ESA UNCLASSIFIED - Releasable to the Public
GALILEO SYSTEM PERFORMANCE
MONITORING AND EXPERIMENTATION AT ESA
Gaetano Galluzzo
Galileo G1 System Engineering Unit
Directorate of Navigation
ESA-ESTEC
Webinar “All you need to know about the performance of Europe’s Global Navigation Satellite System”
3rd March 2021
Slide 2ESA UNCLASSIFIED - Releasable to the Public
Galileo System Performance monitoring
ESA, as Galileo system architect, is evaluating system performance in support of the development
and qualification of system releases, and supporting the diagnose and resolution of anomalies of the
system in operation
The Time and Geodetic Validation Facility (TGVF)
The Galileo System Evaluation Equipment (GALSEE) platform
R&D at ESTEC with Directorate of Technology, Engineering and Quality (D/TEC)
expertise.
As part of the Galileo System Engineering Technical Assistance (SETA), it is important
to mention the contribution provided by the performance team at Airbus Defence &
Space (Ottobrunn, Germany) through their in-house expertise and Performance
Assessment Facility.
Slide 3ESA UNCLASSIFIED - Releasable to the Public
Time & Geodetic Validation Facility (TGVF-X)
Galileo Exploitation Activities
Near-real time monitoring of the system.
Support to System Performance/Satellite
troubleshooting.
Orbit and Clock characterization during
Satellite In Orbit Testing.
Experimentation platform for state of
the art algorithms
Platform for new evolutionary elements
to be plugged into coming out of H2020,
NAVISP, and other R&D programme activities.
TGVF-X will allow new Galileo elements,
algorithms and services to be exercised in the
field with real data over extended
experimentation periods.
TGVF-X is de-coupled from the operational
Galileo system
Slide 4ESA UNCLASSIFIED - Releasable to the Public
TGVF-X architecture and interface with GRC
GRCGALILEO REFERENCE CENTRE
GRSPGeodetic Reference
Service Provider
TSP
Time Service Provider
GA
LILE
O
GCC
FUCGCC
OPFGround Mission Segment Interface
(SPF)
Galileo Sensor Station Network
Galileo Telemetry
DSFArchive
GALILEO SIS GALILEO S-Band
Ground Control Segment Interface
(SCCF / FDF)
ESA-ESTEC NAVIGATION LABORATORY
TSP to GF ICD
GRSP to GF ICD
TGVF-X CORE INFRASTRUCTURE
GESS Network
GALILEO SIS (including CS, OSNMA, HAS)
GA
LILE
OSU
PP
OR
T FA
CIL
ITIE
S
SER
VIC
E FA
CIL
ITIE
S
UMFUser Environment
Monitoring Facility
DPSTelemetry Retrieval
GALSEE
UTC(ESTC)
Test Mass Market Receivers
DMZ withA-GNSS provision
R&D Elements (H2020, NAVISP, TEC)
TimValTiming Validation
E-OSPF
OD&TS
Online & Offline
Data Analysis Tools(DQA,SBF,DPAF,SisMon, LTAF)
GSCGalileo Service Centre
Orbit Pred. & Almanacs to GSC
LEGEND:
DSF Data Server FacilitySBF Sensor Station Error Budget FacilityDQA Data Quality AnalyserDPAF Data processing and Analysis FacilityLTAF Long Term Performance Analysis FacilitySisMon SiS Monitoring Alert & Dashboard FacilityDPS Data Provisioning SystemGESS Galileo Experimental Sensor StationsTVF Time Validation FacilityE-OSPF Experimental Orbit and Synchronisation
Processing FacilityGALSEE Galileo System Engineering EnvironmenteANSP Experimental Air Navigation Service
ProviderSecure link to GCCTGVF-X element
Test User Receiver
eANSP with ARAIM ISM generation
EXTE
RN
AL
ENTI
TIES
Member State GNSS Monitoring
TGVF-X – GRC interface Sharing of TGVF-X products, such as GESS network data (raw &
RINEX) Sharing of TGVF-X reports (from daily to quarterly) and
experimentation activities Provision of ESTEC UTC timing lab calibration data and timing
expertise Access to TGVF-X near real time system monitoring
TGVF-X network includes one calibrated GESS (for GPS,
GAL, GLO and BDS) operated at the ESTEC UTC Lab.
Slide 5ESA UNCLASSIFIED - Releasable to the Public
MAIN FUNCTIONS
Main Data Collection and Storage Archive.
Near real-time Performance Monitoring/Service
Notification at ESA level
Telemetry Monitoring at ESA level for Space
Segment trend analysis and Radiation Monitoring
On board atomic clock performance
characterisation
System performance verification through Key
Performance Indicators
TGVF-X Core Infrastructure at ESTEC
Slide 6ESA UNCLASSIFIED - Releasable to the Public
TGVF-X operates the GESS (Galileo Experimental Sensor
Stations) network
17 sites located in all 7 continents
Representative of the Galileo Ground Segment
R&D expertise in house, collaborations with
ESTEC D/TEC Radionavigation Laboratory, and
ESTEC UTC Lab
Why TGVF-X for Prototyping?
ESTEC UTC LabGVES Troll, Antarctica GKIR Kiruna, Sweden
Slide 7ESA UNCLASSIFIED - Releasable to the Public
Own GESS Network composed by the 17 worldwide
distributed station, including 4 UTC labs.
HW upgraded in 2019 with a new Core Computer and
new GNSS Rx (PolaRx5/PolaRx5TR)
Upgrade performed to track more constellations and to
provide Real Time streams
SW upgrade continuosly on-going to support the new
Galileo services (last upgrade: processing OSNMA
signal)
The GESS raw data is stored in the TGVF archive and
available for use by other processing tools.
Data provided to external users, including GRC
TGVF-X GESS Station Upgrade
GESS Core Computer
GESS GNSS multi-frequencyantenna
GESS Receiver
Slide 8ESA UNCLASSIFIED - Releasable to the Public
TGVF-X Near Real Time monitoring - SisMonitoring
The TGVF-X provides the capability to monitor and report in near-real time the status of the
Galileo system
Signal Transmission
Detector
email server
GESS Hourlyand QuarterlyRAW files
Events detected
Events sent: Satellite OFF, Satellite ON, Age of Data Jumps, Sis Health Status, Data Validity Status, SISA status,
BGD zero, BGD jumps, …
SisMonitoringDashboard
System Status
Sendnotifications to users
Update status
information
GESS + IGS real time
RINEX
Slide 9ESA UNCLASSIFIED - Releasable to the Public
TGVF-X SisMonitoring Dashboard
tgvf.esa.int
This is just an excerpt / sample from full list of parameters monitored
Slide 10ESA UNCLASSIFIED - Releasable to the Public
Composite Clock experimentation with TGVF-X
Main objective: G1 OSPF Composite Clock prototype for experimentation, and tuning (under investigation)
Composite Clock integrated within the TGVF-X to be used as stable reference for satellite and station clocks
Test different set ups in order to obtain a robust clock
Simulate clock events (jumps, gaps, etc) and analyze behavior and stability of Composite Clocks
Composite Clock Function
(Kalman Filter)
EOSPF GSS/GESS Clock bias(/ODTSref)
EOSPF SV Clock bias (/ODTSref)
GSS/GESS clock bias (/CC)
SV clock bias (/CC)
Slide 11ESA UNCLASSIFIED - Releasable to the Public
TGVF-X Multipath Analysis Tool
Dedicated multipath analysis tool with different types of indicators Experimentation campaigns to characterize multipath within dedicated stations The main objective is to support the Ground Mission Segment in the monitoring of the multipath at Galileo
Sensor Stations.
Routine Monitoring Dedicated Campaigns
Slide 12ESA UNCLASSIFIED - Releasable to the Public
TGVF-X HASmon module is able to
monitor the Galileo HAS in terms of
data provision and positioning
accuracy.
A HAS adaptor provides HAS
corrections in RTCM format.
A set of KPIs are computed routinely.
TGVF-X support to HAS design, experimentation and monitoring (1/3)
HAS related KPIs
HA Service Provision
Stream Availability
Satellite Data Availability
LatencyOrbit & Clock
Accuracy
HA User Solution
Availability AccuracyConvergence
Time
HAS Adaptor
TGVF-X
Caster
HAS Key Performance Parameters
• Technical Monitoring
• User Solution
Galileo SIS
Real Time
PPP monitoring• GESS RT data
• PPP Corrections(e.g. IGS)
HAS Corrections
Slide 13ESA UNCLASSIFIED - Releasable to the Public
Routine check for availability and latency of different corrections
& observations.
An instance of a PPP per GESS station to perform analysis with
worldwide coverage.
TGVF-X support to HAS design, experimentation and monitoring (2/3)
Slide 14ESA UNCLASSIFIED - Releasable to the Public
Additional SW development performed to modify correction streams in order to understand of the impact on different
corrections accuracy and resolutions at user level.
New Software capable of introducing delays (both at observation and correction’s level), reduce resolution of
corrections, truncate corrections
Modified datastream fed into different PPP instances to compare accuracy
TGVF-X support to HAS design, experimentation and monitoring (3/3)
Very good example of TGVF-X usage as experimentation platform!
LSB=0.005
LSB=0.02
LSB=0.04
Clock Correction: LSB changed
LSB=0.0001 (unmodified, RTCM standard)
GPTB H
orizonta
l Err
or
[m]
Slide 15ESA UNCLASSIFIED - Releasable to the Public
TGVF-X support to use of Galileo in safety of life applications
SISE
ComputationTGVF Low Latency
Products (ORB & CLK)
Compute 𝑈𝑅𝐴𝐶Broadcast 𝑈𝑅𝐴𝐵
EOSPF
𝝈𝒎𝒐𝒏_𝒎𝒂𝒙Reference Products:
• TGVF
• Galileo HAS
GALILEO System
Predicted ORB & CLK
Historic URA (Bias + Sigma)
Online URA
Config Value
eANSP ISM
– Inverse solution with Kalman Filter
– Configurable value or URA as computed by EOSPF (Bias + Sigma)
Prototype User Ranging Accuracy (URA), an essential parameter in ARAIM user algorithm
Implementation of ARAIM user algorithm Supporting both Offline and Online ARAIM
Both RNP (H-ARAIM) and LPV-200 (V-ARAIM) services can be targeted
Evaluation of ARAIM performances at GESS and GSS locations
More info provided in the ION GNSS+ 2020 paperPrototyping of Galileo URA Determination with TGVF and Extended Galileo Performance Characterisation for SoL Applications
Slide 16ESA UNCLASSIFIED - Releasable to the Public
GALSEE
• GALSEE is the key system tool used by ESA for System Integration and Verifications activities, supporting the verification from
element level to major end-to-end system functions.
• A key differentiator between GALSEE and TGVF is the availability of a direct interface with the Galileo Mission Segment in GALSEE,
enabling in-depth troubleshooting of critical ground elements, such as the Orbitography and Synchronization Processing Facility (OSPF) and the
Message Generation Facility (MGF).
• GALSEE provides ESA with an inside view of the Ground Segment, allowing continuous monitoring and troubleshooting of critical GMS
elements (GSS, GSS-PTFs, OSPF, etc), through its accredited interface with GMS OPE. It is therefore an important asset for ESA to fulfil its
system design and qualification authority responsibilities.
• Support ESA in Anomaly Review Boards discussions with industrial contractors, generating evidences to raise and investigate Non-
Conformance Reports.
Slide 17ESA UNCLASSIFIED - Releasable to the Public
In-Field Galileo Performance Evaluation at ESA
Surveyed reference
ESTEC Radionav Lab Roof
staticpedestrian
vehicularR&D testing in challenging conditions (e.g. urban canyons)More info on D/TEC Commercial User Segment and Navigation System Validation
Slide 18ESA UNCLASSIFIED - Releasable to the Public
Acknowledgments
In addition to the teams from the ESA Directorate of Navigation (D/NAV) and Directorate of Technology,
Engineering and Quality (D/TEC), we would like to acknowledge the contributions of the industrial teams
involved in the support and development of the facilities mentioned in this presentation
• TGVF-X team led by GMV Spain, in particular the Operations Team at the ESTEC Galileo Processing
Centre
• Thales Alenia Space Italy and the Galileo System Engineering Technical Assistance (SETA)
subcontractors
• Galileo System Performance Team at Airbus Defence & Space in Ottobrunn, Germany
ESA UNCLASSIFIED - Releasable to the Public
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