一、引言自卫星通信问世以来,人们就开始研究将此技术应用于航空的可能性。早在1964年,美国首次进行了飞机与地面的卫星通信试验。但从60年代初到70年代末的10多年间,航空卫星通信一直处于初期的研究、实验阶段,其发展处于停滞不前的状态。另一方面,民用航空作为发展最快的高科技产业之一,自80年代以来得到了迅速发展。1987年,全球航空旅客人数第一次突破10亿人次大关,预计到 I. INTRODUCTION Since the advent of satellite communications, people began to study the possibility of applying this technology to aviation. As early as 1964, the United States conducted the first satellite-to-earth communication test between the aircraft and the ground. However, from the early 1960s to the late 1970s, aviation satellite communications have been in the initial research and experimental stages and their development has been stagnating. On the other hand, as one of the fastest growing high-tech industries, civil aviation has enjoyed rapid growth since the 1980s. In 1987, the number of global air travelers exceeded the 1 billion mark for the first time and is expected to arrive