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Scan loop control design for a spin-stabilised seeker

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1 Author(s)
Lee, H.-P. ; Agency for Defense Dev., Taejeon, South Korea

A scan loop model for a spin-stabilised seeker is introduced, which includes gyrodynamics with direct- and cross-spring constants for considering the autoerection effect of the gyro. LQG/LTR and H controllers are designed for the seeker scan loop system which has model uncertainty and is subject to external disturbances. The performance of the LQG/LTR controller can be improved by obtaining uniform singular values over all frequencies for the target feedback loop. The H controller is designed in the framework of the standard H optimisation problem with model matching. The proposed H method can reflect not only frequency domain specifications but also time domain ones, such as response characteristics and multi-variable interaction between output channels, differently from the mixed sensitivity problem. It is shown that the designed LQG/LTR and H controllers offer good performance and robustness properties, and both controllers are very effective in the seeker scan loop system

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Control Theory and Applications, IEE Proceedings -  (Volume:145 ,  Issue: 2 )