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本文详细描述了一个为中国设计的国内卫星通讯系统,用于提供话音、数字和电视业务。该系统计划1985年完成。它拟利用国际卫星组织的通讯卫星的转发器,沟通重要中心站的主台与边远地区各终端站之间的通讯联络。本文提供了地面站和主要子系统的技术特性,这些子系统包括天线、高功率放大器(HPA),低噪声放大器(LNA)和地面通讯设备。文章特别强调了SCPC通道装置(注:S C,P C一一每个载波一个通道)的设计,该装置利用C V S D编码,传输话音时采用墨2K b/S(即千字节/秒)速率B P S K,传输数据时采用6 4 K b/S速率Q P S K,当需要保密时可采取加密措施。线路予算给出了可达到的信/噪比和误码率指标。
This article describes in detail a domestic satellite communications system designed for China to provide voice, digital and television services. The system is scheduled to be completed in 1985. It intends to use the satellite communication transponder of the International Satellite Organization to communicate the communication between the main station of an important central station and the terminal stations in remote areas. This article provides the technical features of ground stations and major subsystems, including antennas, high power amplifiers (HPAs), low noise amplifiers (LNAs), and ground communications equipment. In particular, the article highlights the design of the SCPC channel device, which uses CVSD encoding with a 2K b / S ink rate BKBK (kilobytes per second) when transmitting voice, The data transfer rate is 6 4 K b / s rate QPSK, and encryption can be used when confidentiality is required. Line to calculate given achievable signal / noise ratio and bit error rate index.