导航星座的自主定位与守时研究  

Autonomous Positioning and Timing for Navigation Constellation

作　　者：刘建业[1] 郁丰[1] 贺亮[2] 熊智[1] 

机构地区：[1]南京航空航天大学导航研究中心,南京210016 [2]中国航天八一二研究所,上海200233

出　　处：《宇航学报》2009年第1期215-219,共5页Journal of Astronautics

基　　金：国家863基金(2006AA704312)

摘　　要：星座自主导航技术能有效地提高导航星座的自主导航能力和星历精度,增强系统的生存能力。分析了基于星间测距信息的星座自主导航方法,推导了星间测距信息的位置与时间的解耦模型与条件,提出首先进行位置更新,然后进行时间更新的解算流程。根据状态方程与量测方程的特点,推导了适合导航星座自主导航解算的分布式卡尔曼滤波算法。并给出了关键的仿真技术。仿真表明:通过双向测距信息,能有效地实现导航星座的自主定位,保持星间高精度的时间同步。Constellation autonomous navigation techniques can effectively enhance autonomous navigation performance of navigation constellation and ephemeris, and improve system survivability. In the paper, constellation autonomous navigation method based on inter-satellite ranges is analyzed, decoupling model and condition for position and time from inter-sateLlite are achieved; resolution process that position updating and time updating are sequentially executed is available. According to features of state equations and measurement equations, distributed kalrnan algorithm suitable for navigation constellation autonomous navigation is derived. Key simulation techniques are presented. Simulation indicates that navigation constellation autonomous positioning and inter-satellite time synchronization are achieved based on inter-sateUite ranges.

关 键 词：导航星座 双向测距 自主导航 时间同步 KALMAN滤波 

分 类 号：V848[航空宇航科学技术]