Underwater acoustic signal processing method based on adaptive wavelet threshold function

• Main Authors: YANG JIANMIN, XU LINGWEI, LI SHUANG, WANG JINGJING, YU ZEHUI, LIU SHUAI, YANG XINGHAI
• Format: Patent
• Language: Chinese; English
• Published: 05.05.2023
• Subjects: CALCULATING; COMPUTER SYSTEMS BASED ON SPECIFIC COMPUTATIONAL MODELS; COMPUTING; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; PHYSICS

The invention discloses an underwater acoustic signal processing method based on a self-adaptive wavelet threshold function, and belongs to the technical field of ocean information. According to the method, firstly, a bilateral enhanced wavelet threshold function based on an adjustable return-to-zero window is put forward, the bilateral enhanced wavelet threshold function is constructed by using a threshold, oscillation of an existing wavelet threshold function can be eliminated, in the reconstruction process, a wavelet coefficient does not have faults, and stable decomposition and reconstruction of wavelets are ensured; estimating the signal-to-noise ratio of the signal according to the variance of the noisy signal, and adaptively adjusting the parameter of a return-to-zero window according to the signal-to-noise ratio, thereby better eliminating the wavelet coefficient of the noise and improving the denoising performance; and finally, during wavelet coefficient reconstruction, an appropriate threshold funct