CONSTRAINED TIME DELAY ESTIMATION FOR PASSIVE SONAR: AN INVESTIGATION TO ASSESS THE PRACTICALITY AND ADVANTAGE OF USING A CONSTRAINED APPROACH TO TIME DELAY ESTIMATION FOR BEARING DETERMINATION OF UNDERWATER ACOUSTIC SOURCES

Authors
  1. Pasupathy, S.
  2. Krolik, J.
  3. Eizenman, M.
Corporate Authors
Toronto Univ, Toronto ONT (CAN) Dept of Electrical Engineering;Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
Accurate time delay measurement is crucial for effective bearing estimation in passive sonar systems. In spatially uncorrelated ambient noise, generalized correlation (GC) methods can provide uniformly minimum variance unbiased delay estimates from two sensor outputs by convolving the estimated cross-correlation function with an optimal weighting function. Direct estimation of the optimal weighting function from a finite time observation of the received data, however, can cause excessively large delay estimation errors. In this report, both conventional and adaptive filtering GC implementations are shown to offer similar sub-optimal delay estimation performance in the absence of a priori knowledge of the processor input statistics. Constrained time delay estimation is presented as an alternative technique which avoids direct estimation of the receiver input statistics. TRUNCATED
Date of publication
15 Aug 1984
Number of Pages
181
DSTKIM No
85-00057
CANDIS No
44897
Format(s):
Hardcopy;Originator's fiche received by DSIS

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