Comments: Setting up a Rover Base RTK System


Looking for answers to technical questions?

We welcome your comments and suggestions below. However, if you are looking for solutions to technical questions please see our Technical Assistance page.

  • Member #1708539 / about a year ago / 2

    How would you set this up with a single base and multiple rovers?

    • I recommend setting up a base that is connected to the internet, then have multiple rovers all getting their RTCM data over cellular and transmitting it to the roving ZED-F9x via Bluetooth.

      • Member #1708539 / last year / 1

        What would you do if you were in a situation where a cellular connection is not possible? (very poor reception, using phone/tablet as the handheld device that doesn't have network service). Is it possible to have the radio link work with mutliple receivers?

        • Nate / last year / 1

          There are a variety of serial radio modem options available. Some modems are point to point and have a confirmation packet that the remote transmits back to the transmitter. Others are just blind broadcasters. Pick a radio that is just broadcast and you should be able to transmit from one to many.

  • xsk8rat / about 2 years ago / 2

    Maybe add a wish list populated with the recommended HW please.

    That would be awesome!


  • Member #339879 / about 4 months ago / 1

    Hi Nate! As predicted, I came back for another set of gear, plus radios, so now I have full remote RTK capability! I would like to understand how to resolve a problem I have, though. My property is out of cell coverage, and I can't leave equipment there (like a reference station - no power). I'd like to go back every so often and have repeatable results - when I take down my temporary Base and re-establish it the next time, the survey-in is still not terribly accurate (nor precise), and I'd like to fix that issue. Is there a way to establish a known location (like create a little survey monument that won't get disturbed), locate it accurately (if I'm doing the PPP technique, can I save the *.ubx file to the SD card? Can't leave a laptop there, but I do have a battery pack that can plug in to the RTK Surveyor to keep it going for a day or two), then set up over it next time, and have it understand that it is at a fixed location and broadcast RTCM corrections using that known location as a reference? The last bit I can do from your other tutorial - it's really how to collect that data for 24hrs in a remote spot that is something I am having trouble envisioning... Any guidance? Thanks, Neil.

    • How much accuracy, horizontal and vertical, do you need? Horizontal is pretty easy, vertical is an extra step.

      If you need relative accuracy, I would hammer something into the ground, locate a tripod with a string+nut above the spot and do a Survey-in. Record these coordinates. Now every time you return to the spot, enter the coordinates into a fixed base. Day after day, all your plots will be extremely, relatively, accurate to each other. Ie, your base might be a few feet off compared to the 'real world' but the distance from your base to the rover will be accurate to 14mm.

      If you need absolute accuracy, configure a rover for logging PPP messages. Set your unit over your monument and start it up. Let it sit for 6 or more hours. Take your PPP log data and send it through CSRS to obtain the absolute location of your monument. Next time you return to your monument, set your unit for fixed base, enter your CSRS obtained coordinates and your rover will have absolute accuracy.

      The problem with both of these setups is antenna height. If you want really accurate readings (with either setup) you'll need to make sure your antenna's height off the ground is the same every time. This is very tricky with tripods as the legs can adjust and sink into the ground. Using a tape measure or sting can help reduce this variable.

      • Member #339879 / about 3 months ago / 1

        Thanks Nate! I appreciate the quick and insightful response! I think I have a way of ensuring vertical accuracy in an absolute scenario, at least to a couple of millimeters, which should be 'good enough' for my purposes (remembering that "perfection is the enemy of good").

  • Member #823597 / about 4 months ago / 1

    I am having a lot of fun skill building and learning how to configure the ZED-F9P with the ESP32.

    I would like like to use the ESP32 to receive the RTCM corrections from the ZED-F9P through the UART2 port and deliver them via Bluetooth to a NTRIP Client. I get the physical layers, devices and connections however my programming skills are not my strongest point and I am wondering if anyone point me in the right direction?

  • Member #1679834 / about 11 months ago / 1

    Our group wants to read the GPS message on the Linux system by using the USB connection. Should we change the Port target to be the 3-USB? Or are there any tutorials about these we can follow? Thanks!

  • Member #712217 / last year / 1

    Thanks for writing up this tutorial!

If you've found a bug or have other constructive feedback for our tutorial authors, please send us your feedback!