混合小推力航天器轨道保持高性能滑模控制

doi:10.7527/S1000-6893.2018.22827

Abstract

Abstract: For a spacecraft using hybrid solar sail and solar electric propulsion, the station-keeping control of the heliocentric displaced orbit is investigated. To solve the problem that internal unmodeled dynamics and external unknown disturbances are not considered comprehensively in the existing methods, and to further improve the performance of the system, a high-performance sliding mode control strategy is designed. Firstly, considering the uncertainty of the model, the dynamic equation of the hybrid low-thrust spacecraft keeping on heliocentric displaced orbit is established in the cylindrical coordinate system. Secondly, the control law is designed based on the improved conditional integral sliding surface and Radial Basis Function (RBF) neural network, and the uncertain parameters are estimated online by combining the adaptive method. Then, under the optimum condition of propellant, the virtual control variables are converted into actual control variables, namely attitude angles of solar sail and solar electric propulsion. Finally, numerical simulation verifies that the above design enhances the robustness of the system, reduces the overshoot of orbit position, and hybrid propulsion improves the control accuracy by 4 orders of magnitude in shorter convergence time compared to single solar sail propulsion, while it can save about 89.6% propellants a year compared to single solar electric propulsion.

Key words: hybrid low-thrust propulsion, solar sails, heliocentric displaced orbit, conditional integral sliding surface, Radial Basis Function (RBF) neural network, adaptive control

CLC Number:

V448.2

CHEN Yicheng, QI Ruiyun, ZHANG Jiarui, WANG Huanjie. High-performance sliding mode control for orbit keeping of spacecraft using hybrid low-thrust propulsion[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2019, 40(7): 322827-322827.

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High-performance sliding mode control for orbit keeping of spacecraft using hybrid low-thrust propulsion

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