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†,**,*** Graduate school of Inha University, Incheon 402-751, Korea* Department of Geoinformatic Engineering, Inha University, Incheon 402-751, Korea**** School of Mechanical and Aerospace Engineering, Seoul National University, Seoul 151-744, Korea  :  DGNSS           TEQC   .    GPS         .   TEQC      .   GPS         .             .                 .                .  2     GPS      . : NDGPS, , , TEQC, Abstract : The DGNSS Central Office operates 17 DGNSS reference stations. Compared to the other DGNSS sites, the TEQC data quality of some sites is poorer. In this study, we tried to find out the causes that degrade the quality of GPS data for the purpose of improving the signal quality of the DGNSS stations. We selected the Chungju station that is the one of those stations with bad data quality. Through the on-site visit, we found that there is no signal-blocking obstacles. In addition to site surveys, we conducted two experiments; simultaneous observation considering environmental factors and comparison test through equipment replacements to check the malfunctioning of GPS equipments. In the simultaneous test results, we realized that environmental factors do not induce any bad effects on the data quality. In equipment replacement experiments, we confirmed that the data quality is of excellent quality when the test receiver was used instead of the original one installed at the site. When we replaced the antenna instead of the receiver, the data quality was bad. Through those two experiments, we concluded that the receiver is the main factor that degrades the signal quality.Key words :NDGPS, signal quality, signal environment, TEQC, comparative experiments † : , dhsohn5@gmail.com 032)873-4310 * , kdpark@inha.ac.kr 032)860-7604 ** , hikim0619@inha.edu 032)873-4310*** , dskim@inha.edu 032)873-4310*** , kee@snu.ac.kr 02)880-1912

Comparative Experiments for the Improvement of NDGPS Signal Quality