基于双通道DFRFT互谱法的Chirp信号时延估计  

Time Delay Estimation of Chirp Signals Based on Double-Channel DFRFT Cross-Spectrum

作　　者：李昕[1,2] 

机构地区：[1]北京理工大学信息与电子学院,北京100081 [2]安徽理工大学电气与信息工程学院,安徽淮南232001

出　　处：《电子学报》2014年第6期1068-1073,共6页Acta Electronica Sinica

基　　金：安徽省优秀青年人才基金项目(No.2012SQRL052);安徽省高校省级科学研究项目(No.KJ2013Z064)

摘　　要：针对脉冲Chirp类信号的时延估计问题,理论推导了基于离散分数阶Fourier变换的脉冲Chirp信号的特性,分析了当时延参量等效的分数阶Fourier域的频率大于采样率时,脉冲Chirp信号的分数阶Fourier域谱产生混叠,造成时延估计模糊的问题,并提出基于离散分数阶Fourier变换(DFRFT)双通道互谱法进行时延估计,给出两个通道采样率选取的原则及算法的性能分析,实验结果表明,在一定的采样率下,算法能够快速精确地估计脉冲Chirp信号的时延参数.For the problem of time-delay estimation for Chirp pulse signals ,the characteristics of Chirp pulse signals based on the discrete fractional Fourier transform was theoretically derived .When time-delay equivalent frequency parameter was greater than the sampling rate in fractional Fourier domain ,the spectrum of Chirp pulse signals in fractional Fourier domain produced aliasing , which caused the delay estimation ambiguity problem .In order to solve this problem ,the time-delay estimation of Chirp signal based on double-channel DFRFT cross-spectral method was proposed ,then the principles of the two-channel sampling rate selection and the performance analysis was given .The experimental results show that ,in a certain sampling rate ,the proposed algorithm is able to quickly and accurately estimate the time-delay parameters of Chirp pulse signals .

关 键 词：离散分数阶Fourier变换(DFRFT) 互谱 时延估计 脉冲chirp信号 

分 类 号：TN957.51[电子电信—信号与信息处理]