As a result of developments in satellite geodesy and data processing and analysis, the PPP technique has been developed that enables centimeter-accurate positioning with a single GNSS receiver, without the need to use data collected from any reference station. In this method, the data collected with a single receiver is processed together with the precise satellite orbit and clock information produced by different organizations, and the position can be determined as static or kinematic with high accuracy. Although there are many approaches for determining the coordinates with the PPP technique, recently webbased online data processing services have been successfully used all over the world. On the other hand, satellite-based positioning studies that started with GPS, with the addition of GLONASS, Galileo and BeiDou satellites in the following time, led to the formation of an integrated positioning system called GNSS. Within this study, points with different satellite observation characteristics were established in ITU Ayazağa Campus and the effect of multi-GNSS on static PPP accuracy was examined. The results obtained from the study show that the accuracies obtained with the PPP technique vary significantly depending on the physical conditions at the point where the measurement is made, the number of satellites and the geometry of the satellites. Additionally, the measurements made with more than a single satellite system showed a significant improvement role in the results of the measurements made especially in restricted conditions with respect to satellite visibility.