The E-TDMA-based GMH2000 fixed radio system developed by Hughes Network Systems (HNS) provides an effective local radio loop solution for the public telephone service.
休斯网络系统公司(HNS)的GMH2000固定无线系统是一个基于E - TDMA的系统，它为公用电话业务提供了最有效的无线本地环路的解决方案。
At ancient times, people were navigated by means of sun, fixed stars, etc., while currently the common navigation systems are astronomic navigation, inertial navigation and radio navigation.
以前，人们主要利用太阳、星星等自然天体。现在人们利用的导航系统主要有：天文导航系统、惯性导航系统、无线电导航系统三大类。
At ancient times, people were navigated by means of sun, fixed stars, etc., while currently the common navigation systems are astronomic navigation, inertial navigation and radio navigation.
以前，人们主要利用太阳、星星等自然天体。现在人们利用的导航系统主要有：天文导航系统、惯性导航系统、无线电导航系统三大类。
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