2:30 PM - 2:45 PM
[SCG53-04] Development of GNSS Real-time analysis including QZSS
Keywords:REGARD, GEONET, PPP, QZSS
Displacement obtained by real-time GNSS positioning isn’t saturate for large earthquakes, which directly measure the amount of ground deformation. The Geospatial Information Authority of Japan (GSI) operates REGARD (REal-time GEONET Analysis system for Rapid Deformation monitoring), which estimates a finite fault model based on a continuous GNSS observation network called GEONET.
REGARD conducts real-time kinematic (RTK) analysis using data from two observation points, but if one of the observation stops, the solution cannot be obtained. In particular, if the observation stops at a reference station, the effect will spread to results of all other stations. In addition, earthquakes that occur in the vicinity of a reference station have the weakness of making it appear as if crustal movement has occurred all over Japan. In order to overcome these weaknesses of relative positioning, we attempted to introduce Precise Point Positioning (PPP), which does not have the disadvantages of relative positioning because PPP can perform positioning alone. However, various kinds of correction information is required for accurate PPP.
In this study, we performed real-time PPP positioning by estimating satellite orbits and clocks in real time, including the Japanese positioning satellite MICHIBIKI (QZSS), and generating correction information. In this presentation, we present the results of our research and report the evaluation of the accuracy of real-time PPP, the comparison result with REGARD.
REGARD conducts real-time kinematic (RTK) analysis using data from two observation points, but if one of the observation stops, the solution cannot be obtained. In particular, if the observation stops at a reference station, the effect will spread to results of all other stations. In addition, earthquakes that occur in the vicinity of a reference station have the weakness of making it appear as if crustal movement has occurred all over Japan. In order to overcome these weaknesses of relative positioning, we attempted to introduce Precise Point Positioning (PPP), which does not have the disadvantages of relative positioning because PPP can perform positioning alone. However, various kinds of correction information is required for accurate PPP.
In this study, we performed real-time PPP positioning by estimating satellite orbits and clocks in real time, including the Japanese positioning satellite MICHIBIKI (QZSS), and generating correction information. In this presentation, we present the results of our research and report the evaluation of the accuracy of real-time PPP, the comparison result with REGARD.