一、引言精确估计两个或两个以上的转换器处接收信号之间的延迟在许多信号处理的工程应用中有重要作用。在过去的几年里,提出并实现了许多时间延迟估计的方法,其中包括包络互相关函数,单位脉冲响应计算,平滑相干变换,最大似然估计等,这在或其它文献中有所综述。总的目的都是减小接收机处有统计独立噪声时所得时间延迟估计的方差(随机误差)。 I. INTRODUCTION Precisely estimating the delay between received signals at two or more converters plays an important role in many engineering applications for signal processing. In the past few years, many time delay estimation methods have been proposed and implemented, including envelope cross-correlation function, unit impulse response calculation, smooth coherent transformation, maximum likelihood estimation and so on, which are reviewed in other literature . The overall goal is to reduce the variance (random error) of the estimate of the time delay obtained when there is statistical independent noise at the receiver.