CEAS EuroGNC 2024
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Analytical characterization of the off-pointing probability for a spin-stabilized S/C subject to random particle impacts
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| Andrea Pizzetti |
GNC/AOCS Engineer, Deimos Space S.L.U., Flight Segment, 28760, Tres Cantos, Madrid, Spain. | | Andrea Fabrizi |
GNC/AOCS Engineer, Deimos Space S.L.U., Flight Segment, 28760, Tres Cantos, Madrid, Spain. |
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| Abstract:
The pointing error is used as an important figure of merit since the first phases of the GNC design. However, its evaluation is not straightforward when it depends on parameters characterized by a high degree of uncertainty or when the system dynamics are driven by discrete random processes. A method is proposed to characterise analytically the off-pointing probability of a spin stabilised S/C subject to random particle impacts, based on the composition of the statistical distributions associated with the mission parameters. The Probe B2 of the Comet Interceptor mission is used as a case study. The mission goal is to complete a flyby around an as-yet-undiscovered comet. The probe is passively spin-stabilized and its ACS design and verification involves the development of a comet dust flow model to assess the off-pointing of the spin-axis due to multiple impacts of dust particles. The random variables considered are the number of impacts, the closest-approach distance, the mass of the impacting particle, as well as the impact position and velocity. Each of them is modeled with an appropriate distribution, accounting for the mission constraints and the properties of the probe B2 itself. Then, the probabilities of interest are derived and successfully cross-validated against the ones obtained from a Monte Carlo simulation campaign. Design decisions can be carried out quickly iterating between performance evaluation, parameters tuning and requirements definition, proving the effectiveness of the proposed method as an agile tool for preliminary pointing error evaluation in scenarios with discrete random processes, such as those involving particle impacts.
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| Keywords: Stochastic; Pointing Budget; Spin; Impacts; Probability; Monte Carlo |
 View PDF CEAS-GNC-2024-006 |
| Andrea Pizzetti, Andrea Fabrizi: Analytical characterization of the off-pointing probability for a spin-stabilized S/C subject to random particle impacts. Proceedings of the 2024 CEAS EuroGNC conference. Bristol, UK. June 2024. CEAS-GNC-2024-006.
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| BibTeX entry:
@Incollection{CEAS-GNC-2024-006,
author = {Pizzetti, Andrea and Fabrizi, Andrea},
title = {Analytical characterization of the off-pointing probability for a spin-stabilized S/C subject to random particle impacts},
booktitle = {Proceedings of the 2024 {CEAS EuroGNC} conference},
address = {Bristol, UK},
month = jun,
year = {2024},
note = {CEAS-GNC-2024-006}
}
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