Özet:

In evaluating the data provided by Global Navigation Satellite Systems (GNSS), scientific/academic, commercial software, and web-based applications, which are used increasingly, are implemented. The strategy of GNSS data processing is basically divided into two as absolute and relative. The web-based services increasing in use are mainly divided into either using the absolute method or the relative method. Precise Point Positioning (PPP) method makes possible to obtain cm level positioning by using a single receiver and offers possibility of a quite practical positioning for users. Real-time applications of the PPP method are also becoming more and more widespread, which offer both time and cost savings for users. While developments on positioning continue, GPS introduced to the life of human beings in every field besides its military purpose since its first appearance, has become quite common with the introduction of other systems (GLONASS, BeiDou, QZSS, IRNSS etc.). Today, as GNSS, it continues to exist more in our lives. The Multi-GNSS Experiment (MGEX) project has been developed by collecting data at International GNSS Service (IGS) stations spread worldwide, received signals from the satellite systems developed by several countries and by including them to the processing stage and then data collection at the specified stations from all of the satellite systems has been started. In this study, the GNSS observation data collected at 5 MGEX stations scattered around the world for a duration of 10-day were evaluated with a web-based service, namely CSRS-PPP. In the concept of MGEX Project, it is possible to collect data from the stations with an observation duration ranging from 1 to 30 seconds and from multiple satellite systems (GPS, GLONASS, Galileo, QZSS, NAVIC, BeiDou, SBAS). In the evaluation stage of CSRS-PPP application, the evaluation performance was examined and concluded in terms of satellite systems used as GPS and GNSS (GPS, GLONASS, and GPS+GLONASS), data record interval ranging as 1 and 30 seconds, and observation duration from 15 minutes to 24 hours.

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