Inside GNSS Media & Research

NOV-DEC 2018

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Page 36 of 59 N O V E M B E R / D E C E M B E R 2 0 1 8 InsideGNSS 37 In the framework of the BLUEGNSS project, the GNSS monitoring concept is a leading aspect that paved the way to the deployment of an innovative, multi- source monitoring network able to: • assess and record GNSS perfor- mance, measurements, and data, • analyze and report any detected RF interference (RFI) within the GNSS spectrum. It is worth noting that ESSP is the EGNOS Service Provider for the period 2014-2021. erefore, it is in charge of operations for the ground and space segments, overall infrastructure main- tenance, and compliance with safety standards. Conversely, BLUEGNSS plays a different role: its network is mainly focused on the analysis of GNSS per- formance and its compliance to ICAO standards. erefore, it is provided with additional monitoring elements in the BLUE-MED area that allow for accom- plishing this goal. More details on network architecture are provided in the next sections. BLUEGNSS Monitoring Network: General Overview The BLUEGNSS monitoring network provides a common ser vice of GPS, GPS/EGNOS, and Galileo performance assessment within the BLUE-MED area. A schematic picture of network topology is reported in Figure 3. It shows a TCP/IP star-network that connects some dedi- cated monitoring stations (developed by IDS and referred to as GNSS Opera- tive Monitoring Equipment (GNOME) sentinels) to a common collector indi- cated with the acronym CMF (Central Monitoring Facility). This unit is also fed by data coming from other exter- nal, already existing GNSS networks and services, i.e., EDAS, IGS/MGEX, EUREF, NavCen, and EGSC. is architectural choice is justified by the need to develop a flexible, scal- able, and easily configurable network able to integrate and process data com- ing from several monitoring stations, even if t hey belong to independent networks. In this way, it is possible to increase the number of monitoring points wit hin t he BLUE-MED FAB without new installations, thus reduc- ing costs and improving the service performance. C M F outc ome s a nd s t a t i s t i c s a r e s u m m a - rized in ad-hoc daily and monthly reports that are automatica l ly produced a nd uploaded w it h i n a restricted internal area of t he BLU E -M E D por t a l (see Additional Resources and Figures 4 and 5). us, only authorized personnel, provided with a login and password, can download them. A geographic represen- tation of the BLUE-MED flight region (bounded by a FIGURE 3 BLUEGNSS network topology FIGURE 4 Two screenshots taken from the internal area of BLUEMED portal (a) List of monthly reports (b) List of daily reports FIGURE 5 Monthly Report front page [left] and some content examples (Range accuracy and VPL plot) [right]

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