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一、汽车电话技术近况日本电气通信研究所从1907年开始推进800MHz 汽车电话系统的第一期研究实用化计划。从1979年12月以来,在东京、大阪地区进入了商用服务,并获得了好评。第一期计划的目的在于开辟800MHz 新频段,从技术上基本实现了能扩大到全国使用的大容量汽车电话系统。设计条件则着眼于东京、大阪等大城市。第二期计划是在1976年到1981年内进行的,目的在于进一步普及汽车电话。其主要内容是研究用于中小城市(亦称中容量)的汽车电话系统以及新型移动台。新型移动台的研究以
First, the status of car phone technology Nippon Electric Institute of Communications from 1907 to promote 800MHz car phone system, the first phase of research and practical plans. Since December 1979, it has entered commercial service in Tokyo and Osaka and has won favorable comments. The first phase of the program aims to open up the 800MHz new band, basically from the technical realization of the country can be extended to use large-capacity car phone system. Design conditions focus on Tokyo, Osaka and other big cities. The second phase was carried out between 1976 and 1981 with the aim of further popularizing car phone calls. Its main content is to study the car phone system used in small and medium cities (also known as medium capacity) and a new type of mobile station. Research on new mobile stations