一种基于改进AMDF的时延估计方法

两路传感器接收信号的时延估计是时间到达差(TDOA)定位中需要解决的首要问题。多途效应是影响时延估计性能的重要因素。提出一种基于改进平均幅度差函数（AMDF）的时延估计方法，通过对信号进行多帧延拓与叠加，提高对多途效应的抑制能力。同时，结合广义互相关方法降低算法的噪声敏感性。仿真结果表明，该算法时延估计结果与传统方法相比具有更小的误差和更高的稳定性。

Research on Time Delay Estimation Based on Modified AMDF Method

The time delay estimation of signals received at two sensors is the first step in time difference of arrival(TDOA) location. Multi path effect is the key factor affecting the performance of the time delay estimation of the sound source signal. Traditional methods are difficult to overcome the effects of multi path. A time delay estimation method based on generalized weighted average magnitude difference function(AMDF) was proposed. The multi path effects can be suppressed by the modified AMDF method. The generalized weighted function can be used to reduce the noise sensitivity of the algorithm. Simulation results show that, with reduced error and improved stability, the performance of proposed method is better than that of the traditional generalized cross correlation method.