Results 121 to 130 of about 1,009 (163)

Radio Holographic Filtering of Noisy Radio Occultations

2006
We investigate algorithms for filtering noisy radio occultation data with atmospheric multipath behavior in order to improve the accuracy of the inversion based on canonical transform/full spectrum methods. The noise filtering procedure uses the compression of the signal spectrum by multiplying it with a reference signal, Fourier filtering of the ...
M. E. Gorbunov, K. B. Lauritsen
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Theory of GNSS Radio Occultation

2013
In this chapter, a brief history of the radio occultation remote sensing technique is introduced. The physical principles of GNSS radio occultation (RO) technique are discussed, and the detailed GNSS RO processing steps are presented ...
Shuanggen Jin, Estel Cardellach, Feiqin Xie   +2 more
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The Assimilation of Radio Occultation Measurements

2003
GPS radio occultation (RO) measurements are a potentially important new source of profile information that can be used in numerical weather prediction (NWP). This paper outlines the options for assimilating the RO measurements into an operational NWP system. The importance of realistic estimates for the observation error estimates is discussed.
Sean Healy, Adrian Jupp, Dave Offiler, John Eyre   +3 more
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GPS Radio Occultation with CHAMP

2003
The GPS (Global Positioning System) radio occultation experiment onboard the German CHAMP (CHAllenging Minisatellite Payload) satellite was activated in February 2001. By the end of 2001 about 36,500 occultations were recorded. We review the occultation data processing at the GFZ and discuss selected first results.
Wickert, J., Beyerle, G., Schmidt, T., Marquardt, C., König, R., Grunwaldt, L., Reigber, C.   +6 more
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Radio occultation studies with Solar Corona Sounders

Space Science Reviews, 1995
Solar Corona Sounders (SCS), a mission designed to utilize the radio occultation technique for investigations of the inner heliosphere, was submitted to ESA in response to a call for new mission concepts. The SCS platforms are two small multifrequency transmitters placed at the “anti-Earth” position (superior solar conjunction) for continuous radio ...
M. Pätzold, F. M. Neubauer, M. K. Bird
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The Ionosphere of Europa from Galileo Radio Occultations

Science, 1997
The Galileo spacecraft performed six radio occultation observations of Jupiter's Galilean satellite Europa during its tour of the jovian system. In five of the six instances, these occultations revealed the presence of a tenuous ionosphere on Europa, with an average maximum electron density of nearly 10 4 per cubic ...
A J, Kliore, D P, Hinson, F M, Flasar, A F, Nagy, T E, Cravens   +4 more
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A Distributed Environment Approach for the GPS Radio Occultation Analysis

2009 Fifth International Conference on Networking and Services, 2009
In this paper we describe this new scenario for the Radio Occultation data processing, which is based to the use of distributed system architecture. In particular, we describe our approach based on using a Grid computing system in order to decrease the calculation of RO time and to increase the flexibility and reliability of the system.
O. TERZO, L. MOSSUCCA, RUIU, PIETRO, M. MOLINARO, NOTARPIETRO, RICCARDO, CUCCA, MANUELA, S. STIGLIANO   +6 more
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Turbulence in deep radio occultations

Radio Science, 1981
We investigate here the effect of turbulence in the focal region of spherical or weakly oblate refracting bodies by establishing weak scattering results for the scintillation index and power spectrum. If the spacecraft is a distance r⊥ from the focus in the plane of the sky, we find that initial focusing alone yields an increase in scintillation index ...
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An Overview on GNSS Radio Occultation

2010
An overview on GNSS Radio Occultation (GNSS-RO) technique and its application in geodesy and atmospheric research was presented at the Institute of Astronomical and Physical Geodesy (APMG), University of Bonn in Germany, on 13th July 2010.
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An Overview of Atmospheric Radio Occultation

Journal of Global Positioning Systems, 2002
Thomas P. Yunck, holds a bachelor's degree in electrical engineering from Princeton University and a Ph.D. in systems and information science from Yale University. Since 1978 he has been with the Jet Propulsion Laboratory, California Institute of Technology, where he currently manages the GPS Observatories Office. At JPL, Dr. Yunck has been involved in
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