Hello!
My home ref. station is Trimble NetR9- Ti-1 and i need a little help or experience sharing about settings in RTCM 3.3 (MSM) options.
In the field, with rover (Trimble R6-4) I noticed, that after getting corrections from base station, Beidou satellites are reduced only to 2 Sv's (normally in autonomous solution, they are 8-10 Sv's).
The war in Ukraine makes Glonass not stabile and predictable- at least here in Balkans, so I'm looking for way to increase Beidou performance. Is it matter of settings or just Beidou works that way?
Below are my Ntrip Caster Setting- RTCM 3.3 MSM 7 . Would be thankful for any suggestions.
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https://trl.trimble.com/docushare/dsweb/Get/Document-732678/NetR9_UserGuide_English.pdf
https://trl.trimble.com/docushare/dsweb/Get/Document-666216/R8-R6-R4_v480A_UserGuide.pdf
The Trimble R6-4 literature shows that some of the satellite tracking is optional across the different constellations. It could be that you don't have everything enabled on the rover.
Also, it's usually best practice when using all Trimble gear to use the CMRx message format.
And if you do stick with MSM, you may want to enable the gps/glo records, and drop down to MSM4. MSM7 is pretty dense and contains a lot of information. Not sure if the R6-4 is set up with enough bandwidth to handle that.
Thank you very much! CMRx is really interesting idea, witch frankly say - i miss! I supposed that it's like older- CMR+ supports only GPS and GLO, but sow how wrong i was. I'll try it!
Everything enabled on rover- i used correction from local network provider via VRS. But after war VRS is not option.
Also I'll try MSM4 instead MSM7. Very, very helpful advises.
Does the Trimble NetR9- Ti-1 track B3? (I don't have one here to log into, so I can't check.) If not, you are going to be B1 only on BeiDou SV's 14 and higher, as the high numbered BeiDou SV's don't have B2, only B3.
If you follow this all the way through, the high numbered SV's will be used for fine positioning with B1 only, however Trimble will not list them as 'In Use' as no second frequency is available for integer resolution.
Either CMRx or RTCM3.3 should be find. I would think that MSM4 would be just as good as MSM7, however if your transport is over cellular, there may be no reason to not use MSM7. Some Trimble documents have implied that RTCM3.3 is better for extended constellations, however I have found the CMRx and the OEM version sCMRx are just as good with a much smaller payload.
@mark-silver?ÿ
Thank you Mark! I thing NetR9-Ti1, tracks B3 as we can see bellow. But it's a good point, since it is not sure that each of visible Beidou SV's can participate in RTK solution for some other technical or military reasons. I just want to clear one by one possible reasons for that and start from protocols.
It's a perfect that we have agreement about MSM4 and CMRx. Tomorrow i will check them to see how they work. But I'm completely sure- after your experience and advises I'll use CMRx. And for some friends without Trimble rovers,I will keep Ntrip Caster with RTCM3.3 MSM4.
Really thank you very much!
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In the field, with rover (Trimble R6-4) I noticed, that after getting corrections from base station, Beidou satellites are reduced only to 2 Sv's (normally in autonomous solution, they are 8-10 Sv's).
This description clearly indicates that some of the satellites signals are not included in broadcasted corrections messages so your rover is unable to use them in RTK despite it can track them.
You should definitely switch to CMRx if used with Trimble equipment as according to this table looks like that NetR9 RTCM 3 MSM encoder even in the newest FW does not support BeiDou BDS3 B1C and BeiDou B2A.
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Maybe you would need also the lates FW upgrade for both devices to the newest version as GNSS manufacturers still polish full BeiDou support.
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