G
George A. Hajj
Researcher at California Institute of Technology
Publications - 72
Citations - 5338
George A. Hajj is an academic researcher from California Institute of Technology. The author has contributed to research in topics: Global Positioning System & Radio occultation. The author has an hindex of 26, co-authored 71 publications receiving 4918 citations. Previous affiliations of George A. Hajj include Jet Propulsion Laboratory.
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Observing Earth's atmosphere with radio occultation measurements using the Global Positioning System
TL;DR: In this article, the authors present the first systematic, extensive error analysis of the spacecraft radio occultation technique using a combination of analytical and simulation methods to establish a baseline accuracy for retrieved profiles of refractivity, geopotential, and temperature.
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A technical description of atmospheric sounding by GPS occultation
TL;DR: In this paper, the authors describe a system that was developed at the Jet Propulsion Laboratory and used to process the GPS/MET data and compared to analyses from the European Center for Medium-range Weather Forecast (ECMWF).
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Ionospheric electron density profiles obtained with the Global Positioning System: Results from the GPS/MET experiment
George A. Hajj,Larry Romans +1 more
TL;DR: The Global Positioning System Meteorology (GPS/MET) experiment, which placed a GPS receiver in a low-Earth orbit tracking GPS satellites setting behind the Earth's limb, has collected data from several thousands of occultations since its launch in April 1995.
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CHAMP and SAC-C atmospheric occultation results and intercomparisons
George A. Hajj,Chi O. Ao,Byron Iijima,Da Kuang,E. R. Kursinski,Anthony J. Mannucci,T. K. Meehan,Larry Romans,M. de la Torre Juarez,T. P. Yunck +9 more
TL;DR: In this article, the authors evaluated the accuracy of the German Challenging Minisatellite Payload (CHAMP) and the Argentine Satelite de Aplicaciones Cientificas-C (SAC-C) Earth science missions for radio occultation sounding of the ionosphere and neutral atmosphere.
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Initial Results of Radio Occultation Observations of Earth's Atmosphere Using the Global Positioning System
E. R. Kursinski,George A. Hajj,Willy Bertiger,Stephen S. Leroy,T. K. Meehan,Larry Romans,John T. Schofield,Daniel J. McCleese,William G. Melbourne,Catherine L. Thornton,T. P. Yunck,J. R. Eyre,R. N. Nagatani +12 more
TL;DR: In this paper, radio occultation measurements using Global Positioning System satellite transmitters and an orbiting receiver have provided a globally distributed set of high-resolution atmospheric profiles, suggesting that the technique may make a significant contribution to global change and weather prediction programs.