Abstract/Details

Uncertainties in oceanic microwave remote sensing: The radar footprint, the wind-backscatter relationship, and the measurement probability density function


1999 1999

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Abstract (summary)

Oceanic microwave remote sensing provides the data necessary for the estimation of significant geophysical parameters such as the near-surface vector wind. To obtain accurate estimates, a precise understanding of the measurements is critical. This work clarifies and quantifies specific uncertainties in the scattered power measured by an active radar instrument.

While there are many sources of uncertainty in remote sensing measurements, this work concentrates on three significant, yet largely unstudied effects. With a theoretical derivation of the backscatter from an ocean-like surface, results from this dissertation demonstrate that the backscatter decays with surface roughness with two distinct modes of behavior, affected by the size of the footprint. A technique is developed and scatterometer data analyzed to quantify the variability of spaceborne backscatter measurements for given wind conditions; the impact on wind retrieval is described in terms of bias and the Cramer-Rao lower bound. The probability density function of modified periodogram averages (a spectral estimation technique) is derived in generality and for the specific case of power estimates made by the NASA scatterometer. The impact on wind retrieval is quantified.

Indexing (details)


Subject
Electrical engineering;
Oceanography;
Ocean engineering;
Remote sensing
Classification
0544: Electrical engineering
0415: Oceanography
0547: Ocean engineering
0799: Remote sensing
Identifier / keyword
Applied sciences, Earth sciences, Backscatter, Footprint, Oceanic, Radar, Remote sensing, Wind-backscatter
Title
Uncertainties in oceanic microwave remote sensing: The radar footprint, the wind-backscatter relationship, and the measurement probability density function
Author
Johnson, Paul E.
Number of pages
175
Publication year
1999
Degree date
1999
School code
0022
Source
DAI-B 60/04, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9780599238091, 0599238097
Advisor
Long, David G.
University/institution
Brigham Young University
University location
United States -- Utah
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
9924232
ProQuest document ID
304493269
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/304493269
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