NDLI: A portable, self-contained, 5MSa/s data acquisition system for broadband, high frequency acoustic beamforming

Content Provider	IEEE Xplore Digital Library
Author	Koay Teong Beng Tan Eng Teck Potter, J.R.
Copyright Year	2002
Description	Author affiliation: Acoust. Res. Lab., Nat. Univ. of Singapore, Singapore (Koay Teong Beng; Tan Eng Teck; Potter, J.R.)
Abstract	Understanding the spatial and temporal structure of ambient noise is a critical factor for estimating the performance of active and passive sonar systems. This is especially true in warm shallow waters where snapping shrimp dominate the ambient noise spectrum over 6 octaves. Snapping shrimp sources can be problematic for active sonar, but are key sources for Ambient Noise Imaging systems. The impulsive nature of snapping shrimp sounds permits the use of a sparse array to beamform on the source, providing each of several channels is sampled at a sufficiently high rate, perhaps 200 kSa/s or higher. If four channels are used to sample hydrophones placed at the vertices of a tetrahedral array in shallow water, the resulting 3-D aperture can be used to estimate the source direction in azimuth and elevation. In general, the altitude of the array will be known, and if the sources are snapping shrimp, they must lie on or very near the seabed. Thus the range may also be deduced and the spatial/temporal source distribution mapped. A second motivation for designing a compact high-frequency data acquisition system was to study dolphin echolocation. The system we have designed and built is based on COTS components.
Starting Page	369
Ending Page	378
File Size	1029168
Page Count	10
File Format	PDF
ISBN	0780375343
DOI	10.1109/OCEANS.2002.1193300
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-10-29
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Data acquisition Frequency Array signal processing Acoustic noise Active noise reduction Underwater acoustics Sonar equipment Water resources Apertures Azimuth
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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