Accuracy of Precise Point Positioning with GPS and GLONASS Satellites Constellation Using Online Web Services

Precise Point Positioning is a method used to determine the absolute position of a GNSS receiver, which can be particularly useful in areas lacking in RTN infrastructure. Research conducted so far on the use of the PPP has been focused on the processing of at least one-hour observation sessions. This paper presents the results of a comparative analysis concerning the accuracy of position based on observations lasting between 0.5 to 6 hours with the use of PPP services. Calculations were performed using GPS and GLONASS constellations and Final products. The paper discusses the accuracy of simultaneous positioning of three points in the test network and its influence on the change in horizontal distances and height differences between triangle vertices. The study indicates that application of another satellite constellation effectively shortens the required measurement session while maintaining the same degree of accuracy as in observations performed with a single GPS constellation.