In this study, Precise Point Positioning (PPP) algorithms using GLONASS code pseudo-range measurements were developed and their performance was verified. The inter frequency bias, relativistic effect and satellite-antenna phase center offset models were applied as fundamental corrections for PPP. The GLONASS coordinate and time system were transformed to the same coordinate and time systems with GPS for accuracy comparison. GLONASS satellite orbits and clock offsets taken from Information-Analytical Centre were interpolated using the Lagrange method. The ionospheric delay was obtained by applying mapping function to the vertical TECU from Global Ionosphere Maps. The tropospheric delay was calculated from GIPSY to improve the accuracy of positioning. As a result of testing the developed PPP algorithms using GLONASS, the level of performance was comparable to that of PPP algorithms using GPS. Furthermore, additional studies of PPP algorithms using GLONASS should be utilized in a variety of surveying and Location-Based Service since it can make up for the weak point in GPS positioning system.

Keywords: GLONASS, code psuedo range, inter frequency bias, phase center offset