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Chalermchon Satirapod,Sarandhorn Bamrungwong,Christophe Vigny,이흥규 대한토목학회 2010 KSCE JOURNAL OF CIVIL ENGINEERING Vol.14 No.2
During the period 1994-2004, before the Mw 9.3 Sumatra-Andaman earthquake of 26 December 2004, Thailand was moving horizontally constantly eastward with an average rate of approximately 33.2±1.1 millimeters per year in ITRF2000. The magnitude of the horizontal strain rate was less than 30 nanostrain per year, which was considered small but significant. After the occurrence of the mega thrust earthquake, a horizontal movement to the southwest direction is evident at different rates all over the Thai region. Large co-seismic horizontal displacements were observed in the southern part of Thailand, while moderate and small displacements were seen in the central and northern parts of Thailand. The Royal Thai Survey Department (RTSD) carried out multiple Global Positioning System (GPS) field campaigns to monitor the post-seismic displacements. However, their efforts were complicated by the second mega thrust (Mw8.7) earthquake, which occurred at Nias, Sumatra on 28 March 2005. This study focuses on the use of GPS data, collected between 1994 and 2006, gathered from six GPS stations located at Phuket, Chumporn, Chonburi, Uthaitani,Srisaket and Lampang in Thailand and an additional station located in the northern part of Malaysia to derive changes in the strain rate. Here we find that today’s deformation in Thailand is dominated by SW-NE trending extension. This feature is in agreement with post-seismic relaxation occurring on the Sumatran trench.
Dumrongchai, Puttipol,Buatong, Titin,Satirapod, Chalermchon,윤성현 한국측량학회 2022 한국측량학회지 Vol.40 No.4
The evolution of the GNSS (Global Navigation Satellite System) technology has enhanced positioningperformance in terms of positioning accuracy and time efficiency. The technology makes it possible to determineorthometric heights at a few centimeter accuracies by transforming accurate ellipsoid heights if an accurategeoid model has been employed. This study aims to generate a correction surface using GNSS/leveling copointsand a local geoid model, Thailand Geoid Model 2017 (TGM2017), through the Kriging interpolationmethod in a small local area. Combining the surface and TGM2017 significantly improves height transformationwith the 1-cm RMSE (Root Mean Square Error) fit of 10 GNSS/leveling reference points and a mean offset of+0.1 cm. The evaluation of the correction surface at 5 GNSS/leveling checkpoints shows the RMSE of 1.0 cm,which is 82.6 percent of accuracy improvements. The GNSS leveling method can possibly be used to replace aconventional leveling technique at a few centimeter uncertainties in the case of small areas with clear-sky andhigh satellite visibility environments.
Tsujii, Toshiaki,Fujiwara, Takeshi,Kubota, Tetsunari,Satirapod, Chalermchon,Supnithi, Pornchai,Tsugawa, Takuya,Lee, Hungkyu Korean Society of Surveying 2012 한국측량학회지 Vol.30 No.6
Ionospheric anomaly is one of the major error sources which deteriorate the GNSS performance. In the equatorial region, effects of the ionospheric plasma bubbles are of great interest because they are pretty common phenomena, especially in the period of the high solar activity. In order to evaluate the GNSS performance under circumstance of the bubbles, an ionospheric scintillation monitor has been developed and installed in Bangkok, Thailand. Furthermore, a model simulating the ionospheric delay and scintillation due to the bubbles has been developed. Based on these developments, the effects of the simulated plasma bubbles are analyzed and their agreement with the real observation is demonstrated. An availability degradation of the GPS ground based augmentation system (GBAS) caused by the bubbles is exampled in details. Finally, an integrated GPS/INS approach based on the Doppler frequency is proposed to remedy the deterioration.