MultiVariable Frequency Domain Stability Analysis for Satellites with MultiStage Drive Mechanisms

A multivariable frequency domain stability analysis method is proposed in this paper for multistage compound control systems in satellites with multistage drive mechanisms. Firstly, a satellite integrated linear model with multistage drive mechanism is established based on the model simplification. A singlechannel output linear feedback controller is designed for the attitude control system. Using the transfer function matrix fractional description, the polynomial matrix transformation is used to obtain the pole distribution of multichannel closedloop systems. The stability conditions of multivariable frequency domain input and output of the closedloop system are determined. The example and simulation results show that this method can verify the stability of closedloop satellite system with multistage drive mechanism and provide an effective tool for controller parameter design.