14:30 〜 14:45
[SGD01-16] 低価格多周波GNSS観測システムの開発とその性能評価
キーワード：GNSS、低廉GNSS
Observation of crustal deformation by GNSS is quite important to understand the strain accumulation near the active fault and the volcanic activities. On the other hand, the cost of the GNSS observation system for geodetic purpose is still expensive, which is an impediment to improving the density of the observation sites. In contrast, low-cost GNSS chips have been introduced for purposes other than the geodetic applications. Therefore, the purpose of this study is to develop a new GNSS observation system for long-term continuous observation and campaign observation using these consumer-use GNSS chips and to evaluate its performance.
We adopted the ublox ZED-F9P chips as the core GNSS engine. The F9P is a multi-band GNSS module. The module enables precise navigation and automation of moving industrial machinery. In contrast, there are few prior examples of the use of ZED-F9P for observation of the crustal deformation. Thus, we developed an observation system that combines ZED-F9P and Rasberry Pi. The developed system can record the GNSS carrier phase and pseudo range data. The ZED-F9P can supplement GPS L2C signals, but it does not support L2P signals. Therefore, there is a problem that the number of satellites in the L2 band is reduced when analyzing only GPS.
For comparison, signals from the antennas at the AOBL site, which is observed at Tohoku University, were split and recorded simultaneously by the Leica GRX1200+GNSS, a receiver for geodetic observations, and the developed system. As a tentative result, the carrier phase data for one day recorded by the developed system and conventional geodetic receiver system were analyzed by PPP of GIPSY-OASIS to obtain the daily coordinate values. We only sed GPS satellite system. We calculated the standard deviation of the time series between DOY 29 to 41 in 2021. The calculated SD was 5.3mm, 2.9mm, and 10.6mm for EW, NS, and UD component, respectively. In contrast, the result from conventional geodetic receiver system was 2.3mm, 1.6mm, and 7.4mm for EW, NS, and UD component, respectively. It should be caused by the lack of the L2P signal. In the presentation, the observation system developed in more detail will be discussed.
We adopted the ublox ZED-F9P chips as the core GNSS engine. The F9P is a multi-band GNSS module. The module enables precise navigation and automation of moving industrial machinery. In contrast, there are few prior examples of the use of ZED-F9P for observation of the crustal deformation. Thus, we developed an observation system that combines ZED-F9P and Rasberry Pi. The developed system can record the GNSS carrier phase and pseudo range data. The ZED-F9P can supplement GPS L2C signals, but it does not support L2P signals. Therefore, there is a problem that the number of satellites in the L2 band is reduced when analyzing only GPS.
For comparison, signals from the antennas at the AOBL site, which is observed at Tohoku University, were split and recorded simultaneously by the Leica GRX1200+GNSS, a receiver for geodetic observations, and the developed system. As a tentative result, the carrier phase data for one day recorded by the developed system and conventional geodetic receiver system were analyzed by PPP of GIPSY-OASIS to obtain the daily coordinate values. We only sed GPS satellite system. We calculated the standard deviation of the time series between DOY 29 to 41 in 2021. The calculated SD was 5.3mm, 2.9mm, and 10.6mm for EW, NS, and UD component, respectively. In contrast, the result from conventional geodetic receiver system was 2.3mm, 1.6mm, and 7.4mm for EW, NS, and UD component, respectively. It should be caused by the lack of the L2P signal. In the presentation, the observation system developed in more detail will be discussed.