I am using the pitch angle to feed my controller. I observed the Pitch output deviates with time. if I place my GP9 on stationary position the pitch output deviates with time (about 5 degrees in 5 minutes). How can I get a stable output. Thank you
On the GP9, angle outputs can wander as gyro biases changes over temperature (this happens less with units that are calibrated over temperature). The built-in gyro bias estimator compensates for those changing biases, so that the angle estimates are stable over time.
In order for gyro bias compensation to work, you need either
1) a good stable GPS lock, or
2) no GPS, but with accelerometer updates enabled.
It’s worth noting as well that the GP9 performs best when it is moving outside with GPS lock, not when it is sitting still indoors on a table.
