不同转位方案下双轴旋转惯导系统精对准分析

Fine Alignment of Twin-Axis Rotary Inertial Navigation System Under Different Rotation System

针对双轴旋转惯导系统转位方案的设计和选择问题,提出了3种合理的转位方案:16次序、24次序和32次序,建立了旋转惯导系统的误差方程和卡尔曼滤波模型。观测量取速度误差和位置误差时,分别对3种转位方案下精对准过程进行了分析仿真。结果表明,24次序转位方案精对准过程所需时间最短,精度最高,其次是32次序,16次序转位方案精对准过程所需时间最长,精度最低。

Aiming at the design and selection of rotation scheme of twin-axis rotary inertial navigation system, three reasonable rotation schemes are put forward： sixteen orders, twenty four orders and thirty two orders, and the error equation and Kalman filter model is established. When choosing speed error or position error to be observed, the fine alignment processes under different rotation schemes are simulated. The result shows that, in the fine alignment process, the twenty four orders rotation scheme needs the shortest time and has the highest accuracy, followed by thirty two rotation scheme, the sixteen rotation scheme needs the longest time and has the lowest accuracy.