Abstract
To find the optimal rendezvous time and order of each target in a multi-rendezvous mission, it’s nessassory to evaluate Δv between different targets with different departure times and transfer durations. To improve the efficiency of Δv evaluation, this paper proposes an analytical method for assessing the optimality of a given double-impulse trajectory by leveraging relative dynamic equations based on orbital differences. Furthermore, a gradient-based nonlinear programming algorithm is established for the rapid optimization of three-impulsive trajectory when the double-impulse trajectory is suboptimal. The methodology is validated through various case studies, encompassing both low-Earth-orbits and asteroid orbits. The results indicate that our optimality checks align with the prime vector theory while demanding fewer computations. Additionally, the three-impulsive solutions rapidly obtained via our nonlinear programming algorithm are consistent with those obtained from multi-impulse evolutionary optimization models. A multi-target rendezvous optimization case also proves its applicability to optimization of multi-rendezvous missions.
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