QZSS L1-SAIF Initial Experiment Results

T. Sakai, S. Fukushima, K. Ito

Abstract:	QZSS (quasi-zenith satellite system) is a Japanese satellite navigation program with a regional service coverage. The orbits for QZS (quasi-zenith satellite) are 24-hour elliptic orbit inclined 45 degrees in order to broadcast radiosignals from high elevation angle into urban canyons. QZSS will offer both supplement and augmentation signals in order to offer the maximum benefit to users. QZSS will broadcast GPS augmentation information on the GPS L1 frequency. For this purpose L1-SAIF (submeter-class augmentation with integrity function) signal has been developed based on SBAS standard because both of them offer similar function to the almost same service area. The target of user position accuracy with augmentation was set to 1 meter RMS. L1-SAIF signal will also provide the integrity function necessary for safety of mobile users. The ENRI has developed L1-SAIF Master Station (L1SMS) for the experiment of L1-SAIF and tested its function successfully with expected performance. The first QZSS satellite, QZS-1 “Michibiki”, was launched successfully on 11th Sept. 2010 from Tanegashima Space Center, Japan, and settled to the intended inclined elliptic orbit. By the end of November, initial functional checkout for satellite bus and mission equipment was completed without any major problems. Following initial functional checkout, the initial experiment has been conducted using QZS-1 on orbit. The ENRI is conducting the experiment with a car on the road because L1-SAIF signal is originally planned as an augmentation to mobile users with a certain velocity. Preliminary results show the improved accuracy by L1-SAIF augmentation.
Published in:	Proceedings of the 2011 International Technical Meeting of The Institute of Navigation January 24 - 26, 2011 Catamaran Resort Hotel San Diego, CA
Pages:	1133 - 1142
Cite this article:	Sakai, T., Fukushima, S., Ito, K., "QZSS L1-SAIF Initial Experiment Results," Proceedings of the 2011 International Technical Meeting of The Institute of Navigation, San Diego, CA, January 2011, pp. 1133-1142.
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