线性调频连续波信号检测与参数估计算法  

Detection and Parameter Estimation of Linear Frequency Modulation Continuous Wave Signal

作　　者：朱文涛[1] 苏涛[1] 杨涛[1] 郑纪彬[1] 张龙[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,西安710071

出　　处：《电子与信息学报》2014年第3期552-558,共7页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(61001204);陕西省自然科学基础研究计划项目(2012JM8015);陕西省教育厅专项计划项目(12JK0530;12JK0557);中国博士后科学基金(2013M542329)资助课题

摘　　要：针对长时间积累的方法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,该文基于归一化变窗长相干平均法,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。该方法首先利用归一化变窗长相干平均法实现噪声方差的一致性,然后在此基础上利用帧间相关法实现周期的精确估计,最后利用循环平稳法估计信号的相位参数。该算法以较低的计算复杂度实现信号的长时间积累,在低信噪比条件下具有较好的估计性能。仿真结果验证了该方法的有效性。To deal with the issue that the long time accumulation method is hard to be applied to the detection and parameter estimation of Linear Frequency Modulated Continuous Wave （LFMCW） signal, a novel algorithm combining the joint inter-frame correlation method and cyclostationary method is proposed to detect LFMCW signal and estimate its parameters. Firstly, consistency of noise variance is completed by the normalized window-variant coherent average method. Then, on this basis, the period is exactly estimated with inter-frame correlation method. Finally, cyclostationary method is utilized to estimate the phase parameters of LFMCW signal. The proposed algorithm realizes long time accumulation with low computational complexity. For low Signal-to-Noise Ratio （SNR）, this method still achieves good estimation performance. Simulation results verify the effectiveness of the proposed method.

关 键 词：信号检测 参数估计 线性调频连续波信号 归一化变窗长相干平均 帧间相关 循环平稳 

分 类 号：TN957.51[电子电信—信号与信息处理]