一种基于相对位置约束的双星定位方法
A positioning method with two satellites by relative position constraint
Received date: 2016-06-07
Revised date: 2017-01-08
Online published: 2017-02-10
李正 , 张海 , 王伟扬 . 一种基于相对位置约束的双星定位方法[J]. 航空学报, 2017 , 38(5) : 320503 -320503 . DOI: 10.7527/S1000-6893.2017.320503
The global navigation satellites system (GNSS) needs at least four visible satellites to provide accurate and continuous positing result. However, under harsh conditions such as urban canyon, tunnels and other special environments, the number of visible satellites usually becomes less than four, which leads to degradation of positioning precision or infeasibility of the positioning algorithm. This paper presents a novel method to provide reliable position solution with only two visible satellites. The relative position change during a short period is utilized as a constrain condition to estimate the absolute position of GNSS receiver in this paper. The feasibility of the proposed method is proved. The numerical algorithm and geometrical searching algorithm are proposed respectively. The simulation experiment has been carried out and the result demonstrates that the proposed method is effective in improving the positioning performance. The proposed method has better performance than the conventional INS/GNSS coupled method and the positioning results do not rely on the initial position's precision.
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