Inside GNSS Media & Research

NOV-DEC 2018

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Page 38 of 59 N O V E M B E R / D E C E M B E R 2 0 1 8 InsideGNSS 39 the building hosting the equipment (see Figure 8). The communication between sen- tinel segment and CMF is achieved via Ethernet; properly configured hardware firewalls allow for safeguarding the integrity of this connection. Additional External Resources As mentioned earlier, the BLUEGNSS monitoring service is enriched by the data coming from external, already existing GNSS networks and services. A brief overview is reported in the follow- ing list. Please see Additional Resources for more information. • EDAS provides GNSS performance metrics measured by the EGNOS RIMS. RIMS stations are distribut- ed around the world, but it is worth noting that the European region has the highest density of such stations and, more important ly, some of them are placed within or very close to the BLUE-MED area (e.g., ROM- Ciampino, ATH-Athens, etc.). us, the inclusion of such stations has the advantage of increasing the number of monitoring points in the Medi- terranean area, without additional installations. • IGS-MGEX is a dense network of monitoring stations that offer the following services: - An archive of precise GNSS orbit- al parameters that can be used by the CMF for the computation of some global metrics (such as GPS URE and Galileo SISE). - Each station prov ides sets of RINEX data, which can be used to produce analysis of local GNSS performance. • EUREF is a permanent GNSS net- work consisting of: - continuously operating GNSS reference stations - data centers providing access to the station data - analysis centers that routinely analyze the GNSS data - product centers or coordinators that generate the EPN products - a Central Bureau that is respon- sible for the daily monitoring and management of the EPN. This network has been included within the BLUEGNSS network to have access to RINEX data provided by those monitoring stations which are within or close to the BLUE-MED FAB. • T he Nav C e n (Nav igat ion C en- ter) server provides access to GPS NANUs, a lmanacs, and current operational advisories. Specifically, NANUs are used to assess the GPS continuity in compliance with ICAO Doc-9848 and RT/2016/028 (see Additional Resources). • The EGSC (European GNSS Ser- vice Center) server provides access to Galileo NAGUs and almanacs. Specif ically, NAGUs are used to assess t he Ga lileo continuit y in compliance with ICAO Doc-9848 and RT/2016/028 (see Additional Resources). Central Monitoring Facility (CMF) Simply speaking, the CMF operates as a central server whose role is collecting, recording, and processing data com- ing from each node of the BLUEGNSS network in order to produce key perfor- mance indicators (KPIs) for: • a global GNSS performance assess- ment within the BLUE-MED area • a local GNSS performance assessment of each site hosting a GNOME senti- nel. A pictorial representation of this unit is reported in Figure 9. This schematic highlights the main functional blocks of data gathering, processing, and stor- ing assigned to the CMF. All computed KPIs are summarized within periodic reports (daily and monthly) that are uploaded within the BLUE-MED portal where they are available for consulting by authorized personnel. e CMF unit is installed at the air- port of Ciampino, within the ENAV/ ACC (Area Control Center) facility. Key Performance Indicators and Periodic Reports All data collected by the CMF unit are used to produce daily and monthly FIGURE 8 Pictures of GNSS antenna installations (a) GNSS antenna installed on the roof ARO/MET building of Linate airport (Italy) (b) GNSS antenna installed on the roof of Kos airport tower (Greece) (c) GNSS antenna installed on the roof of Luqa airport tower (Malta) (d) GNSS antenna installed on the roof of a shelter within Larnaca airport (Cyprus)

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