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Dynamic Orbit Determination for Geostationary Satellite Broadcasting of Highly Accurate Standard Frequency/Time Signal  

이기훈 (연세대학교 전기전자공학과 디지털전송연구실)
윤재철 (연세대학교 천문우주학과)
서종수 (연세대학교 전기전자공학과 디지털전송연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.27, no.4B, 2002 , pp. 331-337 More about this Journal
Abstract
In this paper we propose extended Kalman filter (EKF)-trilateration method which associates EKF to conventional radiolocation technique, trilateration in order to improve the accuracy of dynamic orbit determination of geostationary satellite for broadcasting of highly accurate Standard Time/Frequency Signal (STFS). We then compare to analyze the time accuracies of three techniques which are differential mode, trilateration locating one of four calibrated earth stations on a neighboring country, and domestic-only baseline EKF-trilateration. Computer simulations have shown that in spite of domestic-only baseline EKF-trilateration of poor GDOP, it is possible to track and locate satellite with an accuracy of a few hundred meter which is the performance 10 times more accurate than trilateration can provide. Finally we can provide standard time service with the time accuracy better than a few ns (frequency stability : 10$\^$-14/ over 7 days) all around Korea peninsula.
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