NDLI: Frequency-domain sonar processing in FPGAs and DSPs

Content Provider	IEEE Xplore Digital Library
Author	Graham, P. Nelson, B.
Copyright Year	1998
Description	Author affiliation: Brigham Young Univ., Provo, UT, USA (Graham, P.)
Abstract	Beamforming is a spatial filtering operation performed on data received by an array of sensors, such as antennas, microphones, or hydrophones. It provides a system with the ability to "listen" directionally even when the individual sensors in the array are omnidirectional. Over the past year we have been exploring the use of FPGA based custom computing machines for several sonar beamforming applications, including time domain beamforming (P. Graham nd B. Nelson, 1998), frequency domain beamforming, and matched field processing. In many ways sonar processing fits the criteria found by W. Mangione-Smith and B. Hutchings (1997) for good FPGA applications-the computations are data parallel, they require little control, the data sets are large (infinite streams), and the raw sensor data is at most 12 bits. However, they have three characteristics which make them challenging. First, they involve intensive arithmetic (multiply accumulates and trigonometric functions) on real and/or complex data. Second, they require significant memory support, far beyond that indicated in much previously published work. Third, the scale of the computation is large, requiring (possibly) hundreds of FPGAs and high bandwidth interconnections to meet real time constraints. We address the first issue.
Starting Page	306
Ending Page	307
File Size	33883
Page Count	2
File Format	PDF
ISBN	0818689005
DOI	10.1109/FPGA.1998.707928
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1998-04-17
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Field programmable gate arrays Digital signal processing Sensor arrays Array signal processing Microphone arrays Sonar applications Filtering Antenna arrays Receiving antennas Sonar equipment
Content Type	Text
Resource Type	Article

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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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