Comparative Experiments for the Improvement of NDGPS Signal Quality

Sohn, Dong-Hyo; Park, Kwan-Dong; Kim, Hye-In; Kim, Dusik; Kee, Changdon

Journal of Navigation and Port Research 2012;36(8):625-630.
Published online October 31, 2012.

NDGPS 관측자료의 품질향상을 위한 비교실험

손동효, 박관동, 김혜인, 김두식, 기창돈

Comparative Experiments for the Improvement of NDGPS Signal Quality

Dong-Hyo Sohn, Kwan-Dong Park, Hye-In Kim, Dusik Kim, Changdon Kee

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