Potential Contribution of Tianwen-1 Extended Mission to Mars Low-Order Gravity Field

被引：0
|
作者：
Liu S. [1 ,2 ,3 ]
Yan J. [1 ]
Yang X. [4 ]
Ye M. [1 ]
Guo X. [1 ]
Wang B. [1 ]
Li F. [1 ]
机构：
[1] State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan
[2] National Key Laboratory of Science and Technology on Aerospace Flight Dynamics, Beijing
[3] Beijing Aerospace Control Center, Beijing
[4] State Key Laboratory of Satellite Navigation System and Equipment Technology, Shijiazhuang
来源：
Wuhan Daxue Xuebao (Xinxi Kexue Ban)/Geomatics and Information Science of Wuhan University | 2023年 / 48卷 / 01期
关键词：
GGM-3; Mars gravity field model; power spectrum; Tianwen-1;
D O I：
10.13203/j.whugis20210035
中图分类号：
学科分类号：
摘要：
Objectives: Tianwen-1 is the first independent interplanetary mission of China, and it was launched on 23 July 2020 and delivered directly into the Earth-Mars transfer orbit, which arrived at Mars in February 2021. It will complete orbiting, landing, and roving tasks in one operation. Exploiting tracking data from gathered during this science exploration and extended mission, this paper explores possible ways to improve the Mars gravity field model by simulation.Methods: We designed two types of orbits, including the polar orbits with near zero eccentricity and the near equatorial orbit with large eccentricity. Based on these two types of orbits, we recovered six gravity solutions considering various error sources, such as measurement noise, solar pressure error, rotation model error, and tracking time length. We used the power spectrum method to analyze and evaluate these recovered gravity models.Results: We find that a month of tracking data from the polar orbit or the combined polar and near equatorial orbit could be used to properly reconstruct the Mars gravity field model with orders and degrees of 42 under the 0.1 mm/s measurement noise. When 10% solar pressure error is added, the gravity model solution only suffers a slight influence showing in the power spectrum analysis. Furthermore, when Mars rotation model error is added, the degree variances of gravity models are affected only after the 35-order and degree.Conclusions: The results show that considering the influence of comprehensive error, the accuracy of gravity field solutions of the two types of orbits is similar. Nevertheless, the orbit with large eccentricity near the equator has a slightly stronger constraint on more than 35-order and degree coefficients. Besides, when the track tracking data collected from the near equatorial orbit phase are added in the recovering of Mars gravity model, the proposed model can improve the precise orbit determination accuracy of a spacecraft with near-equatorial orbit. © 2023 Wuhan University. All rights reserved.
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页码：58 / 64
页数：6
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