一种低信噪比下线性调频信号回波时延高分辨估计新方法  

A Novel Method for High Resolution Time Delay Estimation of LFM Signal Echoes

作　　者：刘晟[1] 向敬成[1] 

机构地区：[1]电子科技大学电子工程学院,成都610054

出　　处：《电子学报》1998年第9期51-54,共4页Acta Electronica Sinica

摘　　要：本文以雷达距离域超分辨应用为例，研究了基于高分辨阵列处理算法的线性调频信号重叠回波时延高分辨估计技术首先，针对线性调频信号提出了一种信号增强算法用于回波信号的预处理，以有效地降低超分辨处理适用的信噪比门限.为了解决不同目标速度接近时造成的目标回波强相关甚至相干给回波分辨带来的困难，讨论了基于叛域逆滤波获得等效复谐波序列，并运用ROOR－WSF算法进行超分辨处理的实现问题计算机模拟表明，本文方法可在低信噪比下实现多目标距离超分辨估计，克服了现有方法在信噪比门限、回波相干性及计算量等方面的限制．The problem of high resolution echoes time delay estimation for large time-bandwidth preduct LHM signals is investigated. A novel algorithm based on FFT for LFM signals enhancement used for preprocessing to raise the effective signal-to-noise ratio (SNR) is presented. In Order to overcome the redution difficulty in the case that echoes are highly correlated or coherent, ROOT-WSF algorithm is applied by use of inverse filtering in signal bandwidth. Finally, simulation results are included to demonstrate the improved perfornmnce achieved by the proposed method.

关 键 词：线性调频 信号增强 ROOT-WSF算法 雷达信号处理 

分 类 号：TN957.51[电子电信—信号与信息处理]