基于分数阶频率域混合相关的线性调频信号检测与参数估计  

The Detection and Joint Parameters Estimation of LFM Signals Based on a Hybrid Correlation Algorithm on Fractional Frequency Domain

作　　者：李家强[1] 金荣洪[1] 耿军平[1] 范瑜[2] 毛炜[1] 

机构地区：[1]上海交通大学电子工程系,上海200240 [2]常熟理工学院物理与电子科学系,常熟215500

出　　处：《上海交通大学学报》2006年第9期1478-1482,共5页Journal of Shanghai Jiaotong University

基　　金：航天支撑技术基金资助项目(2002-HT-5HJD)

摘　　要：针对线性调频(LFM)信号分数阶傅里叶变换的特性,提出了一种分数阶频率域相关算法.该算法不仅能够在低信噪比条件下对LFM信号进行检测,还能与时间域相关法混合求解,获得包含时延及多谱勒频移参数的信息,实现精确参数估计.在分数阶频率域相关中,不必进行角度的一维及二维搜索,具有简洁、高效的特点.计算机仿真结果表明,该方法是有效的.This paper aims at the linear frequency-modulated （LFM） signal＇s characters of fractional Fourier transform. A new correlation algorithm on fractional frequency domain was proposed, by which not only can the echo LFM signals be detected, but also the Doppler shifts and time delay can be estimated accurately with the correlation on time domain, even for the case of low SNR. Meanwhile, it is not necessary to search the rotated angle in one-dimensional or two-dimensional spaces, so that the algorithm is also simple and of high efficiency. The simulation results show its effectiveness.

关 键 词：线性调频信号 分数阶傅里叶变换 参数估计 

分 类 号：TN953[电子电信—信号与信息处理]