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http://dx.doi.org/10.7848/ksgpc.2011.29.3.293

Generation of Korean Ionospheric Total Electron Content Map Considering Differential Code Bias  

Lee, Chang-Moon (인하대학교 사회기반시스템공학부 지리정보공학과)
Kim, Ji-Hye (인하대학교 사회기반시스템공학부 지리정보공학과)
Park, Kwan-Dong (인하대학교 사회기반시스템공학부 지리정보공학과)
Publication Information
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography / v.29, no.3, 2011 , pp. 293-301 More about this Journal
Abstract
The ionospheric delay is the largest error source in GPS positioning after the SA effect has been turned off in May, 2000. In this study, we used 44 permanent GPS stations being operated by National Geographic Information Institute (NGII) to estimate Total Electron Content (TEC) based on pseudorange measurements phase-leveled by a linear combination with carrier phases. The Differential Code Bias (DCB) of GPS satellites and receivers was estimated and applied for an accurate estimation of the TEC. To validate our estimates of DCB, changes of TEC values after DCB application were investigated. As a result, the RMS error went down by about an order of magnitude; from 35~45 to 3~4 TECU. After the DCB correction, ionospheric TEC maps were produced at a spatial resolution of $1^{\circ}{\times}1^{\circ}$. To analyze the effect of the number of sites used for map generation on the accuracy of TEC values, we tried 10, 20, 30, and 44 stations and the RMS error was computed with the Global Ionosphere Map as the truth. While the RMS error was 5.3 TECU when 10 sites are used, the error reduced to 3.9 TECU for the case of 44 stations.
Keywords
Ionosphere; Differential Code Bias; Total Electron Content; GPS;
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Times Cited By KSCI : 4  (Citation Analysis)
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