非线性系统变结构观测器及其在空间拦截中的应用

VARIABLE STRUCTURE OBSERVER FOR NONLINEAR SYSTEMS AND ITS APPLICATION TO THE SPACE INTERCEPTION

The design of the variable structure observer for nonlinear systems and its application to the space interception are discussed in this paper. The design problem of the variable structure observer under unmatched conditions is also presented. The relative motion equations between interceptor and target in the sight coordinate are derived, and the nonlinear guidance law is given based on the discussion of 5]. For the engineering problem that unmeasurable physical variables are containted in the nonlinear guidance law, the design of a nonlinear state observer is introduced, which ensures the realization of the nonlinear guidance law. Finally, the digital simulation proves the effectiveness of the state observer designed in the paper.