NDLI: Interferometric signal denoised by wavelets

Content Provider	IEEE Xplore Digital Library
Author	Sintes, C. Garello, R. Guerio, D.
Copyright Year	2006
Description	Author affiliation: Technopole Brest-Iroise, E.N.S.T. Bretagne, Brest (Sintes, C.; Garello, R.; Guerio, D.)
Abstract	This paper concerns the possibilities for side scan sonar to determine the bathymetry. High definition sea-bottom imaging is the primary task for new side scan sonars; nevertheless, these systems are also able to estimate the relief with a definition equal to the pixel resolution of conventional imaging sonar, through an interferometric multisensors approach. The main drawback concerns both the errors and accuracy of the computed numerical elevation model. Indeed, interferometric methods use a phase difference to determine a time delay between two sensors observing the same sea-bottom location. The phase difference belongs to a finite interval ] -pi ,+pi], while the time delay between two sensors does not: this mapping induces a 2pi biased phase. Very often, sonar are well-designed to allow removing this bias through vernier techniques. However, some difficulties come from interferometric noise, which generates errors on the 2pi bias estimation derived from the vernier. A traditional way to reduce noise impact on the interferometric signal is to average received data. Obviously, such a method does not preserve the resolution of the bathymetric estimation. Thus, this paper presents an attempt to improve both the accuracy and resolution of the interferometric signal relying on a wavelet based method of image speckle reduction. Traditionally, speckle noise is processed as the logarithm of the signal absolute value. However for this application, the proposed interferometric speckle reduction is achieved directly on the interferometric signal by integrating information, with the guidance of the despeckled image. On the presented results, phase despecklisation improves considerably the quality of the interferometric signal in terms of signal to noise ratio, without an important degradation of resolution
Starting Page	1
Ending Page	6
File Size	7906750
Page Count	6
File Format	PDF
ISBN	1424401143
DOI	10.1109/OCEANS.2006.306986
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-09-18
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Sonar Signal resolution Speckle High-resolution imaging Image resolution Delay effects Pixel Numerical models Noise generators Noise reduction
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
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
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in