基于分数阶傅里叶变换的宽带Chirp信号的波达方向角估计

doi:10.7964/jdxbgxb201403038

吉林大学学报(工学版) ›› 2014, Vol. 44 ›› Issue (3): 818-821.doi: 10.7964/jdxbgxb201403038

基于分数阶傅里叶变换的宽带Chirp信号的波达方向角估计

杨巍^1,2,石要武²

1.吉林大学汽车仿真与控制国家重点实验室,长春130022;
2.吉林大学通信工程学院,长春 130022

收稿日期:2012-08-28 出版日期:2014-03-01 发布日期:2014-03-01
通讯作者: 石要武(1954),男,教授,博士生导师.研究方向:信号处理与检测控制.E-mail:shiyw@jlu.edu.cn E-mail:weiyang09@mails.jlu.edu.cn
作者简介:杨巍(1983),女,博士研究生.研究方向:阵列信号处理.E-mail:weiyang09@mails.jlu.edu.cn
基金资助:
国家自然科学基金项目(51075175).

Broadband direction-arrival estimation of Chirp signal using fractional Fourier transform

YANG Wei^1,2,SHI Yao-wu²

1.State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130022,China;
2. College of Communication Engineering, Jilin University, Changchun 130022,China

Received:2012-08-28 Online:2014-03-01 Published:2014-03-01

摘要/Abstract

摘要： 利用分数傅里叶变换(Fractional Fourier transform,FRFT)时频面旋转的特性,将Chirp信号的能量集中,并在分数阶傅里叶域内接收含宽带Chirp信号参数的方向矩阵,然后再通过窄带DOA(Direction of arrival)算法进行波达方向角估计。理论分析和仿真试验证明了该算法的有效性,并且很大程度地提高了信噪比。

关键词: 信息处理技术, Chirp信号, 波达方向角, 分数阶傅里叶变换

Abstract: We consider the problem of estimating the Directions of Arrival (DOA) of broadband Chirp signal sources using a sensor array. Since the Fractional Fourier Transform (FRFT) can rotate the time-frequency plane, the frequencies of Chirp signals are concentrated by a properly chosen rotational angle, and the direction array is also obtained in FRFT domain. By this way, the broadband DOAs estimation is then successfully processed using the well existing narrowband DOA estimation algorithms. Simulation results demonstrate that the proposed method is quite simple and has much better performance compared to the methods such as the Coherent Signal Subspace method.

Key words: information processing technology, Chirp signal, direction of arrival(DOA), fractional Fourier transform(FRFT)

中图分类号:

TN911.7

杨巍,石要武. 基于分数阶傅里叶变换的宽带Chirp信号的波达方向角估计[J]. 吉林大学学报(工学版), 2014, 44(3): 818-821.

YANG Wei,SHI Yao-wu. Broadband direction-arrival estimation of Chirp signal using fractional Fourier transform[J]. 吉林大学学报(工学版), 2014, 44(3): 818-821.

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基于分数阶傅里叶变换的宽带Chirp信号的波达方向角估计

Broadband direction-arrival estimation of Chirp signal using fractional Fourier transform

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