导航星座自主导航技术--自主星历更新

自主星历更新是导航星座自主导航的关键技术之一，包括卫星轨道精密确定和轨道短时预报两个方面的内容。本文在系统地论述导航星座自主导航的信息处理流程的基础上，重点提出星座卫星轨道精密确定的自适应Kalman滤波算法。系统仿真结果表明：通过星间双向测量数据的滤波处理，能够获得高精度的卫星星历和较小的用户测距误差（URE），满足高精度导航定位需求，初步证明导航星座自主导航信息处理流程及其星历更新算法的合理性和可行性。

Autonomous Navigation Techniques of Navigation Constellation --Autonomously Updated Ephemerides

The autonomous updating of the navigation ephemerides is one of the key techniques for the autonomous navigation of navigation constellation.It includes two studying aspects,the precise determination and short-time prediction of the navigation satellite orbits.Comparing to the precise orbit determination,the implementation for the short-time orbit prediction is very easy.Therefore,on the basis of systematically describing the data processing flow for the autonomous navigation of navigation constellation,the algorithm of the adaptive Kalman filtering applied to orbital determination is presented as a core part of this paper.Finally,it is shown from the results of systematic simulation that the highly accurate ephemerides and small user ranging errors(URE) can be obtained by processing the crosslink measurement data with the Kalman filter.The feasibility and rationality of the autonomously updated ephemerides and data processing flow for the autonomous navigation of navigation constellation is demonstrated preliminarily.