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

作　　者：杨巍[1,2] 石要武[2] 

机构地区：[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

出　　处：《吉林大学学报（工学版）》2014年第3期818-821,共4页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(51075175)

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。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.

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 

分 类 号：TN911.7[电子电信—通信与信息系统]