Consulting and Technology Technical Excellence. Pragmatic Solutions. Proven Delivery Dr. Frank...
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Consulting and Technology Technical Excellence . Pragmatic Solutions . Proven Delivery Dr. Frank Zimmermann November 2006 The Galileo System - Predicting Performance and Producing Simulated Data for Experimental Purposes
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Transcript of Consulting and Technology Technical Excellence. Pragmatic Solutions. Proven Delivery Dr. Frank...
Consulting and TechnologyTechnical Excellence . Pragmatic Solutions . Proven Delivery
Dr. Frank Zimmermann
November 2006
The Galileo System - Predicting Performance and Producing Simulated Data for Experimental Purposes
www.vega-group.com
Overview
Technical Excellence . Pragmatic Solutions . Proven Delivery
Introduction
Galileo Simulation Capabilities (GSSF)
Validation of GSSF
Example Results
Support to Application Development
Summary
www.vega-group.com
Overview on Galileo Activities at VEGA
Galileo System Simulation Facility (GSSF)
Galileo Ground Mission Segment Assembly, Integration & Verification Platform (Galileo GMS AIVP)
Galileo Constellation Simulator (CSIM) Galileo Operations (GSTB V1 & V2, GaIn Operations Manager)
Galileo Test and Development Environment (GATE) Co-operative Networks for Intelligent Road Safety (COOPERS) Shareholder of Galileo Centre in Darmstadt (CESAH) A
pp
licat
ion
Op
erat
ion
s V
erif
icat
ion
Def
init
ion
(initi
al)
prim
e ob
ject
ive
www.vega-group.com
The Galileo System Simulation Facility (GSSF)
Galileo
Independent, global, European satellitenavigation system
For civilian applications & interoperablewith GPS
GSSF
Simulation environment that reproducesthe functional and performance behaviourof the Galileo system
Offers the necessary flexibility and functional scope to support Galileo system simulation needs during the entire program life cycle.
Developed on behalf of ESA/ESTEC by an international consortium led by VEGA
Validation has received prime attention (also independently by ESOC).
Visualisation supported by IDL (CREASO)
www.vega-group.com
GSSF – Simulation Capabilities
GSSF provides a single simulator that uses alternative models depending upon the type of analysis the end-user wishes to perform (more flexibility than traditional simulators):
Service Volume Performance Analyses (navigation and integrity performance over longer time periods and over large geographical areas).
Raw Data Generation (Galileo and GPS raw data for experimental purposes: RINEX observation, IGS SP3)
Simulation of the nominal system and its various degraded modes (failures of elements)
www.vega-group.com
GSSF – Model Components
Space Segmentsatellite models
Environmentmain perturbationson satellite signal
User Segmentuser receivers andinternal algorithms
Ground Segmentrequired GS models(GSS & ULS)
www.vega-group.com
GSSF Validation
GSSF has been rigorously validated.
SVS Validation: Against simulated data from trusted sources
RDG Validation against real data: RINEX files from Kourou were extracted from the GSTB-V1 test data set together
with IGS ephemeris and clock files.
Code, carrier and Doppler measurements as simulated by GSSF RDG were compared with those obtained from the real Kourou data (stepwise approach).
ESA/ESOC have carried out an independent validation of GSSF Successful IGS Processing and 64 mm RMS orbit fit over 24 hrs The GSSF Raw Data is a valid representation of real measurement data.
www.vega-group.com
GIOVE-A
Successful GSSF validation with GPS measurements
GIOVE-A measurements provided by ESA will now be used to further calibrate GSSF RDG
This will not affect the environment but satellite-specific models(e.g. acceleration due to solar radiation).
GIOVE-A
GPS
GEO (EGNOS)
www.vega-group.com
Signal in Space Monitoring Accuracy (1)
Nominal SISMAfor Galileo on aGSS network
Representslevel of accuracyin monitoringsatellite positions
www.vega-group.com
Signal in Space Monitoring Accuracy (2)
Nominal SISMAfor Galileo on aGSS network
Subject to twostation failuresover North America
SISMA degradesaccordingly
www.vega-group.com
Ground Station Visibility (1)
Visible GroundStations for a35 Station Network
www.vega-group.com
Ground Station Visibility (2)
Visible GroundStations for aNetwork subject to2 failures
Reduced tominimum of 5 overNorth America
www.vega-group.com
Space Based Augmentation Systems (1)
GSSF supports the analysis of stand-alone GPS/SBAS systems as well as GPS/SBAS combined with Galileo
Example: Compare visibility and navigation system precision with and without SBAS support:
EGNOS:
INMARSAT 3 F2 (AOR-E)ESA ARTEMISINMARSAT IOR-W (III-F5)
QZSS & WAAS
UERE budgets drive NSPcalculation.
0
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0 10 20 30 40 50 60 70 80 90 100
Elevation Angle [°]
To
tal
UE
RE
in
clu
din
g 1
0% M
arg
in
(1-s
igm
a er
ror)
[m
]
Galileo L1
GPS L1
SBAS L1
www.vega-group.com
The Japanese Quasi-Zenith Satellite System
QZSS is to cover both Japan and Australia,
To maintain continuous visibility at high elevations (urban canyons)
Three satellites moving in different orbits but following the same relative track.
Satellite Anomaly [°]
Ascension [°]
Eccentricity [-]
Inclination [°]
Perigee [°]
Semi-major axis [km]
QZSS 1 0 85 0.099 45 270 42164 QZSS 2 240 205 0.099 45 270 42164 QZSS 3 120 325 0.099 45 270 42164
www.nict.go.jp
www.jaxa.jp
0
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0 20000 40000 60000 80000 100000
Time [s]
Ele
vati
on
[°]
QZSS1
QZSS2
QZSS3
www.vega-group.com
Space Based Augmentation Systems (2)
www.vega-group.com
Space Based Augmentation Systems (3)
www.vega-group.com
Space Based Augmentation Systems (4)
www.vega-group.com
Space Based Augmentation Systems (5)
www.vega-group.com
Space Based Augmentation Systems (6)
www.vega-group.com
Instantaneous Regional Integrity Risk
www.vega-group.com
Instantaneous Availability of Integrity
www.vega-group.com
External Regional Integrity Service (ERIS)
GSS Sites (Network of Stations) Station List:
Site# Location Longitude [deg] Latitude [deg]
1 SEOUL 127.00 37.70
2 PUSAN 128.93 35.18
3 CHEJU 126.50 33.50
www.vega-group.com
Safety-of-Life User (Aircraft en-route)
www.vega-group.com
GSSF Raw Data Generation Example
Effect of a clock jump, imposed as a Feared Event during the simulation on a Galileo Satellite observed at a Galileo Sensor station (Kourou).
The clock jump is defined by an additional bias of -0.0003 s applied at30 min after the simulation start time.
Jump of 90 km
Due to environmental delayson the signal and clock offsets
www.vega-group.com
COOPERS (Co-operative Networks for Intelligent Road Safety)
Integrated EU-Project with the following objectives:
Establish methodology for the integration of traffic control, traffic management and traffic information systems
Develop cost-efficient and advanced roadside and vehicle-side sensors and positioning-based situation-dependable driver assistance system (OBU)
Evaluate whether such methods will meet the overall target to improve safety
Assess what additional value can be achieved by Galileo for robust positioning, applying measurement campaigns and calibrated simulation using GSSF
Kick-off in February 2006 (40 partners, initially for 18 months with a possible extension towards 4 years, co-funded by the EU)
www.vega-group.com
GSSF supports the simulationof mobile users:
Ground-based vehicles
Aircraft in flight
Satellites in LowEarth Orbit (LEO)
Errors such as clockfailures can be simulatedalong the trajectories.
Simulation of Mobile Users
www.vega-group.com
Experiment (pwpSystems)
• OBU Prototype Development• Sensory &• Positioning Algorithms• Measurement Campaigns
Optimise combination of sensory and algorithms Evaluate potential for performance improvement applying Galileo
Simulation (VEGA)
• Extensions to GSSF• Interface to or Integration of OBU Model• Validation & Calibration for Reference Measurements (GPS)• Simulation with Galileo
GPS-Performance (ESOC)
• Provision of up-to-date GPS Performance Data • Support to OBU Modelling (Algorithms)• Support for Validation & Calibration of Simulation
Cooperation for Robust Positioning
www.vega-group.com
Summary & Main Strengths of GSSF Rigorously validated against real data or trust-worthy simulated data
Specifically tailored towards the needs of the Galileo community
Is being maintained by VEGA on behalf of ESA
Can be further upgraded to match evolving requirements
Updates to SVS capability successfully completed recently(Inclusion of Galileo Integrity Concept)
Galileo performance assessment is currently ongoing on behalf ofESA and in preparation of Galileo CDR in June 2007.
RDG calibration with GIOVE-A data is ongoing.
Approx. 300 licenses have been granted up to now by ESA worldwide
www.vega-group.com
www.gssf.info
www.vega-group.com
Consulting and TechnologyTechnical Excellence . Pragmatic Solutions . Proven Delivery
