Modeling irregular small bodies gravity field via extreme learning machines and Bayesian optimization

Roberto Furfaro, Riccardo Barocco, Richard Linares, Francesco Topputo, Vishnu Reddy, Jules Simo, Lucille Le Corre

Research output: Contribution to journalArticlepeer-review

Abstract

Close proximity operations around small bodies are extremely challenging due to their uncertain dynamical environment. Autonomous guidance and navigation around small bodies require fast and accurate modeling of the gravitational field for potential on-board computation. In this paper, we investigate a model-based, data-driven approach to compute and predict the gravitational acceleration around irregular small bodies. More specifically, we employ Extreme Learning Machine (ELM) theories to design, train and validate Single-Layer Feedforward Networks (SLFN) capable of learning the relationship between the spacecraft position and the gravitational acceleration. ELM-base neural networks are trained without iterative tuning therefore dramatically reducing the training time. Analysis of performance in constant density models for asteroid 25143 Itokawa and comet 67/P Churyumov-Gerasimenko show that ELM-based SLFN are able learn the desired functional relationship both globally and in selected localized areas near the surface. The latter results in a robust neural algorithm for on-board, real-time calculation of the gravity field needed for guidance and control in close-proximity operations near the asteroid surface.

Original languageEnglish (US)
Pages (from-to)617-638
Number of pages22
JournalAdvances in Space Research
Volume67
Issue number1
DOIs
StatePublished - Jan 1 2021

Keywords

  • Asteroid
  • Extreme learning machine
  • Gravity modeling

ASJC Scopus subject areas

  • Aerospace Engineering
  • Astronomy and Astrophysics
  • Geophysics
  • Atmospheric Science
  • Space and Planetary Science
  • Earth and Planetary Sciences(all)

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