Just an update, still not solution though. I am posting this in the hope that it helps the Developers identify any issues with the 3.3 code that may be causing this. I am flying fine with 3.2.1 and will continue to do so, I just thought that the Dev community would like to know if there are still issues running 3.3 on various boards.
I have done
1: complete recalibrations,
2: Disassembled my machines and tried running them with minimal electronics running,
3: loaded custom code to test while connected to USB (So no RF transmitter/receiver interference would be encountered)
4: Swapped out all GPS/Compass cabling
5: Changed GPS modules (although they are all the same 3DR model)
6: Reloaded GPS config from GITHUB 3DR GPS config file in the libraries folders
I have been hacking my way through the code and can narrow down the issue to the position estimates but I am not sure what is failing.
I notice that all of my logs show a flat line for EKF2>Ratio and the horizontal position estimates and readings also show flat lined values.
I had 3DR support look at my 3.2.1 logs and as far as they can see there is no hardware error. So that’s good!
I still get the EKF Variance (EKF_CHECK-2) on all of the following machines:
3DR Y6B running Pixhawk-v2, 3DR ESC & Motors, 3DR uBlox-6 series GPS/Compass.
Cinetank Mk-2 with Pixhawk-v2, T-Motor ESC’s and motors, 3DR GPS/Compass
FPV250, with Pixhawk-v2, Afro ESC’s, Multistar motors.
All of them do exactly the same thing which is to immediately switch into EKF Failsafe as soon as I arm. (With or without GPS lock).
Something has been bothering me though, with no lock my GPS will report it’s position as the last place it had a 3D Fix. Is that normal and will the non moving, fixed GPS position fight against the EKF even though it does not have a 3D fix?
Thanks and I know that this will be low on the priority list but I hope it helps. I can see that the work on 3.3 has some great stuff and I can’t wait to try the release version (as long as I can get it to work on my machines).
Here is a log from a short 3.3-rc7 hover flight. All flight control parameters are at default.
dropbox.com/s/4x3zdkxeo5yal … 4.bin?dl=0