NDLI: Array Modeling of Active Sonar Clutter

Content Provider	IEEE Xplore Digital Library
Author	Abraham, D.A.
Copyright Year	2007
Description	Author affiliation: CausaSci LLC, Arlington (Abraham, D.A.)
Abstract	Active sonar systems operating in shallow water environments often deal with excessive false alarms, generically referred to as clutter, that are more numerous than expected for Rayleigh distributed reverberation. It is known that the clutter probability density function, and therefore the probability of false alarm $(P_{falpha}),$ depends on the scattering sources, propagation conditions, sonar system and signal processing. In this paper the effect of sonar array processing on clutter statistics is evaluated through approximation by the K distribution where the shape parameter (alpha tilde) provides an inverse relationship to $P_{falpha}$ with decreases in alpha tilde representing an increase in $P_{falpha}.$ When the transmit waveform bandwidth is narrowband with respect to the array processing and propagation is restricted to the direct path, a was found to be separable into the product of an array-processing effect, a transmit-waveform effect, and a clutter-source scattering effect. The array effect was found to coarsely follow the array beamwidth, although precise evaluation is straightforward given the array beampattern and, for an equi-spaced line array, an asymptotic approximation was seen to be quite accurate for even moderate array sizes. As might be expected, array design or processing that tends to increase the beamwidth (e.g., reducing the size of an array or transmit waveform frequency, steering away from broadside to a line array, or shading an array to reduce sidelobes) was found to increase alpha tilde. Uniform shading was found to provide a practical, though not exact, lower bound on alpha tilde for common array shading functions.
Starting Page	1
Ending Page	7
File Size	4773288
Page Count	7
File Format	PDF
ISBN	9780933957350
DOI	10.1109/OCEANS.2007.4449244
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-09-29
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	MTS
Subject Keyword	Sonar Array signal processing Rayleigh scattering Reverberation Probability density function Statistical distributions Shape Bandwidth Narrowband Process design
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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