Results 231 to 240 of about 896,848 (251)

Radio occultation data analysis by the radioholographic method

Journal of Atmospheric and Solar-Terrestrial Physics, 1999
The radioholographic method is briefly described and tested by using data of 4 radio occultation events observed by the GPS/MET experiment on 9 February 1997. The central point of the radioholographic method (Pavelyev, 1998) is the generation of a radiohologram along the LEO satellite trajectory which allows the calculation of angular spectra of the ...
Hocke, K., Pavelyev, A. G., Yakovlev, O. I., Barthès, Laurent, Jakowski, N.   +4 more
openaire   +6 more sources

GNSS Interferometric Radio Occultation

IEEE Transactions on Geoscience and Remote Sensing, 2016
GNSS Reflectometry, Scatterometry and Radio Occultation aboard ISS is the mission concept under study within the European Space Agency. Its core payload consists of an interferometric GNSS-Reflectometry ocean altimeter/scatterometer which does not need to generate any clean replicas of the GNSS codes for its operation.
openaire   +1 more source

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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A search for the radio occultation flash at Jupiter

Journal of Geophysical Research: Space Physics, 1981
The ‘evolute flash,’, a focusing effect caused by the curvature of a planet's limb, was sought in the radio data taken during the occultation of Voyager 1 by Jupiter, using a modified matched‐filter technique. The expected frequency structure of the flash signal is double branched, while the intensity structure is highly localized in time.
G. E. Wood, G. F. Lindal, Von R. Eshleman, J. M. Martin, G. L. Tyler   +4 more
openaire   +2 more sources

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.
Dave Offiler, Adrian Jupp, Sean Healy, John Eyre   +3 more
openaire   +2 more sources

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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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 ...
Martin Pätzold, Michael K. Bird, Fritz M. Neubauer   +2 more
openaire   +2 more sources

Radio occultation experiments with Comet Halley

Advances in Space Research, 1984
Abstract Previous radio occultation investigations on cometary comae and tails have included refraction measurements and intensity scintillations of natural radio sources used to derive the density and structure of the cometary plasma. Significant improvements in the coverage and sensitivity of these measurements will be achieved during the present ...
Peter Edenhofer, H. Porsche, H. Volland, Michael K. Bird   +3 more
openaire   +2 more sources

Theory of radio occultation by Saturn's rings

Icarus, 1982
The radio occultation technique, as applied to Saturn's rings, is developed as a new method for the study of the physical properties of planetary ring systems. The rings are treated as a Doppler-spread radar target composed of an ensemble of discrete scatterers.
Essam A. Marouf, G. L. Tyler, Von R. Eshleman   +2 more
openaire   +2 more sources

Occultation of a Radio Star by the Solar Corona

Nature, 1952
IT has been suggested1 that the radiation from a radio star might be cut off by refraction in the solar corona, even when the angular separation of the sun and the star is several times the angular radius of the visible disk (R⊙). The existing data on the coronal electron density have been used for predicting the effective radius of the sun for ...
K. E. Machin, F. G. Smith
openaire   +2 more sources