Accuracy and reliability in GNSS NRTK

The work shows the results of testing conducted from 2008 to 2009 within the Network-based RTK GNSS of University of Palermo. The network is composed of eight Continuously Operating Reference Stations (CORS) located in western Sicily and managed by a Control Centre located at the Dipartimento di Rappresentazione (DIRAP) of University of Palermo. The main goal of the work is to verify the reliability of the CORS network (successful tests, failed initialization time, satellite configurations) and the accuracy of measurements positioning using VRS, FKP and Nearest Station techniques. The reliability was considered the probability that the operator can correctly determine its position within the CORS network, depending on the method of calculation used in surveys conducted in different areas and in different days. Accuracy was determined by comparing the coordinates of several points calculated in post-processing and NRTK surveys.