Prediction of Communication Outage Period between Satellite and Earth station Due to Sun Interference

Details Prediction of Communication Outage Period between Satellite and Earth station Due to Sun Interference Prediction of Communication Outage Period between Satellite and Earth station Due to Sun Interference

Mar 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jass...27...31s&link_type=abstract

Journal of Astronomy and Space Sciences. Vol. 27, no. 1, p. 31-42

Astronomy and Astrophysics

Astronomy

Solar Interference, Ephemeris, De406, Geostationary Satellite

Scientific paper

Geostationary satellites are located at an altitude of approximately 35,786km above the equator, and revolve in the same angular velocity as earth. Geostationary satellites can therefore, communicate with a ground earth station at all times. However, geostationary satellites also experience communication failure time, twice a year, closely one upon the other in spring and autumn quarters. The communication errors occur when ground station-satellite-the Sun are aligned closely, which occurs during spring and fall equinoxes. At such times, thermal noise emitted from the Sun's surface hits the rear side of the satellite and flows directly into the earth station antenna. This is called solar interference. Studies on duration calculation methods and prediction results of a solar interference phenomenon were implemented by many scientists (Vuong & Forsey 1983, Mohamadi & Lyon 1988, Lin & Yang 1989) abroad, and also by Lee et al. (1991) in Korea. To calculate the time of solar interference, information on precise position of the Sun and earth station antenna systems is necessary. Previous researches used the formula of Van Flandern (Van Flandern & Pulkkinen 1979) when calculating the Sun's position, but it has position error of about 1 arcmin. Using the precise ephemeris DE406, which published by NASA/JPL and the earth ellipsoid model, the study calculated the precise positioning of the Sun as causing error within 10 arcsec. For the verification of the calculation, we used TU media ground station located in Seongsu-dong and the MBSAT satellite operated by TU media.

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