强磁干扰环境下磁航向误差补偿技术研究

解决强磁环境下磁强计易受干扰的问题，能够提高微型姿态参照系统航向角测量精度。建立了磁强计误差两次补偿模型，首先采用椭圆坐标修正法对磁强计进行罗差补偿，以减小环境磁场的干扰；其次采用最小二乘拟合法对获得的磁航向角进行二次补偿，提高系统航向角测量精度。试验结果显示：系统航向角测量值的误差均方值由补偿前的3．982°降为补偿后的0．386°，精度提高近10．3倍，表明该补偿方法能够有效降低磁场环境的干扰，提高系统航向角测量精度。

Research on Magnetic Heading Error Compensation Technology under the Strong Magnetic Interference

Solving the problem that performance of magnetometers are vulnerably disturbed in strong magnetic field can improve the accuracy of miniature attitude heading reference system. A two compensation model is established for the magnetometer. Firstly, elliptical coordinates compensation is employed to compensate the compass deviation for the magnetometer, which can decrease the interference of environmental magnetic field. Secondly, least square fitting method is adopted for further compensating the magnetic heading to improve the accuracy of heading measurement. Experimental results indicate that the mean square error of heading measure ments is reduced from 3. 982° to 0. 386°, which makes an accuracy improvement factor of about 10.3 times. It can be seen that the proposed method is capable of reducing the measurement error of magnetometer and improving the accuracy of system heading significantly.