Physics
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jatp...49...99s&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 49, Jan. 1987, p. 99-103.
Physics
Atmospheric Refraction, Microwave Transmission, Multipath Transmission, Radio Wave Refraction, Ultrahigh Frequencies, Radio Interferometers, Satellite Tracking, Tracking Radar, Traveling Ionospheric Disturbances
Scientific paper
From January 1971 to March 1973 the Millstone Hill L-band satellite tracking radar was employed in a study of ionospheric refraction. Satellites of the Navy Navigation Satellite System were tracked smoothly by radar at 1295 MHz. Simultaneously, the apparent position of the satellite was sensed passively by receiving (on the same antena) the UHF beacon signals. After taking into account ionospheric refraction effects, quasi-sinusoidal fluctuations were observed in the apparent positions of satellites. The investigators interpreted these fluctuations as traveling ionospheric disturbances. These waves should have wavelengths typically in the range 30-60 km. They were seen at low elevations equally frequently at all local times and seasons. However, it turns out that these traveling ionospheric disturbances were not observed by differential Doppler measurements of the same satellites and by radio interferometry. Reconsideration of these observations and their interpretation leads to the suggestion that these fluctuations do not result from ionospheric irregularities but are due to multipath propagation effects.
Kelder Hennie
Spoelstra Titus A. Th.
Sukumar S.
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