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Precision Analysis of Zero-difference Orbit Determination with Satellite-Based GPS
Author(s): 
Pages: 12-15
Year: Issue:  4
Journal: Journal of Shandong University of Science and Tech

Keyword:  非差定轨 相位平滑伪距 误差分析 轨道预报;
Abstract: 采用一种变相的"非差"动力定轨方法,建立了相应的数学模型,编制了星载GPS低轨卫星的定轨软件,并以此分析了定轨过程中各主要误差源对定轨的影响以及所能达到的定轨精度和预报精度。该方法以相位平滑伪距为观测值,通过对同一历元的观测值进行卫星间求差,消除了星载GPS接收机钟差,模型简单,求解参数少。在只估计初始坐标和速度参数、考虑各种误差的综合影响时,定轨一天的径向精度约为3m,能满足一定的定轨精度要求。
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