An H∞ Controller With Wind Disturbance Rejection Properties for the DSS-13 Antenna

The feed-forward and linear quadratic Gaussian (LQG) controllers significantly reduced the servo error at higher rate tracking. However, the servo error due to wind disturbances acting on the antenna structure is still significant. This error cannot be reduced by the feed-forward controller and is only moderately reduced by the LQG controller. The H∞ controller design approach gives the possibility of addressing the problems of command following and disturbance rejection. The H∞ controller that was designed for the DSS-13 antenna improves the tracking performance of the existing LQG controller and significantly reduces the servo error due to wind disturbances. The antenna model, as well as the wind model, were obtained from the field tests rather than from analysis, which increases confidence in the simulation results.