地地导弹快速自对准方法研究——消除外干扰影响的方法

Research on Rapid Self-aligning Method——A Method to Relieve the External Interference

讨论了消除外干扰对自对准精度影响的方法。双位置法自对准通过估计两个位置水平陀螺的输出并计算求得方位角,因此快速精确估计水平陀螺输出是高精度快速自对准的必要条件。采用零力矩法并将水平加速度表输出经二次积分得到位移序列,由位移序列多项式拟合系数估计水平陀螺输出可以有效减小估计误差。为了缩短对准时间,粗调平结束立刻开始用零力矩法测试,由多项式拟合系数精确估计粗调平剩余水平角并在估计陀螺输出时补偿。典型干扰条件下的仿真结果说明了该方法是非常有效的。

The method to reduce the self-aligning error caused by external interference is discussed. The azimuth of two-position self-aligning method is obtained by calculation with the output evaluation of gyros in level at each position, therefore, in order to obtain the fast and precise self-alignment, it is necessary to evaluate the output of gyros in level fast and precisely. The zero moment method is adopted and the displacement sequence is obtained by twice integrating the output of the accelerometers in level. The coefficients are gotten through polynomial fitting to displacement sequence, and the evaluating error can be reduced effectively when the output of gyros in level is evaluated with these coefficients. To shorten the aligning time, the test with zero-moment method is started at once when coarse level is end. The evaluating error caused by level error is compensated with the level error evaluated from fitting coefficients. The simulation with typical interference verifies the effectiveness of this method.