XXIX International Symposium on “Modern Technologies, Education and Professional Practice in Geodesy and Related Fields”, İstanbul, Turkey, 5 - 06 November 2019, vol.1, no.15, pp.27
Real Time Network GNSS (RTN GNSS) measurements like other survey measurements are not devoid of errors. The aim of this study is to show that RTN results can seriously be degraded by obstructions such as trees, buildings. This paper shows the investigations of the positioning error sources, studying their effects, and searching for methods to decrease, or possibly eliminate these errors in order to achieve better positioning accuracies in RTN GNSS. As stated above, one of the major problems is the signal attenuation which occurs when GNSS signals are attenuated by shades of trees or leaves. Another problem associated with RTN positioning is the multipath which tends to degrade the accuracy in the building areas. On the other hand, this study investigates the achievable accuracy and repeatability of the RTN under different satellite configurations by using VRS method. Accuracy of spatial data is reported according to the National Standard for Spatial Data Accuracy of United States (NSSDA).