A GNSS Receiver Satellite Selection Strategy in Constellation Occlusion Scenario
When GNSS receivers work in environments such as cities,dense forests and canyons,the constellation may be incomplete since satellite signals are seriously blocked.Considering that the traditional maximum tetrahedron volume method cannot reflect the occlusion effectively in Beidou satellite navigation and positioning system,a new satellite selection strategy based on Geometric Dilution Precision(GDOP)analysis is proposed.The altitude angle threshold is set,and the geometric layout is analyzed according to the altitude angle and azimuth angle of the satellite when the threshold condition is met,and the satellite combination participating in the positioning solution is selected by constructing the maximum tetrahedral volume.The computer simulation results show that in constellation occlusion scenario,the calculation amount of the algorithm is reduced by more than 95％compared with the optimal geometric accuracy factor algorithm,and the performance is improved by 2.62 dB compared with the maximum tetrahedron volume method.The algorithm can achieve accurate and fast satellite selection while ensuring the positioning accuracy,and it has good performance and feasibility.
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