Currently in Korea, the total number of 96 Operating Reference Station (CORS) are operated in DGNSS Central Office and Korea Astronomy and Space Science Institute, and National Geographic Information Institute. Those sites provide services of the GNSS raw data using the RINEX format. But the total number of stations increases, so the number of station with poor GNSS data quality also increases. Accordingly, Dusitech has developed software for the data quality analysis using the real-time RINEX data every 5 minutes. With this software, the each site’s distributed data is collected and the GNSS data quality is analyzed. The results are expected to using the real-time GNSS quality service in Korea Space Weather Center.

Keywords: QC, observation, multi-path, cycle-slip