report of the action team on global navigation satellite systems (gnss)

e less than 30 m (95%). In that time period <strong>the</strong> modernisation <strong>of</strong> ground control segment isplanned assuming <strong>the</strong> deployment <strong>of</strong> one–way receiving station network for orbit determinationand clock correction determination. The integrity monitoring system based on <strong>the</strong> spread one-wayreceiving station network shall be implemented as well.105. From 2007 to 2008, <strong>the</strong> new generation satellites GLONASS-K with extendedperformances will be launched transmitting <strong>the</strong> third civil signal at L3 frequency band (1190.5 –1212 MHz). The search and rescue service is expected to be implemented on board <strong>of</strong>GLONASS-K. Positioning accuracy will be available <strong>of</strong> <strong>the</strong> order <strong>of</strong> 5-7 m (95%). Modernisation<strong>of</strong> ground segment assumes <strong>the</strong> global integrity monitoring system deployment and globaldifferential system implementation to provide for users <strong>the</strong> integrity information and higher realtimeaccuracy <strong>of</strong> positioning.106. Study <strong>of</strong> requirements for <strong>the</strong> next GLONASS generation (code name is GLONASS-KM) has been initiated in 2002.107. Generally, <strong>the</strong> full (24 satellites) GLONASS constellation transmitting two civil signalsshould be available from 2010. Three civil signals from <strong>the</strong> full GLONASS constellation areplanned to be available after 2012.GLONASS application108. Being a part <strong>of</strong> <strong>the</strong> GNSS system, GLONASS in combination with GPS can benefit usersby providing more reliable navigation with better availability <strong>of</strong> navigation service, particularly inurban and canyon conditions. Due to higher orbit inclination than GPS, <strong>the</strong> GLONASS service isbetter presented in <strong>the</strong> polar regions <strong>of</strong> <strong>the</strong> Earth. The frequency division <strong>of</strong> <strong>the</strong> GLONASSnavigation channels provides users with <strong>the</strong> robust navigation in <strong>the</strong> conditions <strong>of</strong> interferenceand greater anti-jam capability.GLONASS augmentation109. The Federal Space Agency, in <strong>the</strong> framework <strong>of</strong> <strong>the</strong> Federal GLONASS MissionOriented Program, has launched <strong>the</strong> project for <strong>the</strong> GLONASS augmentation systemdevelopment. The main objectives <strong>of</strong> <strong>the</strong> system are:• GNSS integrity monitoring service for civil users; and• Real-time sub-meter positioning accuracy.110. The system architecture consists <strong>of</strong> <strong>the</strong> following components:• Monitoring station network on <strong>the</strong> Russian territory receiving <strong>the</strong> GNSS signals, mainlyplaced with <strong>the</strong> existing geodesy sites including IGS and SLR stations;• Data acquisition system based on <strong>the</strong> existing telecommunication network withmodification to ensure <strong>the</strong> necessary level <strong>of</strong> <strong>the</strong> data protection, data delivery delay andreliability;• Two hot redundant data processing centres dedicated for data pre-processing, preciseorbit and time correction determination in real time mode, integrity informationgeneration;• An analysis centre for a deep, posterior analysis <strong>of</strong> GNSS ephemeris, time and integritydata; and24