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Optical Engineering

Two-Dimensional Optical Processing Of One-Dimensional Acoustic Data
Author(s): Harold H. Szu
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Paper Abstract

The concept of carrier-mean-frequency-selective convolution is introduced to solve the undersea problem of passive acoustic surveillance (PAS) and compared with the conventional notion of difference-frequency Doppler-corrected correlation. The former results in the cross-Wigner distribution function (WD), and the latter results in the cross-ambiguity function (AF). When the persistent time of a sound emitter is more important than the characteristic tone of the sound emitter, WD will be more useful than AF for PAS activity detection, and vice versa. Their mutual relationships with the instantaneous power spectrum (IPS) show the importance of the phase information that must be kept in any 2-D representation of a 1 -D signal. If a square-law detector is used, or an unsymmetric version of WD or AF is gener-ated, then one must produce the other 2-D representations directly, rather than transform one to the other.

Paper Details

Date Published: 1 October 1982
PDF: 10 pages
Opt. Eng. 21(5) doi: 10.1117/12.7972986
Published in: Optical Engineering Volume 21, Issue 5
Show Author Affiliations
Harold H. Szu, Naval Research Laboratory (United States)


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