Magnetometer-Based Phase Shifting Ratio Method for High Spinning Projectile's Attitude Measurement

Accurate measurement of high spinning projectiles' attitude is the basis of guidance and control. In order to reduce the attitude measurement error and improve the attitude update rate, a magnetometer-based phase shifting ratio method is proposed in this paper. This method does not introduce additional installation errors as the existing methods, simplifies the calibration of the extreme value ratio-pitch angle curve, and makes full use of the measurement data of the sensors. The attitude update is synchronized with the magnetometer output without using the local geomagnetic information. Simultaneously, the local geomagnetic errors are avoided. The results of numerical simulation and semi-physical simulation experiments show that compared with the three orthogonal ratio method and the crest and trough method, the proposed algorithm in this paper can increase the attitude update rate by more than 2 times and the attitude calculation accuracy can be enhanced by 30%.