Fixed-time sliding mode attitude tracking control for a submarine-launched missile with multiple disturbances
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This paper studies a novel adaptive fixed-time sliding mode attitude tracking control for a submarine-launched missile, which is affected by sea winds, sea waves, ocean currents and other disturbances during the water-exit process. Firstly, the nonlinear water-exit dynamic model of the submarine-launched missile is established, and then it is transformed into a simple second-order attitude tracking system. Subsequently, a novel non-singular fixed-time fast terminal sliding mode surface (NFFTSMS) with fixed-time convergence is presented, and the pre-established settling time is also developed. Moreover, a novel adaptive non-singular fixed-time fast terminal sliding mode control (ANFFTSMC) is presented by employing a fixed-time disturbance observer, a fixed-time differentiator and the proposed NFFTSMS. Closed-loop stability of the proposed controller is proved by utilizing the Lyapunov methodology. Finally, numerical simulations including two typical launch trajectories of the missile are carried out to demonstrate the strong robustness of the proposed control scheme.
KeywordsSubmarine-launched missile Attitude tracking control Non-singular fixed-time fast terminal sliding mode control Multiple disturbances Fixed-time disturbance observer Fixed-time differentiator
The authors would like to thank the financial supports by the National Nature Science Fund of China (Grant No. 61403100), the open Fund of National Defense Key Discipline Laboratory of Micro-Spacecraft Technology (Grant No. HIT.KLOF.MST.201704), and the Fundamental Research Funds for the Central Universities (Grant No. HIT.NSRIF.2015.037).
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Conflict of interests
The authors declare that there is no conflict of interest regarding the publication of this paper.
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