DOA Estimation of Near-field Passive Sources with Acoustic Array Based on Fractional Fourier Transform

被引：0
|
作者：
Qiu, Wei [1 ]
Wang, Wenke [1 ]
Xiao, Wenbin [1 ]
机构：
[1] Natl Univ Def Technol, Coll Meteorol & Oceanol, Changsha 410073, Hunan, Peoples R China
来源：
OCEANS 2018 MTS/IEEE CHARLESTON | 2018年
基金：
中国国家自然科学基金;
关键词：
DOA estimation; near-filed source; uniform linear array; Fractional Fourier transform; LOCALIZATION;
D O I：
暂无
中图分类号：
U6 [水路运输]; P75 [海洋工程];
学科分类号：
0814 ; 081505 ; 0824 ; 082401 ;
摘要：
In this paper, we propose an efficient near-field source DOA estimation method based on the Fractional Fourier transform. In this method, the received data of the sensor array for the near-field source is modeled as a linear-frequencymodulated (LFM) signal in spatial domain after the Fresnel approximation. Then the Fractional Fourier transform is employed to estimate the modulated frequency rate, which stands for the influence of quadratic phase of near-field source. After compensating this quadratic phase term, the received signal can subsequently be converted into a far-field expression. Finally, classical DOA estimation methods for far-field can be applied to find the direction of the source. In addition, for multiple sources, a CLEAN technique is proposed to extract the sources iteratively. Simulations are finally carried out to demonstrate its validity.
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页数：4
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