Results 81 to 90 of about 512,786 (105)

Fully polarimetric calibration system for HUT polarimetric radiometer

IGARSS 2000. IEEE 2000 International Geoscience and Remote Sensing Symposium. Taking the Pulse of the Planet: The Role of Remote Sensing in Managing the Environment. Proceedings (Cat. No.00CH37120), 2002
The fully polarimetric calibration system for HUT polarimetric radiometer is described. The system generates adjustable reference brightness temperatures for all four Stokes parameters. The available calibration time varies from 10 to 20 minutes depending on the desired accuracy.
J. Lahtinen, M. Hallikainen
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Polarimetric calibration for RADARSAT-2

IGARSS 2000. IEEE 2000 International Geoscience and Remote Sensing Symposium. Taking the Pulse of the Planet: The Role of Remote Sensing in Managing the Environment. Proceedings (Cat. No.00CH37120), 2002
The RADARSAT-2 SAR currently under development will be required to operate in many modes, including a fully polarimetric mode with at least 30 beams. An efficient means for achieving and maintaining polarimetric calibration of these beams is needed, and the paper describes the work that has been performed to define and validate a method based on ...
A.P. Luscombe, K. Chotoo, B.D. Huxtable
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Phase Calibration Of Polarimetric SAR

International Geoscience and Remote Sensing Symposium, 'Remote Sensing: Moving Toward the 21st Century'., 2005
Techniques were developed to measure the phase characteristics of a polarimetric imaging synthetic aperture radar (SAR). portion of the radar signature from an airborne, polarimetric SAR system, targets (dihedral and trihedral corner reflectors) with known characteristics were deployed, and several passes of polarimetric data collected.
D.R. Sheen, E.S. Kasischke, R.A. Shuchman   +2 more
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Calibration of bistatic polarimetric scatterometers

IGARSS '96. 1996 International Geoscience and Remote Sensing Symposium, 2002
The recent interest in bistatic and multistatic radar has led to a need for information concerning the bistatic reflectivity of clutter viewed by such systems. Unfortunately, little information is available describing calibration for a bistatic radar system. This paper presents a new calibration technique for bistatic scatterometers.
F. Daout, A. Khenchaf, J. Saillard
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Polarimetric UHF Calibration for SETHI

PIERS Online, 2010
The SETHI sensor from ONERA is an airborne radar equipped with difierent bands (UHF-VHF, L, X) on a Falcon 20. The UHF-VHF band is fully polarimetric and can operate between 225MHz up to 460MHz. In August 2009, this system was used in French Guiana for the TROPISAR experiment. Data were acquired from 0 - incidence angle up to 65 - incidence angle and a
Helene Oriot, Colette Coulombeix, Pascale Dubois-Fernandez   +2 more
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Polarimetric Calibration Using a Genetic Algorithm

IEEE Geoscience and Remote Sensing Letters, 2007
This letter presents a novel calibration approach to polarimetric synthetic aperture radar using distributed targets with known scattering characteristics. A genetic algorithm with complex-valued encoding is proposed to solve the overdetermined system of nonlinear equations associated with the polarimetric calibration problem.
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The GREGOR polarimetric calibration unit

Astronomische Nachrichten, 2012
AbstractThe new Solar telescope GREGOR is designed to observe small‐scale dynamic magnetic structures below a size of 70 km on the Sun with high spectral resolution and polarimetric accuracy. For this purpose, the polarimetric concept of GREGOR is based on a combination of post‐focus polarimeters with pre‐focus equipment for high precision calibration.
A. Hofmann, K. Arlt, H. Balthasar, S.M. Bauer, W. Bittner, J. Paschke, E. Popow, J. Rendtel, D. Soltau, T. Waldmann   +9 more
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Simulated Calibrators Based Polarimetric Weather Radar External Calibration

2020 13th International Congress on Image and Signal Processing, BioMedical Engineering and Informatics (CISP-BMEI), 2020
As a potential tool for atmospheric observation, weather radar has shown good performance in providing abundant meteorological data during a short time. The key to use weather radar is that the collected data should have sufficient accuracy. To achieve this purpose, weather radar external calibration technique is proposed and applied for practical data
Jie Yin, Hui Bi 0001, Feng Tian, Ling Wang 0012, Jiarui Deng, Jingjing Zhang   +5 more
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Calibration of HUT polarimetric radiometer

IGARSS '98. Sensing and Managing the Environment. 1998 IEEE International Geoscience and Remote Sensing. Symposium Proceedings. (Cat. No.98CH36174), 1998
The Helsinki University of Technology polarimetric radiometer calibration system is described. Calibration is based on a metal wire grid polarizer and two absorption loads at different temperatures. The characteristics of the grid and the formulae for calibration are presented. The maximum error due calibration is calculated.
J. Lahtinen, M. Hallikainen
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Calibration of polarimetric radar systems

IEEE Antennas and Propagation Society International Symposium 1997. Digest, 2002
The calibration of reciprocal radar systems has been studied previously, where it was shown: (1) that full polarimetric calibration of radar systems can remove cross-polarization errors from the measurements, and (2) that for reciprocal radars Fourier analysis of polarimetric data obtained using a rotating dihedral can reduce the noise and background ...
L.A. Muth, R.C. Wittmann
openaire   +1 more source