Land Surveyor Forum

Replies

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  Javier June 10, 2015 at 10:25am

  All your statements are true.
  if you need more specific details let me know.
  • 

    Land Surveyor > Javier June 11, 2015 at 4:25am

    Thank you for the confirmation. I think its good enough to put in my ppt
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  cut fill June 8, 2015 at 7:10pm

  NTRIP and other internet protocols are the tapes rods, and transits of the modern surveyor. Great post and comments.
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  [email protected] June 8, 2015 at 3:37pm

  The GSM cell phone connection from rover to base has become a thing of the past as cell phone companies have dropped support for this kind of connection.

  The NTRIP connection is a viable alternative.  It is often used when a variety of base station data is fed to a single IP address and mount points for those base stations are on a list of available base stations.  Some NTRIP servers have a single mount point.

  For some there is also the Direct IP or what may also be called a Static IP base station.  The latter is rather easy for a small time user to configure using a computer back at the office as the RTK relay.  There is freeware called GNSS Surfer that will manage the relay with input from a single base station and connections to multiple rovers all connecting to a single IP address.

  I do not know what the limit may be on the number of rovers able to make the connection to the base station.  The most ever connected to my RTK relay was 15 rovers.

  There is a real advantage to this type of connection because the base station can be in close proximity to the rover for a fast RTK solution and enhanced accuracy.

  Data collectors with a WIFI connection can use the WIFI in the cell phone to make the internet connection.

  A disadvantage is this may require you to have a data collector and cell phone with the base station for the base connection to work.  The connection from the base station might also be managed by using a small netbook computer running GNSS Surfer.  The data from the base could be sent via serial cable to the computer.  The computer then relays the base station data to the RTK relay at the office that will accept Direct IP connections from both base and rover.

  Could the base station feed data back to the relay using one of the modern tablet computers?  I really do not know the answer to this question because I never tried it.  I have also heard of serial to Bluetooth devices that might allow the connection to a computer that does not have a serial port.

  One of the biggest limitations we face is our imagination.  I am often fascinated by the things people do to solve connection problems.
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    Land Surveyor > [email protected] June 9, 2015 at 9:31am

    1st of all, even gsm is the past, I did compare it because a lot of surveyor in my place still used gsm by the built in modem in  topcon gr5 and few other ashtech model. They used gsm instead of ntrip data.

    I agreed direct ip is rather easy for a small time user. Regarding the NTRIP disadvantage in spending for data collector and  cell phone or computer with internet connection at base station location, I can give one suggestion. We can use a device so call as TCP server. The popular one is Moxa Nport. It has 1 or more serial port to connect to receiver RS232 and an RJ45 to connect to LAN switch or direct to portable TPlink router.

    This device can be set as TCP client so that it will output correction to TCP server on server computer at office(server computer need accessible public IP). In the server computer, I did used BKG NTRIP Server to forward it to NTRIP CASTER program. 

    As a result, rover can have the correction in NTRIP protocol. We enjoy this without any laptop/tablet/netbook to send the correction to IP. All those thing was power up using a usb powerbank in convinience way. If you feel that moxa nport is slightly expensive, you can use USR IOT TCP SERVER T24 which you can get it around 20$.
• Survey Legend

  ⚡Survenator⌁ June 8, 2015 at 2:43pm

  There are actually more NTRIP conversations thank I thought

  site:landsurveyorsunited.com NTRIP - Google Search
• Survey Legend

  ⚡Survenator⌁ June 8, 2015 at 2:38pm

  DId you see this discussion