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中文摘要: 讨论了超声波测距信号小波阈值去噪参数的选定方法和最优选取原则。在超声波测距回波信号中加入10 dB的噪声信号,在Matlab仿真环境下,用硬阈值函数、软阈值函数、半软阈值函数,分别对超声波回波信号进行处理,通过实验分析得出,在选取2层分解、消失矩阶数为5时,选择Sym7小波基、半软阈值函数降噪时,信号SNR改善较大,为5.35dB,RMSE最小,为0.094dB,说明在有效去除信号噪声的同时,重构后的失真最小。
Abstract:Discuss the parameter selection & optimal by researching the de-noising problem of wavelet transform in ultrasonic echo signal. The detailed research about the parameters optimal including how to select the wavelet base, decomposition layers, threshold value and threshold function were fully discussed. Under the Matlab environment, the hard threshold function, soft threshold function and semi-soft threshold function are utilized to deal with the ultrasonic echo signal of SNR 10dB respectively. Experimental result shows that the semi-soft threshold function can reach SNR 5.35dB and RMSE 0.094dB.
文章编号:cg16000731 中图分类号: 文献标志码:
基金项目:2015年江苏省科委基金项目()资助
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