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Online Identification and Control of Guiding System Based on Inverse System DETAILS - nimy - 10-04-2017 Online Identification and Control of Guiding System Based on Inverse System [attachment=16175] . INTRODUCTION The analysis and design of a nonlinear system are more complicated and difficult than those of linear system. A simple way is to convert the nonlinear system into a linear one, and design the control system with linear system theory. The exact linearization method with the differential geometry [1] is a power tool to design the control system for a class of nonlinear system. But it needs strict conditions and has a complicated structure. The basic idea of the inverse system method is to compensate a nonlinear system as a linear system with the inverse system of the objective . CONTROL ALGORITHM The mathematic model of the guiding system is a nonlinear, time-varying, and multivariable system. The partial couplings between each control channel and the gravitation influence are treated as the interference item of the time-varying parameters. The influence of unmodelled error is eliminated with robust adaptive control method. The mathematic model of pitching channel is showed as follow. The yawing channel has the same structure and it will not be presented in the paper. INTEGRATING INVERSE SYSTEM WITH PARAMETER IDENTIFICATION For the pitching channel and yawing channel, the guiding system can be converted into an approximate linear system with integrating inverse system method with parameter identification. The structure of the system is showed in Fig.1. where, u(k) (control signal of missile rudder) is input signal of the system. |