弹道修正弹滚转角辨识和误差分析

Roll Angle Identification of Trajectory Correction Projectile and Error Analysis

弹道修正弹药的滚转角度是必不可少的重要参数,通过三轴正交磁强计测量弹丸旋转时的地磁场数据,根据B2AC椭圆估计方法,将旋转弹丸内的磁场按照椭圆轨迹进行拟合。在有章动角情况下,根据旋转尾翼弹丸在直线段的飞行特性,通过建立的模型计算弹丸滚转角度,采用弦长比例和章动角幅值为系数进行补偿。数值仿真分析表明,所提出的改进方法在复攻角平面不同方向上的蒙特卡洛仿真计算,能够得到比较满意的误差结果,在给定条件下,误差基本在弹丸实际使用的允许范围内。

The roll angle of trajectory correction projectile is an important parameter. The paper describes a procedure for quantifying and compensating for roll angle offsets of trajectory correction projectile associated with three - axis magnetometer. Based on the straight - line trajectory characteristic of the rotary fin projectile, compensating by the scale of chord line and nutation angle magnitude, the roll angle is estimated using third - axis data information that includes the extended nutation angle and dip angle information through the B2AC method. The analysis of the Monte - Carlo simulation results indicates that the projectile roll angle can be measured accurately with this method and the precision is higher under ideal condition, and errors are limited in allowable range.