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1.前言日本于1978年4月发射了一颗中型实验广播卫星(BSE),以成形波束覆盖日本全境。BSE溢入我国东部地区的场强已减弱甚多。为了对这一微弱信号进行收测,需要用灵敏度较高的接收设备。1978年10月,我们在东北某地对BSE进行了收测,使用的接收天线是直径3米的卡塞格伦型天线,用正交场混频器直接混频并加镜象回收的方式,得到了较好的收测效果。应用镜象回收技术降低了噪声系数,与
1. Introduction Japan launched a medium-sized Experimental Broadcasting Satellite (BSE) in April 1978 to shape the beam across Japan. BSE overflow into the eastern part of China’s field strength has been greatly reduced. In order to receive and measure this weak signal, need to use the receiver device with higher sensitivity. In October 1978, we tested BSE in a northeastern part of the country. The receiving antenna used was a Cassegrain antenna with a diameter of 3 meters. The antenna was directly mixed with orthogonal field mixer and image recovery , Got better receiving effect. Application of image recovery technology to reduce the noise figure, and