the technique of comparing GPS data collected in the field to GPS data collected at a known point. By collecting GPS data at a known point, a correction factor can be determined and applied to the field GPS data.</p>
<p style="color: #000000; font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: #ffffff; font-size: medium;"><b>Dilution of Precision</b><span class="Apple-converted-space"> </span><b>(DOP) -</b><span class="Apple-converted-space"> </span>an indicator of satellite geometry for a unique constellation of satellites used to determine a position. Positions tagged with a higher DOP value generally constitute poorer measurement results than those tagged with lower DOP.</p>
<p style="color: #000000; font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: #ffffff; font-size: medium;"><b>Dynamic Positioning -</b><span class="Apple-converted-space"> </span>the process of collecting GPS data while the GPS antenna is in motion. Often associated with Line or Area Features.</p>
<p style="color: #000000; font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: #ffffff; font-size: medium;" align="center"><br />
<b>- E -</b><span class="Apple-converted-space"> </span></p>
<p style="color: #000000; font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: #ffffff; font-size: medium;"><b>Ephemeris -</b><span class="Apple-converted-space"> </span>the predicted changes in the orbit of a satellite that are transmitted to the GPS receiver from the individual satellites.</p>
<p style="color: #000000; font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: #ffffff; font-size: medium;"><b>Ephemeris Errors -</b><span class="Apple-converted-space"> </span>errors which originate in the ephemeris data transmitted by a GPS satellite. Ephemeris errors are removed by differential correction.</p>
<p style="color: #000000; font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: #ffffff; font-size: medium;" align="center"><br />
<b>- F -</b><span class="Apple-converted-space"> </span></p>
<p style="color: #000000; font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: #ffffff; font-size: medium;"><b>Feature -</b><span class="Apple-converted-space"> </span>the object which is being mapped for use in a GIS system. Features may be points, lines or areas.</p>
<p style="color: #000000; font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: #ffffff; font-size: medium;"><b>Featuring -</b><span class="Apple-converted-space"> </span>the process of collecting GPS and GIS information simultaneously.</p>
<p style="color: #000000; font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: #ffffff; font-size: medium;" align="center"><br />
<b>- G -</b><span class="Apple-converted-space"> </span></p>
<p style="color: #000000; font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: #ffffff; font-size: medium;"><b>Geographic Information System (GIS) -<span class="Apple-converted-space"> </span></b>a mapping system which combines positional data with descriptive information to form a layered map.</p>
<p style="color: #000000; font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: #ffffff; font-size: medium;"><b>Global Positioning System (GPS)</b><span class="Apple-converted-space"> </span>- a system for providing precise location which is based on data transmitted from a constellation of 24 satellites</p>
<p style="color: #000000; font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: #ffffff; font-size: medium;" align="center"><br />
<b>- L -</b><span class="Apple-converted-space"> </span></p>
<p style="color: #000000; font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: #ffffff; font-size: medium;"><b>L-band -</b><span class="Apple-converted-space"> </span>the group of radio frequencies which carry the GPS data from the satellites to the GPS receivers.</p>
<p style="color: #000000; font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: #ffffff; font-size: medium;" align="center"><br />
<b>- M -</b><span class="Apple-converted-space"> </span></p>
<p style="color: #000000; font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: #ffffff; font-size: medium;"><b>Multipath -<span class="Apple-converted-space"> </span></b>the interference to a signal that has reached the receiver antenna by multiple paths; usually caused by the signal being bounced or reflected. Signals from satellites low on the horizon will have high multipath error. Receivers that can be configured to "mask out" signals from such satellites can help minimize multi-path.</p>
<p style="color: #000000; font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: #ffffff; font-size: medium;" align="center"><br />
<b>- P -</b><span class="Apple-converted-space"> </span></p>
<p style="color: #000000; font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: #ffffff; font-size: medium;"><b>Pseudorange -</b><span class="Apple-converted-space"> </span>an uncorrected measurement of the distance between a GPS satellite and a GPS receiver determined by comparing a code transmitted by the satellite to a code generated by the receiver.</p>
<p style="color: #000000; font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: #ffffff; font-size: medium;" align="center"><br />
<b>- R -</b><span class="Apple-converted-space"> </span></p>
<p style="color: #000000; font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: #ffffff; font-size: medium;"><b>Residual -</b><span class="Apple-converted-space"> </span>a quality indicator for a GPS position that is determined during the differential correction process. Indicates uncorrectable error. High residuals are not desirable.</p>
<p style="color: #000000; font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: #ffffff; font-size: medium;" align="center"><br />
<b>- S -</b><span class="Apple-converted-space"> </span></p>
<p style="color: #000000; font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: #ffffff; font-size: medium;"><b>Satellite Constellation</b><span class="Apple-converted-space"> </span><b>-<span class="Apple-converted-space"> </span></b>the group of GPS satellites from which data is used to determine a position.</p>
<p style="color: #000000; font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: #ffffff; font-size: medium;"><b>Static Positioning -</b><span class="Apple-converted-space"> </span>the process of averaging GPS positions taken successively over a period of time with a stationary antenna to increase accuracy.</p>
<p style="color: #000000; font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: #ffffff; font-size: medium;" align="center"><br />
<b>- V -</b><span class="Apple-converted-space"> </span></p>
<p style="color: #000000; font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: #ffffff; font-size: medium;"><b>Value -</b><span class="Apple-converted-space"> </span>descriptive information about a Feature. Values can be thought of as the answers to the questions posed by Attributes.</p>
</div>GPS and Canopyhttps://landsurveyorsunited.com/hubs/gpsprofessionals/forum/gps-and-canopy2012-03-29T01:32:41.000Z2012-03-29T01:32:41.000ZSurveyEarthinaDayhttps://landsurveyorsunited.com/surveyors/SurveyEarthinaDay<div><h3>Causing Interference</h3>
<p style="color: #000000; font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: #ffffff; font-size: medium;"><a target="_self" href="http://landsurveyorsunited.com/group/gpsprofessionals"><img class="align-right" src="{{#staticFileLink}}1200644840,original{{/staticFileLink}}" width="356" /></a>GPS receivers require a line of sight to the satellites in order to obtain a signal representative of the true distance from the satellite to the receiver. Therefore, any object in the path of the signal has the potential to interfere with the reception of that signal. Objects which can block a GPS signal include <strong>tree canopy</strong>, <strong>buildings</strong> and <strong>terrain features</strong>.</p>
<p style="color: #000000; font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: #ffffff; font-size: medium;">Further, <strong>reflective surfaces</strong> can cause the GPS signals to bounce before arriving at a receiver, thus causing an error in the distance calculation. This problem, known as <em>multipath</em>, can be caused by a variety of materials including water, glass and metal. The water contained in the leaves of vegetation can produce multipath error. In some instances, operating under heavy, wet forest canopy can degrade the ability of a GPS receiver to track satellites.</p>
<h3>Data Collection Techniques</h3>
<p style="color: #000000; font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: #ffffff; font-size: medium;">There are several data collection techniques which can mitigate the effects of <strong>signal blockage</strong> by tree canopy or other objects. For example, many GPS receivers can be instructed to track only the highest satellites in the sky, as opposed to those satellites which provide the best DOP. Increasing the elevation of the GPS antenna can also dramatically increase the ability of the receiver to track satellites.</p>
<p style="color: #000000; font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: #ffffff; font-size: medium;">Unfortunately, there will be locations where GPS signals simply are not available due to obstruction. In these cases, there are additional techniques which can help to solve the problem. Some GPS receivers have the ability to collect an offset point, which involves recording a GPS position at a location where GPS signals are available while also recording the distance, bearing and slope from the GPS antenna to the position of interest where the GPS signals are not available. This technique is useful for avoiding a dense timber stand or building.</p>
<p style="color: #000000; font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: #ffffff; font-size: medium;">Further, a traditional traverse program can be used to manually enter a series of bearings and ranges to generate positions until satellite signals can again be received. This position data can then be used to augment position data collected with the GPS receiver.</p>
<p style="color: #000000; font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: #ffffff; font-size: medium;"></p>
</div>OPUS Post Processinghttps://landsurveyorsunited.com/hubs/gpsprofessionals/forum/opus-post-processing2012-02-20T18:05:49.000Z2012-02-20T18:05:49.000Zmarcel milleurhttps://landsurveyorsunited.com/surveyors/marcelmilleur<div><div style="widows: 2; text-transform: none; background-color: #ffffff; text-indent: 0px; font: 19px 'bookman old style', 'new york', times, serif; white-space: normal; orphans: 2; letter-spacing: normal; color: #000000; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;"><span>Re: <a rel="nofollow" style="outline-width: 0px; color: #234786; text-decoration: underline;" href="http://www.ngs.noaa.gov/OPUS/" target="_blank"><span id="lw_1329738131_0" class="yshortcuts">http://www.ngs.noaa.gov/OPUS/</span></a></span></div><div style="widows: 2; text-transform: none; background-color: #ffffff; text-indent: 0px; font: 19px 'bookman old style', 'new york', times, serif; white-space: normal; orphans: 2; letter-spacing: normal; color: #000000; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;"> </div><div style="widows: 2; text-transform: none; background-color: #ffffff; text-indent: 0px; font: 19px 'bookman old style', 'new york', times, serif; white-space: normal; orphans: 2; letter-spacing: normal; color: #000000; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;">First time user.......</div><div style="widows: 2; text-transform: none; background-color: #ffffff; text-indent: 0px; font: 19px 'bookman old style', 'new york', times, serif; white-space: normal; orphans: 2; letter-spacing: normal; color: #000000; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;"></div><div style="widows: 2; text-transform: none; background-color: #ffffff; text-indent: 0px; font: 19px 'bookman old style', 'new york', times, serif; white-space: normal; orphans: 2; letter-spacing: normal; color: #000000; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;">Sokkia Startus L1 ..... Seems like I filled out the form correctly.</div><div style="widows: 2; text-transform: none; background-color: #ffffff; text-indent: 0px; font: 19px 'bookman old style', 'new york', times, serif; white-space: normal; orphans: 2; letter-spacing: normal; color: #000000; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;"></div><div style="widows: 2; text-transform: none; background-color: #ffffff; text-indent: 0px; font: 19px 'bookman old style', 'new york', times, serif; white-space: normal; orphans: 2; letter-spacing: normal; color: #000000; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;">I've converted the raw file (*.str) to Rinex format and uploaded it to OPUS</div><div style="widows: 2; text-transform: none; background-color: #ffffff; text-indent: 0px; font: 19px 'bookman old style', 'new york', times, serif; white-space: normal; orphans: 2; letter-spacing: normal; color: #000000; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;"></div><div style="widows: 2; text-transform: none; background-color: #ffffff; text-indent: 0px; font: 19px 'bookman old style', 'new york', times, serif; white-space: normal; orphans: 2; letter-spacing: normal; color: #000000; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;">ERROR MSG:</div><div style="widows: 2; text-transform: none; background-color: #ffffff; text-indent: 0px; font: 19px 'bookman old style', 'new york', times, serif; white-space: normal; orphans: 2; letter-spacing: normal; color: #000000; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" id="yui_3_2_0_1_13297351394222932"><span style="font-family: arial, helvetica, sans-serif; color: #454545; font-size: 13px;">FILE: 17691301.12O OP1329502833064</span><br style="font-family: arial, helvetica, sans-serif; color: #454545; font-size: 13px;"/><br style="font-family: arial, helvetica, sans-serif; color: #454545; font-size: 13px;"/><span style="font-family: arial, helvetica, sans-serif; color: #454545; font-size: 13px;">1010 The RINEX dataset submitted to OPUS only contained data for a single</span><br style="font-family: arial, helvetica, sans-serif; color: #454545; font-size: 13px;"/><span style="font-family: arial, helvetica, sans-serif; color: #454545; font-size: 13px;">1010 frequency. Dual frequency data is needed for processing.</span><br style="font-family: arial, helvetica, sans-serif; color: #454545; font-size: 13px;"/><span style="font-family: arial, helvetica, sans-serif; color: #454545; font-size: 13px;">1010 Aborting...</span><br style="font-family: arial, helvetica, sans-serif; color: #454545; font-size: 13px;"/><span style="font-family: arial, helvetica, sans-serif; color: #454545; font-size: 13px;">1010</span> </div><div style="widows: 2; text-transform: none; background-color: #ffffff; text-indent: 0px; font: 19px 'bookman old style', 'new york', times, serif; white-space: normal; orphans: 2; letter-spacing: normal; color: #000000; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;"></div><div style="widows: 2; text-transform: none; background-color: #ffffff; text-indent: 0px; font: 19px 'bookman old style', 'new york', times, serif; white-space: normal; orphans: 2; letter-spacing: normal; color: #000000; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;"><span style="color: #ff0000;">Am I doing something wrong ?</span></div></div>trimble r8 base and rover with trimble controller and trimble softwarehttps://landsurveyorsunited.com/hubs/gpsprofessionals/forum/trimble-r8-base-and-rover-with-trimble-controller-and-trimble2012-01-20T10:57:04.000Z2012-01-20T10:57:04.000Zbrian staufferhttps://landsurveyorsunited.com/surveyors/brianstauffer<div><p>My question/problem is once my set up is complete and I go and tell the controller to start survey, Iget 100%reliability my sats drop in half meaning i have say 12 to 13 it goes to 6or7 . the glonss box and lc2 are both checked</p><p>Bri in fl</p></div>Home-Made GPS Receiver How-tohttps://landsurveyorsunited.com/hubs/gpsprofessionals/forum/home-made-gps-receiver-how-to2011-10-22T01:41:39.000Z2011-10-22T01:41:39.000Z⚡Survenator⌁https://landsurveyorsunited.com/surveyors/Survenator<div><p><a href="http://www.holmea.demon.co.uk/GPS/Main.htm" target="_blank"><img src="{{#staticFileLink}}1200636879,original{{/staticFileLink}}" width="350" class="align-right" /></a>I was blown away when I saw (via <a target="_blank" href="http://blog.makezine.com/archive/2011/10/homemade-gps-receiver.html">Make</a>)that someone had created a home-made GPS receiver.  <a href="http://www.holmea.demon.co.uk/GPS/Main.htm" target="_blank">Andrew Holme</a> just may be a genius. He built an incredible four-channel GPS receiver using some repurposed <a href="http://en.wikipedia.org/wiki/Field-programmable_gate_array" target="_blank">FPGA board</a> from a previous frequency synthesizer project. Then, by connecting it to a PC running a console app, Andrew’s receiver is now capable of tracking at least four satellites simultaneously, which is good enough to capture lat, long, and altitude.  This homemade GPS receiver should not be confused with the ultra-cool <a target="_self" href="http://landsurveyorsunited.com/group/gpsprofessionals/forum/topics/poor-mans-gps-network-by-phil">Poor mans GPS</a>.  <a target="_blank" href="http://www.holmea.demon.co.uk/GPS/Main.htm">Read about the whole process here</a> and be amazed.</p>
<p> </p>
<blockquote>
<p> <br />
Solutions are computed in earth-centred, earth-fixed (ECEF) coordinates. User location is converted to latitude, longitude and altitude with a correction for eccentricity of the earth, which bulges at the equator. (<a target="_blank" href="http://blog.makezine.com/archive/2011/10/homemade-gps-receiver.html">Make</a>)</p>
</blockquote>
<p><a target="_blank" href="http://www.holmea.demon.co.uk/GPS/Main.htm"><img class="align-full" width="600" src="{{#staticFileLink}}1200636969,original{{/staticFileLink}}" /></a></p>
</div>HTC Android GPS Appshttps://landsurveyorsunited.com/hubs/gpsprofessionals/forum/htc-android-gps-apps2011-09-22T16:15:28.000Z2011-09-22T16:15:28.000ZGary Breischhttps://landsurveyorsunited.com/surveyors/GaryBreisch<div><p> </p>
<p><strong><span class="font-size-5">I want a free or low priced GPS app or program that will show and store bread crumb "trails" to the SD card.  I will use it on an Android Desire Phone Device and/or transfer and show on PC and overlay onto Google Maps or Google Earth. </span></strong><br />
<br />
<strong><span class="font-size-5">Display of the trails will have both time and lat/lon placemarks with polylines between trial interval points that vary depending on speed.  Walking speed might be every 25 to 50 feet while highway trail points are shown at 500 to 1000 feet at 65 to 75 miles per hour.</span></strong><br />
<br />
<strong><span class="font-size-5">search GPS android App Trails SD Storeage Display:</span></strong><br />
<br />
<strong><span class="font-size-5">GPS Trails Lite</span></strong><br />
<strong><span class="font-size-5">Trail availability is limited. My tracks simply disappeared, along with my login. Better apps are imapmywalk and google maps mytracks. HTC incredible</span></strong><br />
<br />
<strong><span class="font-size-5">search google maps mytrack:</span></strong><br />
<strong><span class="font-size-5">My Tracks is an application for your AndroidTM phone that enables you to record GPS tracks and view live statistics – such as time, speed, distance, and elevation – while hiking, biking, running or participating in other outdoor activities. Once recorded, you can share your tracks, upload them to Google Spreadsheets and visualize them on Google My Maps.</span></strong><br />
<strong><span class="font-size-5"><a target="_self" href="{{#staticFileLink}}1200635734,original{{/staticFileLink}}"><img class="align-full" src="{{#staticFileLink}}1200635734,original{{/staticFileLink}}" width="400" /></a></span></strong><br />
<strong><span class="font-size-5">While recording tracks, you can:</span></strong><br />
<br />
<strong><span class="font-size-5">See location / progress on a map</span></strong><br />
<strong><span class="font-size-5">Monitor real-time statistics: time, distance, speed, elevation</span></strong><br />
<strong><span class="font-size-5">View elevation profile by time or distance</span></strong><br />
<strong><span class="font-size-5">Zoom, pan elevation profile</span></strong><br />
<strong><span class="font-size-5">Create waypoints</span></strong><br />
<strong><span class="font-size-5">Create statistics waypoints (splits tracks into subtracks)</span></strong><br />
<strong><span class="font-size-5">To share tracks, you can:</span></strong><br />
<br />
<strong><span class="font-size-5">Upload to Google Map (example)</span></strong><br />
<strong><span class="font-size-5">Upload to Google Docs (example)</span></strong><br />
<strong><span class="font-size-5">Email as a Google My Map link</span></strong><br />
<strong><span class="font-size-5">Embed Google Map on a website</span></strong><br />
<strong><span class="font-size-5">Email as .gpx or .kml attachments</span></strong><br />
<strong><span class="font-size-5">Export as .gpx or .kml to phone SD card</span></strong><br />
<strong><span class="font-size-5">Tweet your My Map link on Twitter using Twidroid</span></strong><br />
<br />
<strong><span class="font-size-5">My Tracks Frequently Asked Questions</span></strong><br />
<br />
<strong><span class="font-size-5">What is My Tracks?</span></strong><br />
<strong><span class="font-size-5">How do I install the My Tracks application?</span></strong><br />
<strong><span class="font-size-5">Which phones support the My Tracks application?</span></strong><br />
<strong><span class="font-size-5">How do I see the statistics and elevation profile?</span></strong><br />
<strong><span class="font-size-5">Why does the application sometimes display Waiting for a better GPS fix. Make sure the sky is visible?</span></strong><br />
<br />
<strong><span class="font-size-5">My Tracks records your GPS tracks and shows live statistics such as time, speed, distance, and elevation – while hiking, cycling, running or participating in other outdoor activities. Once recorded, you can share your tracks, upload them to Google Spreadsheets and visualize them on Google My Maps.</span></strong><br />
<br />
<br />
<strong><span class="font-size-5">App causing DroidX to panic logging statistics</span></strong><br />
<strong><span class="font-size-5">By Press9 - Sep 21 - 1 author - 0 replies</span></strong><br />
<strong><span class="font-size-5">Could not start MyTracks</span></strong><br />
<strong><span class="font-size-5">By rosenholms - Sep 20 - 5 authors - 7 replies</span></strong><br />
<strong><span class="font-size-5">Innaccurate recordings</span></strong><br />
<strong><span class="font-size-5">By Ken Taylor - Sep 19 - 17 authors - 22 replies</span></strong><br />
<strong><span class="font-size-5">[My Tracks] Navigation with Tracks</span></strong><br />
<strong><span class="font-size-5">By Gary Dunn - Sep 19 - 4 authors - 4 replies</span></strong><br />
<strong><span class="font-size-5">[My Tracks] Re: SPEED? ...as used in the CSV file</span></strong><br />
<strong><span class="font-size-5">By Sandor Dornbush - Sep 19 - 3 authors - 2 replies</span></strong><br />
<strong><span class="font-size-5">[My Tracks] updates and misc touches</span></strong><br />
<strong><span class="font-size-5">By Gary Dunn - Sep 19 - 2 authors - 1 reply</span></strong><br />
<strong><span class="font-size-5">CSV Download File Format</span></strong><br />
<strong><span class="font-size-5">By Ken Taylor - Sep 18 - 2 authors - 1 reply</span></strong><br />
<strong><span class="font-size-5">Polar Bluetooth Heart Rate Monitor</span></strong><br />
<strong><span class="font-size-5">By Leslie Wong - Sep 16 - 1 author - 0 replies</span></strong><br />
<strong><span class="font-size-5">[My Tracks] Benefits of GEarth over GMaps?</span></strong><br />
<strong><span class="font-size-5">By Karl Turek - Sep 16 - 2 authors - 1 reply</span></strong><br />
<br />
<strong><span class="font-size-5">These Applications enhance the functionality of My Tracks.</span></strong><br />
<br />
<strong><span class="font-size-5">Search for these Applications by name on the Android Market or scan the Application's barcode within the link. (To install the Barcode Scanner, search for "Barcode Scanner" on the Android Market).</span></strong></p>
</div>LightSquared GPShttps://landsurveyorsunited.com/hubs/gpsprofessionals/forum/lightsquared-gps2011-06-11T21:11:16.000Z2011-06-11T21:11:16.000ZScott D. Warner, PLShttps://landsurveyorsunited.com/surveyors/ScottDWarnerRLS<div><p><strong>LightSquared GPS</strong> is a problem! We need more discussion on this topic because it affects every Land Surveyor on Earth. We could even have a group solely dedicated to this topic, but for now the GPS group will have to speak LOUD about the emerging threat to our GPS signals. Unless every member here on LSU is willing to go back to the days before GPS we have to UNITE and voice our concerns about the legitimate threat of being shut down as a small group of users of the GPS constellation of sattelites.</p><p>In case you have not been informed, LightSquared (a private company that recently received a <strong>WAIVER FROM THE FCC</strong> to develop its 4G wireless network close to the GPS spectrum) continues to move forward with its planned activities; which could disrupt GPS usage.</p><p>If any member has news or other information on the developments on this topic, please share it here or do not fear retribution for creating an LSU Group dedicated to this highly important issue. </p><p>I will allow only one week for somebody to spearhead a group on LSU before I take the initiative to do so myself. The reason that I offer this is because I am not an expert in the happenings involving LightSquared. I am hoping that we have a member that is more informed than I am on the subject and is willing to invest a few minutes to be the moderator of a group that may have the potential to have an influence on the outcome of the inherent threat that LightSquared poses.</p><p> </p><p>Please help your profession by contributing your thoughts and ideas.</p></div>Master Survey Programshttps://landsurveyorsunited.com/hubs/gpsprofessionals/forum/master-survey-programs-12011-05-29T03:36:46.000Z2011-05-29T03:36:46.000ZRAJASEKARANhttps://landsurveyorsunited.com/surveyors/RAJASEKARAN<div><p> </p><p> </p><p><a target="_self" href="http://storage.ning.com/topology/rest/1.0/file/get/2653730103?profile=original">Master Survey Programs</a></p></div>Poor Mans GPS Network by Phil Stevensonhttps://landsurveyorsunited.com/hubs/gpsprofessionals/forum/poor-mans-gps-network-by-phil2011-03-27T21:05:14.000Z2011-03-27T21:05:14.000ZJaybirdhttps://landsurveyorsunited.com/surveyors/Jaybird<div><a href="http://landsurveyorsunited.com/profile/PhilStevenson" target="_self">Phil Stevenson</a>, Land Surveyors United member, Magellan-Ashtech equipment expert and professional self-proclaimed <em>"Dirt Surveyor"</em> wrote a paper once called "Poor Man's GPS Network," which I have for you below to download and read.<br />
<a target="_blank" href="http://www.scribd.com/doc/188435/Poor-Mans-GPS"><img class="align-right" width="360" src="{{#staticFileLink}}1200620961,original{{/staticFileLink}}" alt="Poor mans GPS network" /></a><br />
<br />
<embed wmode="opaque" src="http://embedit.in/WgNaEyD8x4.swf" height="400" width="466" type="application/x-shockwave-flash" allowfullscreen="false" allowscriptaccess="never"></embed> Click to Open and Read Poor Man's GPS or download below. If you're interested in this, you may also like reading <a target="_self" href="http://landsurveyorsunited.com/group/onemanshow/forum/topics/using-cellular-phone-to?xg_source=activity">How to Connect to RTK using a cellphone</a>.
</div>Virtual Reference Stationhttps://landsurveyorsunited.com/hubs/gpsprofessionals/forum/virtual-reference-station2011-02-25T23:23:22.000Z2011-02-25T23:23:22.000ZTy Olinghousehttps://landsurveyorsunited.com/surveyors/TyOlinghouse<div><p>Here are some informative papers on VRS, I found while surfing the net</p></div>Repeater Set Up?https://landsurveyorsunited.com/hubs/gpsprofessionals/forum/repeater-set-up2011-01-13T22:18:05.000Z2011-01-13T22:18:05.000ZPaul Quaggehttps://landsurveyorsunited.com/surveyors/PaulQuagge<div>Hello, could someone please walk me through configuring and setting up a repeater? I have a Pacific Crest HPB450 radio. I have a lot of options for GPS equipment...we have a R7, 5700,5800,4800.... trimark3's....multiple antenna types. We can also connect to a network using cell phone/internet connection. We have cobs and cors stations available. Any help would be appreciated. Thanks,Paul</div>Repair and Replacement of TouchScreenshttps://landsurveyorsunited.com/hubs/gpsprofessionals/forum/repair-and-replacement-of2010-10-25T03:14:16.000Z2010-10-25T03:14:16.000ZGary Breischhttps://landsurveyorsunited.com/surveyors/GaryBreisch<div>When it comes to equipment, one needs to be able to get it fixed quickly to reduce downtime.  I have had experiences with the Promark3RTK unit that has a damaged touch screen. The units slipped out of the pole mount bracket, swung down on by the antenna cable that got dinged by the pole of clamp somehow.<br />
<br />
The unit still works by using the finger buttons in the Survey Program that does static GPS due to its simplicity but is too complicated to use without the touch screen options in the FastSurvey RTK program. <br />
<br />
So I need someone to help me get the touch screen fixed without paying an arm and a leg.  Magellan or Ashtech is poor about making it easy to get information on fixing it and I am concerned that it would not be worth the cost and effort to try anymore. I have observed that the cell phone industry has technical people who can repair any touch screen (replace it) for a forth of the cost or less.<br />
<br />
I just need to find someone locally or who can be trusted to fix the touch screen. Can anyone out there help me with this.
</div>ADGPS GrafNavhttps://landsurveyorsunited.com/hubs/gpsprofessionals/forum/adgps-grafnav2010-08-10T07:26:26.000Z2010-08-10T07:26:26.000ZRich Maherhttps://landsurveyorsunited.com/surveyors/RichMaher<div><p>I've been occasionally providing camera positions of an airborne camera for photogrammetry. I had been doing it in TGO and once in TBC, but found these wonderful software packages choked down by data as dense as at least 1hz and sometimes up to 10hz.</p><p> </p><p>Recently I've demo'd a software package called GrafNav and it was simply amazing (comparatively). Not that it wasn't without its own challenges and learning curves.</p><p> </p><p>Anyways ... does anyone else do ADGPS work and what software do you prefer? I'm interested in this new software I'm trying, but it is just a little expensive for how little I do this ($8k the first year and $2k/yr thereafter).</p><p> </p><p>Take care,</p><p> </p><p>Rich</p><p> </p><p><font face="Georgia">"When you come to the end of your rope, tie a knot and hang on." ~Franklin D. Roosevelt</font></p></div>PenBay Selects Trimble's Indoor Mobile Mapping to Expand Serviceshttps://landsurveyorsunited.com/hubs/gpsprofessionals/forum/penbay-selects-trimbles-indoor2010-03-06T11:24:27.000Z2010-03-06T11:24:27.000ZJimhttps://landsurveyorsunited.com/surveyors/Jim<div><p><strong>PenBay Selects Trimble's Indoor Mobile Mapping to Expand Services</strong><br/>March 05,2010<br/>PenBay Solutions LLC has selected the Trimble Indoor Mobile Mapping Solution (TIMMS) for indoor mapping service. PenBay, which specializes in bringing Geographic Information Systems (GIS) technology inside buildings, will use TIMMS to expand PenBay’s current solutions for real property and public safety applications, helping facility managers, space planners and emergency response agencies understand the critical infrastructure of buildings.The goal of PenBay’s expanded service is to ...</p><p> </p><p><a rel="nofollow" href="http://www.gpsworld.com/government/emergency-response/news/penbay-selects-trimbles-indoor-mobile-mapping-expand-services-964">http://www.gpsworld.com/government/emergency-response/news/penbay-selects-trimbles-indoor-mobile-mapping-expand-services-964</a></p></div>Previously Delayed GLONASS Satellites Launchedhttps://landsurveyorsunited.com/hubs/gpsprofessionals/forum/previously-delayed-glonass2010-03-03T14:54:01.000Z2010-03-03T14:54:01.000ZJimhttps://landsurveyorsunited.com/surveyors/Jim<div><h1>Previously Delayed GLONASS Satellites Launched</h1><span class="innerArticle_span">March 2, 2010</span> <span class="innerArticle_span">By: <a rel="nofollow" href="http://www.gpsworld.com/gps-author/richard-b-langley/96">Richard B. Langley</a></span><hr/><br/><p><img alt="" src="http://www.gpsworld.com/files/gpsworld/nodes/2010/9627/Roscosmos3.png" width="469" height="352"/></p><p>Roscosmos has confirmed a successful launch of the GLONASS-M satellites on March 1 at 21:19 UTC. The satellites were released from the upper stage at 00:52 UTC on March 2. <br/><br/>"In the first communication session with the satellites, telemetry data was obtained that confirmed that the state of all systems of the spacecraft is normal and corresponds to the flight program," Roscosmos said in a statement.<br/><br/>This launch was the Block 40 GLONASS launch postponed from September 2009. The satellites launched are numbers 31, 32, and 35. Numbers 31 and 32, along with number 30, were in the original Block 40 manifest but were shipped back to the Reshetnev plant when a problem occurred with a satellite already on orbit. The new satellites shared some component history with the faulty satellite and needed to be serviced at the factory before flight. Satellite 30 was included in the Block 41 triad launched on December 14, 2009. The Block 40 satellites are expected to be in service in April, according to Roscosmos.</p><p>Likely in preparation for the launch of the three new satellites, GLONASS authorities have formally decommissioned two satellites that have been unusable for months. GLONASS 701, in slot 6 (orbit plane 1) and the first of the operational GLONASS-M satellites to be placed in orbit, was decommissioned on February 27. It had been set unhealthy since since June 18, 2009. GLONASS 713, in slot 24 (orbit plane 3), was decommissioned on February 28, 2010. It had been set unhealthy since November 2, 2009.</p><p><img alt="" src="http://www.gpsworld.com/files/gpsworld/nodes/2010/9627/Roscosmos2.png" width="288" height="432"/> <br/><br/>Scheduled timeline (UTC) of events:<br/>21:19:44 — Proton-M liftoff<br/>21:29:30 — DM-2 separation from Proton-M third stage<br/>21:55:59...22:02:15 — DM-2 first burn<br/>00:49:02...00:51:36 — DM-2 second burn<br/>00:51:51 — GLONASS-M block separation from DM-2<br/><br/>NORAD is tracking four objects (the satellites and the DM-2 fourth stage engine) in near circular orbits close to the usual GLONASS orbit height. Further tracking data and analysis will be required to determine which satellite is which.<br/><br/>OBJECT A<br/>1 36400U 10007A 10061.01638160 .00000024 00000-0 00000+0 0 13<br/>2 36400 064.9920 154.6746 0019598 035.0614 325.0959 02.12476589 06</p><p><br/>OBJECT B<br/>1 36401U 10007B 10061.01678030 .00000024 00000-0 00000+0 0 14<br/>2 36401 064.7140 154.4440 0033304 040.5927 319.7043 02.12008990 08</p><p>OBJECT C<br/>1 36402U 10007C 10061.01623522 .00000024 00000-0 00000+0 0 11<br/>2 36402 064.7725 154.5000 0005108 115.7778 244.0714 02.12924317 06</p><p>OBJECT D<br/>1 36403U 10007D 10061.01661501 .00000024 00000-0 00000+0 0 11<br/>2 36403 064.7664 154.4868 0008060 176.6485 183.4263 02.13267944 03</p><h3>Videos and Photos</h3><p><a rel="nofollow" href="http://www.tv-tsenki.com/" target="_blank">Live video of the launch is available here</a>. Click on the link at bottom of the web page. Coverage runs from 19:20 to 22:20 UTC (14:20 to 17:20 EST). TV Roscosmos has added <a rel="nofollow" href="http://www.tvroscosmos.ru/frm/video/start67.php" target="_blank">two new videos of launch preparations</a> on its website and on YouTube. Other launch videos are from the Russian TV news channel <a rel="nofollow" href="http://tvroscosmos.ru/frm/kosmostv/vesti/2010/vesti020310.php" target="_blank">Russia 24</a>, including the clip of live launch coverage.</p><p><a rel="nofollow" href="http://www.roscosmos.ru/main.php?id=2&nid=9497" target="_blank">Launch photos are available here</a>.</p><h3>Notice Advisory to GLONASS Users Issued</h3><p>Here is the NAGU announcing the launch:<br/><br/>015-100302</p><p>NOTICE ADVISORY TO GLONASS USERS (NAGU) 015-100302</p><p>SUBJ: LAUNCH SUMMARY BLOCK 40</p><ol><li>CONDITION: BLOCK 40 LAUNCH WAS PERFORMED ON 02.03.2010 (00:19:44). THE NEW GLONASS SATELLITE (731/KOSMOS 2459, 732/KOSMOS 2460, 735/KOSMOS 2461, ) WILL BE PLACED INTO SLOTS 22/23/24 CORRESPONDENTLY.</li><li>USERS ARE REMINDED TO UPDATE ALMANACS IF NECESSARY.</li></ol><h3><img alt="" src="http://www.gpsworld.com/files/gpsworld/nodes/2010/9627/Roscosmos.png" width="288" height="432"/></h3></div>Take GPS Indoorshttps://landsurveyorsunited.com/hubs/gpsprofessionals/forum/take-gps-indoors2010-03-02T01:35:38.000Z2010-03-02T01:35:38.000ZJimhttps://landsurveyorsunited.com/surveyors/Jim<div><div id="pgtitle">Indoor Positioning</div><div id="innerArticle"><h1>Rosum, Siano Introduce ALLOY Chip Using TV Signals to Take GPS Indoors</h1><span class="innerArticle_span">March 1, 2010</span><hr/><br/><p>Rosum Corporation announced today the launch of ALLOY, a location and synchronization solution for indoor and urban environments. The ALLOY chip, which was developed in partnership with Siano — supplier of mobile digital TV receiver chips for handsets, laptops, PNDs, and other mobile devices — uses broadcast TV signals to provide precise frequency, timing, and location information. <br/><br/>According to Rosum, the chip opens up a multitude of new commercial opportunities by enabling femtocell synchronization and location, tracking of people and assets, and localized advertising over mobile TV devices in deep indoor locations such as shopping malls, hotels, campuses, and factories with seamless delivery leveraging broadcast TV signals.<br/> <br/>Traditional positioning systems are satellite-based, designed for outdoor applications and have limitations both indoors and in urban environments. The ALLOY client combines the ALLOY chip with a high-sensitivity assisted GPS chip into a tightly coupled hybrid TV-GPS solution which works across all types of environments: rural, suburban, urban, and indoor. Broadcast TV signals have a 100,000x power margin advantage over GPS, and this extends location and synchronization capabilities deep into buildings and urban environments.<br/> <br/>According to Dominique Bonte, Practice Director, Telematics and Navigation, for ABI Research, the market for wireless location-based applications is expected to reach $14.5 billion in 2014. “The success of these applications will depend on the pervasive availability of the location technologies that enable them. Alternative positioning technologies such as ALLOY are critical (in addressing the limitations of GPS)."<br/> <br/>“Femtozone location-based applications provide an enhanced value proposition in addition to the voice and data services that are being currently rolled out. By 2014, ABI Research expects 40 million unit shipments for femtocells. This presents an exciting market opportunity for innovative solutions like those from Rosum that solve problems of indoor positioning and synchronization, which are critical for mass-market femtocell deployment,” said Aditya Kaul, practice director, Mobile Networks for ABI Research.<br/><br/>Applications of ALLOY include femtocell synchronization and location, indoor and urban tracking of people and assets, and location-based services and advertising for mobile TV devices. Specific examples:</p><ul><li>Femtocells require accurate timing, frequency and location for quick start-up, interference management, and E911 location. Competing solutions can require 60-90 minutes or more to start-up and require placement by the window. ALLOY reduces this time dramatically (typically three minutes) and extends coverage deep indoors, where femtocells are most valuable.</li><li>Tracking service providers require continuous tracking across all environments — outdoor, indoor, and urban. High-value assets and people tend to be indoors or in urban areas where GPS signals are often unavailable, but TV signals are abundant. ALLOY keeps assets and people under monitoring in areas where GPS-based solutions fail.</li><li>Mobile services and advertisements are worth more when they are based on the precise location of the customer’s handset even when indoors, such as inside malls, campuses, etc. Location-enabled TV provides a platform for new and expanded revenue streams for broadcasters and carriers.</li></ul><p>“Rosum’s technology opens a new era in location-based applications and services,” said Alon Ironi, CEO of Siano. “Our cooperation with Rosum will enable every user of a handheld device to not only watch TV everywhere, but also benefit from an abundance of location-based services everywhere, even where the line-of-sight to the global positioning satellites is blocked.”<br/> <br/>“Siano’s high-performance, low-power Mobile DTV solution is the ideal platform for effective deployment of Rosum TV-location technology,” said Todd Young, VP Business Development of Rosum. “Partnering with Siano puts our robust location technology in an easy-to-integrate form factor for device makers worldwide.”<br/> </p></div></div>The Future Augmentedhttps://landsurveyorsunited.com/hubs/gpsprofessionals/forum/the-future-augmented2010-03-01T22:48:12.000Z2010-03-01T22:48:12.000ZJimhttps://landsurveyorsunited.com/surveyors/Jim<div>future Augmented <span class="innerArticle_span">March 1, 2010</span> <span class="innerArticle_span">By:</span> <span class="innerArticle_span">GPS World</span><hr/><h3>Coverage Improvement for Dual-Frequency SBAS</h3><br/><h4>After reviewing current performance of WAAS, EGNOS, and MSAS, the authors present expected future performance, including the benefits of GPS L5. They evaluate the impact of the Indian GAGAN and Russian SDCM systems on global coverage and examine southward expansions for the original three SBASs. Finally, a look at the impact of a second constellation of navigation satellites and the performance for a user taking advantage of two core constellations.</h4><p> </p><p>The Wide Area Augmentation System (WAAS) monitors GPS and provides both differential corrections to improve accuracy and associated confidence bounds to assure integrity. The first satellite-based augmentation system (SBAS), it was commissioned for service in 2003. Japan’s MTSAT-based Satellite Augmentation System (MSAS) was commissioned in 2007, and the European Geostationary Navigation Overlay Service (EGNOS) was declared operational in 2009, with safety-of-life service commissioning expected in mid-2010. Two other SBASs are in the developmental stage: India’s GPS Aided Geo Augmented Navigation (GAGAN) and Russia’s System for Differential Corrections and Monitoring (SDCM) have fielded equipment and plan to become operational in the next few years.</p><p>Coming improvements will expand SBAS coverage areas and strengthen their performance. In the near term, these include more monitoring stations and algorithmic enhancements, with incorporation of a second civil signal in a protected aeronautical band and new GNSS constellations in the long term.</p><p>An SBAS utilizes a network of precisely surveyed reference receivers, located throughout its coverage region. The information gathered from these reference stations monitors the GNSS satellites and their propagation environment in real time. Availability of SBAS service is a function of two quantities: the arrangement of the pseudorange measurements used to determine the user’s position, referred to as geometry; and the quality of each individual measurement, referred to as the confidence bound. Although very small confidence bounds can make up for poor geometries, and strong geometries can overcome large confidence bounds, both values are generally required to be good to obtain high availability.</p><p>Geometry is determined purely by the locations of the ranging satellites relative to the user. Currently the basic geometry is provided by the GPS constellation. Historically it has exceeded commitments, and there are currently 29 healthy satellites in orbit when only 21 are nominally guaranteed. However, as satellites are taken off-line in critical orbital slots, the quality of the geometry can degrade significantly. There could be short duration losses of service daily at some locations. Since the goal is to provide service more than 99.9 percent of the time, these outages can have a dramatic impact. WAAS currently mitigates this concern by adding geostationary satellites with a ranging function virtually identical to the GPS satellites. These satellites are always in view and improve the overall geometry, although they do not eliminate the problem completely.</p><p>The confidence bounds relate to the expected error sources on the range measurements. Currently three error sources are corrected via broadcast to the user: satellite clock error, satellite ephemeris error, and delay error due to propagation through the ionosphere. These error sources are described by two confidence bound terms: the user differential range error (UDRE) for the satellite errors, and the grid ionospheric vertical error (GIVE) for the ionospheric errors.</p><p>For single-frequency SBAS, this last error source is the most significant. Users may sample the ionosphere anywhere in the service volume, but the SBAS only has measurements from its reference station locations. Thus, there is always the possibility of undetected ionospheric disturbances. This leads to larger confidence bounding terms and lower availability.</p><p>The combination of geometry and confidence bounds yields the protection levels (PL). PLs are the real-time confidence bound on the user’s position error. To match aviation requirements these are broken into a vertical protection level (VPL) and a horizontal protection level (HPL). Each SBAS guarantees that the user’s actual position error will be smaller than these values 99.99999 percent of the time. The PLs are calculated in real-time using stored and broadcast information. They must be compared to the maximum allowed value for a desired operation. The upper bounds are called alert limits (AL) and they are fixed numbers whose values depend on the operation.</p><p>In this article we are interested in the localizer performance with vertical guidance (LPV)-200 approach with a VAL of 35 meters and HAL of 40 meters. Currently, LPV aviation approaches can only be accomplished with a WAAS GPS receiver. Performance of an LPV approach allows minimums as low as 200 feet above ground level before a missed approach must be executed. As of January 2010, there were 1,930 published WAAS LPVs, with plans to add 300 per year in the United States.</p><p>Because GPS and SBAS generally perform better at horizontal positioning than vertical, the requirement that the VPL be below the VAL is nearly always the limiting constraint for these operations.</p><h3>Methodology</h3><p>To determine the global availability and the effect of potential improvements, we used our Matlab Algorithm Availability Simulation Tool (MAAST). This tool uses almanac data to calculate the position of the satellites for each specified epoch. The almanac chosen for this study corresponds to the GPS almanac broadcast on April 8, 2009, when there were 30 healthy satellites. However, PRNs 25 and 32 were removed to simulate a condition with 28 healthy satellites. MAAST also implements the WAAS integrity algorithms to calculate the corresponding UDRE and GIVE values. Finally, it uses these values to implement the airborne algorithms specified in the minimum operational performance standards (MOPS) for SBAS. The MOPS specifies user algorithms for determining the protection levels. For these simulations, the VPL and HPL are calculated about every 5 minutes and every two and a half degrees across the globe.</p><p>MAAST does a good job of predicting WAAS behavior. It is less accurate when predicting other systems’ performance. EGNOS has developed its own monitoring receivers and integrity algorithms and has different criteria for assigning a satellite a particular UDRE value and assigning each ionospheric grid point’s (IGP’s) GIVE value. Nevertheless, both systems are designed to meet ICAO requirements for integrity, and their performance should be somewhat similar. In observing EGNOS coverage plots and comparing them to MAAST predictions, we do see differences. However, the size of the coverage region and approximate boundaries are reasonably close and provide an idea of performance if not an exact map.</p><p>The MSAS algorithms are based upon the same algorithms used in earlier versions of WAAS. Therefore, MAAST should be slightly more accurate in modeling its performance. GAGAN uses the same prime contractor as WAAS and therefore similar algorithms may be expected. Less is known about the intended SDCM algorithms and therefore the modeling of this system faces the largest uncertainty. Again, the MAAST predictions should be viewed as indicative rather than precise. Individual availability maps will not be completely correct, but relative performance improvements should be properly indicated.</p><h3>Current Systems Status</h3><p>Currently WAAS is in its full LPV-200 performance (FLP) phase. It consists of 20 WAAS reference stations (WRS) in the conterminous United States (CONUS), in addition to seven in Alaska, one in Hawaii, one in Puerto Rico, four in Canada, and five in Mexico for a total of 38. The station locations are shown as blue circles in Figure 1. There are three WAAS master stations (WMS) and two geostationary satellites (GEOs). The GEOs are the Intelsat Galaxy XV satellite at 1338 W and the Telesat ANIK F1R satellite at 1078 W.</p><h5><img alt="" src="http://www.gpsworld.com/files/gpsworld/nodes/2010/9606/W-1.png" width="480" height="374"/><br/>FIGURE 1. Existing SBAS reference networks, consisting of 38 reference stations for WAAS, 34 for EGNOS, and 8 for MSAS.</h5><p> </p></div>Raytheon Awarded Next-Generation Control Segment Contract (OCX)https://landsurveyorsunited.com/hubs/gpsprofessionals/forum/raytheon-awarded2010-02-26T10:59:09.000Z2010-02-26T10:59:09.000ZJimhttps://landsurveyorsunited.com/surveyors/Jim<div><p>At this rate of GPS developement we will need to stay informed on whos who and what is hype and what is practical to the surveying commnunity.</p><p> </p><p><a rel="nofollow" href="http://www.gpsworld.com/gnss-system/gps-modernization/news/raytheon-awarded-next-generation-control-segment-contract-ocx-960">http://www.gpsworld.com/gnss-system/gps-modernization/news/raytheon-awarded-next-generation-control-segment-contract-ocx-960</a></p></div>geoid09 in gfs format file so I can SD card from PChttps://landsurveyorsunited.com/hubs/gpsprofessionals/forum/geoid09-in-gfs-format-file-so2010-02-26T04:25:28.000Z2010-02-26T04:25:28.000ZGary Breischhttps://landsurveyorsunited.com/surveyors/GaryBreisch<div>I have the ProMark3 RTK (PM3R) and no one so far can seem to show me a way to take the geoid09.geo file and convert it to a gsf file (geoid separation file) for my unit.  Randy Black was nice enough several years ago to create me a gsf of geoid03 for about a 150 mile radius of Tulsa OK but I am confused now when I try to figure out how.  Nothing that Ashtech (formerly Magellan Pro) has explains how to do it and I am certain it can be done. <br />
<br />
I took the reduced area specific version in geo format and thought I could just change the name to gsf and it would work and be the same.  I even loaded it and told my units to use it.  I have not done RTK in a while so did not really get to test it.  But when I opened both files in notebook, the old file in gsf was readable in text format but the geo was in hieroglyphics (non-readable symbolic).<br />
<br />
 I suspect the reduce geo that I changed in extension name to gsf is not going to work.   Does anyone have a way to convert the file into a for sure usable format I can easily transfer using my SD like I am used to.  I hate to think of trying to cable transfer - always have a hard time getting those stupid com ports to work and never want to do a transfer that way again.<br />
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</div>The Trimble Juno - A must for serious GPS/GIShttps://landsurveyorsunited.com/hubs/gpsprofessionals/forum/the-trimble-juno-a-must-for2010-02-16T09:40:38.000Z2010-02-16T09:40:38.000ZJimhttps://landsurveyorsunited.com/surveyors/Jim<div><a rel="nofollow" href="http://www.trimble.com/mgis_juno_sc_3.shtml?WT.mc_id=gis000390">http://www.trimble.com/mgis_juno_sc_3.shtml?WT.mc_id=gis000390</a></div>Magellan Promark 500 or Trimble R6https://landsurveyorsunited.com/hubs/gpsprofessionals/forum/magellan-promark-500-or2010-01-05T12:54:37.000Z2010-01-05T12:54:37.000ZBen Neveuhttps://landsurveyorsunited.com/surveyors/BenNeveu<div>For a new purchase, what would be your choice between a Magellan ProMark 500 or Trimble R6 ?All for use with VRS network.Does one of you has tested both ?</div>gps levelshttps://landsurveyorsunited.com/hubs/gpsprofessionals/forum/gps-levels2009-11-16T17:23:28.000Z2009-11-16T17:23:28.000Zronnie r. monilla RCE,JGE,CSPhttps://landsurveyorsunited.com/surveyors/ronniermonilla<div>thank you guys, i observed that if i work within the "box" (upper and lower limits has accurate levels by nak2 or any other means) and i used these for localization regardless of position i get milimeter differentials from nak2 elevations within the "box" but when i started to go forward out the elevations got berserk.... i really love to be with this group hope someday i can share some that is usable by the group. God bless to all...</div>Spectra's new Epoch 35 GNSS receiver with Field Surveyor Softwarehttps://landsurveyorsunited.com/hubs/gpsprofessionals/forum/spectras-new-epoch-35-gnss2009-11-04T15:10:29.000Z2009-11-04T15:10:29.000ZAntonie Krugerhttps://landsurveyorsunited.com/surveyors/AntonieKruger<div>Hi Guys, I recently purchased this GPS system to replace a Topcon Hyper Pro system that failed completely (4 years- :-( ). I am very impressed with the system. It is well priced and it is quite easy to set up. I have not used the system with an NTRIP caster since our cell networks are a little dodgy and you can not really rely on continuous error corrections from the NTRIP base - but that a discussion for another time. My current issue is that the field surveyor software that sprectra sells with the Epoch is not so friendly. I can understand that it is a young system and that there is still a lot that needs to be done; I think one of Trimble's earlier slogans for the survey controller was - adding value to GPS. That’s exactly it - if the software is inferior, the receiver will be judged under the same umbrella. Now, my main points of concern are that the DTM and roading formats completely proprietary and need to be input on the controller. Now we’ve created a company policy some time ago that no data input would be done on a controller – we identified this as a major source of blunders. Now I have this extremely expensive topo and point placing device. I’ve had a whine at Spectra to supply me the data formats (a *.DTM for the dtm’s) and (a *.RD5 for the roads), but this has fallen on deaf ears. Is there anyone out there that has found a way of getting design formats (XML) into a format that this controller can work with?</div>Data Link for your GNSS Systemhttps://landsurveyorsunited.com/hubs/gpsprofessionals/forum/data-link-for-your-gnss-system2009-11-02T20:47:36.000Z2009-11-02T20:47:36.000ZJimhttps://landsurveyorsunited.com/surveyors/Jim<div>Is the <i>CELL</i> Phone really the Achilles Heel of your GNSS Geo Station?Unfortunately, there is no magic solution. Your coverage is limited by the service provider that you have chosen to use. In speaking with some infrastructure people at Trimble, their recommendation to end users is to go with the provider in your area that provides the best 3G coverage.Just a quick note, it is important for you the user to realize that just because you are in a location where you can use your cell phone to place and receive calls, that does not guarantee that you have data coverage in that same location. Some cell towers are for voice only coverage and while others provide coverage for both voice and data.Sorry at this point I could not provide you more insight into this issue that you are seeing with regards to the limits of your cellular coverage, but please understand that these issues are beyond the control of your Geostation manufacturer.I can only say that I have tried many services and I have found that Verizons VX8300 and it upgrade VX 8360 are without question very good I have been in many regions across our state and the dissconnect has been little to none existen.</div>Great resource for understanding GPS Historyhttps://landsurveyorsunited.com/hubs/gpsprofessionals/forum/great-resource-for2009-09-12T10:57:06.000Z2009-09-12T10:57:06.000ZJimhttps://landsurveyorsunited.com/surveyors/Jim<div><a rel="nofollow" href="http://en.wikipedia.org/wiki/Global_Positioning_System">http://en.wikipedia.org/wiki/Global_Positioning_System</a><b>The Satellite Navigational Constellation world is growing fast!</b>US Global Positioning System <b>(GPS)</b> at 32 satellitesRussian <b>GLONASS</b> at 19 satellites <a rel="nofollow" href="http://www.glonass-ianc.rsa.ru/pls/htmldb/f?p=202:20:14637162736231801312::NO">http://www.glonass-ianc.rsa.ru/pls/htmldb/f?p=202:20:14637162736231801312::NO</a>European <b>Galileo</b> Constellation at full operation will have 30 satellites <a rel="nofollow" href="http://www.esa.int/esaNA/ESAAZZ6708D_galileo_0.html">http://www.esa.int/esaNA/ESAAZZ6708D_galileo_0.html</a>Chinese <b>BEIDOU/COMPASS</b> will have 10 satellites by 2010 <a rel="nofollow" href="http://www.insidegnss.com/node/924#Baseband_Technologies_Inc_">http://www.insidegnss.com/node/924#Baseband_Technologies_Inc_</a>Japanese <b>Quasi-Zenith</b> Satellite System <a rel="nofollow" href="http://sciencelinks.jp/j-east/article/200413/000020041304A0368467.php">http://sciencelinks.jp/j-east/article/200413/000020041304A0368467.php</a>Indian Regional Navigation Satellite System <b>(IRNSS)</b> as well as the augmentation systems. <a rel="nofollow" href="http://www.gisdevelopment.net/news/viewn.asp?id=GIS:N_wabucgyfeo">http://www.gisdevelopment.net/news/viewn.asp?id=GIS:N_wabucgyfeo</a></div>To all NYSNet CORS usershttps://landsurveyorsunited.com/hubs/gpsprofessionals/forum/to-all-nysnet-cors-users2009-09-10T11:40:38.000Z2009-09-10T11:40:38.000ZJimhttps://landsurveyorsunited.com/surveyors/Jim<div>To all NYSNet CORS users:We have two Real Time Network outages to announce. On Tuesday, September 15, 2009, from 7:00 pm to 10:00 pm EDT there will be an outage affecting all NYSDOT Web-based applications so that our IT division can install new hardware. Users will not be able to access the Real Time Network or the NYSNet web site (www6.nysdot.gov/spiderweb) during this outage. The NYSDOT.gov web site will be operating but some applications such as the Geodetic Control Viewer and 511NY will not be available. Static data from the NYSNet CORS will continue to be logged on the CORS receivers at each site and will be downloaded to the RTN servers after network connectivity is restored. We anticipate that real time data will be available immediately after the servers are restarted, but problems could arise which may result in RTN outages on Wednesday morning, September 16 also.On Wednesday, September 16, 2009, beginning at 6:00 pm EDT our IT division will be installing software updates which will require a restart of the servers. This interruption should last anywhere from 5 to 30 minutes.</div>USCG Nav Center Issues High Horizontal Dilution of Precision AdvisorySeptember 9, 2009https://landsurveyorsunited.com/hubs/gpsprofessionals/forum/uscg-nav-center-issues-high2009-09-10T11:34:45.000Z2009-09-10T11:34:45.000ZJimhttps://landsurveyorsunited.com/surveyors/Jim<div>USCG Nav Center Issues High Horizontal Dilution of Precision AdvisorySeptember 9, 2009--------------------------------------------------------------------------------GPS may be unreliable in certain parts of the world for short periods on September 11 as a result of a routine Delta-V maneuver with satellite #52 (PRN-31).The Navigation Information Service of the U.S. Coast Guard Navigation Center issued a High Horizontal Dilution of Precision (HDOP) Advisory, reporting that GPS users may experience a temporary degradation in GPS reception in parts of the southwest and central United States from 13:02 UTC to 13:23 UTC on September 11.The following areas in the United States may be affected:Southern NebraskaKansasOklahomaSouthwestern ArkansasEastern TexasWestern Louisiana</div>UTM to Lat and Long or Lathttps://landsurveyorsunited.com/hubs/gpsprofessionals/forum/utm-to-lat-and-long-or-lat2009-07-06T02:27:37.000Z2009-07-06T02:27:37.000ZJimhttps://landsurveyorsunited.com/surveyors/Jim<div>I went to gogle earth keyed in the Northing and easting into the push marker and it converted them for me. Plus it showed me exactly where the point of interest was on the image of the area I am surveying.Thanks</div>