移动卫星通信车载站若干关键技术讨论

Discuss on Some Key Technologies of Mobile Satellite Communication System Vehicular Station

由于移动卫星通信系统中的车载站在通信过程中是运动的,因此存在卫星功率有限、传输高速业务与移动站低天线增益之间的矛盾;系统有时是在非高斯信道中工作的,电波传播情况复杂;地面终端的天线时刻对准所使用的卫星。对如何利用有限的卫星功率条件,在地面终端的快速移动中,实时传输宽带多媒体业务,涉及卫星的带宽和功率、移动终端能力、天线伺服跟踪等相关问题进行了讨论,给出了设计原则和设计思路。

Because the vehicular station in mobile satellite communication system is moving during the communication, conflicts exist between the satellite for its limited power and high transmission speed and the mobile station for its low antenna gain. Sometimes the system works in non-Gauss charmel where the electronic wave propagation is complicated while the antenna of ground terminals should align to the employed satellite uninterruptedly. The paper carries out discussion on real-time transmission of broadband multimedia services during the fast motion of earth terminal under limited satellite power, bandwidth and power relating to satellite, capability of mobile terminal and antenna servo ＆ track. The paper also presents the design principles.