Results 11 to 20 of about 23,458 (290)
A Ku-band laboratory experiment on the electromagnetic bias
IEEE Transactions on Geoscience and Remote Sensing, 1993 A uniformly valid algorithm relating the normalized (or nondimensional) sea-surface electromagnetic (EM) bias to physical variables has not yet been established. Laboratory experiments are conducted to guide model development. Simultaneous and collocated measurements of surface topography and altimeter backscattered power are made in a wind-wave ...
Branger, Hubert +2 more
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Contributions to the determination of electromagnetic bias in Gnss-R altimetry [PDF]
, 2023 In this Ph. D. dissertation the electromagnetic bias in GNSS-R (Global Navigation Satellite Systems Reflectometry) altimetry has been studied. GNSS-R altimetry is a new type of system that uses navigation signals as signals of opportunity for Earth observation.
Ghavidel, Ali
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A Laboratory Investigation On Electromagnetic Bias In Sea Level Measurements By Microwave Altimeters [PDF]
[Proceedings] IGARSS'91 Remote Sensing: Global Monitoring for Earth Management, 2005 To contribute to a better understanding of the Electromagnetic Bias in radar altimetry, a serie of experiments was conducted in the I.M.S.T. large windwave facility using a focused beam radar set at 13.5 GHz frequency. For pure wind wave fields we found the bias to be a quadratic function of each of the commonly used prurameters, namely the significant
Branger, Hubert +2 more
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A numerical simulator to evaluate the electromagnetic bias in GNSS-R altimetry
2014 IEEE Geoscience and Remote Sensing Symposium, 2014 This paper presents the computed electromagnetic (EM) bias predicted for GNSS-R altimetry systems. First, a synthetic time-evolving sea surface is generated satisfying an ocean surface height spectrum. Then, a direct GNSS signal recorded by an up-looking antenna is used as the GNSS signal 'illuminating' the synthetic sea surface, and the scattered ...
Ghavidel, Ali +2 more
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A fractal model for the sea state bias in radar altimetry [PDF]
Nonlinear Processes in Geophysics, 1997 The Kirchhoff approximation is used to determine the sea state bias in radar altimetry. A weakly nonlinear model of the sea waves is used to derive the joint moments of two different points separated by a distance R; the bias moment is formulated, and ...
D. E. Bar, D. E. Bar, Y. Agnon, Y. Agnon
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Bias signal control in differential protection
MATEC Web of Conferences, 2018 The problem is to ensure the stability of the differential protection functioning at deep saturation of the cores of electromagnetic current transformers.
Kuprienko Viktor
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Overview of Research Status of DC Bias and Its Suppression in Power Transformers
Energies, 2022 In this article, the sources of DC bias and its effects on power transformers are first summarized. Secondly, the article classifies and summarizes the current DC bias calculation problems of power transformers, and puts forward some interesting ...
Youliang Sun +3 more
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Research on a Phased Electromagnetic Surface-based W-band Radar System
Leida xuebao, 2021 This paper introduces a W-band phased electromagnetic surface radar system. This phased electromagnetic surface works at 92～96 GHz and is manufactured with general PCB technology and processing accuracy requirements. The appropriate unit design makes the
You WU +7 more
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Improved electromagnetic bias theory [PDF]
Journal of Geophysical Research: Oceans, 2000 In this paper we describe modifications to a previous theory for the altimeter electromagnetic bias (EM bias) of Srokosz [1986]. A major correction introduces a scaling of Srokosz's model by nonnegligible dimensionless ratios that depend on the slope variance of both long and short waves.
Elfouhaily, T +3 more
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Inverse ProblemsAbstract In electromagnetic source localization problems stemming from linearized Poisson-type equation, the aim is to locate the sources within a domain that produce given measurements on the boundary. In this type of problem, biasing of the solution is one of the main causes of mislocalization.
Lahtinen, Joonas
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