基于分数阶傅里叶变换的线性调频信号二维波达方向估计

2-D DOA Estimation of LFM Signals Based on Fractional Fourier Transform

本文提出了一种基于分数阶傅里叶变换(Fractional Fourier Transform,FRFT)的多线性调频(Linear Frequency Modulation,LFM)信号二维波达方向(Direction of Arrival,DOA)估计方法.该方法利用FRFT对LFM信号的能量聚集特性,构造出一种新的分数阶傅里叶域的阵列信号数据模型,并利用MUSIC算法实现对多个LFM信号的二维DOA估计.仿真实验验证了算法的有效性.

A new method to estimate 2-D DOA of multiple LFM signals is proposed.Based on a fact that the LFM signal has the energy-concentrated performance in the fractional Fourier transform domain （FRFD）, a novel array data model in FRFD is constructed, MUSIC algorithm is then applied on correlation matrix in FRFD to obtain the 2-D DOA estimation of multiple LFM sources. The simulation results verified the efficiency of the new method.