On Using UTC/UTCr for GNSS-GNSS Time Offset Monitoring

GPS, GLONASS, Galileo, BeiDou and other Global Navigation Satellite Systems provide high-accuracy positioning and timing to overland, marine, airborne and other kinds of users. For GNSS interoperability it is necessary to provide users with the values of the offsets between GNSS time scales. Thus, GNSS-GNSS Time offset monitoring is an essential issue. The paper analyzes the available methods of GNSS-GNSS Time offset independent monitoring “from outside” and the feasibility of using the data provided by Bureau International des Poids et Mesures BIPM on UTC/UTCr time scales for calculating GNSS-GNSS Time offsets. The results of GNSS-GNSS Time offset monitoring at Russian Institute of Radionavigation and Time are presented.