机载安装误差对捷联惯导系统的综合影响研究

Research on influence induced by installation error in SINS

机载惯导系统的安装误差会引起加速度计输出中的附加干扰加速度,以及陀螺仪输出中的陀螺漂移,从而对惯导系统产生影响。针对捷联惯导系统(SINS)中的机载安装误差进行了深入全面的研究,推导出角安装误差和位置安装误差同时存在时系统的误差模型,并对机载安装误差给导航系统精度带来的影响进行了系统仿真。仿真结果表明:安装角误差和位置误差对于惯导系统的精度带来不可忽视的影响,将会引起惯导系统的迅速发散,必须对其加以补偿。该研究对于提高SINS的对准精度提供了理论依据,具有较好的工程应用价值。

Installation error in inertial navigation system causes an additional interference acceleration existed in accelerater output and gyros drift in gyros output,which can lead to navigation errors. By analysing systematically from theoretical point of viewing the installation error in strapdown inertial navigation system （SINS） ,the system＇ s error model when there are both position-installing error and angle-installing error is concluded, and the influence on SINS＇ s accuracy caused by installation error is simulated. The results represent the disadvantages stemming from installation error, and the errors can cause rapid accuracy distortion of SINS which must be compensated. The research can paly a positive role in improving the accuracy in the initial alignment of the gimbaled SINS,and be valuable for engineering application.