As the modulation of amplitude is dust particle, the fluctuation and peaks are shown in the power gain spectrum.
当振幅调制为灰尘颗粒时，功率增益谱出现起伏，并且产生尖峰。
Using the time-gain compensation technique to compensate for ultrasonic waves weaking when transmitting in the air, and reduce the fluctuation of echo signal.
采用了时间增益补偿技术和峰值时间检测技术，可正确检测超声波回波的到达时间。
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