第三部分详细的论述了在海上这种特殊的环境里，应采用INMARSAT-B卫星通信系统作为传输手段的原因。
The third section discusses the reason of adopting INMARSAT-B satellite communication system as the transmission measure in the special environment on the sea in detail.
现在海上通信系统主要有卫星通信、单边带、甚高频(VHF)。
Now maritime communications systems primarily include satellite communications, single side band, VHF (VHF).
终端位置更新速率又是卫星通信系统终端位置管理的重要指标，直接影响到海上卫星移动通信系统的性能。
Terminal location update rate (LUR) is a very important index of Marine satellite mobile communication system, which affects the performance of whole system violently.
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