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I am wanting to build a device with gyro, accellero, gauss (compass) sensors and barometric sensor.
This device will record all data from the sensors over a period of about 15 minutes where a person is in freefall (jumped from an airplane).
Fall velocity is easy, using the barometer, but I am not sure about the angle.
I want to know the absolute angle along all axises of the person. Due to the acceleration after the jump, decceleration after opening of parachute and (de/a)cceleration due to change in position in freefall and therefore air resistance all the accelerometer forces will constantly change among all axises.
How would I be able to calculate the absolute angle/rotation of the person in 3 dimensions (roll/pitch/yaw).
Right before the jump, the person is in an airplane and full of adrenaline. Because of this combined with tight space and high noise from the engines, I want to prevent having to use calibration on forehand where possible.