NDLI: Passive Synthetic Aperture Sonar techniques in combination with tow ship noise canceling: application to a triplet towed array

Content Provider	IEEE Xplore Digital Library
Author	Colin, M.E.G.D. Groen, J.
Copyright Year	2002
Description	Author affiliation: TNO-FEL, The Hague, Netherlands (Colin, M.E.G.D.; Groen, J.)
Abstract	An important issue in research on passive ASW operations is improvement in signal-to-noise ratio (SNR) and bearing resolution for targets emitting low frequency signals. One of the techniques believed to improve these characteristics is Synthetic Aperture Sonar (SAS). The method is based on the artificial enlargement of a sonar array by coherently integrating acoustic snapshots at different antenna positions. This paper reports on the application of passive SAS in combination with other signal-processing algorithms. The used passive SAS algorithm is the method developed by S. Stergiopoulos, known as Extended Towed Array Measurement (ETAM) or the overlap correlator. It is based on the correlation of data snapshots on overlapping hydrophones. Correlation is a key issue in this method and since it is affected by noisy targets, some gain can be expected from noise cancellation. The influence on the performance of ETAM of a method of tow ship noise canceling at hydrophone level (Inverse Beam Forming, IBF) is analyzed. This approach increases ETAM performance by removing a loud and highly correlated noise source, the tow ship, and thus enhancing the other targets in the beam pattern. Eventually the synthetic aperture is processed by means of subaperture beamforming and port/starboard beamforming. The details of the processing chain are described in this paper. The methods are analyzed using data recorded during ASW trials at sea with the CAPTAS (Combined Active and Passive Towed Array System) triplet array. The TNO-FEL towed source (Socrates), transmitting controlled broadband noise and tonals, as well as passing civilian ships are used as targets. The performance of the processing chain and the interactions of its different elements are analyzed through the monitoring of SNR and beamwidth. The results of the algorithms applied to these experimental data show that they bring an improvement of a factor 4 on both SNR and beamwidth in comparison with a conventional beamformer. Port/starboard discrimination and the successful combination IBF-ETAM make this approach innovative.
Starting Page	2302
Ending Page	2309
File Size	458195
Page Count	8
File Format	PDF
ISBN	0780375343
DOI	10.1109/OCEANS.2002.1191988
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	Synthetic aperture sonar Marine vehicles Noise cancellation Signal to noise ratio Sonar equipment Acoustic beams Performance analysis Array signal processing Low-frequency noise Signal resolution
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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