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arXiv · 2005.03245

A Chance Constraint Predictive Control and Estimation Framework for Spacecraft Descent with Field Of View Constraints

Steven van Leeuwen
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Abstract

Recent studies of optimization methods and GNC of spacecraft near small bodies focusing on descent, landing, rendezvous, etc., with key safety constraints such as line-of-sight conic zones and soft landings have shown promising results; this paper considers descent missions to an asteroid surface with a constraint that consists of an onboard camera and asteroid surface markers while using a stochastic convex MPC law. An undermodeled asteroid gravity and spacecraft technology inspired measurement model is established to develop the constraint. Then a computationally light stochastic Linear Quadratic MPC strategy is presented to keep the spacecraft in satisfactory field of view of the surface markers while trajectory tracking, employing chance based constraints and up-to-date estimation uncertainty from navigation. The estimation uncertainty giving rise to the tightened constraints is particularly addressed. Results suggest robust tracking performance across a variety of trajectories.

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Steven van Leeuwen. 2020-05-21. A Chance Constraint Predictive Control and Estimation Framework for Spacecraft Descent with Field Of View Constraints. https://arxiv.org/abs/2005.03245

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