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1、引言卫星通信是信息基础设施中不可或缺的组成部分。在发展初期,卫星通信曾经在公众通信网络中国际国内电路中继、用户接入等方面发挥过骨干作用。后来,由于地面光纤和移动通信的迅猛发展,除了在电视直播领域持续增长之外,卫星通信在公众通信领域一直都处于退缩状态,而主要集中于各类专网应用。究其原因,主要是卫星通信系统容量和性价比未能保持同步提升,进而影响了公众服务市场的竞争力。
1, Introduction Satellite communications are an integral part of the information infrastructure. In its early days, satellite communications played a key role in international and domestic circuit relay and user access in public communications networks. Later, due to the rapid development of terrestrial optical fiber and mobile communications, in addition to the continuous growth in the field of television broadcasting, satellite communications have been in a state of recession in the field of public communications, mainly focusing on various types of private network applications. The reason is mainly that the capacity and price / performance ratio of satellite communication systems fail to keep pace with each other, thereby affecting the competitiveness of the public service market.