Characteristics of the geometrical scattering waves from underwater target in fractional Fourier transform domain

被引：8

作者：

Li Xiu-Kun ^{[1
,2
]}

Meng Xiang-Xia ^{[1
,2
]}

Xia Zhi ^{[1
,2
]}

机构：

[1] Harbin Engn Univ, Acoust Sci & Technol Lab, Harbin 150001, Peoples R China

[2] Harbin Engn Univ, Coll Underwater Acoust Engn, Harbin 150001, Peoples R China

来源：

ACTA PHYSICA SINICA | 2015年 / 64卷 / 06期

基金：

中国国家自然科学基金;

关键词：

underwater target detection; geometrical scattering waves; fractional Fourier transform; resolution; UNEXPLODED ORDNANCE UXO; ACOUSTIC SCATTERING; CYLINDRICAL-SHELL; SIGNALS; WATER;

D O I：

10.7498/aps.64.064302

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The components of the underwater target scattering waves alias together in time domain and frequency domain realistically. They are affected by the incident angle, and show great differences under different angles. It is necessary to build an analytical model of scattering waves under all-direction incident angles theoretically. The analytical expressions of geometrical scattering components changing with the incident angle in fractional Fourier transform domain are deduced in this paper. The all-direction model in optimal fractional Fourier transform domain of the scattering waves is built. Based on this, the geometrical feature of underwater target echo is provided. In addition, the relationships between the resolution and the bandwidth of transmitted signal, and between the calculation accuracy and the length of observational signal are given. By processing experimental data, it is indicated that the model in fractional Fourier transform domain is in accordance with the characteristics of underwater target. It can provide a theoretical basis for target recognition under unknown incident angle.

引用

页数：12

共 27 条

[1] THE FRACTIONAL FOURIER-TRANSFORM AND TIME-FREQUENCY REPRESENTATIONS [J].