Abstract
Precise Point Positioning (PPP) is becoming one of the most efficient and reliable methods in GNSS data processing. PPP performs precise position determination using a single receiver and precise satellite orbits and clock corrections from the International GNSS Service (IGS) and several other organizations. Three global online and free PPP services, provided by CSRS, APPS and GMV, are tested using observation data collected at the four permanent GNSS stations selected in different regions of Kyrgyzstan. A statistical analysis of the PPP results shows a maximum of 2.5 cm and 4.5 cm deviations in the planar surface for 24 hours and 4 hours GNSS observations respectively and about 10 cm geodetic height deviations under optimal GNSS satellite observation conditions. The use of PPP services can supplement engineering and land surveying depending the positioning purpose and accuracy, feasible observation periods and specific site conditions.
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