Positioning method of Tianwen-1 Mars landing site based on sparse SBI measurement

doi:10.11947/j.AGCS.2024.20220179

Abstract

Abstract: We established a calculation model for the Mars landing site based on the same beam measurement of the distance between Tianwen-1 Rover landed on Mars and the orbiter, and considering the influence of general relativity theory in deep space exploration. From the relative motion relationship between the two targets, we designed a statistical positioning algorithm based on Mars space-time reference frame. We analyzed the influence of various errors and measurement arcs on the positioning accuracy of landing site through Monte Carlo simulation. The gravitational delay of general relativity theory will produce sub meter error, whose influence on the positioning of Mars site is about 100 meters. As the measurement result of the actual Mars rover is single and sparse, the orbit determination of the orbiter and the positioning of the Mars Rover are changed from parallel calculation to serial calculation, and a Mars digital elevation model is introduced to restrict the height of the landing site positioning. Finally, we improved the orbit accuracy of the orbiter and compressed the calculation arc, so the accuracy of the landing site of the Mars rover is improved from kilometer to about 300 meters.

Key words: Mars exploration, same beam measurement, landing site positioning, general relativity, Mars rover

CLC Number:

V412.4
P228

ZHANG Yu, CAO Jianfeng, KONG Jing, DUAN Jianfeng, LI Cuilan, SHEN Qianhui, SONG Chen, LIANG Meng. Positioning method of Tianwen-1 Mars landing site based on sparse SBI measurement[J]. Acta Geodaetica et Cartographica Sinica, 2024, 53(1): 91-100.

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