Results 291 to 300 of about 239,405 (340)
Some of the next articles are maybe not open access.
Science, 1991
Full disk images of Mars have been obtained with the use of the Very Large Array (VLA) to map the radar reflected flux density. The transmitter system was the 70-m antenna of the Deep Space Network at Goldstone, California. The surface of Mars was illuminated with continuous wave radiation at a wavelength of 3,5 cm.
Muhleman, Duane O. +3 more
openaire +3 more sources
Full disk images of Mars have been obtained with the use of the Very Large Array (VLA) to map the radar reflected flux density. The transmitter system was the 70-m antenna of the Deep Space Network at Goldstone, California. The surface of Mars was illuminated with continuous wave radiation at a wavelength of 3,5 cm.
Muhleman, Duane O. +3 more
openaire +3 more sources
Shuttle Imaging Radar Experiment
Science, 1982The 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.
P. Martin-Kaye +15 more
openaire +4 more sources
Compressive Radar Imaging [PDF]
2007 IEEE Radar Conference, 2007 We introduce a new approach to radar imaging based on the concept of compressive sensing (CS). In CS, a low-dimensional, nonadaptive, linear projection is used to acquire an efficient representation of a compressible signal directly using just a few measurements.
Philippe Steeghs, Richard G. Baraniuk
openaire +1 more source
Imaging with Radar Returns [PDF]
, 1978 Abstract : This dissertation presents both analytic and processing techniques for various radar imaging systems. A two dimensional system classification method, which is very general and hence applies to the special case of radar imaging systems as well, is proposed to assist in understanding the structure and describing the limitations of 2-D systems.
openaire +1 more source
Journal of Geophysical Research, 1976
The paper presents a set of seven radar brightness images and the corresponding altitude contours of small portions (circular regions of 1500-km diameter) of the Venus surface located at the center of the disk taken in the winter of 1973-1974. The regions imaged are arranged in an equatorial belt on the one face of Venus which is always seen on the ...
R.R. Green +2 more
openaire +2 more sources
The paper presents a set of seven radar brightness images and the corresponding altitude contours of small portions (circular regions of 1500-km diameter) of the Venus surface located at the center of the disk taken in the winter of 1973-1974. The regions imaged are arranged in an equatorial belt on the one face of Venus which is always seen on the ...
R.R. Green +2 more
openaire +2 more sources
Radar Systems (RADAR 97), 1997
In this paper an algorithm based on emerging data compression techniques and suitably adapted to the radar data of a VTS (Vessel Traffic Service) System is presented. The basic idea derives from the JPEG (Joint Photographic Experts Group) standard which converts image data to a spatial frequency representation using a 2-D discrete cosine transform (DCT)
V. Sabbatino, S. Bottalico
openaire +2 more sources
In this paper an algorithm based on emerging data compression techniques and suitably adapted to the radar data of a VTS (Vessel Traffic Service) System is presented. The basic idea derives from the JPEG (Joint Photographic Experts Group) standard which converts image data to a spatial frequency representation using a 2-D discrete cosine transform (DCT)
V. Sabbatino, S. Bottalico
openaire +2 more sources
New Radar Image of Venus [PDF]
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.
Gordon H. Pettengill +2 more
openaire +2 more sources
2018
Synthetic aperture radar (SAR) and inverse synthetic aperture radar (ISAR) are referred to in literature as imaging radars because of their ability to reconstruct electro-magnetic (e.m.) images of natural and man-made objects by coherently processing the echoes coming from the targets at different aspect angles.
Berizzi, Fabrizio +2 more
openaire +3 more sources
Synthetic aperture radar (SAR) and inverse synthetic aperture radar (ISAR) are referred to in literature as imaging radars because of their ability to reconstruct electro-magnetic (e.m.) images of natural and man-made objects by coherently processing the echoes coming from the targets at different aspect angles.
Berizzi, Fabrizio +2 more
openaire +3 more sources
16th European Microwave Conference, 1986, 1986
This paper is concerned with the problem of obtaining an image by means of a spatially coherent radar signal processing. After a brief review of the above technique, the problems of motion compensation (target tracking) and of 2D-Fourier inversion, arising in practical realisations, are discussed. In addition, the possibility of extending the theory to
GCorsini +4 more
openaire +3 more sources
This paper is concerned with the problem of obtaining an image by means of a spatially coherent radar signal processing. After a brief review of the above technique, the problems of motion compensation (target tracking) and of 2D-Fourier inversion, arising in practical realisations, are discussed. In addition, the possibility of extending the theory to
GCorsini +4 more
openaire +3 more sources
Space Science Reviews, 2007
Earth-based radar has been one of the few, and one of the most important, sources of new information about Mercury during the three decades since the Mariner 10 encounters. The emphasis during the past 15 years has been on full-disk, dual-polarization imaging of the planet, an effort that has been facilitated by the development of novel radar ...
openaire +3 more sources
Earth-based radar has been one of the few, and one of the most important, sources of new information about Mercury during the three decades since the Mariner 10 encounters. The emphasis during the past 15 years has been on full-disk, dual-polarization imaging of the planet, an effort that has been facilitated by the development of novel radar ...
openaire +3 more sources