Comparison of Clock Solution of GLONASS Time Transfer using ESOC Clock products

Abstract

AV). With the completion of the GLONASS constellation, GLONASS measurements could have been used in the dual-frequency AV mode. R2CGGTTS software is commonly used in GNSS (Global Navigation Satellite System) Time Transfer to provide the standard time transfer format, CGGTTS (Common GPS GLONASS Time Transfer), using observation files and navigation files written in RINEX format. Hence, the combination of GPS and GLONASS provides a clock solution based on AV mode using one time transfer solution. To provide the clock solution combined GPS and GLONASS measurements, the ISB (Inter System Bias) should be removed. One IGS analysis center, ESOC, provides satellite clocks for GPS as well as GLONASS satellites with the same reference for both constellations. Thanks to the ESOC clock products, to compute an AV solution combining the CGGTTS for both constellations is now possible.In this paper, we present the results of the first step of the combination of GPS and GLONASS clock measurements, which is the clock correction of GLONASS code measurements using ESOC clock products.