Simultaneous navigation and mascon gravity estimation around small bodies

被引:1
|
作者
Sanchez, Julio C. [1 ,2 ]
Schaub, Hanspeter [2 ]
机构
[1] Univ Seville, Dept Ingn Aerosp & Mecan Fluidos, Seville 41092, Spain
[2] Univ Colorado Boulder, Dept Aerosp Engn Sci, Boulder, CO 80309 USA
基金
欧盟地平线“2020”;
关键词
Small body exploration; Spacecraft autonomy; Deep space navigation; Gravity field modeling; COMPENSATION; ASTEROIDS; FIELD;
D O I
10.1016/j.actaastro.2023.09.023
中图分类号
V [航空、航天];
学科分类号
08 ; 0825 ;
摘要
This manuscript develops a simultaneous navigation and gravity estimation strategy around a small body. The scheme combines dynamical model compensation with a mascon gravity fit. Dynamical compensation adds the unmodeled acceleration to the filter state. Consequently, the navigation filter is able to generate an on -orbit position-unmodeled acceleration dataset. The available measurements correspond to the landmarks-based navigation technique. Accordingly, an on-board camera is able to provide landmark pixels. The aforementioned position-unmodeled acceleration dataset serves to train a mascon gravity model on-board while in flight. The training algorithm finds the optimal mass values and locations using Adam gradient descent. By a careful choice of the mascon variables and constraints projection, the masses are ensured to be positive and within the small body shape. The numerical results provide a comprehensive analysis on the global gravity accuracy for different estimation scenarios.
引用
收藏
页码:725 / 740
页数:16
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