基于地磁信息的火箭弹滚转角测量系统研究

在火箭弹飞行过程中,为实现火箭弹弹道修正,需实时解算弹体的滚转角。该文根据地磁场基本特性和火箭弹飞行过程中姿态变化关系,通过姿态变换矩阵,建立滚转角解算数学模型。搭建基于地磁信息的滚转角测量系统,采用两轴磁传感器测量地磁场矢量,辨识火箭弹滚转姿态信息。滚转角系统在火箭弹上进行飞行搭载试验,结果表明,利用地磁得到的解算滚转角线性度良好,与陀螺测得的弹体旋转速度相匹配,能够满足火箭弹弹道修正的要求。

Flight attitude angles measurement system of rocket projectile based on geomagnetic field

In order to correct the trajectory of the rocket projectile, the attitude angle needed to be calculated in real-time. The aim of the research was to provide a solution for roll angle determination in the presence of magnetic field disturbance. During rocket flight, the geomagnetic field component changed in each sensor as the result of the changed Euler angle. The attitude angle computational formula was designed according to the transformation matrix. For measuring the roll angle, two-axis magnetic sensor was utilized to measure the geomagnetic field in the article. The guidance scheme by roll angle was proposed according to geomagnetic data and the starting control point parameters were also designed properly. The method was employed in the rocket projectile trajectory correction experiment. And roll angular counted by the method could satisfy the demand for trajectory correction.