Precise GLONASS orbit determination within the IGS/IGLOS – Pilot Project

Abstract This paper reviews the reasons for setting up the IGS GLONASS Pilot Project and the objectives of this initiative. Then we present the operational tracking network as well as the current state of the GLONASS constellation. Afterwards, we discuss in more detail the generation and consistency of current GLONASS precise orbits based on microwave and on laser tracking data. Later on the procedure for generating the more robust combined precise GLONASS orbits is explained, accompanied by information how all the IGLOS products can be accessed. Taking into consideration the upcoming GALILEO system, IGLOS can pave the way for handling data from a multi-system GNSS.