Results 121 to 130 of about 2,512 (168)

Radar Backscatter from the Earth's Ionosphere

IEEE Transactions on Military Electronics, 1964
The role of radar backscatter observations in ionospheric studies is outlined. The theoretical developments are described that form the basis for ground-based measurements of electron density, electron temperature, ion temperature, and ionic composition at ionospheric heights, Observations of the first three parameters have been successful. Observation
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Skywave over-the-horizon backscatter radar

2001 CIE International Conference on Radar Proceedings (Cat No.01TH8559), 2002
Skywave over-the-horizon backscatter radar (OTHR) has great potential for detecting such targets as cruise missiles, stealth aircraft, the powered trajectory of ballistic missiles and aircraft carriers over long distances and at the same time. This paper evaluates the detectability of OTHR for small targets through experimental research and emulation ...
null Tang Xiaodong, null Han Yunjie, null Zhou Wenyu   +2 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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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 Backscatter Statistics From Water Waves

Conference Proceedings on Engineering in the Ocean Environment, 2005
Instantaneous backscatter cross sections were measured in a wavetank with a coherent, vertically polarized Ka-band radar , with a footprint of 24 by 35 cm. The first order probability density was found to follow the K-distribution exceedingly well. The distribution exhibited a large tail at low wind speed, but became almost exponentially distributed at
B.L. Gotwols, W.C. Keller
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Multichannel radar backscatter communication and localization

2014 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2014
This paper concerns the use of wideband RF backscatter from semi-passive RF tags for energy-efficient wireless telemetry. Using LFM (Linear Frequency Modulated) signals from a radar base station, we present a method for joint ranging and communications with a distributed set of sensor nodes. Backscatter signaling from each node results in modulation on
Itay Cnaan-On, Stewart J. Thomas, Matthew S. Reynolds, Jeffrey L. Krolik   +3 more
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Radar target recognition using compressive backscatter

2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting, 2017
This paper compares various approaches to target classification either using frequency-domain data recorded via stepped-frequency radar with compressive measurements, or using ultra-wideband radar data in the time-domain with compressive measurements. Real radar backscatter of commercial aircraft models is used in this study.
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Doppler radar backscatter from ring waves

International Journal of Remote Sensing, 1998
The effects of rain falling on the sea surface have been investigated using a 3 GHz Doppler radar. In the absence of wind, the field measurements of radar backscatter show an enhancement of surface roughness due to a 4 mm hr 1 rainfall, which is equivalent to a light wind of several m s 1, but without the azimuthal variation characteristic of wind ...
M. J. Smith, E. M. Poulter, J. A. Mcgregor   +2 more
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Vibrational Radar Backscatter Communications

2021 55th Asilomar Conference on Signals, Systems, and Computers, 2021
Jessica Centers, Jeffrey Krolik
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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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