利用积分比值的旋转弹体地磁测姿方法

Integral ratio method for the geomagnetic attitude measurement of spinning projectiles

针对目前大量常规弹药低成本姿态测试的需求,微惯性传感器存在的漂移特性不能提供长时间稳定姿态角的问题,本文提出了利用三正交磁传感器的积分比值姿态测试方法。推导了磁传感器输出信号之间的积分比值与弹体俯仰角的理论公式,采用多点的统计特征比值代替单点特征比值。对积分比值法进行了适用性分析,分析了积分误差及偏航角误差造成的俯仰角查表误差;通过仿真对比分析,在低信噪比情况下,积分比值法比三正交比值法的解算精度高了5倍左右。半实物实验结果表明:积分比值法的姿态角解算误差在±0.6°以内。该姿态解算方法抗干扰能力强,数据利用率和姿态解算精度高,是一种简单有效的弹体测姿方法,能够满足旋转弹体的姿态测试要求。

A low-cost method for the attitude measurement of spinning projectiles is designed based on the integral ratio method by using a triorthogonal magnetic sensor.The proposed method can be used to measure the attitudes of a large number of conventional ammunition and resolve the inability of the drift characteristic of the microinertial sensor to provide the long-term stable attitude angle.The theoretical formula of the integral ratio between the output signals of the magnetic sensor and the pitching angle of the projectile is deduced.The multipoint statistical feature ratio is used instead of the single-point feature ratio.The integral ratio method is subjected to applicability analysis to analyze the error caused by the integral error and yaw angle error in the pitch angle lookup table. Simulation and comparison reveal that the accuracy of the integral ratio method in the case of low SNR is approximately five times more than that of the triorthogonal ratio method.Semiphysical experiments verify that the error of the attitude angle obtained by the integral ratio method is within ±0.6°.The method for attitude solution has strong anti- interference ability,high data utilization rate,and high attitude calculation accuracy and is a simple and effective new method that can meet the requirements for the attitude measurement of spinning projectiles.