目前,中低轨道卫星系统的发展,已使个人之间在任意时间、任意地点之间的快速通讯成为可能。三大中低轨道系统,即摩托罗拉的“铱系统”;Loral Qualcomm的“Globlestar”及TRW的Odyssey;虽然这些系统由于种种原因相继推迟了商业服务时间,但大都能于2000年前开始运营。随着各系统提供商业服务的时间愈来愈近,它们的经营者对市场的重视程度也愈来愈高。继摩托罗拉、Globlestar之后,TRW也将 At present, the development of LEO satellite systems has made it possible for individuals to rapidly communicate at anytime, anywhere. The three low-or-middle orbit systems, namely Motorola’s “Iridium System”; Loral Qualcomm’s “Globlestar” and TRW’s Odyssey; although these systems have been postponed due to various commercial service hours, but most of them can start 2000 years ago. As systems become more and more time-consuming on commercial services, their operators are placing more emphasis on the market. Following Motorola, Globlestar, TRW will also