Abstract
The multi-body dynamic model of the SAR satellite and the Ruze formula are used to investigate the antenna gain loss’s sensitivity to the control moment gyroscope. First, by using the finite element method, the satellite’s dynamic model is created and the modal characteristic is then determined. Then the distribution of input disturbance and CMG diagram is established. And the effect of each CMG disturbance on the antenna gain is studied. The sensitivity parameters of gain loss to disturbance are computed by using the One-at-a-Time (OAT) method. The results show that for CMGs, although they are placed asymmetrically and have the same loading characteristics, their effects on the antenna gain are different and need to be considered separately. The method and ideas proposed in this paper can be used to quantify the influence of various disturbances’ sensitivity and control system design.
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