voice frequency system 话频制 ; 音频系统
radio frequency system 射频系统 ; 高频系统
quadruple-frequency system 四频制
standard frequency system 标准频率系统
At present, the Time and Frequency System of high accuracy which contains many atomic clocks builds and keeps a time scale according some algorithm. And the atomic clock has to be in a good state.
目前，高精度时间频率系统是由多台原子钟联合守时，通过一定的算法建立和维持的，参加守时的原子钟必须处于良好的运行状态。
参考来源 - 原子钟性能分析平台软件的设计与实现·2,447,543篇论文数据，部分数据来源于NoteExpress
Time-frequency system is employed for the channel.
通道采用时间-频率划分。
In this thesis the signal processing of stepped frequency system which applied in the millimeter wave seeker is discussed particularly.
本文主要针对毫米波导引头频率步进体制的信号处理技术进行了研究。
Therefore it satisfies operating requirements for time-frequency system and high-stability local oscillator, and has good application prospects.
因此比较好的满足了时频系统，特别是高稳定本振系统的使用要求，而且有着良好的应用前景。
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