Comparative Analysis of GNSS Satellite Precise Orbit and Clock Products of Analysis Centers

Orbit and clock products of satellites are used to solve the problem of navigation positioning in absolute mode. Broadcast orbit and clock products have a high error (1 m) and therefore cannot be used in high-precision positioning. Highprecision ($\mathbf{1 ~ c m}$) orbit and clock products, which include orbital parameters and clock offsets from system time, are published by various analysis centers. To validate these products, it is necessary to compare orbit and clock products of leading analysis centers. Orbit and clock products calculated at The Federal State Unitary Enterprise «Russian metrological institute of technical physics and radioengineering» were also added to the study. Analysis centers have developed their own special mathematical software to estimate orbit and clock offset of satellite. A comparative analysis of analysis centers’ orbit and clock products was conducted during the period from January 1 to January 14,2023. To assess the quality of orbit and clock products, Signal-In-Space User Range Error was used. Additionally, the influence of high-precision orbit and clock products on the results of a navigation positioning in absolute mode was studied.