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In China, we have over 100 enterprises with more than a high-quality products and services, such as AMD, SONY, TETRA PAK, MAGIC AMAH, Taike Brown, Changxing chemical, Morita chemicals.

在中国，我们已经为超过一百多家企业提供了优质的产品及服务，如AMD、SONY、 TETRA PAK、 MAGIC AMAH、泰柯棕化、长兴化工、森田化工等。

ETSI has, amongst many other standards, created the TETRA standard.

ETSI制定了包括TETRA标准在内的许多标准。

The TETRA terminal, which we will develop, is a kind of smart mobile terminal, which not only can be used as a normal TETRA mobile terminal, but also has some special functions, such as GIS.

此次所开发的TETRA终端是一种智能移动终端，它除了具有传统TETRA移动终端的所具备的一切功能外，还拥有GIS等功能。

TETRA Server is a background program, which is responsible for transferring information between telephone program and TETRA main board. Thirdly, a telephone program of smart phone is researched in depth; Finally, I implemented the voice functions of TETRA smart mobile terminal by reference to the idea of the telephone program.

TETRA Server是一个后台程序，负责电话程序与TETRA主板之间的信息传递；再次，对一个智能手机的电话程序进行了深入的分析；最后，通过借鉴智能手机的电话程序的编程思想，实现了TETRA智能移动终端的各项语音功能。

Therefore, it has practical significance to develop TETRA digital trunked system equipment which has independent intellectual property rights.

因此，开发具有自主知识产权的TETRA数字集群系统设备具有实际意义。

Of the success that the TETRA Association has had with this process, it is

TETRA协会在认证方面取得了很大的成功，据估

This article gives an overview of TETRA digital trunked communication systems technical features and development condition in the country.

本文综述了TETRA数字集群通信系统技术特点及其在国内外的发展状况，结合TETRA数字集群系统的发展趋势。

This thesis describes the principle of TETRA and the application of digital TETRA in metro dispatcher system.

论文从TETRA的原理出发，结合实际工程运用，深入研究了数字集群TETRA在地铁列车调度系统的实际应用。

With the development of TETRA digital trunked communication in our country, the requirement for TETRA digital trunked system equipment will be increasing step by step.

随着我国TETRA数字集群通信的发展，TETRA数字集群系统设备的需求量不断上升。

There are five parts in this article. Firstly, it introduces the theory of TETRA and the future. And it even describes the main significance of applying TETRA in metro dispatcher system. Secondly, by comparing, it summarizes the development of Trunked system in our country. Thirdly, the principle of TETRA system is described. The fourth part is the main point of this article.

论文内容为：第一部分是从TETRA集群通信理论和应用广阔前景出发，阐述了研究TETRA在地铁调度系统中应用的重大意义；第二部分从集群发展出发，比较并总结了集群通信系统的情况，以及我国在此领域的发展状况；第三部分系统概述了TETRA系统的工作原理等技术。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。