基于地磁测量的火箭弹滚转角解算误差补偿方法研究

为实现火箭弹弹道修正,需实时解算弹体的滚转角。根据地磁场基本特性,采用两轴磁传感器测量地磁场分量,并同时测量弹道倾角以解算弹体姿态角。提出一种火箭弹弹体滚转角解算的误差补偿方法,进行某型火箭弹打靶试验,利用该方法对火箭弹飞行试验过程中的姿态角数据进行实时解算,并与陀螺测量到的滚转角数据进行比较。试验结果表明:利用该方法解算滚转角准确度在4°以内,能够满足火箭弹弹道修正的要求。

Error compensation method for flight attitude angles of rocket projectile based on geomagnetic field measurement

In order to correct the trajectory of rocket projectile, the roll angle needed to be calculated in real time. Geomagnetic detection was employed for roll angle measurement. However, for the geomagnetic detection, the most common disturbances were hard and soft iron errors. So the aim of the research was to provide a solution for roll angle determination in the presence of magnetic field disturbances. For measuring the roll angle, two-axis magnetic sensor was utilized to measure the geomagnetic field. A roll angle compensation method based on geomagnetic detection was introduced. The 2-dimensional geomagnetic data was averaged in several periods before trajectory correction. The guidance scheme by roll angle was proposed according to the geomagnetic data and the starting control point parameters were also designed properly. The method was employed in the rocket projectile trajectory correction experiment. The result showed that the roll angle error was less than 4° comparing with the gyro data. The data roll by compensation method could satisfy the demand of trajectory correction.