钟滑动辅助GNSS定位算法研究  

GNSS Positioning Aided by Clock Coasting

作　　者：李蝉[1] 刘旭东[1] 

机构地区：[1]北京跟踪与通信技术研究所

出　　处：《飞行器测控学报》2011年第5期72-75,共4页Journal of Spacecraft TT&C Technology

摘　　要：针对GNSS卫星星座几何形状不好或者观测卫星数量不足,无法为导航解算和自主完好性监测提供足够观测量的问题,提出采用GNSS接收机时钟观测值进行辅助定位,提高定位精度,实现自主完好性监测。通过对接收机时钟建模,引入本地钟的钟差方程、辅助接收机观测方程,从而建立了一套完整的钟滑动辅助定位算法。通过对采集的真实数据作计算机仿真,证明了该算法的可行性和有效性。结果表明,在卫星星座几何形状较差或者某颗卫星出现故障时,利用钟差辅助算法能够有效地排除故障星,得到较好的定位结果。In cases of bad geometry of satellite constellation or shortage of observational satellites,inadequate observations will be available for GNSS navigation solution and receiver autonomous integrity monitoring.To solve the problem,this paper proposes the use of clock observations to improve the positioning precision of GNSS receivers and monitoring of autonomous integrity.Clock coasting for GNSS receivers is modeled and clock equation is introduced.The model is used as an aid to observation equation of receivers and an integrated GNSS positioning solution based on the aid of clock coasting is built.Simulation with real data verifies the feasibility and validity of the model.The results indicate that clock coasting helps to eliminate a failure satellite and improve positioning precision in cases of bad geometry of satellite constellation or a satellite fault.

关 键 词：全球导航卫星系统 时钟滑动 导航解算 

分 类 号：P228.4[天文地球—大地测量学与测量工程]