NDLI: Hybrid adaptive beamforming for multi-line arrays

Content Provider	IEEE Xplore Digital Library
Author	Cox, H. Hung Lai Heaney, K.D. Murray, J.J.
Copyright Year	2003
Description	Author affiliation: Lockheed Martin Orincon Defence, Arlington, VA, USA (Cox, H.; Hung Lai; Heaney, K.D.; Murray, J.J.)
Abstract	The use of towed arrays consisting of multiple lines brings with it special problems for adaptive beamforming. The large number of elements coupled with array motion results in snapshot deficient situation in which a reduced degree-of-freedom approach is required. The existence of imbalances between arrays, variable ocean currents and towing dynamics cause distortion in array shape which may be unknown or poorly known. One of the advantages of adaptive beamforming is its ability to overcome left-right ambiguity that results from the conical beampatterns of the individual lines. We examine approaches that first perform conventional beamforming on individual lines followed by adaptive combination of beam outputs across lines. Three approaches to array shape estimation for adaptive beam-combination are examined. The first assumes element positions are known to some accuracy and uses that information. The second assumes no shape information and uses self-cohering on a source of opportunity. The third uses self-cohering to align the beams of different lines and then uses position information about one reference element on each line. The effectiveness of these approaches is examined using simulations for various amounts of array distortion.
Starting Page	1858
Ending Page	1862
File Size	340680
Page Count	5
File Format	PDF
ISBN	0780381041
DOI	10.1109/ACSSC.2003.1292304
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-11-09
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Array signal processing Adaptive arrays Sensor arrays Shape measurement Oceans Distortion measurement Sea measurements Azimuth Programmable control Adaptive control
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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