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《Application of Electronic Technique》 2012-08
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Ultrasonic nondestructive signals processing based on sparse decomposition

Chen Baoli1,Chen Yu2,Zhang Yuefei1,Zhang Zhijie1 (1.College of Information and Communication Engineering,North University of China,Taiyuan 030051,China;2.College of Mechanical and Electrical Engineering,North University of China,Taiyuan 030051,China)  
In order to improve the effect of recognition when background noise is strong and complex,a new method is proposed for ultrasonic signals processing.Based on sparse decomposition with Gabor dictionary,signal is equated with linear combination of several Gabor atoms in this method.Take the coherent ratio threshold as iteration termination condition,the iteration times vary with the noise level adaptively.Adaptive genetic algorithm was introduced to matching pursuit,which make computation speed improved greatly.Experiments show that this method is efficient and stable,and can effectively reduce the influence of the noise.
【CateGory Index】: TN911.72
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