Results 201 to 210 of about 7,805 (237)

Studies of Enhanced Radar Backscatter.

1996
Abstract : Since 1 October 1991, Dr Min-Chang Lee and his students at MIT and Boston Univ., have conducted experimental and theoretical research aimed at investigating ionospheric plasma disturbances which can significantly affect radio wave propagation from satellite communications systems.
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Evaluating Roughness Models of Radar Backscatter

IEEE Transactions on Geoscience and Remote Sensing, 1987
A unique set of data collected for a soil moisture experiment has been used to evaluate three radar backscatter roughness models. The data were collected by the NASA Space Shuttle flight 41G (SIR-B) synthetic aperture radar (SAR) in an intensively farmed area near Fresno, California.
Edwin Engman, James Wang
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Multi-radar studies of auroral backscatter

Journal of Atmospheric and Terrestrial Physics, 1988
Abstract Simultaneous observations of auroral irregularities in the E-region were made by the EISCAT incoherent scatter radar and two auroral radars—one at Karmaselga, operating at 46.5 MHz, and the other at Essoyla, operating at 93 MHz. A comparison of the measured strength of auroral backscatter with the values predicted by theory suggests that for
P.J.S Williams, B Jones, M Uspensky, G Starkov   +3 more
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Radar backscattering from sea foam and spray

2013 IEEE International Geoscience and Remote Sensing Symposium - IGARSS, 2013
A radar backscattering model of sea foam and spray is considered The model suggested is based on a modified Mie theory describing resonance scattering and adsorption effects from polydisperse systems of air bubbles (foam) and water droplets (spray) in a wide range of microwave frequencies.
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A radar backscatter model for forest stands

Waves in Random Media, 1992
Abstract A Monte Carlo method for calculating the radar backscatter cross-sections from a forest stand is presented in this study. The model for the forest stand consists of two layers: the top layer contains a mixture of randomly orientated dielectric circular disks or small needles representing the leaves of the deciduous trees or coniferous trees ...
H T Chuah, H S Tan
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A new radar auroral backscatter experiment

Nature, 1983
In 1982 a new radar auroral backscatter system, SABRE (Sweden and Britain Radar Experiment), commenced operation in northern Europe. Observations with this ground-based system allow estimates to be made of the electric fields in the auroral E-region. As an electric field probe, the coherent radar technique is unique in that measurements are made over a
Nielsen, E., Güttler, E., Thomas, E., Stewart, C., Jones, T., Hedberg, E.   +5 more
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Backscatter-Modulation Semiconductor Laser Radar

SPIE Proceedings, 1989
When a non-cooperative target is at a distance within the coherence length of a laser, the backscattered light induces modulation signals in the laser power output that can be used for velocimetry and ranging. Backscatter modulation in semiconductor laser diodes has had little practical impact in laser radar because the coherence length of these ...
Peter J. de Groot, Francis X. D'Amato, Gregg M. Gallatin, Robert Dixon, Chandrasekhar Roychoudhuri   +4 more
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Radar Backscattering by Inhomogeneous Precipitation Particles

Journal of the Atmospheric Sciences, 1980
Abstract Calculations of radar backscattering by inhomogeneous precipitation particles require values of the dielectric function of two-component mixtures. Four such dielectric functions are critically examined and their relative merits are weighed.
Craig F. Bohren, Louis J. Battan
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Modeling of extremely heterogeneous radar backscatter

IGARSS'97. 1997 IEEE International Geoscience and Remote Sensing Symposium Proceedings. Remote Sensing - A Scientific Vision for Sustainable Development, 2002
A new class of G-distributions has been proposed to characterize the statistical properties of multi-look processed SAR data over the wide range of homogeneous, heterogeneous and extremely heterogeneous backscattering of terrain classes. The probability density function was derived as a product of a gamma distributed complex speckle variable and the ...
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Simulation of radar backscattering in a ripple tank

Proceedings of the IEEE, 1965
A ripple tank study of wave motion associated with the wave formation in the vicinity of a cone-sphere is discussed. The experimental test facility is described. Included in the interpretation of the ripple tank experiments are the wave formations in the shadow region of the cone-sphere showing traveling and creeping waves.
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