Orbit determination of Tianwen-1 with one-way Doppler

doi:10.11947/j.AGCS.2023.20220085

Abstract

Abstract: Precision orbit determination of Tianwen-1 using one-way Doppler is a first trial in deep space exploration of China. In this paper, a method of orbit determination with one-way Doppler is proposed. Firstly, the observation model of one-way Doppler is established and the theoretical error is analyzed. Secondly, the orbit determination of Tianwen-1 is carried out using one-way Doppler during the relay orbit phase. The orbital accuracy is evaluated in two ways, the first one is orbital comparison with precision orbit determined using UXB and VLBI, the second one is overlap comparison. The results show that the instability of ultra-stable oscillator and phase scintillation error are the main error sources that affect the accuracy of one-way Doppler measurement. The orbital accuracy can be better than 1 km using only one-way Doppler during the relay phase, and can provide important support for China's future deep space exploration missions.

Key words: Tianwen-1, one-way Doppler, orbit determination, error analysis, orbit determination accuracy

CLC Number:

P228

KONG Jing, ZHANG Yu, DUAN Jianfeng, CHEN Lue, WANG Hong, FAN Min. Orbit determination of Tianwen-1 with one-way Doppler[J]. Acta Geodaetica et Cartographica Sinica, 2023, 52(4): 588-595.

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