In this study, The code-carrier divergence test was applied to GPS measurements, and the results were compared and analyzed. The GPS data used for the threshold determination were obtained from Global Navigation Satellite System permanent stations built by the Korea Aerospace Research Institute. At each permanent station, identical dual-frequency receiver and choke ring antenna with radome are installed. The analysis method, root mean square values were compared and analyzed for each permanent station and satellite. As a result, the root mean square value generally decreased as the satellite elevation angle increased although the trend was gentle. Threshold were finally selected based on the average and standard deviation of root mean square for each permanent station. For improving of availability and continuity in real-time operation when the threshold is over the limits, Code-Carrier divergence test values are initialized.

A Global Navigation Satellite System (GNSS) was developed for military purposes, but it is currently also used in various civilian fields (e.g., land transportation, shipping, and aviation) (Son et al. 2013). GNSS can determine the position of a receiver using the measurements of signals received from at least four satellites. Accordingly, GNSS is used for positioning in relation to traffic, geodetic survey, and surveying, and also widely used for time synchronization, weather monitoring, etc. (Lee et al. 2013). The economic and social importance of GNSS is well known. Therefore, many countries in the world have made efforts to establish their own GNSS. Starting with the Global Positioning System (GPS) from the United States, the development of the GLObal NAvigation Satellite System from Russia has been completed; and Galileo from Europe,

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