Results 11 to 20 of about 2,975 (179)
Sea state and rain: a second take on dual-frequency altimetry [PDF]
, 2004 TOPEX and Jason were the first two dual-frequency altimeters in space, with both operating at Ku- and C-band. Each thus gives two measurements of the normalized backscatter, sigma0, (from which wind speed is calculated) and two estimates of wave height ...
Quartly, G.D.
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Introduction to the Special Issue on "Satellite Altimetry: New Sensors and New Applications" [PDF]
, 2006 n/
Chen, Ge +3 more
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Waveform Aliasing in Satellite Radar Altimetry
IEEE Transactions on Geoscience and Remote Sensing, 2015 The full deramp pulse compression scheme employed by satellite radar altimeters digitizes each radar echo at a sampling rate matched to the chirp bandwidth. Echo power is undersampled by a factor of 2 when the power samples are simply obtained by squaring the magnitude of the echo samples, without first resampling, as is done in all altimeters to date.
Walter H. F. Smith, Remko Scharroo
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Improving the intercalibration of ?0 values for the Jason-1 and Jason-2 altimeters [PDF]
, 2009 The normalized backscatter from a radar altimeter, ?0, is a measure of the surface roughness at scales of a few radar wavelengths; over the ocean this is used to infer wind speed.
Quartly, Graham D.
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Altimetry Method for an Interferometric Radar Altimeter Based on a Phase Quality Evaluation
, 2023 A radar altimeter (RA) is useful to improve autonomous functions such as landing guidance or navigation control of an aircraft. To ensure more precise and safer flights by aircraft, an interferometric RA (IRA) capable of measuring the angle of a target ...
Sung-Yong Hong, Jong-Soo Ha
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Optimizing ?0 information from the Jason-2 altimeter [PDF]
, 2009 A radar altimeter's normalized backscatter, ?0, is used in many oceanographic applications, to infer values of wind speed, wind stress, rain rate and the presence of biogenic slicks.
Quartly, Graham D.
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Parameter estimation for peaky altimetric waveforms [PDF]
, 2013 Much attention has been recently devoted to the analysis of coastal altimetric waveforms. When approaching the coast, altimetric waveforms are sometimes corrupted by peaks caused by high reflective areas inside the illuminated land surfaces or by the ...
Boy, François +6 more
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Modeling Envisat RA-2 waveforms in the coastal zone: case-study of calm water contamination [PDF]
, 2010 Radar altimeters have so far had limited use in the coastal zone, the area with most societal impact. This is due to both lack of, or insufficient accuracy in the necessary corrections, and more complicated altimeter signals. This paper examines waveform
Vignudelli, Stefano +13 more
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Ice-sheet elevations from across-track processing of airborne interferometric radar altimetry
, 2009 Interferometric Radar Altimeters (IRA's) use dual receive antennas to overcome one of the spatial limitations of pulse-limited altimeters. In a conventional IRA measurement, the range and across-track direction of a scatterer are determined using the ...
Cullen, R. +9 more
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Radar Altimetry Aids Managing Gauge Networks
Water Resources Management, 2014 The hydrological observation network in the Amazon basin is made of conventional rainfall and water level stations presently maintained by the Agencia Nacional de Aguas (ANA), the National Agency for Waters. The water level network has long been plagued by difficulties associated with spatial coverage, timely delivery and data errors.
da Silva, J. S. +5 more
openaire +2 more sources