基于HHT时频图的时延估计方法

Time Delay Estimation Based on HHT Time-frequency Representation

时延估计方法主要有广义相关法、相位数据法以及自适应时延估计法等。对于水中爆炸冲击波这种瞬态、非平稳信号的时延估计,常用的时延估计方法存在一定的误差。针对爆炸冲击信号的特征,利用HHT变换在处理非平稳信号的优势,提出了一种基于希尔伯特黄时频图的时延估计方法。该方法首先将信号进行EMD分解,然后得出爆炸信号的时频图,最后根据时频图中能量最大的频率所对应的时间得出时延估计。仿真实验表明,该方法能够有效、精确地对爆炸冲击信号进行时延估计。

In time delay estimation（TDE）,cross-relation,phase position and LMS are generally used.However,the normally used method has some shortages in processing with transient and non-stationary signals such as underwater explosive signal.Focusing on the characters of explosive shock wave,this paper,utilizing the advantages of HHT in processing non-stationary signals,proposed a method based on HHT time-frequency representation to estimate the time delay.By EMD with the signals,this method get the time-frequency representation of explosive signals,and the get the time delay from that representation.The simulation shows that this method is effective and accuracy in analyzing the time-frequency information of explosive shock wave signal.