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http://dx.doi.org/10.11003/JPNT.2022.11.4.251

Monitoring QZSS CLAS-based VRS-RTK Positioning Performance  

Lim, Cheolsoon (Department of Aerospace Engineering, Sejong University)
Lee, Yebin (Department of Aerospace Engineering and Department of Convergence Engineering for Intelligent Drone, Sejong University)
Cha, Yunho (Department of Aerospace Engineering and Department of Convergence Engineering for Intelligent Drone, Sejong University)
Park, Byungwoon (Department of Aerospace Engineering and Department of Convergence Engineering for Intelligent Drone, Sejong University)
Park, Sul Gee (Maritime PNT Research Office)
Park, Sang Hyun (Maritime PNT Research Office)
Publication Information
Journal of Positioning, Navigation, and Timing / v.11, no.4, 2022 , pp. 251-261 More about this Journal
Abstract
The Centimeter Level Augmentation Service (CLAS) is the Precise Point Positioning (PPP) - Real Time Kinematic (RTK) correction service utilizing the Quasi-Zenith Satellite System (QZSS) L6 (1278.65 MHz) signal to broadcast the Global Navigation Satellite System (GNSS) error corrections. Compact State-Space Representation (CSSR) corrections for mitigating GNSS measurement error sources such as satellite orbit, clock, code and phase biases, tropospheric error, ionospheric error are estimated from the ground segment of QZSS CLAS using the code and carrier-phase measurements collected in the Japan's GNSS Earth Observation Network (GEONET). Since the CLAS service begun on November 1, 2018, users with dedicated receivers can perform cm-level precise positioning using CSSR corrections. In this paper, CLAS-based VRS-RTK performance evaluation was performed using Global Positioning System (GPS) observables collected from the refence station, TSK2, located in Japan. As a result of performing GPS-only RTK positioning using the open-source software CLASLIB and RTKLIB, it took about 15 minutes to resolve the carrier-phase ambiguities, and the RTK fix rate was only about 41%. Also, the Root Mean Squares (RMS) values of position errors (fixed only) are about 4cm horizontally and 7 cm vertically.
Keywords
CLAS; compact SSR; QZSS; RTK;
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