自适应滤波器在时延估计中的应用——广义二次内插时延估计法

Application of adaptive filter in time delay estimation——generali-zed quadratic interpolation method

两个或多个接收信号之间的延时估计问题在许多工程应用中具有重要的意义。本文提出一种在接收信号的统计特性的先验知识了解甚少,或不了解的情况下,仍能准确地估计出接收信号间时延的方法,并推导了这一估计的方差。该方法是基于自适应噪声抵消器,在其收敛时,用权系数进行内插估计,与传统的用采样函数内插不同,本方法对F.A.Reed等人提出的二次内插法进行了改进,保证了估计精度,在实现上也比较简单。计算机模拟实验与海上实验结果与理论上的分析是一致的。

The time delay estimation (TDE) of two different received signals from the same source has attracted many interests of researchers in the field of signal processing. A method described for precisely estimating time delay in this paper is based on the assumption that little priori knowledge on statistical characteristics is available for the received signal. The variance of the estimate is derived. The basic architecture of this method is to use the adaptive noise canceller, in the steady state, and to interpolate the weight coefficients by using a generalized quadratic interpolation martrx. The formula of the time delay estimate is presente. The method proposed by F.A. Reed is a special case of this method. The hardware implementation is much easier than that of the conventional time delay estimation method. The results of the system simulation and the experimental results at sea show a good agreement with the theoretical analysis