The Operational Phase Performance of Centimeter-Level Augmentation Service (CLAS)

The operational service of CLAS of Japan Quazi-Zenith-Satellite-System (QZSS), a nation-wide satellite-based PPP-RTK service in Japan having the centimeter level positioning accuracy begun on November 1, 2018. In this paper, the result of continuous performance evaluation on the multiple stations of the Japan CORS network is presented, the positioning accuracy and the time-to- ambiguity fix (TTFF) evaluated in the static and kinematic condition. A kinematic van test result applying CLAS correction with a prototype GNSS receiver is also presented, it is confirmed that the positioning accuracy comparable with the conventional RTK. In this performance evaluation, CLAS Test Library (CLASLIB), open-source software tools for PPP-RTK based on RTKLIB is introduced and applied.