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1 引言目前国际上流行的数字集群标准主要有TETRA、IDEN、FHMA三种，尽管它们在系统性能上各有千秋，但从标准的公开性和知识产权的独占性方面考虑, TETRA更有利于我们进行研究与开发，所以我们研制的数字集群系统就以TETRA标准作为参考。通过系统论证和实际测试，我们在基站
1 Introduction At present, there are mainly three standards of digital trunking which are popular in the world: TETRA, IDEN and FHMA. Although they have their own advantages and disadvantages in system performance, TETRA is more conducive to our research because of its standard openness and the exclusiveness of intellectual property And development, so we developed a digital trunking system to TETRA standard as a reference. Through systematic demonstration and practical testing, we are at the base station