一种基于可观测度分析的SINS/GPS空中对准新方法  

Novel In-Flight Alignment Based on Observability Analysis for SINS/GPS

作　　者：刘百奇[1] 房建成[1] 

机构地区：[1]北京航空航天大学仪器科学与光电工程学院,北京100191

出　　处：《系统仿真学报》2008年第16期4302-4305,4348,共5页Journal of System Simulation

基　　金：国家863计划项目(2006AA12A108);国家自然科学基金(60602047).

摘　　要：针对遥感飞机长时间直线飞行作业时,由于SINS/GPS组合导航系统可观测度低导致系统精度下降的问题,提出了一种基于可观测度分析与杆臂误差补偿的空中机动对准新方法。该方法将归一化处理后的系统状态可观测度作为反馈因子,在空中对准过程中根据反馈因子对SINS系统进行自适应反馈校正,同时补偿了影响GPS观测量精度的杆臂效应误差。半物理仿真结果表明,该方法与传统方法相比,有效地提高了空中机动对准的精度。To retard the accuracy decreasing due to the direct feedback of some system states with lower observability, a novel in-flight alignment method based on observability analysis and level-ann error compensation for SINS/GPS was proposed. The estimated value of Kalman filter is adaptive feedback through a factor which is the normalized observability of the state, and the level-arm error of GPS velocity which degrades the precision of GPS velocity is compensated. The semi-physical simulation was carried out, and the simulation results indicate that this new in-flight alignment can improve the accuracy of the SINS/GPS in the case of incomplete observable.

关 键 词：SINS/GPS 卡尔曼滤波 反馈校正 可观测度 杆臂误差 

分 类 号：V249.32[航空宇航科学与技术—飞行器设计]