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2012 IEEE International Geoscience and Remote Sensing Symposium, 2012
Analysis of the data from the Third METOP-A ASCAT Transponder Calibration Campaign indicates that the gain patterns of all beams have slightly reduced in-orbit relative to the gain patterns established by the Second Transponder Calibration Campaign.
J. J. W. Wilson +3 more
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Analysis of the data from the Third METOP-A ASCAT Transponder Calibration Campaign indicates that the gain patterns of all beams have slightly reduced in-orbit relative to the gain patterns established by the Second Transponder Calibration Campaign.
J. J. W. Wilson +3 more
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Deployment of the ASCAT calibration transponders
2010 IEEE International Geoscience and Remote Sensing Symposium, 2010The METOP-A Advanced Scatterometer Radar has stringent radiometric requirements requiring regular, accurate, calibration. The specified stability of 0.2dB or better is too demanding for targets such as rain forest or simple corner reflectors, so three highly stable return signal sources have been precisely sited to give accurate measures of the beam ...
A F Fromberg +4 more
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New Ascat Vegetation Optical Depth (IB-VOD) Retrievals Over Africa
IGARSS 2020 - 2020 IEEE International Geoscience and Remote Sensing Symposium, 2020Vegetation Optical Depth (VOD) plays an important role in monitoring the earth ecosystems. There are many VOD products released based on different satellites and frequencies. But most of the VOD products are derived from passive microwave data, and very few active VOD products have been released to date. This study investigated retrievals of the active
Liu, Xiangzhuo +9 more
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Enhanced-Resolution Reconstruction of ASCAT Backscatter Measurements
IEEE Transactions on Geoscience and Remote Sensing, 2016A wind scatterometer measures the normalized radar cross section σ° of the Earth's surface in order to estimate the ocean near-surface wind. Each measurement is the weighted integral of σ° over an area, so samples of σ° are filtered by a measurement spatial response function (SRF).
Richard D. Lindsley, David G. Long
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Analysis of ASCAT Ocean Backscatter Measurement Noise
IEEE Transactions on Geoscience and Remote Sensing, 2012The Advanced Scatterometer (ASCAT) level 1b products provide spatially averaged calibrated backscatter measurements along with their Kp values which are estimates of the normalized standard deviation of the backscatter values. The Kp values can be regarded as a measure of the error in the mean backscatter caused by speckle noise, instrument ...
C. Anderson +4 more
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A Parameterized ASCAT Measurement Spatial Response Function
IEEE Transactions on Geoscience and Remote Sensing, 2016The Advanced SCATterometer (ASCAT) measurement spatial response function (SRF) relates the weighted contribution of every location within the measurement footprint to the measured normalized radar cross section $\sigma^{\circ}$ . The SRF results from a combination of the antenna response and the onboard processing and is computed during ground ...
Richard D. Lindsley +3 more
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The Advanced Scatterometer (ASCAT) Ground Processing Prototype
IEEE 1999 International Geoscience and Remote Sensing Symposium. IGARSS'99 (Cat. No.99CH36293), 2003The Advanced Scatterometer ASCAT is a spaceborne real aperture C-band radar. Its primary measurement objective is the determination of wind fields at the ocean surface. ASCAT is intended as a follow-on to the wind mode of the Active Microwave Instrument (AMI) on the ESA Earth Remote Sensing satellites ERS-1 and 2. It is a candidate for the ESA/EUMETSAT
F. Rostan, M. Kuntz, S. Schutz
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High-Resolution Soil Moisture Retrieval With ASCAT
IEEE Geoscience and Remote Sensing Letters, 2016Satelliteborne C-band scatterometer measurements of the radar backscatter coefficient $(\sigma^{0})$ of the Earth can be used to estimate soil moisture levels over land. Such estimates are currently produced at 25- and 50-km resolution using the Advanced Scatterometer (ASCAT) sensor and a change detection algorithm originally developed at the ...
David B. Lindell, David G. Long
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ASCAT - Advanced Wind Scatterometer
[Proceedings] IGARSS '92 International Geoscience and Remote Sensing Symposium, 1992H. Ebner +3 more
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