You can remove the drift only by referensing the gimbal to outer frame, but then the gimbal will follow if the outer frame will move or by external heading reference that does not drift.
The gimbal IMU, frame or camera will alway drift. How much depends of how well is it calibrated.
external heading reference that does not drift is the only way to remove it. the result just depends how good external reference you have. Typically such reference is compination of GPS, IMU, Compass and calculation, i.e flight controller or something similar. Ideally proper INS, but they are big and expensive.
sorry if im stubborn, but the frame imu is not a external reference? if I have the main imu in the cameras, and the frame imu over the yaw, this last one is not a external reference ??
The IMU by its nature will drift. How much it drifts and to what direction is IMU and calibration dependant and temperature and many more factors. How does it help that you have a frame IMU that drifts?
To remove drifting, you need a reference that does not drift.
Thanks Garug. Look this next picture, is the Arris Gimbal I bought, its pluged more than 15 minutes and the yaw is steady. Just pluged to the power. The grey box on the right is to check if the gimbal has move or not.
a single GPS alone will not work on drones. On car it is ok, but not great. This is as car goes always where the wheels point, but drone goes sideways.