Helmholtz Centre Potsdam
GFZ German Research Centre for Geosciences
Abstract (EDOC: 6239)
In 1995 the U.S. American GPS (Global Positioning System) has met all requirements for full operational capability and revolutionized the precise navigation. Apart from that main application, the GPS signals also can be used to derive characteristic properties of the propagation medium (neutral atmosphere and ionosphere), the basic principle which is used by ground and satellite based GPS remote sensing methods. The key measure from GPS, which is used to derive atmospheric parameters, is the atmospheric induced excess phase of the GPS signals, while travelling through the atmosphere. During the last decade the GPS based remote sensing techniques came up as a promising tool for global, permanent, weather-independent and calibration-free monitoring of the Earth's atmosphere and ionosphere. Scientists all over the world are looking forward with high expectations to the establishing of the GPS methods for remote sensing. E.g. a whole familiy of Low Earth Orbiting (LEO) satellites carrying GPS receivers for atmospheric and ionospheric measurements will come up during the next years, as, e.g. COSMIC (Constellation Observing System for Meteorology, Ionosphere and Climate, 6 satellites, U.S.), MetOp (Meteorology Operational, 3 satellites, Europe) or EQUARS (EQUatorial Atmosphere Research Satellite, 1 satellite, Brazil/Japan). The ground and space based GPS sounding techniques for atmo- sphere/ionosphere monitoring will be introduced with focus to the GPS radio occultation method. Recent results and examples for various applications of the GPS data in weather forecast and atmospheric/iono- spheric research will be given. Hereby, the German CHAMP satellite and related results will be focussed on.
(2005): Ground and space based GPS atmospheric sounding: Introduction and recent results. The International Colloquium on an International Network for Tropical Atmosphere Radar - INTAR (Tirupati, India 2005).