Police traffic radar USES the theory of Doppler speed detection to measure the offset of the frequency.

雷达测速仪是利用多普勒测速原理，获得运动目标的频率偏移信号。

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Police traffic radar USES the theory of Doppler speed detection to measure the offset of the frequency.

雷达测速仪是利用多普勒测速原理，获得运动目标的频率偏移信号。

youdao