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本课题即是军用数字集群通信系统的预研项目的一部分。
The task is a portion of the pre-reaserch project of the digital trunk system for military.
TETRA作为最著名的数字集群通信系统之一，其高效性和安全性得到了越来越多的关注。
As one of the most famous kinds of digital trunked communication system, TETRA's efficiency and security have been cared more and more.
TETRA协议是欧洲电信标准协会(etsi) 1998年公布的一种数字集群通信系统标准。
In 1998, ETSI publicized TETRA protocal, which is a standard of digital trunked radio communication system.
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