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一、引言电星系统的地面站通讯天线波束很窄,需将能量射向相距几千哩直径只有3呎的卫星,并接收微弱的回波讯号。它要在绕方位轴和仰角轴两者运动的状态下工作。此外还
I. INTRODUCTION The satellite antenna system has a very narrow beam of ground communication antennas and needs to direct its energy towards satellites that are only 3 feet in diameter and thousands of miles away and receive weak echo signals. It should work in a state of motion around both the azimuth and elevation axes. Plus also