Computer Science – Performance
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa33b0274c&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SA33B-0274
Computer Science
Performance
2400 Ionosphere (6929), 2447 Modeling And Forecasting, 2494 Instruments And Techniques
Scientific paper
The lack of accuracy of ionospheric models in specifying the variability of electron density in the ionosphere has placed significant limitations on the performance of navigation, communication, and surveillance systems based on radio wave propagation. The existing operational data assimilation models that calculate the TEC and electron density distribution in the ionosphere use observations from networks of ground-based GPS receivers and a priori information from a model. Ground-based GPS data provide accurate information about the horizontal electron density gradients, but limited information about the vertical gradients. In addition, the ability of a network of ground-based GPS receivers to measure the detailed ionospheric structure critically depends on the density of the GPS receivers. On the other hand, radio occultation data obtained from the low-Earth orbit (LEO) satellites equipped with GPS receivers contain high-resolution information about the vertical gradients and entangled information about the horizontal gradients. In this paper we present preliminary results obtained from a test-bed for assessing the importance of different data sets, such as ground-based GPS and COSMIC occultation data, in the assimilation of measurements that specify the electron density distribution in the ionosphere.
Anghel Adela
Araujo E. A.
Codrescu Mihail V.
Fuller-Rowell Tim
Minter C. F.
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