Trajectory Optimization for Proximity Operations Around Tumbling Geometrical Constraints via Legendre Polynomials
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2016, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved. This paper presents the development of a optimization guidance algorithm capable of generating three-dimensional trajectories enabling a small free-flyer robotic spacecraft to maneuver in close proximity to translating and tumbling satellites. Specifically, the proximity guidance law parameterizes the velocity trajectory using Legendre polynomials and optimizes their coefficients in a two-step fashion. In the first step, a sub-optimal solution that satisfies the boundary conditions, dynamics constraints, and performance limitations is obtained. In the second step, time-permitting, the optimal solution which also minimizes the path length is obtained. The performance of the guidance law is evaluated in simulation results for a fly-around scenario of both a non-cooperative stationary and tumbling target satellite.