Qzss System Design And Initial Performance Verification

The Quasi-Zenith Satellite System (QZSS), a Japanese satellite navigation system, broadcasts GPS-interoperable signals and augmentation signals as well as original Japanese signals from an inclined, elliptical geosynchronous orbit. Using this system, users around Japan and Oceania can make use of seamless positioning, navigation, and timing services, even in urban canyons and mountainous areas. A government policy supports the project to promote the use of geographical spatial information linked to satellite-based navigation for a wealthy and secure life in accordance with the rapid increase of satellite navigation users nationwide. To support that policy, JAXA is in charge of developing the first stage of the QZSS in collaboration with related ministries and national research institutes.The first satellite of the Quasi-Zenith Satellite System, MICHIBIKI, was successfully launched on September 11, 2010, by a Japanese H2A launch vehicle. After a series of orbit-raising and phase adjustment maneuvers, the satellite reached its operational orbit on September 27. On-orbit checkout was started right after insertion of the operational orbit. All satellite system functions as well as functions of the newly developed on-ground control system have been verified for 3 months. This paper summarizes the design of the QZSS and describes the first results of the on-orbit checkout of the QZSS with particular emphasis on integrated system performance, not only of the flight segment but also of the ground control segment.