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The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including by researchers from the Department of Computer & Information Sciences involved in mathematically structured programming, similarity and metric search, computer security, software systems, combinatronics and digital health.

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Design of optimal spacecraft-asteroid formations through a hybrid global optimization approach

Maddock, Christie and Vasile, Massimiliano (2008) Design of optimal spacecraft-asteroid formations through a hybrid global optimization approach. International Journal of Intelligent Computing and Cybernetics, 1 (2). pp. 239-268. ISSN 1756-378X

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The following paper presents the design of an optimal set of spacecraft formation orbits around an asteroid. The spacecraft are designed to fly in close proximity with the asteroid, avoiding its nonlinear gravity field. A behavioural-based hybrid global optimization approach is used to first characterize the solution space and find families of orbits that are a fixed distance away from the asteroid. The same optimization approach is then used to find the set of Pareto optimal solutions that minimise both the distance from the asteroid and the variation of the Sun-spacecraft-asteroid angle. The Near Earth Asteroid 99942 Apophis (2004 MN4) is used as the case study due to a fly-by of Earth in 2029 leading to two potential impacts in 2036 or 2037. Purpose - To present a methodology and experimental results on using global optimization algorithms to determine the optimal orbit, based on the mission requirements, for a set of spacecraft flying in formation with an asteroid. Design/Methodology/Approach - Two sample missions to asteroids, representing constrained single- and multi-objective problems, were selected to test the applicability of using an in-house hybrid stochastic-deterministic global optimization algorithm (EPIC) to find optimal orbits for a spacecraft flying in formation with an orbit. Two black-box optimization problems that model the orbital dynamics of the spacecraft were developed. Findings - It was found for the two missions under test, that the optimized orbits fall into various distinct families, which can be used to design multi-spacecraft missions with similar orbital characteristics. Research limitations/implications - The global optimization software, EPIC, was very effective at finding sets of orbits which met the required mission objectives and constraints for a formation of spacecraft in proximity of an asteroid. The hybridization of the stochastic search with the deterministic domain decomposition greatly improve the intrinsic stochastic nature of the multi-agent search process without the excessive computational cost of a full grid search. The stability of the discovered families of formation orbit is subject to the gravity perturbation of the asteroid and to the solar pressure. Their control, therefore, requires further investigation. Originality/value - This paper contributes to both the field of space mission design for close-proximity orbits and to the field of global optization. In particular suggests a common formulation for single- and multi-objective problems and a robust and effective hybrid search method based on behaviourism. This approach provides an effective way to identify families of optimal formation orbits.