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- Scatterometer abstract "A radar scatterometer is designed to determine the normalized radar cross section (sigma-0) of the surface. Scatterometers operate by transmitting a pulse of microwave energy towards the Earth's surface and measuring the reflected energy. A separate measurement of the noise-only power is made and subtracted from the signal+noise measurement to determine the backscatter signal power. Sigma-0 is computed from the signal power measurement using the distributed target radar equation. Scatterometer instruments are very precisely calibrated in order to make accurate backscatter measurements.The primary application of spaceborne scatterometry has been measurements of near-surface winds over the ocean. Such instruments are known as wind scatterometers. By combining sigma-0 measurements from different azimuth angles, the near-surface wind vector over the ocean's surface can be determined using a geophysical model function (GMF) which relates wind and backscatter. Over the ocean, the radar backscatter results from scattering from wind-generated capillary-gravity waves, which are generally in equilibrium with the near-surface wind over the ocean. The scattering mechanism is known as Bragg scattering, which occurs from the waves that are in resonance with the microwaves.The backscattered power depends on the wind speed and direction. Viewed from different azimuth angles, the observed backscatter from these waves varies. These variations can be exploited to estimate the sea surface wind, i.e. its speed and direction. This estimate process is sometimes termed 'wind retrieval' or 'model function inversion'. This is a non-linear inversion procedure based on an accurate knowledge of the GMF (in an empirical or semi-empirical form) that relates the scatterometer backscatter and the vector wind. Retrieval requires an angular diversity scatterometer measurements with the GMF, which is provided by the scatterometer making several backscatter measurements of the same spot on the ocean's surface from different azimuth angles.Scatterometer wind measurements are used for air-sea interaction, climate studies and are particularly useful for monitoring hurricanes. Scatterometer backscatter data are applied to the study of vegetation, soil moisture, polar ice, tracking Antarctic icebergs and global change. Scatterometer measurements have been used to measure winds over sand and snow dunes from space. Non-terrestrial applications include study of Solar System moons using space probes. This is especially the case with the NASA/ESA Cassini mission to Saturn and its moons.Several generations of wind scatterometers have been flown in space by NASA, ESA, and NASDA. The first operational wind scatterometer was known as the Seasat Scatterometer (SASS) and was launched in 1978. It was a fan-beam system operating at Ku-band (14 GHz). In 1991 ESA launched the European Remote-Sensing Satellite ERS-1 Advanced Microwave Instrument (AMI) scatterometer, followed by the ERS-2 AMI scatterometer in 1995. Both AMI fan-beam systems operated at C-band (5.6 GHz). In 1996 NASA launched the NASA Scatterometer (NSCAT), a Ku-band fan-beam system. NASA launched the first scanning scatterometer, known as 'SeaWinds', on QuikSCAT in 1999. It operated at Ku-band. A second SeaWinds instrument was flown on the NASDA ADEOS-2 in 2002. The Indian Space Research Organization launched a Ku-band scatterometer on their Oceansat-2 platform in 2009. ESA and EUMETSAT launched the first C-band ASCAT in 2006 onboard Metop-A.".
- Scatterometer thumbnail Scattometer_principle.GIF?width=300.
- Scatterometer wikiPageExternalLink manati.star.nesdis.noaa.gov.
- Scatterometer wikiPageExternalLink OceanWind.
- Scatterometer wikiPageExternalLink scatterometer.
- Scatterometer wikiPageExternalLink www.scp.byu.edu.
- Scatterometer wikiPageExternalLink Scatterometry.html.
- Scatterometer wikiPageID "2152061".
- Scatterometer wikiPageLength "8490".
- Scatterometer wikiPageOutDegree "35".
- Scatterometer wikiPageRevisionID "707737754".
- Scatterometer wikiPageWikiLink Anisotropy.
- Scatterometer wikiPageWikiLink Azimuth.
- Scatterometer wikiPageWikiLink Backscatter.
- Scatterometer wikiPageWikiLink Braggs_law.
- Scatterometer wikiPageWikiLink Category:Metrology.
- Scatterometer wikiPageWikiLink Category:Satellite_meteorology_and_remote_sensing.
- Scatterometer wikiPageWikiLink EUMETSAT.
- Scatterometer wikiPageWikiLink Earth.
- Scatterometer wikiPageWikiLink Empirical_evidence.
- Scatterometer wikiPageWikiLink Euclidean_vector.
- Scatterometer wikiPageWikiLink European_Remote-Sensing_Satellite.
- Scatterometer wikiPageWikiLink European_Space_Agency.
- Scatterometer wikiPageWikiLink Floristics.
- Scatterometer wikiPageWikiLink Geophysics.
- Scatterometer wikiPageWikiLink Global_change.
- Scatterometer wikiPageWikiLink Iceberg.
- Scatterometer wikiPageWikiLink Indian_Space_Research_Organisation.
- Scatterometer wikiPageWikiLink Kármán_line.
- Scatterometer wikiPageWikiLink MetOp.
- Scatterometer wikiPageWikiLink Microwave.
- Scatterometer wikiPageWikiLink NASA.
- Scatterometer wikiPageWikiLink National_Space_Development_Agency_of_Japan.
- Scatterometer wikiPageWikiLink Ocean.
- Scatterometer wikiPageWikiLink Polar_ice_cap.
- Scatterometer wikiPageWikiLink QuikSCAT.
- Scatterometer wikiPageWikiLink Radar_cross-section.
- Scatterometer wikiPageWikiLink Science_(journal).
- Scatterometer wikiPageWikiLink Seasat.
- Scatterometer wikiPageWikiLink Tropical_cyclone.
- Scatterometer wikiPageWikiLink Vegetation.
- Scatterometer wikiPageWikiLink Water_content.
- Scatterometer wikiPageWikiLink Wind.
- Scatterometer wikiPageWikiLink File:Scattometer_principle.GIF.
- Scatterometer wikiPageWikiLink File:Soulik_2013_July_10_Scatterometer_Ascending_Pass.png.
- Scatterometer wikiPageWikiLinkText "ASCAT scatterometer".
- Scatterometer wikiPageWikiLinkText "ASCAT".
- Scatterometer wikiPageWikiLinkText "Advanced Scatterometer (ASCAT)".
- Scatterometer wikiPageWikiLinkText "Advanced Scatterometer".
- Scatterometer wikiPageWikiLinkText "Scatterometer".
- Scatterometer wikiPageWikiLinkText "advanced scatterometer".
- Scatterometer wikiPageWikiLinkText "scatterometer".
- Scatterometer wikiPageWikiLinkText "scatterometry".
- Scatterometer wikiPageUsesTemplate Template:Lead_too_long.
- Scatterometer wikiPageUsesTemplate Template:Reflist.
- Scatterometer subject Category:Metrology.
- Scatterometer subject Category:Satellite_meteorology_and_remote_sensing.
- Scatterometer comment "A radar scatterometer is designed to determine the normalized radar cross section (sigma-0) of the surface. Scatterometers operate by transmitting a pulse of microwave energy towards the Earth's surface and measuring the reflected energy. A separate measurement of the noise-only power is made and subtracted from the signal+noise measurement to determine the backscatter signal power. Sigma-0 is computed from the signal power measurement using the distributed target radar equation.".
- Scatterometer label "Scatterometer".
- Scatterometer sameAs Q905295.
- Scatterometer sameAs Difusòmetre.
- Scatterometer sameAs Scatterometrie.
- Scatterometer sameAs Difusómetro.
- Scatterometer sameAs Difusometro.
- Scatterometer sameAs Diffusomètre.
- Scatterometer sameAs Scatterometer.
- Scatterometer sameAs Scatterometer.
- Scatterometer sameAs Scatterometer.
- Scatterometer sameAs Skaterometria_atmosfery.
- Scatterometer sameAs m.06qmby.
- Scatterometer sameAs Скаттерометр.
- Scatterometer sameAs Q905295.
- Scatterometer wasDerivedFrom Scatterometer?oldid=707737754.
- Scatterometer depiction Scattometer_principle.GIF.
- Scatterometer isPrimaryTopicOf Scatterometer.