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.
近年来，随着通信的飞速发展，作为专用移动通信系统的数字集群通信系统的研究也变得越来越重要了。
Recent years, with the rapid development of communication, the research of digital trunked radio communication system becomes more and more important.
随着数字时代的到来，原有的模拟集群的许多功能已经不能满足人们的需求，研制我们自己的数字集群系统是非常必要的。
As the digital times is coming, many function of the former analog trunked system can't satisfy the demand of people, it is necessary for us to research our own digital trunked system.
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