物理学报Issue(6)：1-12,12.DOI:10.7498/aps.64.064302
水下目标几何声散射回波在分数阶傅里叶变换域中的特性∗
Characteristics of the geometrical scattering waves from underwater target in fractional Fourier transform domain
摘要
Abstract
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.关键词
水下目标探测/几何声散射分量/分数阶傅里叶变换/分辨力Key words
underwater target detection/geometrical scattering waves/fractional Fourier transform/resolution引用本文复制引用
李秀坤,孟祥夏,夏峙..水下目标几何声散射回波在分数阶傅里叶变换域中的特性∗[J].物理学报,2015,(6):1-12,12.基金项目
国家自然科学基金(批准号:51279033)和黑龙江省自然科学基金(批准号：F201346)资助的课题.* Project supported by the National Natural Science Foundation of China (Grant No.51279033) and the Natural Science Foundation of Heilongjiang Province, China (Grant No. F201346) （批准号:51279033）
