Experimental Validation1

A priori information given by the complete modeling of the ballistic behavior (trajectory, attitude) of a projectile is simplified to give a pertinent reduced evolution model. An Extended Kalman Filter (EKF) is designed to estimate three attitude angles from measurements of the magnetic field of the earth given by a three axis magnetometer sensor embedded on the projectile, completed with a three axis accelerometer. The algorithm has been tested on real data recorded during a free flight test over a distance of 400 meters. The results show that we can estimate milliradians with non-linear equations and approximations, with good accuracy.