Libration point orbit rendezvous using PWPF modulated terminal sliding mode control |
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Authors: | Yijun Lian Guojian Tang |
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Institution: | School of Aerospace Science and Engineering, National University of Defense Technology, 410073 Changsha, China |
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Abstract: | The near-range rendezvous problem of two libration point orbit spacecraft in the Earth–Moon system is studied using the terminal sliding mode control which enables a time-fixed process with the flight time prescribed a priori. The underlying dynamics are the full nonlinear equations of motion for a complete Solar System model. For practical purposes, two means of pulse-width pulse-frequency (PWPF) modulation are employed to realize the theoretical continuous control with a series of thrust pulses. Extensive simulations with major errors taken into account show that the sliding mode controller can successfully guide the chaser to a given staging node with the final position and velocity errors, on average, lower than 20 m and 1 mm/s, respectively. Compared with the glideslope guidance previously studied, the proposed approach outperforms the former by saving approximately 50–60% of total delta-v. |
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Keywords: | Libration point orbit Rendezvous Siding mode control PWPF Earth&ndash Moon system |
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