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.
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.
基于TETRA数字集群移动通信系统开发的TETRA终端，通过数据业务可以发送和接收状态消息和短数据业务消息，利用短数据业务完成终端导航定位功能。
Terminal based on TETRA digital trunking mobile communication system could send and receive status and short data service message, and achieve navigation and location through short data service.
针对数字集群移动通信系统，提出一种新的随机预约控制方式，减小了预约分组信号冲突发生，提高了系统的吞吐量。
A kind of modified packet reservation random access protocol for digital trunking systems is studied, which could reduce collisions among packet reservations and increase the system's throughout.
ETSI发布的欧洲新一代全数字集群系统TETRA是当今最先进的移动通信系统之一。
The latest generation of the digital trunked system TETRA, which is defined by the European Telecommunications Standards Institute (ETSI), is one of the most advanced mobile communication systems.
TETRA数字集群系统提供安全、可靠以及高效率的语音和数据通信，在全球许多国家得到了广泛的应用。
TETRA digital trunked systems provide secure, reliable and efficient voice and data communications, which are being widely used in many countries around the world.
结合路径损耗模型给出了正常工作模式下的数字集群系统无线区域覆盖范围，并给出了不同的边缘通信概率的系统覆盖范围。
And the radio regional coverage scope with the path loss model under the normal work mode is discussed, then the different edge communication probability of coverage scope is determined.
数字集群系统TETRA提供空中接口加密和端-端加密以实现通信的机密性。
Air interface security and end-to-end encryption a re offered by TETRA to protect data during the entire transmission.
随着专业通信用户对通信网络的接续时间、可靠性以及安全性的要求不断提高，数字集群系统的系统复杂性也不断提高、业务功能不断增多。
With professional communication user constantly requiring more quickly setup a call, more reliability and more security, Trunking system complexity and business functions constantly increase.
研究了陆地集群无线通信（TETRA）数字集群移动通信系统的语音压缩编解码算法的基本原理。
This paper describes the basic theory of speech compression encoding and decoding algorithm in TETRA (terrestrial trunked radio) system.
数字集群移动通信系统作为专用移动通信的高级阶段，受到了广泛的关注。
Digital trunk mobile system is the advanced level of the special mobile communication, and it has attracted attention abroad.
数字集群移动通信系统作为专用移动通信的高级阶段，受到了广泛的关注。
Digital trunk mobile system is the advanced level of the special mobile communication, and it has attracted attention abroad.
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