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Correlation among time difference of arrival estimators and its effect on localization in a multipath environment

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3 Author(s)
Y. Xiang Yuan ; Dept. of Electr. Eng., Saskatchewan Univ., Saskatoon, Sask., Canada ; G. C. Carter ; J. E. Salt

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

Published in:

Acoustics, Speech, and Signal Processing, 1995. ICASSP-95., 1995 International Conference on  (Volume:5 )

Date of Conference:

9-12 May 1995