Determination of 3-D Positions on TBMs Using the Precise GPS Data analysis SW, GAMIT/GLOBK

정밀 GPS 해석 S/W GMAIT/GLOBK를 활용한 TBM의 3차원 위치 결정

  • 유경완 (강원대학교 대학원 토목공학과) ;
  • 양인태 (강원대학교 토목공학과) ;
  • 이동하 (강원대학교 토목공학과)
  • Published : 2016.02.29

Abstract

In this study, we determined the precise coordinates of TBMs (Tidal Bench Marks), which used as the national reference points in coastal area of Korea, using a GPS data analysis SW for the academic and scientific applications, GAMIT/GLOBK. For accurate 3-D positioning of TBM locations, we performed the GPS point surveying according to the national surveying policy and also acquired the GPS data for 48 TBMs located in the western and southern coastal part of Korea. Considering the results of baseline analysis to each observation session obtained from GAMIT module, the baseline analysis was realized to be done precisely because the values of Normalized RMS (NRMS) were mostly less than ${\pm}0.20mm$. Before the network adjustment using GLOBK module, we evaluated the suitability of observations for each session by applying the chi-squared test (${\chi}^2$ test) to the degree of freedom in observed session. An overall distributions of ${\chi}^2$ test were less than 1.0 for all sessions, and the statistical of ${\chi}^2$ test showed the average, 0.267 with minimum and maximum value, 0.063 and 0.653, respectively. Finally, we analyzed the network adjustment for 48 TBMs to reduce the residuals of baseline analysis on each point by connecting with 42 permanent GPS stations in Korea. In the network adjustment procedure, we set up the weighted values of each permanent station to be allocated between 0.9 and 1.14, and also removed the observed points having residual exceeds 4-times of standard deviation ($4{\sigma}$).

Keywords

References

  1. Kwon, J., An initial study on the unified control points, NGII Publication No. 11-1611265-000004-01, National Geographic Information Institute, Suwon, Korea, pp.123-140, 2008.
  2. Herring, T.A., King, R.W., and McClusky, S.C. (2010a) Global kalman filter VLBI and GPS analysis program, Department of Earth, Atmospheric and Planetary Sciences MIT, Massachusetts, USA, http://www-gpsg.mit.edu/-simon/gtgk/GLOBK_Ref.pdf(last date accessed: 1 March 2014).
  3. Herring, T.A., King, R.W., and McClusky, S.C. (2010b) GPS analysis at MIT, Department of Earth, Atmospheric and Planetary Sciences MIT, Massachusetts, USA, http://www-gpsg.mit.edu/-simon/gtgk/GAMIT_Ref.pdf(last date accessed: 1 March 2014).
  4. Yun, H., A study on establishment of national vertical datum surface, NGII Publication No. 11-1611265-000041-01, National Geographic Information Institute, Suwon, Korea, pp.120-133, 2010.
  5. Yun, H., A Study on the establishment of integrated geodetic network based on orthometric height, NGII Publication No. 11-1611265-000070-01, National Geographic Information Institute, Suwon, Korea, pp.25-26, 2011.