Doppler radio Direction Finder is a technology that measures the Angle between radio transmitter and the radio using Doppler effect (Dopplerprinciple).
多普勒无线电测向技术即为利用多普勒效应测定无线电发射设备与接收设备之间夹角的一种技术。
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According to the principle of view the Doppler frequency detection, the detector makes up of the transmitter, the transfer circuit, receiver and signal processing circuit.