Improvement of Reception and Transmission Performance on Early Warning System for Multi Country with QZSS Augmentation Signal
Daisuke Iwaizumi*, Shota Iino*, Hiroki Satoh**, Mitsuaki Takaishi**, Naoki Iso**, and Naohiko Kohtake*
*Graduate School of System Design and Management, Keio University, 4-1-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8526, Japan
**NTT DATA, 3-3-9, Toyosu, Koto-ku, Tokyo 135-6017, Japan
Information blackout may occur in which it becomes difficult to obtain required information because information infrastructures have been destroyed. Infrastructures for providing disaster information are vulnerable in some Asian regions, so it is vital to cover such blanks to minimize damage. Much attention has been given to a method for communicating disaster information to GNSS receivers installed on cell phones and in car navigation systems. Augmentation of signals from quasi-zenith satellite (QZS) are used independent of terrestrial information infrastructures. Information capacity using QZS augmentation signals is low, however, and elevation angles in some Asian countries varies due to satellite orbits, meaning that the methods of the distribution and reception performance of disaster information should be investigated. This study has the objective of formulating a system for distributing disaster information using augmentation signals from QZS, the system prototype. This prototype was designed for large-scale disasters across multiple Asian and Oceanic regions such as Indian Ocean tsunamis. The system’s effectiveness is evaluated in distribution and receiving performance, so the designed message formats and resulting distribution schedule show system effectiveness in of distribution performance. In simultaneous receiving experiments in two countries, common information and area- and country-based information were received, indicating the effectiveness of the system in receiving performance across multiple countries.
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