Error analysis and compensation methods of geomagnetic attitude detection accuracy affected by projectile swing

This paper addresses the issue of significant measurement errors in geomagnetic/GPS combined attitude detection systems due to projectile swing. By analyzing the errors caused by projectile swing, a new attitude detection method based on the combination of geomagnetic and gyroscope is proposed. The method involves establishing a geomagnetic-gyroscope combined attitude detection model, using the angular rates measured by a two-axis MEMS gyroscope to calculate the projectile’s yaw angle in real-time, and combining it with the three-dimensional geomagnetic components output by the geomagnetic module to solve for the projectile’s attitude information. The results show that compared with the geomagnetic/GPS combined solution, adding a gyroscope module can eliminate the error fluctuations in roll and pitch angles caused by projectile swing, enabling stable attitude measurement under various motion conditions.