星载GPS自主定轨的长期稳定性  

The Stability of Autonomous Orbit Determination with Onboard GPS

作　　者：熊永清[1] 贾沛璋[2] 

机构地区：[1]中国科学院紫金山天文台,南京210008 [2]中国科学院系统科学所,北京100080

出　　处：《天文学报》2006年第4期467-474,共8页Acta Astronomica Sinica

基　　金：国家自然科学基金(10373028)资助

摘　　要：通过模拟长达100天的星载GPS伪距观测资料,进行卡尔曼滤波定轨仿真计算．重点研究：1)采用简化的动力学模型与简化状态转移矩阵,是否保证滤波的长期稳定性；2)模型误差矩阵Q的选取对滤波定轨精度的影响；3)与事后最小二乘批处理相比较,在简化模型下自主定轨的精度．同时给出了相应的结论．With simulated onboard GPS data covering 100 days, a test of orbit determination strategy using Kalman filter is performed. The study focuses mainly on three problems： the secular stability of orbit determination by the mean of reduced dynamic model and reduced state transition matrix, the effect of model error covariance Q on the precision of orbit determination, and the precision of reduced Kalman orbit determination by comparing with least square solution. Three conclusions corresponding to these problems are given： The secular stability of orbit determination isn＇t changed by means of reduced dynamic model and reduced state transition matrix; the selection of model error covariance Q has a loose range; the precision of reduced Kalman orbit determination is at the same level with the precision of least square solution.

关 键 词：天体测量 自主定轨 卡尔曼滤波 星载GPS 

分 类 号：P123[天文地球—天体测量]