Establishment of a Framework Partnership Agreement for the Galileo Reference Centre support from Member States (GSA/GRANT/04/2016)
For the integrated Galileo performance monitoring and analysis activity, the consortium makes a coordinated effort to measure the Signal in Space (SiS) of individual Galileo satellites at Radio Frequency (RF) level using a 25m radio-telescope operated by ASTRON and in parallel using a 25m radio-telescope operated by OSO, allowing for detailed interferometric analysis of the SiS, resulting in accurate localization of the phase center of the transmit antennae of the satellites. The measurements will be complemented with Satellite Laser Ranging (SLR) measurements by FGI. The results will be compared to and correlated with data collected by local GNSS sensor stations processed by NLR, including local ionospheric and tropospheric effects. There will be campaigns covering all Galileo satellites and all Galileo SiS transmit frequencies lasting 2 weeks and repeated every 6 months. During the campaigns, a GNSS-based local tie system will tie the interferometric observations to the local network and the same global reference frame where the Galileo satellite orbits are computed. Moreover, simultaneous connection between interferometric-based SiS and GNSS based satellite positions during the campaign can be made with a sub-cm accuracy.