Double-loop sliding mode control of reentry hypersonic vehicle with RCS

Song, Jia and Hao, Ce and Zhang, Yanxue and Yu, Nanjia and Liu, Yang and Yang, Erfu; (2019) Double-loop sliding mode control of reentry hypersonic vehicle with RCS. In: 2019 IEEE 15th International Conference on Control and Automation, ICCA 2019. IEEE International Conference on Control and Automation, ICCA . IEEE, GBR, pp. 109-114. ISBN 9781728111643 (https://doi.org/10.1109/ICCA.2019.8899548)

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Abstract

In order to solve the problem of insufficient aerodynamic moment caused by thin air in the re-entry stage of hypersonic vehicle, this paper establishes an attitude angle model of hypersonic vehicle with reaction control system (RCS), and derives its affine linear model to decoupled the internal and external loop. According to the dead zone and saturation characteristics of RCS thruster, a control method to convert continuous moment into discrete switching instruction using pulse width modulation (PWM) is proposed. Since the number of thrusters is usually redundant, the installation matrix of thrusters in the body coordinate is established, and the command moment is coordinately distributed to the individual thrusters. Then a double-loop sliding mode controller (DSMC) is designed to achieve attitude stability and trajectory tracking. Finally, the simulation results show that DSMC has higher maneuverability, fewer thruster switches and stronger robustness to interference.

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