Remote Synchronization System of Quasi-Zenith Satellites Using Multiple Positioning Signals for Feedback Control

Toshiaki Iwata, Yoshikatsu Kawasaki, Michito Imae, Tomonari Suzuyama, Takashi Matsuzawa, Satoshi Fukushima, Yuji Hashibe, Naoto Takasaki, Kenji Kokubu, Akira Iwasaki, Fabrizio Tappero, Andrew Dempster, and Yasuhiro Takahashi

Abstract:	We have developed a new control method for the Quasi- Zenith Satellite (QZS) remote synchronization system for an onboard crystal oscillator (RESSOX). The new method utilizes both L1 and L2 positioning signals of the QZS. We also found that precise orbit information and the estimation of delays, such as those caused by the ionosphere and troposphere, are not necessary to realize the RESSOX technology. The estimation of the delays of the L1-, L2- and Ku-band signals caused by the ionosphere and other sources can be calculated separately during feedback control, and the results of Ku-band delay are used to generate the RESSOX control signal. The simulation results showed that synchronization of within 3 ns between the ground site clock and the QZS site clock is achievable. Experimental results on the ground also confirmed that synchronization within 3 ns is feasible.
Published in:	Proceedings of the 2007 National Technical Meeting of The Institute of Navigation January 22 - 24, 2007 The Catamaran Resort Hotel San Diego, CA
Pages:	427 - 435
Cite this article:	Updated citation: Published in NAVIGATION: Journal of the Institute of Navigation
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