Issues during testing connection between 3 Rovers and 1 Base

GPS/GNSS Development Boards
1

Hello all,

We are testing the connection between 3 rovers (ZED-F9R) and one base ( ZED-F9P), each rover and base have the latest firmware version. It was configured to run the test for 3 days and it was considered that each day a log would be created (Max log time= 10080 minutes and Max log length =1440 minutes). The base sent corrections to the rovers and an accuracy of 14 mm was achieved (See figure attached), however, it was inconsistent for 2 rovers of the 3 tested:

  • Only 1 rover had a constant RTK fixed mode ( 14 mm).

  • In The rover that had RTK fixed Mode, the SD card stopped logging the data after 2 days and a half, although it was configured to log for a week. The two other rovers didn’t encounter the issue when I checked the configuration it was the same for the three rovers.

  • The radios stopped blinking the red light, which also indicated that the rovers didn’t have RTK Fixed mode ( We are using the SiK Telemetry Radio V3 - 915MHz, 100mW)

  • The displays of two rovers always showed that we have RTK fixed mode, however, that was incorrect as I mentioned before.

    • I was wondering if someone knows what could be the issue or issues to had the problems mentioned above during the test.

    Test.png
    Test.png695×579 132 KB

    2

    The SiK Telemetry Radios do not support multipoint broadcast, only point to point. Your Rovers will have intermittent RTCM leading to loss of RTK.

    3

    Hello @sparky,

    Thank you very much for your reply. Which radio do you recommend using instead?

    4

    At this time I don’t have a good recommendation for a multi-point radio.

    One workaround would be to get the base onto WiFi and broadcasting to NTRIP Caster (RTK2Go for example). All rovers could then use WiFi or Cellular to get RTCM corrections. NTRIP was designed for multi-point.