Artículo
Simultaneous navigation and mascon gravity estimation around small bodies
Autor/es | Sánchez Merino, Julio César
Schaub, Hanspeter |
Departamento | Universidad de Sevilla. Departamento de Ingeniería Aeroespacial y Mecánica de Fluidos |
Fecha de publicación | 2023-12 |
Fecha de depósito | 2023-11-13 |
Publicado en |
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Resumen | 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 ... 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 onorbit 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. |
Agencias financiadoras | European Union (UE). H2020 |
Identificador del proyecto | 101025257
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Cita | Sánchez, J.C. y Schaub, H. (2023). Simultaneous navigation and mascon gravity estimation around small bodies. Acta Astronautica, 213, 725-740. https://doi.org/10.1016/j.actaastro.2023.09.023. |
Ficheros | Tamaño | Formato | Ver | Descripción |
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AA_2023_Sanchez_Simultaneous_OA.pdf | 5.554Mb | ![]() | Ver/ | |