NDLI: Advanced techniques for improving wind direction ambiguity removal in scatterometry

Content Provider	IEEE Xplore Digital Library
Author	Huddleston, J.N. West, R.D. Yueh, S.H. Wu-Yang Tsai
Copyright Year	1996
Description	Author affiliation: Jet Propulsion Lab., California Inst. of Technol., Pasadena, CA, USA (Huddleston, J.N.; West, R.D.; Yueh, S.H.; Wu-Yang Tsai)
Abstract	A scatterometer can be used to determine the driving wind speed and direction through the inversion of an empirical model function relating /spl sigma//sup 0/ (normalized radar cross-section) to wind speed and direction. Unfortunately, for a given value of measured /spl sigma//sup 0/, there is not a unique wind vector solution. Multiple /spl sigma//sup 0/ measurements of the same ocean area using different viewing geometries and/or polarizations can be used to reduce the number of possible wind vector solutions. The NASA Scatterometer (NSCAT) was designed and built to be launched on ADEOS. NSCAT will measure /spl sigma//sup 0/ from three different viewing geometries with one of the antennas making dual-polarization measurements. The NSCAT configuration provides additional information to assist in the selection of a wind vector solution. The process of selecting one of the wind vector solutions to represent the true wind vector is referred to as ambiguity removal or dealiasing. The ambiguity removal algorithm currently planned for NSCAT utilizes a simple median filter. From simulations, it has been determined that the median filtering technique will have an average skill of about 87.6%. The errors remaining in the wind field after ambiguity removal tend to be clustered together, span the width of the swath (600 km), and extend in the along track direction for several hundred kilometers. Errors also tend to produce sharp discontinuities in the retrieved wind field where there are no such discontinuities in the true wind field. We discuss techniques of ambiguity removal and outline two new algorithms which can be used to improve ambiguity removal performance without the inclusion of additional wind field information. The techniques are applied to simulated NSCAT.
Starting Page	1718
Ending Page	1720
File Size	329947
Page Count	3
File Format	PDF
ISBN	0780330684
DOI	10.1109/IGARSS.1996.516779
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1996-05-31
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Sea measurements Radar measurements Wind speed Geometry Antenna measurements Radar cross section Area measurement Oceans Polarization NASA
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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