Characteristic Analysis of Underwater Acoustic Scattering Echoes in the Wavelet Transform Domain  

作　　者：Mei Yang Xiukun Li Yang Yang Xiangxia Meng 

机构地区：[1]Acoustic Science and Technology Laboratory, Harbin Engineering University, Harbin 150001, China [2]College of Underwater Acoustic Engineering, Harbin Engineering University, Harbin 150001, China

出　　处：《Journal of Marine Science and Application》2017年第1期93-101,共9页船舶与海洋工程学报（英文版）

基　　金：Foundation item： Supported by the National Natural Science Foundation of China（Grant No.51279033） and Natural Science Foundation of Heilongjiang Province, China（Grant No.F201346 ）

摘　　要：Underwater acoustic scattering echoes have time–space structures and are aliasing in time and frequency domains. Different series of echoes properties are not identified when incident angle is unknown. This article investigates variations in target echoes of monostatic sonar to address this problem. The mother wavelet with similar structures has been proposed on the basis of preprocessing signal waveform using matched filter, and the theoretical expressions between delay factor and incident angle are derived in the wavelet domain. Analysis of simulation data and experimental results in free-field pool show that this method can effectively separate geometrical scattering components of target echoes. The time delay estimation obtained from geometrical echoes at a single angle is consistent with target geometrical features, which provides a basis for object recognition without angle information. The findings provide valuable insights for analyzing elastic scattering echoes in actual ocean environment.

关 键 词：underwater acoustic scattering echoes geometrical scattering components time delay estimation wavelet transform 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术] TJ610.2[自动化与计算机技术—计算机科学与技术]