NDLI: Refractivity-from-clutter using global environmental parameters

Content Provider	IEEE Xplore Digital Library
Author	Gerstoft, P. Rogers, L.T. Hodgkiss, W.S. Rovner, G.
Copyright Year	2001
Description	Author affiliation: Marine Phys. Lab., California Univ., San Diego, La Jolla, CA, USA (Gerstoft, P.)
Abstract	This paper examines the sensitivity of radar clutter returns to variations in parameters used to describe the refractive environment that is associated with surface-based ducts. This supports determining efficient parameters so as to minimize the search space required in the inverse problem of inferring the refractivity environment from observations of radar sea clutter. First, the sensitivity of replica fields to variations in range-independent parameters are considered. Next, variations in the parameters with range are modeled as a Markov processes. It is seen that either source of variation could explain variations in radar clutter observations obtained during a surface-based ducting event with the 3.0 GHz Space Range Radar (SPANDAR) at Wallops Island, VA. We then use the Simulated Annealing/Genetic Algorithm (SAGA) general purpose inversion code to infer refractivity parameters from observed clutter. SAGA is configured to use an embedded parabolic equation electromagnetic propagation model, a four-parameter model for atmospheric refractivity, and a linear least-squares objective function. The mismatch between (a) the optimal replica field and the observed clutter and (b) the inferred refractivity profile and the range-dependent refractivity structure obtained by in situ measurements, is discussed.
Starting Page	2746
Ending Page	2748
File Size	1347434
Page Count	3
File Format	PDF
ISBN	0780370317
DOI	10.1109/IGARSS.2001.978149
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-07-09
Publisher Place	Australia
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Refractive index Spaceborne radar Atmospheric modeling Sea surface Radar clutter Electromagnetic modeling Ducts Inverse problems Markov processes Discrete event simulation
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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