High-Resolution Imaging of the Ocean Surface Backscatter by Inversion of Altimeter WaveformsSource: Journal of Atmospheric and Oceanic Technology:;2011:;volume( 028 ):;issue: 008::page 1050DOI: 10.1175/2011JTECHO820.1Publisher: American Meteorological Society
Abstract: his paper presents a new method to analyze high-resolution altimeter waveforms in terms of surface backscatter. Over the ocean, a basic assumption of modeling altimeter echo waveforms is to consider a homogeneous sea surface within the altimeter footprint that can be described by a mean backscatter coefficient. When the surface backscatter varies strongly at scales smaller than the altimeter footprint size, such as in the presence of surface slicks, rain, small islands, and altimeter echoes can be interpreted as high-resolution images of the surface whose geometry is annular and not rectangular. A method based on the computation of the imaging matrix and its pseudoinverse to infer the surface backscatter at high resolution (~300 m) from the measured waveforms is presented. The method is tested using synthetic waveforms for different surface backscatter fields and is shown to be unbiased and accurate. Several applications can be foreseen to refine the analysis of rain patterns, surface slicks, and lake surfaces. The authors choose here to focus on the small-scale variability of backscatter induced by a submerged reef smaller than the altimeter footprint as the function of tide, significant wave height, and wind.
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contributor author | Tournadre, Jean | |
contributor author | Chapron, Bertrand | |
contributor author | Reul, Nicolas | |
date accessioned | 2017-06-09T16:40:57Z | |
date available | 2017-06-09T16:40:57Z | |
date copyright | 2011/08/01 | |
date issued | 2011 | |
identifier issn | 0739-0572 | |
identifier other | ams-72136.pdf | |
identifier uri | http://onlinelibrary.yabesh.ir/handle/yetl/4214106 | |
description abstract | his paper presents a new method to analyze high-resolution altimeter waveforms in terms of surface backscatter. Over the ocean, a basic assumption of modeling altimeter echo waveforms is to consider a homogeneous sea surface within the altimeter footprint that can be described by a mean backscatter coefficient. When the surface backscatter varies strongly at scales smaller than the altimeter footprint size, such as in the presence of surface slicks, rain, small islands, and altimeter echoes can be interpreted as high-resolution images of the surface whose geometry is annular and not rectangular. A method based on the computation of the imaging matrix and its pseudoinverse to infer the surface backscatter at high resolution (~300 m) from the measured waveforms is presented. The method is tested using synthetic waveforms for different surface backscatter fields and is shown to be unbiased and accurate. Several applications can be foreseen to refine the analysis of rain patterns, surface slicks, and lake surfaces. The authors choose here to focus on the small-scale variability of backscatter induced by a submerged reef smaller than the altimeter footprint as the function of tide, significant wave height, and wind. | |
publisher | American Meteorological Society | |
title | High-Resolution Imaging of the Ocean Surface Backscatter by Inversion of Altimeter Waveforms | |
type | Journal Paper | |
journal volume | 28 | |
journal issue | 8 | |
journal title | Journal of Atmospheric and Oceanic Technology | |
identifier doi | 10.1175/2011JTECHO820.1 | |
journal fristpage | 1050 | |
journal lastpage | 1062 | |
tree | Journal of Atmospheric and Oceanic Technology:;2011:;volume( 028 ):;issue: 008 | |
contenttype | Fulltext |