No RTK Fix (Again ;( )

Q&A forumCategory: QuestionsNo RTK Fix (Again ;( )
beatified asked 2 months ago

I have a SimpleRTK2B LR Kit and the magnetic puck antenna’s.
 
So I posted the same issue before but this time its a little different.
So I load the base config that enables Survey-in and although I have decent antenna placement I get nothing it just sits in 3d forever.
If I set TMODE3 to FIXED and set the coordinates manually again I get nothing (Although this is what worked 1 time and never since.)
So then I checked out UBlox github instructions on Survey-in and I can repeatedly get to a TIME status using their instructions.
The problem I have with that method is that my XBee LR Radio doesn’t work after having preformed their instructions.
So to get the XBee radio to work again I load the base config and although the XBee radio starts working I loose TIME and it goes to 3D.
 
Is there a reliable set of steps to get a base working? I really don’t think my antenna is an issue but I am having a huge issue getting the base setup.
 
Thanks,
Stuart

Ardusimple Staff replied 2 months ago

Dear Beatified,
If you load the configuration files in our website (making sure you follow the steps described), it will work after a few minutes of survey. It is important to have clear visibility of the sky.

beatified replied 2 months ago

I followed the instruction but it doesn’t work.

Ardusimple Staff replied 2 months ago

Can you detail what doesn’t work?
1. Does the base station get into TIME mode? If yes, continue to 2.
2. Does the rover receive RTCM corrections? You can check this with ubx-rxm-rtcm.

clive1 replied 2 months ago

Check progress of SURVEY-IN using UBX-NAV-SVIN
Make sure the baud rate for UART2 matches those settings for the XBee radio. Use UBX-CFG-PRT to confirm/check the settings, UART2 only needs to in/output RTCM3
Enable the RTCM3 messages 1005, 1077, 1087, 1097, 1230 on the Base, confirm you receive them on the Rover
I’d recommend not running scripts but rather understand the underlying requirements, these are not inherently complicated, but need to all align correctly and be working end-to-end for the desired results to be achieved.

beatified replied 2 months ago

Ok hopefully this make it clear what kind of problems I’m having. Just keep in mind that when I do get a time fix I no longer have Xbee LR Radio.

https://youtu.be/taL98I1wh_Q

Thanks Clive and I will look into seeing whats going on and checking the survey-in process.

clive1 replied 2 months ago

Need to enable UBX-NAV-PVT and UBX-NAV-SVIN to actually SEE what’s happening with the Survey, and to report TIME, and HDOP/VDOP

beatified replied 2 months ago

Ok I got a time fix on the Base but dont see any data coming into the rover and it is not reflecting anything other than a 3d fix.

beatified replied 2 months ago

Ok So it really helps when you have the rover config on the rover and not the base config. I now have 3d Float. I am guessing my accuracy is very bad because the rover is in a horrible position????

clive1 replied 2 months ago

Then you’re going to need to figure out where the discontinuity in the ZED vs XBEE settings are.
Need to ensure that the RTCM3 messages are being output by the BASE.
That the XBEE to XBEE comms link is working.
That the ROVER sees the data at the far end.

clive1 replied 2 months ago

Do a survey that takes more than 2 minutes, and gets accuracy below 1m

Move the rover to a place where it has a good chance of seeing 8 to 10 satellites.

beatified replied 2 months ago

BTW I had sent the proper settings to the rover before. But just to clearify what is it that fixed this because as far as I can tell all I didn’t do anything thing but monitor the messages??? Or maybe my config was wrong for the rover but the proper led was blinking (Xbee -> GPS)

beatified replied 2 months ago

Trying a 600 second and .75 meter but monitoring it to see what happens and if that is achievable in a short period of time other wise I’ll do a 12 hour period or something and see how good I can get it.

Thanks a ton for all your help.