Abstract
Satellite communications are utilized widely fields -navigations, broadcast and scientific. Recently mobile communications and satellite broadcast are developing remarkably. And the active antenna pointing sysem is required so that we may communicate with satellite in transportation, such as sail boat, truck and car. In this case, we can assume that the antenna base receives perturbation of a high frequency, and we must construct a compact antenna control system with high response. In this research, we use an existing antenna system consisting of a 2-axis gimbal structure driven by stepping motor and a 3-axis vibratory rate gyroscope to control the base attitude. The antenna system is used to track a Japanese broadcast satellite in geostationary orbit. We propose intellectual satellite position search system with feedback control using AGC level and feedforward control using gyro sensor to correct various errors. This papers discusses the 2-axis gimbal structure, sensor system, control algorithm, and experimental result.
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