Fractional Fourier Transform for Ultrasonic Ranging Device
Ultrasonic ranging device send out ultrasonic pulse for the measurement,the reflected acoustic wave is received by the device and changed into electrical signal by piezoelectric sensor; the distance is calculated according to the time different of sending and receiving.But there is noise in the echo acoustic wave that will affect the quality of the received signal,which will make the reading wrong or instability.This study proposes a new filtering method,first the echo signal is processed by fractional Fourier transform,then most of the noise is filtered out by the band pass filter,finally the original signal is restored by inverse fractional Fourier transform,making echo quality better.This method integrates the information of the signal in time domain and frequency domain information,improves the signal-to-noise ratio compared with the traditional filtering methods,make signal noise separation more effectively.
Fractional Fourier transform Filtering Ultrasonic ranging Noise
ZHENG Yong-jun LI He WANG Fei ZHU Shan-an
College of Electrical Engineering,Zhejiang University,Hangzhou,Zhejiang 310007,China;College of Metr College of Metrology and Measurement Engineering,China Jiliang University,Hangzhou 310018,China College of Electrical Engineering,Zhejiang University,Hangzhou,Zhejiang 310007,China
国际会议
长沙
英文
3290-3293
2014-05-31（万方平台首次上网日期，不代表论文的发表时间）