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Author: search.filters.author.Igarashi, K.

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    Rain attenuation of satellite link in Ku-band at Bangkok
    (2005-12-01)
    Boonchuk, T.
    ;
    Hemmakorn, N.
    ;
    Supnithi, P.
    ;
    Iida, M.
    ;
    Tanaka, K.
    Rain attenuation is a major factor to degrade the system performance in a frequency above 10 GHz. This paper presents a statistical analysis of the rainfall rate and the rain attenuation data on satellite to ground propagation path. By measuring 12.7-GHz beacon signal attenuation from JCSAT satellite and the rainfall rate continuously. Yearly cumulative distribution functions were then compared to predicted models. The Crane Global model for the rain zone H provides overestimated predicted values to the measured ones. For the rain zone G, the Crane Global model provides close values to ITU-R model; both are smaller than the measured ones. © 2005 IEEE.
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    Total ionospheric electron content observation and ETS-V beacon experiment for studying GHz-band scintillation in the equatorial zone
    (1997-01-01)
    Igarashi, K.
    ;
    Nagayama, M.
    ;
    Ohtani, A.
    ;
    Hamamoto, N.
    ;
    Hashimoto, Y.
    A L-band CW-beacon experiment using ETS-V satellite for mobile satellite communications experiments was made with the small satellite ground stations installed at Fiji, Indonesia, Papua New Guinea, Thailand and Japan in order to study propagation effects on satellite-to-ground-links in the equatorial zone. GPS observations of total ionospheric electron content and monitoring of geomagnetic variations were started at the same ground stations in Bandung, Indonesia and Bangkok, Thailand from November, 1993. During the severe ionospheric disturbances on February 22, 1994 Japanese Broadcasting Satellite BS-3a stopped its broadcasting for about one hour by an unexpected satellite trouble. We focused on this event by comparing between TEC observed in low-latitude and mid-latitude of northern hemisphere. The cause of this sattelite trouble is supposed mainly by the electric static discharge (ESD) in the satellite. The severe geomagnetic storm on 21 February, 1994 is related in this paper as one of the cause for this satellite trouble. ©1997 COSPAR. All rights reserved.