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

• Published in: Journal of marine science and application 2017-03, Vol.16 (1), p.93-101
• Main Authors: Yang, Mei, Li, Xiukun, Yang, Yang, Meng, Xiangxia
• Format: Article
• Language: English
• Subjects: Acoustic scattering; Aerospace environments; Aliasing; Delay; Echoes; Elastic scattering; Electrical Machines and Networks; Engineering; Frequency domain analysis; Geotechnical Engineering & Applied Earth Sciences; Machinery and Machine Elements; Marine environment; Object recognition; Offshore Engineering; Power Electronics; Preprocessing; Simulation; Spacecraft; Time lag; Underwater; Underwater acoustics; Wavelet analysis; Wavelet transforms; 几何散射; 回波特性; 声散射; 小波变换域; 时-空结构; 时间延迟估计; 水声; 目标回波信号
• ISSN: 1671-9433; 1993-5048
• DOI: 10.1007/s11804-017-1398-6

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.