基于小波变换的水下超声波测距方法研究

通过分析传统的阈值检测法超声波测距的缺点,提出了基于小波变换的水下超声波测距方法.应用数字信号处理技术,设计出基于Hamming窗函数的数字带通滤波器,对采样信号进行数字滤波,构造高斯小波基.介绍了一种将采样信号与小波基做卷积进行小波变换,精确捕捉回波信号到达时刻的超声波水下测距系统.在实验室水池中分别用传统的阈值检测法和基于小波变换的超声波测距法进行了实验测量,并对测量数据进行了比较,验证了基于小波变换的水下超声波测距可以达到更高的测量精度,优于传统的阈值检测法.

Research into Distance Measurement Method With Underwater Ultrasonic based on Wavelet Transform

The disadvantages of traditional ultrasonic distance measure method by detecting threshold of echo are analyzed,and the distance measure method by underwater ultrasonic based on wavelet transform is proposed.With the digital signal processing technique,the digital pass-band filter based on Hamming window function is designed and the sampling signal is filtered.Gauss wavelet is constructed.An underwater ultrasonic distance measure system is presented,which catches the echo time accurately with the wavelet transform by convoluting the sampling signal and the wavelet.The experiments are done using the traditional method by detecting threshold and the ultrasonic distance measure method based on wavelet transform separately in the laboratory pool and the measure data are compared.It proves that the distance measure method with underwater ultrasonic based on wavelet transform can gain higher precision and excels the traditional method by detecting threshold.