### ASA 128th Meeting - Austin, Texas - 1994 Nov 28 .. Dec 02

## 3pUW1. Calculation of a source spectrum using matched-field tracking.

**Homer Bucker
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*Code 541, NRaD, NCCOSC, San Diego, CA 92152
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An underwater acoustic source can be detected by finding the best match
between a measured set of covariance matrix elements and those calculated for
possible tracks [H. Bucker, ``Matched-field tracking in shallow water,'' J.
Acoust. Soc. Am. (to be published)]. Let (g[sub lft]) be the measured elements
and (g[sub lft]) be the elements calculated for the best track of a unit
source. Here, index l refers to a pair of sensors, f to a frequency bin, and t
is for different times. Then a plot of S(f,t)=(summation)[sub l]g[sub
lft]/(summation)[sub l]g[sub lft] is a Lofargram in which the effects of the
multipath propagation have, at least in part, been removed. Of course, the
success of the deconvolution depends upon the accuracy of the propagation model
and contamination of other sound sources. Several examples will be presented to
illustrate the method.