旋转-静止混合对准方案在旋转火箭弹中的应用

由于成本考虑,旋转火箭弹捷联惯导系统中使用中低精度陀螺,利用传统的初始对准方法,对准精度难以满足要求。针对旋转火箭弹的特点,提出了一种旋转调制的非线性对准方法,利用该方法,Y轴和Z轴陀螺的随机漂移得到调制,从而提高了对准精度。针对单纯旋转调制对准无法精确估计陀螺漂移的缺点,提出了一种旋转—静态混合对准方案,利用旋转调制的对准结果,在静止段对陀螺漂移进行精确估计。仿真结果表明,由两个精度为0.2(°)/h和一个精度为0.01(°)/h的陀螺组成的捷联惯导系统,在230 s内对准误差小于0.05°,同时可准确估计出三个陀螺的漂移。该方案具有一定的工程实用价值。

New method of initial alignment with rotary-static process for rotary rocket

Considering from cost,the SINS of the rotary rocket is composed of low or medium precision gyroscope,so traditional methods are difficult to meet the requirements on alignment accuracy.A non-linear alignment method of rotating modulation for initial alignment is proposed based on the characteristics of the rotary rocket.Using this method,the random drifts of the Y-axis and Z-axis gyros get modulated,and the alignment accuracy can be improved.Because the gyro drifts can not be estimated simply through rotating modulation alignment,a new scheme of rotary & static initial alignment is put forward.In static alignment progress,the drifts of gyros can be well estimated by using the result of rotation alignment progress.The simulation results show that the attitude angle error of the SINS consisting of two 0.2(°)/h gyros and one 0.01(°)/h gyro is no more than 0.05° within 230 s after alignment,and the drifts of three gyros can be well estimated.This scheme is can be used in engineering practice.