低信噪比下线性调频连续波信号的参数估计  

Parameter estimation of linear frequency modulated continuous wave signal in low SNR

作　　者：朱文涛[1] 苏涛[1] 杨涛[1] 郑纪彬[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：《电波科学学报》2013年第6期1158-1164,共7页Chinese Journal of Radio Science

基　　金：国家自然科学基金青年科学基金(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,提出一种联合帧间相关法与循环平稳法的线性调频连续波信号检测与参数估计算法.利用帧间相关法实现信号的检测和周期的精确估计,利用循环平稳法完成信号相位参数的估计.该算法以较低计算复杂度实现信号的长时间积累,解决了起始时间给信号检测和参数估计带来的问题,在低信噪比条件下具有较好的估计性能.仿真结果验证了方法的有效性.Considering application of long time accumulation to the detection and parame ter estimation of linear frequency modulated continuous wave （LFMCW） signal, a novel method based on the joint inter-frame correlation method and cyclostationary method is proposed to detect LFMCW signal and estimate its parameters. Firstly, signal detection and exact period estimation is realized by inter-flame correlation method. And then, cy clostationary method is utilized to finish the phase parameters estimation of LFMCW sig nal. The algorithm realizes long time accumulation with low computational complexity and solves the problem brought by initial time-offset. On the low signal-to-noise ratio （SNR） condition, this method still has better estimation performance. Simulations verify the ef fectiveness of the method.

关 键 词：信号检测 参数估计 线性调频连续波信号 帧间相关 循环平稳 

分 类 号：TN957.51[电子电信—信号与信息处理]