Phase acceleration: a new important parameter in GPS occultation technology |
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Authors: | A G Pavelyev Y A Liou J Wickert T Schmidt A A Pavelyev |
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Institution: | (1) Institute of Radio Engineering and Electronics of Russian Academy of Sciences (IRE RAS), Fryazino, Vvedenskogo sq. 1, 141190 Moscow, Russia;(2) Center for Space and Remote Sensing Research, National Central University, Chung-Li, 320, Taiwan;(3) GeoForschungsZentrum Potsdam (GFZ-Potsdam), Telegrafenberg, 14473 Potsdam, Germany |
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Abstract: | Based on 40 years of radio-occultation (RO) experiments, it is now recognized that the phase acceleration of radio waves (equal
to the time derivative of the Doppler shift), derived from analysis of high-stability Global Positioning System (GPS) RO signals,
is as important as the Doppler frequency. The phase acceleration technique allows one to convert the phase and Doppler frequency
changes into refractive attenuation variations. From such derived refractive attenuation and amplitude data, one can estimate
the integral absorption of radio waves. This is important for future RO missions when measuring water vapor and minor atmospheric
gas constituents, because the difficulty of removing the refractive attenuation effect from the amplitude data can be avoided.
The phase acceleration technique can be applied also for determining the location and inclination of sharp layered plasma
structures (including sporadic E
s layers) in the ionosphere. The advantages of the phase acceleration technique are validated by analyzing RO data from the
Challenging Minisatellite Payload (CHAMP) and the FORMOSA Satellite Constellation Observing Systems for Meteorology, Ionosphere,
and Climate missions (FORMOSAT-3/COSMIC). |
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