- GPS Radio occultation
GPS Radio occultation is a relatively new technique (first applied in 1995) for performing atmospheric measurements. It is used as a
weather forecasting tool, and could also be harnessed in monitoringclimate change . The technique involves alow-Earth orbit satellite receiving a signal from aGPS satellite. The signal has to pass through the atmosphere and gets refracted along the way. The magnitude of the refraction depends on the temperature and water vapor concentration in the atmosphere.cite web|title=GPS 'thermometer' could flag up climate change|url=http://technology.newscientist.com/channel/tech/dn13329-gps-thermometer-could-flag-up-climate-change.html?feedId=online-news_rss20|accessdate=2008-02-16]GPS Radio occultation amounts to an almost instantaneous depiction of the atmospheric state. The relative position between the
GPS satellite and thelow-Earth orbit satellite changes over time, allowing for a vertical scanning of successive layers of the atmosphere.cite web|title=GPS Space-Based & GPS Radio occultation|url=http://geodaf.mt.asi.it/html_old/GPSAtmo/space.html|accessdate=2008-02-16]ee also
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GPS meteorology
* [http://www.cosmic.ucar.edu COSMIC Project Website]
* [http://www.geooptics.com GeoOptics LLC Website - First commercial operational RO Constellation]References
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