Summary:

Lately we can see a very fast development of the satellite systems created mainly in order to raise the precision, compatibility and interoperation of satellite positioning. Besides functioning American GPS and Russian GLONASS other systems become, like for example Japanese: QZSS (Quazi- Zenith Satellite System), MSAS (Multifunction Augmentation Transport Satellites), Indian: IRNSS (Indian Radionavigation Satellite System), GAGAN (GPS and GEO Augmentation System), Chinese COMPAS, SNAS (Satellite Navigation Augmentation System) or Nigerian NIGCOMSAT (Nigerian Communications Satellite SBAS). The paper shows the results of measuring campaign carried out in Krakow (Poland) on a reference point with the aim to determine reliable accuracy of differential correction in one of SBAS systems - Satellite Based Augmentation System
[Narkiewicz, 2003]. Testing control measurements were carried out using simple real-time DGPS procedure in the form of differential corrections from EGNOS system. Carried out detailed analysis of the results let us come to the conclusion, that GMS-2 receiver with EGNOS correction increases the real accuracy of positioning
along the X axis to 2.6m, along the Y axis to 2.1m and the height H to 3.1m. It could then be used to collect data for GIS with possibility of coordinates registration in different reference systems plus making photo documents.