Search | Korea Science

Sohn, Dong Hyo;Kim, Du Sik;Park, Kwan Dong
- Journal of Korean Society for Geospatial Information Science
- /
- v.23 no.1
- /
- pp.47-54
- /
- 2015
In this study, we developed strategies for pre-processing GNSS data for the purpose of separating geodetic factors from crustal deformation due to the earthquakes. Before interpreting GNSS data analysis results, we removed false signals from GNSS coordinate time series. Because permanent GNSS stations are located on a large tectonic plate, GNSS position estimates should be affected by the tectonic velocity of the plate. Also, stations with surrounding trees have seasonal signals in their three-dimensional coordinate estimates. Thus, we have estimated the location of an Euler pole and angular velocities to deduce the plate tectonic velocity and verified with geological models. Also, annual amplitudes and initial phases were estimated to get rid of those false annual signals showing up in the time series. By considering the two effects, truly geodetic analysis was possible and the result was used as preliminary data for analyzing post-seismic deformation of the Korean peninsula due to the Tohoku-oki earthquake.
https://doi.org/10.7319/kogsis.2015.23.1.047 인용 PDF KSCI

Park, Joon-Kyu;Kim, Min-Gyu
- Journal of the Korea Academia-Industrial cooperation Society
- /
- v.14 no.9
- /
- pp.4587-4592
- /
- 2013
GPS is recognized the essential method to obtain the best result in the sphere of earth science that is setting of International Reference Frame, decision of the rotation coefficient about the earth rotation axis, detection of the crustal deformation, and observation of the diastrophism by high precision positioning except for navigation, geodetic survey and mapping. Therefore, in this study, it was attempted to build an expert service that enables non-experts to use high-precision GPS data processing. As a result, an Precise Point Positioning Solution that can maximize user convenience simply by entering the minimum required information for GPS data processing was developed, and the result of Precise Point Positioning Solution using GPS data provided by National Geographic Information Institute was compared with result of ITRF.
https://doi.org/10.5762/KAIS.2013.14.9.4587 인용 PDF KSCI

Cho, Jae-Myoung;Yun, Hong-Sik;Lee, Mi-Ran
- Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
- /
- v.29 no.3
- /
- pp.237-247
- /
- 2011
As of 2011, 72 Permanent GPS Stations are installed to control DGPS reference points by the National Geographic Information Institute in South Korea. As the center of the Earth's mass continues to move, the coordinates of the permanent GPS stations become inconsistent over time. Thus, a reference frame using a set of coordinates and their velocities of a global network of stations at a specific period has been used to solve the inconsistency. However, the relative movement of the permanent GPS stations can lower the accuracy of GPS relative positioning. In this research, we first analyzed the data collected daily during the past 30 months at the 40 permanent GPS stations within South Korea and the 5 IGS permanent GPS stations around the Korean Peninsula using a global network adjustment. We then calculated the absolute and relative amount of movement of the GPS permanent stations. We also identified the optimum renewal period of the permanent GPS stations considering the accuracy of relative GPS surveying. Finally, we developed a Korean a Korean crustal movement model that can be used to improvement of accuracy.
https://doi.org/10.7848/ksgpc.2011.29.3.237 인용 PDF KSCI