ECEF坐标定位下极区格网惯导误差算法研究

Research on Inertial Navigation Error Algorithm for Polar Grid in ECEF Coordinate Positioning

极区飞行格网惯性导航方式能够较好地解决由于极区子午线在极点汇聚收敛所导致的传统惯导系统定向丢失、定位误差剧增的问题,但其以经纬度及高度的定位方式在极区高纬度地区依然存在过极点时刻明显跳变误差的现象,推导并采用的基于地心地固(ECEF)坐标系表示的极区格网惯性导航误差模型旨在解决此类跳变现象,提高导航定位精度,且模型可方便用于组合导航算法设计;通过仿真验证,忽略惯性器件误差条件下,基于ECEF坐标定位的导航误差规律同常规力学编排误差一致合理,可满足导航需求。

Polar flying grid inertial navigation system can solve the problem of traditional inertial navigation system losing orientation and increasing position error caused by polar meridians converging at the poles,however,it still has the phenomenon of obvious jumping error at the pole-crossing moment in the polar region in the way of positioning by longitude,latitude and altitude,the polar grid inertial navigation error model based on the earth-centered geocentric-solid(ECEF)coordinate system is developed and adopted in this paper,improving the accuracy of navigation and positioning,the model can be easily used in the design of integrated navigation algorithm.The simulation results show that the navigation error law based on ECEF coordinates is consistent with the conventional mechanical layout error and can meet the navigation requirements.