However, the scattered light is extremely weak and therefore yields a very low signal.
然而，这种散射光极其微弱，因此只产生一个非常弱的信号。
And because the big diameter lens is used to collect scattered light, the Doppler signal of high SNR is obtained.
使用大口径透镜收集散射光得到高信噪比的多普勒信号。
And because the big diameter lens is used to collect scattered light, the Doppler signal of high SNR is obtained.
使用大口径透镜收集散射光得到高信噪比的多普勒信号。
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