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   -> Volume 4, Issue 7

Program: Time-Frequency/Scale Analysis for Navy Applications (ONR)
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Lake, Douglas (

PostPosted: Tue Dec 03, 2002 1:22 pm    
Subject: Program: Time-Frequency/Scale Analysis for Navy Applications (ONR)
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Program: Time-Frequency/Scale Analysis for Navy Applications (ONR)

Time-Frequency / Time-Scale Analysis for Navy Applications

The Office of Naval Research is pleased to announce a new initiative in
the area of time-frequency and time-scale analysis. For stationary
signals, short time Fourier transforms (STFT) or spectrograms have been
used successfully by the Navy for many years for signal analysis. Time-
frequency distributions have been shown to be effective representations
for certain classes of nonstationary signals (e.g., chirp signals). Wavelet
analysis techniques perform well in isolating features of nonstationary
signals that occur at multiple scales and/or are compactly supported in
time. These current time-frequency and time-scale analysis approaches
have had mixed success with applications (i.e., real data) in the presence
of noise and/or with signals composed of diverse multiple components.

The objective of the initiative is to develop a unifying and
mathematically rigorous theory of time-frequency analysis and apply
new time-frequency techniques and methodologies to nonstationary,
multiple component, noisy signals that occur in high priority Navy
applications. Time-frequency analysis theory embodies both
distributional and wavelet approaches and can be embedded and
understood in mathematical frameworks utilizing statistical, operator-
theoretic, and group theoretic methods (among others). Applications of
interest include radar imaging (e.g., ISAR), vibrational and motor
current analysis for mechanical diagnostics, and the classification of
underwater mines from acoustic backscatter. Optimal and
computationally efficient time-frequency processing (vice FFT) is
needed for radar imaging to increase resolution for maneuvering (time-
varying Doppler) targets. Time-frequency energy representations
(preferably positive) are needed to isolate and characterize mechanical
faults that occur in both time and frequency. Time-frequency analysis
is needed to identify and extract nonstationary components (e.g.,
specular echo, resonant frequencies, etc.) from an acoustic response that
discriminate mines from clutter (e.g. rocks).

Interested parties are encouraged to submit short (5 pages) technical
white papers to ONR describing their research by September 30, 1995
for initial evaluation. Selected authors will be encouraged to submit
formal proposals by March 31, 1996. Successful proposals will be
funded starting October 1, 1996. Submit technical material to and for
additional information please contact:

Dr. Douglas E. Lake
Program Officer, Signal and Image Analysis
Surveillance, Communications and Electronic Combat Division
Office of Naval Research, Code 313
Arlington, VA 22217-5660 USA
703-696-6567 (Voice)
703-696-1331 (Fax)
All times are GMT + 1 Hour
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