磁阻传感器的地磁信号干扰研究和修正

摘要

针对地磁场信号很微弱造成的与弹体横截面采集的两路正交地磁信号直接相关的滚动角值很容易受到弹体环境干扰的问题,对此两路正交地磁信号进行了干扰影响分析及其修正算法研究,介绍了有局限性的椭圆拟合的误差补偿算法.在此基础上,提出了一种相位修正的算法,通过对方位检测系统的地面仿真测试数据和实弹飞行实验数据进行算法验证研究,证明了该算法可有效消除干扰,能够一定程度上消除地磁信号的干扰,对提高滚动角的解算精度具有实用价值.%Rolling angle collected by the cross section of missile is directly related to the two orthogonal geomagnetic signals,and it is easy to be disturbed by the environment because of the weak geomagnetic signal. Aiming at this problem,the interference and correction algorithm were analyzed. An ellipse-fitting compensation algorithm was introduced. On this basis,the phase correction algorithm was proposed. The ground simulation test data on the orientation detection system and the real data of bullet were tested and verified. The result shows that the algorithm can eliminate the interference and reduce the impact of inter-ference,and it is of practical value to improve the measurement accuracy of geomagnetic signal and the accuracy of attitude parameters.