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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2017, Vol. 38 ›› Issue (5): 320503-320503.doi: 10.7527/S1000-6893.2017.320503

• Material Engineering and Mechanical Manufacturing • Previous Articles     Next Articles

A positioning method with two satellites by relative position constraint

LI Zheng, ZHANG Hai, WANG Weiyang   

  1. School of Automation Science and Engineering, Beihang University, Beijing 100083, China
  • Received:2016-06-07 Revised:2017-01-08 Online:2017-05-15 Published:2017-02-10

Abstract:

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.

Key words: GNSS, two visible satellites, positioning, relative position constraint, integrated navigation

CLC Number: