Mr. Ki Hong Im Profile

Ki Hong Im

at Seoul National Univ

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Proceedings Article | 2 May 2006 Paper

Adaptive design for digital nonlinear autopilot of ship-to-ship missiles

Ki Hong Im, Dongkyoung Chaw, Jin Young Choi

Proceedings Volume 6042, 60420Y (2006) https://doi.org/10.1117/12.664581

KEYWORDS: Missiles, Aerodynamics, Calcium, Error analysis, Performance modeling, Krypton, Feedback control, Electrical engineering, Computer science, Electronics engineering

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This paper proposes a practical design method for ship-to-ship missiles' autopilot. When the pre-designed analogue autopilot is implemented in digital way, they generally suffer from severe performance degradation and instability problem even for a sufficiently small sampling time. Also, aerodynamic uncertainties can affect the overall stability and this happens more severely when the nonlinear autopilot is digitally implemented. In order to realize a practical autopilot, two main issues, digital implementation problem and compensation for the aerodynamic uncertainties, are considered in this paper. MIMO (multi-input multi-output) nonlinear autopilot is presented first and the input and output of the missile are discretized for implementation. In this step, the discretization effect is compensated by designing an additional control input. Finally, we design a parameter adaptation law to compensate the control performance. Stability analysis and 6-DOF (degree-of-freedom) simulations are presented to verify the proposed adaptive autopilot.

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