Computer Science
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991crlj...38..613k&link_type=abstract
Communications Research Laboratory, Journal (ISSN 0914-9260), vol. 38, no. 3, p. 613-622.
Computer Science
Electron Energy, Ionospheric Electron Density, Very Long Base Interferometry, Calibrating, Harmonics, Least Squares Method, Quasars, Superhigh Frequencies, Ultrahigh Frequencies
Scientific paper
In very long baseline interferometry (VLBI) geodetic measurements, both X (8 GHz) and S (2 GHz) band radio signals from quasars are received in order to calibrate excess delays caused by charged particles existing along each ray path mainly due to the difference in the terrestrial ionospheric total electron content (TEC). A method of estimating TEC at each station from observed dual frequency band delays has been developed. In the estimation, daily TEC variation is modeled as the summation of Fourier components for a one day period up to 4th-order harmonics and consisting of linear terms with respect to time. Coefficients of each term are fitted by means of least squares estimation. TEC estimated from VLBI data was compared with that obtained by Faraday rotation measurements using a geostationary satellite beacon, and satisfactory agreement was found.
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