NDLI: High resolution spectral analysis and the acoustic remote sensing of ocean current velocity

Content Provider	IEEE Xplore Digital Library
Author	Hodgkiss, W. Hansen, D.
Copyright Year	1983
Description	Author affiliation: Scripps Institution of Oceanography, San Diego, CA (Hodgkiss, W.)
Abstract	Doppler sonars use the perceived shift in carrier frequency between the outgoing pulse and the returning echo to make an estimate of scatterer radial velocity at several ranges of interest. Scatterers suspended neutrally buoyant in the water column are used as tracers for the remote sensing of water mass motion. Inherently, the problem is one of high resolution (distinguishing small differences in velocity) spectral estimation across segments (range bins) which are too short to provide the desired resolution via conventional methods (FFT) of spectral analysis. In this paper, the application of pth-order autoregressive time series analysis models to the estimation of the time-evolving Doppler sonar reverberation power spectrum is reported. First, with the aid of a reverberation model, it is shown that the spatial transfer function characteristics of a transducer have a significant influence on the time-evolving shape of the reverberation power spectrum. Thus, it is suggested that the use of first-order models for the purpose of Doppler shift estimation simply is inadequate. Then, the results of an exploratory analysis of pings from a 67 kHz Doppler sonar are presented which appears to confirm this caution.
Starting Page	961
Ending Page	964
File Size	139086
Page Count	4
File Format	PDF
DOI	10.1109/ICASSP.1983.1171964
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1983-04-14
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Spectral analysis Remote sensing Oceans Sonar Reverberation Frequency estimation Acoustic scattering Acoustic pulses Spatial resolution Time series analysis
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

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