Comparison of Classic RTK and Network-RTK Methods

Today, GNSS is being used widely in determination of point positions. The intense use of this technology created the need of real time kinematic determination of point positions with high accuracy and precision. As a result, firstly Standard (Classic) RTK technique and later Network RTK technique were developed. Nowadays, in many countries, there are Continuously Operating Reference Station (CORS). In Turkey, A system, CORS-TR, operating from May 2009 was established. This system covers the hole country and comprises 146 station (including 4 stations in KKTC). In this study, the real time position data were determined in ten zones with 30 points having a distance of 1 to 10 km from a base station by means of classical RTK methods using both GPS and GPS+GLONASS satellites. The obtained results were compared with the Net-RTK coordinates measured separately from each zone as well as with the coordinates of all points without making a distinction among zones. With this comparison, the impact of the distance of rover receiver to the base station on the position accuracy has been investigated. After evaluating the obtained data, it has been seen that the distance of the rover receivers to the base stations and the barriers such as buildings, airport, overpass etc. around the study area have significant impact on the accuracy of position.After evaluating the results obtained from the test fields, it is found that the differences and the root mean square (rms) in x and y directions of the coordinates measured by Net-RTK and Classical RTK methods are 0,2 -9,0 cm , and ±1.28 cm. - ±4.39 cm. respectively, and the difference in z direction range from 0.1 cm. to 15.7 cm. and the rms change between ±2.21 cm. - ±7.81 cm.