基于最小能量泄漏的时延估计法  

Time Delay Estimation Methods Based on the Smallest Energy Leakage

作　　者：梅秀庄[1] MEI Xiu-zhuang(Mechanical College,Inner Mongolia University of Technology,Hohhot Inner Mongolia 010051)

机构地区：[1]内蒙古工业大学机械学院,内蒙古呼和浩特010051

出　　处：《数字技术与应用》2018年第1期73-75,共3页Digital Technology & Application

摘　　要：时延估计(TDE)是阵列信号处理中的一项关键技术,其目的是估计出同源信号到达不同传感器时,由于传输距离不同而引起的时间差。广义互相关法是应用最广泛的TDE算法之一,因其抗噪性能较弱,其应用受到了一定限制。当信号为非周期或随机信号时,TDE精度与互相关运算所采用的数据长度有关,长度越长,其精度越高,但其计算量也越大。本文首先采用最小能量泄漏准则,对两信号最小泄漏信号长度进行估计,使参与后续运算的数据最具有代表性,之后构建能量相关系数函数,形成了基于最小能量泄漏的时延估计法。最后通过实验仿真分析,与广义互相关时延估计法进行对比,得出该方法具有较高的时延估计精度和很强的抗噪性。Time delay estimation(TDE)is one of the key techniques in the array signal processing.TDE is used to derive the time difference of signal propagation from the source to the spatially separated sensors.Generalized cross correlation(GCC)method is one of the popular TDE algorithms,which is used limitedly for weak Anti-noise capability.On condition that aperiodic or random signal is processed,TDE accuracy and Signal Size correlate.Theoretical analysis showed that accuracy is better and computation is more if Signal Size is longer.This paper proposes a criterion of the smallest energy leakage,and estimates size of two signals on condition of smallest energy leakage.Then this paper proposes energy correlation coefficient function and TDE methods based on the smallest energy leakage.The experimental results of typical signals indicate that anti-noise capability and precision is enhanced,as compared with GCC method.

关 键 词：时延估计 能量泄漏 信号长度 抗噪性 

分 类 号：TN911[电子电信—通信与信息系统]