共 22 条
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.
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页码:725 / 740
页数:16
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