Anomalies Influence Analysis of the Remote Synchronization System Ressox for the Japanese Quasi-zenith Satellite System
نویسندگان
چکیده
The remote synchronization system RESSOX is a novel concept for a GNSS time keeping system that does not require an on-board atomic clock. RESSOX has been presented as an alternative to the classic GPS scheme and was specifically designed for the Japanese augmentation system QZSS (Quasi-Zenith Satellite System). According to the RESSOX structure, QZSS satellites will carry light and inexpensive clocks that are remotely synchronized to a main atomic clock located in the master ground station. The positioning performance of the whole augmentation system is directly influenced by the quality of the synchronization network. Moreover, there are unavoidable events that could stress the behavior of the synchronization network or periods of time when the synchronization cannot be controlled. During these periods the synchronization network cannot be utilized, and satellite clocks will have to be on their own (free-run case). This paper presents an analysis of the positioning performance of the GPS plus QZSS positioning system when anomalies in the remote synchronization scheme occurs and the RESSOX cannot be employed. QZSS satellite on-board time reference and ground atomic clock de-synchronization failures are studied, recreated and their effects on the positioning are analyzed by means of a dedicated software simulator.
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