Physics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsa23b..06l&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SA23B-06
Physics
6929 Ionospheric Physics (1240, 2400), 6934 Ionospheric Propagation (0689, 2487, 3285, 4275, 4455), 6994 Instruments And Techniques (1241), 2439 Ionospheric Irregularities
Scientific paper
Total electron content (TEC) measured between a ground receiver and a satellite transmitter requires correction for "slant," an effect that causes TEC at high zenith angles to be disproportionately larger than TEC at low zenith angles. A model ionosphere is usually assumed to convert this slant TEC to a vertical TEC using a geometric function. Instead of using a model, this investigation proposes using an empirical correction function based on combining a large number of TEC observations. This empirical correction assumes that the ionosphere is statistically smooth if considered over a long enough period. To illustrate the empirical method, slant corrections for two GPS receivers, one at high latitude and one at low latitude, were computed for a trail interval in July 2000. When compared to other slant correction functions, the empirical correction is generally "flatter" for zenith angles larger than ~35° and suggests that model corrections may be over- estimating the slant correction by as much as 60% at high zenith angles. The empirical method suggests that real slant corrections differ in local time, latitude, and azimuth in ways not accommodated by model functions. Further, the method gives a plausible way to extend GPS TEC measurements to very low elevations currently not used.
Carbary J.
Liou Kan
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