弹载磁测系统等效安装误差的在线标定与补偿

On-line calibration and compensation of equivalent installation error of magnetic measurement system on missile

摘要:

针对旋转弹用磁测系统在飞行过程中，存在由机械安装误差以及固定磁干扰带来的测量系下三轴磁矢量与弹体系不平行问题，提出一种磁测系统与弹体之间等效安装误差角的在线标定补偿法。通过分析磁测系统实时输出的三轴地磁矢量信息，建立测量信息与误差的误差模型，利用类正弦信号特征值求取误差角，进而补偿磁测信息中的误差项，最终提高磁测系统解算输出的滚转角精度。实验结果表明，当弹体仅做滚转运动时，经过该方法补偿后磁测系统解算的滚转角比补偿前解算的滚转角精度可提高6倍以上，滚转角解算误差保持在2°以内，可以满足制导弹药对滚转角的精度需求。

Abstract:

In order to solve the problem that the magnetic vector of three axes under the measuring system is not parallel to the missile system caused by the mechanical installation error and fixed magnetic interference during the flight of the magnetic measuring system for rotating missile, an online calibration and compensation method for the equivalent installation error Angle between the magnetic measuring system and the missile body was proposed. The error model of measurement information and error is established by analyzing the real-time output of the magnetic survey system's triaxial geomagnetic vector information, and the error Angle is obtained by using the characteristic value of sinusoid-like signal, and then the error term in the magnetic survey information is compensated, and the accuracy of the output roll Angle of the magnetic survey system is finally improved. The experimental results show that when the projectile body only rolls, the accuracy of roll Angle calculated by the magnetic measuring system after compensation is more than 6 times higher than that before compensation, and the error of roll Angle calculation is kept within 2°, which can meet the precision requirement of guided ammunition for roll Angle.