Acoustic transient TDOA estimation and discrimination
Bennett, Granger Hart
Therrien, Charles W.
Smith, Kevin B.
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This thesis examines acoustic transient discrimination and Time Difference Of Arrival (TDOA) estimation for the purposes of estimating the position of a submarine in a sonobuoy field. Transient discrimination, for this thesis, is the process of telling different transients apart. Two algorithms are evaluated. One method is based on higher order statistics while the other is based on signal subspace techniques. Extensive simulations using synthetic transients were conducted to establish the performance of each algorithm in terms of discrimination and TDOA estimation. It was found that the bispectral algorithm gave better TDOA estimation at low SNRs while the subspace algorithm gave better TDOA estimation at high SNRs. For discrimination, it was found that the sub space algorithm gave consistent false alarm rates at all SNRs while the false alarm rate for the bispectral algorithm grew with increasing SNR.
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