锯齿波线性调频连续波信号的检测与参数估计  

Detection and parameter estimation of sawtooth linear frequency modulated continuous wave signal

作　　者：朱文涛[1] 郑纪彬[1] 苏涛[1] 朱凯然[1] 

机构地区：[1]西安电子科技大学雷达信号处理国家重点实验室,陕西西安710071

出　　处：《西安电子科技大学学报》2013年第2期110-116,共7页Journal of Xidian University

基　　金：国家自然科学基金资助项目(61001204)

摘　　要：针对长时间积累较难在线性调频连续波信号的检测和参数估计中应用的问题,提出一种联合零频搜索方法与基于循环相关的类运动目标检测(MTD)方法的锯齿波线性调频连续波信号检测与参数估计的算法.首先采用零频搜索方法实现了锯齿波线性调频连续波信号的检测与周期的估计,然后利用基于循环相关的类MTD方法估计信号的相位参数和起始时间.该方法可有效地估计周期、调频率、初始频率和起始时间,其计算复杂度低,且由于采用长时间积累方式,在低信噪比条件下具有较好的估计性能.计算机仿真验证了该方法的有效性.Aiming at application of long time accumulation for the detection and parameter estimation of linear frequency modulated continuous wave （LFMCW）, a novel method based on the joint zero frequency searching method and quasi-MTI） method is proposed to detect the sawtooth I,FMCW （SLFMCW） signal and estimate its parameters. Firstly, detection of the SLFMCW signal and estimation of its period are realized by use of the zero frequency searching method. And then, the quasi-MTD method based on cyelocorrelation is utilized to finish the estimation of phase parameters and initial time-offset. The estimation of the period, chirp-rate, initial frequency and initial time-offset can be effectively realized by the method, which has low computational complexity and can provide good estimation performance in a low signal-to-noise ratio （SNR） owing to long time accumulation. Computer simulations verify the effectiveness of the algorithm.

关 键 词：锯齿波线性调频连续波 信号检测 参数估计 循环相关 

分 类 号：TN957.51[电子电信—信号与信息处理]