The key technology of it is passive ranging, while the key of ranging is the high precise time delay estimation, which is the main factor that restricts the precision of ranging.

A novel multi-source time delay estimation method based on CZT and covariation spectrum;

Estimate array shape based on time delay estimation;

Time delay estimation and the twin-line arrays port/starboard discrimination;

Analysis of multi-path channel effect on time-delay estimation in positioning system;

Get sound arrival time-delay estimation of the array element by the virtual instrument in sound source localization

To solve the difficulty of time-delay estimation for non-stationary signal,an improved estimation method based on short-time Fourier transform(STFT) spectrogram correlated with frequency domain is presented.

Because high order statistics has the virtue of depressing gauss noise, this paper uses bispectrum as the mathematics tool of Chirp signal time delay estimation in pretreatment of controlled vibrator shallow layer seismic exploration data.

In this paper,the methods for estimation of the time delay of a passive acoustic detection system are summarized and the advantages and disadvantages of existent methods on estimation of time delay are analyzed.

By associating all time delays among two microphones of the array , parameters of position of multiple sources can be uniquely d.

A novel blind joint angle and delay estimation method;

Optimized Matching MMSE Delay Estimation Algorithms in DS-CDMA System;

Blind joint angle and delay estimation method in uniform circular array;