微惯性传感器高过载对准方法

High-Overload Alignment Method Based on MEMS

摘要: 针对高速、过载条件下的微惯性传感器对准问题，本文设计了一种加速度计冗余对称安装的配置方案，提出了一种基于卫导信息 + 自旋信号分解的对准方法。根据卫导信息建立姿态推算算法快速解算弹体航向和俯仰初始角度。针对弹体自旋情况，利用对称双加速度计配置方案，根据双加速度计量测信号的相位辨识及误差补偿技术，结合微惯性陀螺转速信号，运用递推最小二乘算法，突破基于周期信号的横滚姿态快速获取技术，实现制导炮弹空中高动态快速对准。通过仿真分析在弹体高速旋转条件下，水平对准误差小于0.2˚，航向误差小于0.5˚的精度水平。

Abstract: Aiming at the alignment problem of Micro-Electro-Mechanical System (MEMS) under high speed and overload conditions, this paper designed a configuration scheme of redundant and symmetrical installation of accelerometer, and proposed an alignment method based on the satellite navigation information + spin signal decomposition. Based on the satellite navigation information, the attitude algorithm is established to quickly solved the projectile heading and inertial pitching angle. In view of the spin condition of the projectile body, the phase identification and error compensation technology of measured signal are used according to the configuration scheme of symmetrical double accelerometer. Combined with gyro signal and recursive least square algorithm, this method breaks through the technology of rapid acquisition of roll attitude based on periodic signal, and realizes high dynamic and rapid aerial alignment of guided projectiles. Through simulation analysis, the horizontal alignment error is less than 0.2˚ and the course error is less than 0.5˚ under the condition of high speed rotation of projectile body.