论文部分内容阅读
我国地域辽阔,多山河湖泊岛屿沙漠,卫星覆盖是解决广播电视信号覆盖最经济有效的手段。由于卫星上转发器受各种条件的限制,发射功率不可能很大,而且它所发射的信号在传播过程中因通讯距离非常远,穿过大气层时还要受到吸收而衰减,地面站接收卫星信号又要受到周围各种电磁波的干扰,因此,了解卫星信号接收中各种
China’s vast territory, mountainous lakes, island deserts, satellite coverage is the most economical and effective means to solve the coverage of radio and television signals. Because the satellite transponders are subject to various conditions, the transmission power can not be large, and the signals it transmits are very far away due to the communication distance in the propagation process, and are also absorbed and attenuated when passing through the atmosphere. The ground station receives satellites The signal has to be disturbed by a variety of electromagnetic waves around, therefore, to understand the various satellite signal reception