Title :
Correlation among time difference of arrival estimators and its effect on localization in a multipath environment
Author :
Yuan, Y. Xiang ; Carter, G. Clifford ; Salt, J. Eric
Author_Institution :
Dept. of Electr. Eng., Saskatchewan Univ., Saskatoon, Sask., Canada
Abstract :
A generalized covariance expression for time difference of arrival (TDOA) estimators is derived for an M-sensor arbitrary array in a two-path underwater environment. The resulting expression can be reduced to the variance and covariance expressions developed previously. The correlation among the time difference of arrival estimators and its effect on the localization error are investigated for a two-sensor vertical array. The results show that the correlation among the multipath TDOA estimators is significant and the degree of correlation depends on the power spectral density of the source signal and that of the noise, and only on two multipath TDOAs. Because of this correlation, every TDOA estimate contributes information to the localization and therefore a whole set of TDOA estimators should be used
Keywords :
array signal processing; covariance analysis; multipath channels; parameter estimation; spectral analysis; underwater sound; correlation; covariance; localization error; multipath TDOA estimators; multipath environment; noise; power spectral density; sensor array; source signal; time difference of arrival estimators; two-path underwater environment; two-sensor vertical array; variance; Acoustic noise; Acoustic sensors; Autocorrelation; Bibliographies; Delay effects; Oceans; Sea surface; Sensor systems; Time difference of arrival; Underwater acoustics;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1995. ICASSP-95., 1995 International Conference on
Conference_Location :
Detroit, MI
Print_ISBN :
0-7803-2431-5
DOI :
10.1109/ICASSP.1995.479556
