terrestrial trunked radio

TETRA ( Terrestrial Trunked Radio) is a digital trunked standard proposed by ETSI. It has a strong command and control functions, and has high frequency utilization, data security is good, more flexible network control.

TETRA（Terrestrial Trunked Radio）是由ETSI提出的数字集群标准，它具有较强的指挥调度功能，并且具有频率利用率高，数据保密度好，网络控制更加灵活等优点。

The Performance Measurement of Equipments of Terrestrial Trunked Radio System

TETRA数字集群移动通信系统设备的性能测试

This paper describes the basic theory of speech compression encoding and decoding algorithm in TETRA ( terrestrial trunked radio) system.

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。

TETRA ( Terrestrial Trunked Radio) is a series of standards made by ETSI on digital radio trunking communications system. Many functions of TETRA are designed to meet the special requirements of police and other public safety organizations, which include information security.

由ETSI制定的无线集群移动通信标准&TETRA标准中的很多功能是为满足警察和其他公共安全部门的特殊要求而设计的，这些特殊要求中包含了安全方面的要求。