Improved Integral Ratio Method of Geomagnetic Sensors for Spinning Projectile’s Attitude Measurement

Attitude measurement of spinning projectiles using geomagnetic sensors plays a vital role in projectile’s navigation and flight control. However, the high-dynamic condition of the projectile brings severe challenges to the attitude measurement. In this paper, an improved integral ratio method is proposed, which introduces multipoint statistical feature ratio and unbiased minimum variance estimation theory to improve the attitude estimation frequency and precision. Firstly, the geomagnetic sensors measurement model of three-axis orthogonal coordinate system is introduced. Then, with a focus on addressing the limitations of the existing algorithms, an improved integral ratio method with anti-interference ability and optimized attitude calculation strategy is proposed. Finally, both simulation and experiment are conducted to validate the effectiveness of the proposed method. The method presented in this paper can effectively improve the frequency and precision of attitude estimation and is suitable for spinning projectile’s attitude measurement.