Results 271 to 280 of about 35,695 (318)

Radar imaging of the lunar poles

Nature, 2003
Long-wavelength measurements reveal a paucity of ice in the Moon's polar craters. We have used a radio telescope at Arecibo Observatory, Puerto Rico, to map features of the lunar poles — some as small as 300 metres across — by collecting long-wavelength radar images that can penetrate several metres of lunar dust.
Campbell, Bruce A., Campbell, Donald B., Chandler, John F., Hine, Alice A., Nolan, Michael C., Perillat, Phillip J.   +5 more
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New Radar Image of Venus

Science, 1976
A new radar image of Venus covering the latitude range 46° to 75° and the approximate longitude range 290° to 10° is shown. The resolution is approximately 20 kilometers.
D B, Campbell, R B, Dyce, G H, Pettengill   +2 more
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Shuttle Imaging Radar Experiment

Science, 1982
The shuttle imaging radar (SIR-A) acquired images of a variety of the earth's geologic areas covering about 10 million square kilometers. Structural and geomorphic features such as faults, folds, outcrops, and dunes are clearly visible in both tropical and arid regions.
C, Elachi, W E, Brown, J B, Cimino, T, Dixon, D L, Evans, J P, Ford, R S, Saunders, C, Breed, H, Masursky, J F, McCauley, G, Schaber, L, Dellwig, A, England, H, Macdonald, P, Martin-Kaye, F, Sabins   +15 more
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Spaceborne imaging radars

International Journal of Imaging Systems and Technology, 1991
AbstractThe Seasat and Shuttle imaging radars flown in the 1970s and 1980s established a strong scientific and technical base for a number of imaging radars that are flying or under development. Recent advances in understanding wave‐surface interactions, utilization of multispectral and polarimetric data, as well as advances in microwave and electronic
openaire   +1 more source

Radar Imaging Through a Building Corner

IEEE Transactions on Geoscience and Remote Sensing, 2014
Through-wall imaging (TWI) requires dealing with targets embedded in a complex obscuring environment such as the walls of a building. This obscuring layout is often composed by many simple elements (possibly interacting) such as slabs, corners, and T-like structures.
Gianluca Gennarelli, Giovanni Riccio, Raffaele Solimene, Francesco Soldovieri   +3 more
openaire   +5 more sources

A single-chip false target radar image generator for countering wideband imaging radars

IEEE Journal of Solid-State Circuits, 2002
This paper describes the theory, design, implementation, simulation, and testing of an ASIC capable of generating false target radar images for countering wideband synthetic aperture and inverse synthetic aperture imaging radars. The 5.5 /spl times/ 6.1 mm IC has 81632 transistors, 132 I/O pins, and consumes 0.132 W at 70 MHz from a 3.3-V supply.
Fouts, Douglas J., Pace, Phillip E., Karow, Christopher, Ekestorm, Stig R.T.   +3 more
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The modeling of radar image based on radar textures

AIP Conference Proceedings, 2020
The paper is devoted to the development of a mathematical model of the terrain radar image created by the onboard radar. The model is based on the ray tracing method and takes into account the reflective properties of the surface using a special radar texture function The radar texture function is complex-valued function of the three 3D-vector ...
V. B. Kostousov, S. V. Kiseleva
openaire   +1 more source

Imaging radar polarimetry: a review

Proceedings of the IEEE, 1991
Presents a tutorial review of the broad sweep of topics relating to imaging radar polarimetry, ranging from mathematical foundations to hardware and from implementation approaches to signal processing and calibration. The authors examine current developments in sensor technology and implementation for recording polarimetric measurements, and describe ...
Howard A. Zebker, Jakob J. van Zyl
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On a Bayesian approach to coherent radar imaging

International Journal of Imaging Systems and Technology, 1992
AbstractIn coherent imaging the object of interest is complex but only its amplitude is to be estimated. The object phase yields nuisance variables and in a proper Bayesian approach it is necessary to obtain a phaseless likelihood function. We investigate a two‐dimensional case in which the target object is modelled as a collection of point scatterers ...
David Styerwalt, Glenn R. Heidbreder
openaire   +1 more source

A neural classifier for radar images

1996
Goal of our work has been to design a Neural Network, based on the Counterpropagation Network, able to solve the classification problem in a multi-radar system.
T. Casinelli, M. La Manna, Antonina Starita   +2 more
openaire   +1 more source