捷联惯导系统初始对准精度评估算法

摘要

惯导系统初始对准精度评估是惯导系统性能分析中的难点问题,为了提高对准精度,利用最优平滑技术对惯导系统导航段数据做后向平滑,得到初始对准结束时刻真实状态的最优估计,并且对惯导对准的精度进行评估,克服了在实际应用中无法对惯导系统初始对准精度进行直接测试的问题.建立了捷联惯导系统误差模型,采用了上述固定点平滑技术的惯导系统初始对准精度评估算法.对初始对准姿态误差的仿真结果表明,算法可以高精度地估计出对准结束时刻的载体姿态真值.%Evaluation of INS initial alignment is the difficulty in performance analysis of INS.The optimal smoothing technology,which has overcomed the measurement problem of the inertial navigation initial alignment precision,has been used to test and evaluate the accuracy of INS initial alignment,by the method which estimates the initial state as a reference.The basic error model of SINS was modeled,an accuracy evaluation method of SINS initial alignment based on fixed-point smoothing algorithm was proposed.Simulation result of attitude error in initial alignment shows the high precision estimation of attitude truth-value.