The Analysis of Wind Gust Disturbances on the Cassegrain Antenna Pointing Accuracy

In deep space exploration, the information about the antenna pointing accuracy is required for prediction of the antenna performance in windy weather. The traditional design of large-diameter antenna generally uses finite element analysis method, it assumes a spatial correlated wind gust model which causes symmetrical wind loads, so the simulation results in the azimuth direction are always much smaller than the field measurements. This paper introduces autoregressive filter method to simulate wind gust stochastic process, considers the wind gust effect as a time-variant torque, and then apply this model to a typical 34-m cassegrain antenna servo system. In the end the simulation results of antenna pointing errors are given, which match the field measurements very well.