Sub centimeter accuracy using F9P

Ground Control Software Mission Planner
1

Hello guys,

can anyone help with some issue regarding F9P?

i am using the simpleTRK2b as a base and simpleRTK2b + simpleRTK2blite as a rover and moving baseline.

i managed to get a 0.05 accuracy of RTK in the Mission Planner, but the HDOP is 0.52 and won’t get lower than that. i’m excpecting to get HDOP of 0.10 at least with the accuracy i got using the RTK.

hope someone can shed some light on this issue.

Thank you,
Nick

2

Please read more about hdop on wikipedia or something like that. hdop does not directly translate to accuracy.

The accuracy is measured by the gps_xy_accuracy value, not by the hdop value.

3

Thank you very much for your help!

4

If you are chasing ‘sub-centimeter accuracy’ with Ardupilot using any GNSS module at all, you should know that the internal resolution of the location is already larger than 1 centimeter. This limits the location accuracy regardless of the input. Chasing better accuracy

5

where can I see this value? is it in the Mission Planner?

6

Dataflash logs GPSA.XAcc or GPSA.AccX or something like that.
You sould also get some values using Mavlink telemetry, but only for GPS2 and only if you use mavlink2.