An issue I have with M2 is that it doesn’t work very well over long baselines >10-15km. The fixed solution is always off a random number 10-20-30cm compared to my main rover (Hemishpere based chip). I have seen this numerous times and I don’t understand why this happens. Maybe the Harxon antenna I use? I don’t know. Over small baselines <10km the fixed solutions match every time.
Anyway as another user mentioned, I would like to see improvements in the accuracy and repeatability of the receiver.
Hi @vgo195,
Could you please share the coordinates of the points collected from both Reach M2 and your main rover, along with the coordinate system you use?
Shorter baselines usually provide more consistent results. But let’s still check what’s going on with the accuracy in your case.
How is it used in your setup?
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My personal experience with the a similar setup (M2+GPS1000 antenna vs E-Survey E200 (Hemisphere P20 based)) showed a slight advantage to the M2, but both were within 1 cm of the reference.
Do you get a fix at all?
Can you maybe post a ubx raw file for analysis?
I have M2+GPS500 antenna and I compare with e-Survey E300 receiver.
E300 is constant in the same point but M2 is not.
I am always talking about fixed solutions on baselines >10-15km.
Right now I am busy and cannot post raw files but in general the M2+GPS500 raw files are of good quality.
Hi @vgo195,
I see. I’d like to help you figure out why your Reach M2 behaves like that. It should also work with this Harxon antenna, so there must be something else causing these differences in the coordinates.
To investigate, I’ll need some additional information. Whenever you have time for it, please share the following logs from M2 after configuring it for RTK. If possible, please record the logs on a point with already known coordinates so that we can use them as a reference.
- UBX raw data log
- Base correction log in RTCM3 format
- Position log in LLH format
Besides, do you use your own base station or an NTRIP service? Did you use the same base for both receivers? Please also attach the results of collecting the same point with your main rover so that I can compare them.
You can also email these files to support@emlid.com. Thanks!
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