机抖激光陀螺捷联系统姿态算法优化设计

机械抖动激光陀螺捷联惯性导航系统中通常要对陀螺信号进行预滤波处理以消除抖动偏频,数据滤波后其幅值和相位的变化引入了附加的姿态算法误差.为了减小此误差,研究了抖动解调滤波器的特性以及数据滤波对系统姿态算法精度的影响,推导了与滤波器匹配的姿态算法优化公式.优化算法仅修正了传统算法系数,不增加算法实现难度.仿真和实验表明,优化算法能有效减小滤波器引入的附加姿态算法误差,明显改善算法精度,有很高的工程实用价值.

Optimization of Attitude Algorithms on Dither RLG SINS

In the dither ring laser gyro(RLG) strapdown inertial navigation system(SINS),gyro outputs are often pre-filtered to eliminate the dither bias,so the distortion of magnitude and phase of filtered data induce the additional attitude algorithm errors.In this paper,the dither demodulation filter was analyzed and its influence on attitude algorithms was researched.The formulas of optimized attitude algorithm were derived to match the response of the filter.The optimization technology did not complex the algorithms because only the algorithms coefficients were amended.The simulations and experiments illustrate that the optimized algorithms can reduce effectively the additional algorithm errors and increase obviously the algorithms precision.The algorithms have great value to real application.