Two engine question

Phillip Lancaster

Active Member
"If this happen then our Rover will mark all absent signals by dark grey and disable them for selection. No reasons to calculate RTK if there are no differential data. If whole system is not available then whole BDS will not be allowed for selection".

If they are "absent" or greyed out. Why would they show when checking the gnss status button? Signal strength maybe?
 

Eugene Aksyonov

Well-Known Member
Thanks for that explanation, Eugene. There is an option to Reset Engines at Start. It seems to me like it might be good to have the option to Auto Setup at Start also. I've noticed that many times I will start a shot in the open, no canopy, and it will collect 10 epochs or less, and then it gets hung up until I press Auto Setup, then it quickly gets going collecting again. Probably the "best" signals have changed since the last time engines were setup.
Thanks for notice, John!
Let us get more feedback then I will add. Theoretically it should not be necessary to do on every start because constellation should not be changed that fast, but, probably it has different effect on RTK that improves fix. This is area of unknown bugs, most likely.
 

Eugene Aksyonov

Well-Known Member
"If this happen then our Rover will mark all absent signals by dark grey and disable them for selection. No reasons to calculate RTK if there are no differential data. If whole system is not available then whole BDS will not be allowed for selection".

If they are "absent" or greyed out. Why would they show when checking the gnss status button? Signal strength maybe?
GNSS Status shows your Rover's configuration. It doesn't care about Base because this is general status of this device. It is possible to watch this status on Base in "Base/Rover Setup" also but works completely for Ttiumph-3 only yet.
Greyed Out signals you can see if Rover receives enabled signals but Base doesn't transmit them. If you turn off system or signals on Rover you will not even see the signals bars on the screen. In this case You may get into situation when Rover limit itself to use them in RTK even if base corrections contain this signals. So keep your eye on the signals and systems you track.
 

Mark Wheeler

Active Member
Eugene,
I went to a job site and tried using the state RTN with 2 engine and 5 engine (4 constellation). When I started up GPS, Glonas and Galileo were selected. Bedoi was greyed out. Looking at the health of sats over 20 minutes, Bedoi was between 9 8 8 7 and 10 9 8 7, while the three constellations selected by Jfield were mostly 6's with some 4's, 5's and 7's. The explanation you gave above made sense, but in this scenario Bedoi was the top dog across the board and yet could not be selected. I tried restarting the LS, but had the same results. I have had other times where BDO was in the the RTN loop, but not in the last week. I ended up setting up the T2 and it used limited Sats from all 4 systems.
Mark
 

Mark Wheeler

Active Member
LS on State RTN: With "System Based" strategy and "No Same Frequency" it still appears that Engine 1 and 2 are duplicating the signals used based on the general engine charts listing the constellations and letters selected. Changing to "All the Best" or "System Based" is giving this same result. Possibly the constellation letters in the chart may include different signals. But I cannot tell.
I am also trying to better understand why in the GNSS Status box BDO can be ranked best across the board in the LS rover, but is usually greyed out when using the State RTN. I say usually since every once in awhile BDO is included. Is there something in the GNSS Status "More" charts that can clue me in to what is happening? and what the color coding means? When sufficient differential BDO data is available? If it never worked I would assume the State RTN is not broadcasting BDO in a format that the LS is looking for...but occassionally it works great. Let me know if you have any solutions. Bottom line is I am trying to get Engine 1 & 2 to use different Sat groupings based on what is in the sky and to fully enable BDO (when possible) and better understand if there is an issue with the state RTN or just that is how things are.
Mark
 

Mark Wheeler

Active Member
Matt, All the BDO is dark greyed out and cannot be selected. They work occassionally, or have worked occassionally. I tried nearest base (versus normal network) setup and one BDU came in. Switched back to network setup and BDO was greyed out.

Shawn, All the stations in the State network are Beidou enabled. From my driveway BDO has worked great a few times, for most attempts they are Dark greyed out. Does not seem to be a correlation with Signal status...ie. BDO may have the best signals accross the board, but remain unselectable.
 

Adam

Well-Known Member
5PLS
Shawn's right. I worked this week where I had bdu for the first time in a while on the rtn. Around the house I don't get bdu on the rtn.
 

Eugene Aksyonov

Well-Known Member
Mark, certainly we have a deal with RTN correction issue and need to debug it somehow.
But want to give you a hint how to watch the RTN correction state. Look at this picture that I cut from the initially posted into the thread
1600896003641.png

What it is saying is that RTN base does broadcasting C/A and reports measurements from 7 sat sources, but doesn't broadcast P1 at all and that is the reason of why it is dark greyed out and no "digit" appears from the right of "6". So if you see next situation when Beidou (BDS) looks like
1600895983373.png

It means that your local Rover is receiving 8 good BDS sats who broadcasting B2A and B2B but none of this signals are present in corrections from Base(RTN Base).
OR, I can't exclude, there are overloaded data link that provides corrections over internet and we receive most correction but some data was cut or lost on the way to Rover. Here I would try to switch between WiFi and Cellular connections when no BDS system is received in corrections.
 

Eugene Aksyonov

Well-Known Member
Probably would be good if you record a point with data for a few minutes when BDS is out but you believe RTN is broadcasting it. So we can analyze the data and check if BDS corrections were present.
 

Mark Wheeler

Active Member
Eugene, When I turned unit on (network RTN MSM4), 1 BDU signal showed as a Red X, then all BDS dark greyed out. Based on wed 5:46 post, BDS signals were not being transmitted from network Base and Received at Rover. Point 3 was such (BDU not included). Point 19 was from State Nearest Mountpoint, where two BDS signals registered 1 BDS sat and 3 BDS sats. They were light grey selectable and the 3 Sat BDS was used in the 2 engine solution. Changine back to Network mount point all BDS were dark greyed out and no BDS Sats were indicated in the digit to the right of the RTK received Sats. For the most part the two engine solution used the same picks in each engine with "System Based Strategy". For this test the "Nearest Mountpoint" works, the MSM4 network excludes BDU altogether and appears to use the same picks in each engine.
 

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