为了使得射频源和波导管的频率保持一致，采用了自动频率控制系统(afc)。
In order to make the RF source and the waveguide have the same resonant frequency, the automatic frequency control (AFC) system is used.
射频ic卡系统及车道控制系统是不停车收费系统的重要组成部分。
Both the RF IC card system and the automatic control system of toll collection station are the important part of automatic charging system.
为了使得射频源和波导管的频率保持一致 ，采用了自动频率控制系统 （AFC）。
This paper introduces an AFC algorithm for a zero-intermediate frequency direct-sequence spread spectrum digital receiver.
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