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卫星电视广播是卫星通信领域的一个重要分支。由于卫星电视广播克服了地面电视广播存在的服务面积小,城市构筑物形成“阴影区”等缺点而引起了世界各国的普遍重视,得到了迅速的发展卫星电视广播接收机是地面电视广播接收机(通称电视机)的延伸。做为信号终端的仍然是电视机,此外仅增加适应卫星通信特点的传输设备,因此卫星电视广播接收机的设计主要是针对传输方面的问题来进行的。卫星电视广播接收机的设计一般考虑如下几个方面的问题:天线尺寸与高频电路的选择;中频频率与变频次数的选择;卫星电视广播接收机与地面电视广播系统接口问题。
Satellite television broadcasting is an important branch in the field of satellite communications. Satellite TV broadcasting has overcome the shortcomings of terrestrial television broadcasting such as the small service area and the shortcomings of urban structures forming a “shadow zone”, which have caused widespread attention in various countries in the world and have been rapidly developed. Satellite television broadcasting receivers are terrestrial television broadcasting receivers Commonly known as TV) extension. As the signal terminal is still the TV, in addition to increase the transmission equipment to adapt to the characteristics of satellite communications, satellite TV broadcast receiver is designed mainly for transmission problems. Satellite television broadcast receiver design generally consider the following aspects: the antenna size and selection of high-frequency circuits; IF frequency and frequency of choice; satellite TV broadcast receiver and terrestrial television broadcasting system interface problems.