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Folie 1, GTFS 2005 > JF
Time Facility for German Galileo Test Environment GATEJ. Furthner, German Aerospace Center (DLR)
Folie 2 > Vortrag > AutorDokumentname > 23.11.2004
J. Furthner, Institute of Communications and Navigation, DLRGTFS 2005, 05.12.2005, Herrsching, Germany <2>
Content
Overview of GATEMajor Objectives of GATEGATE Field and Service AreaFunctions and Elements of GATE Control SegmentFunctional Architecture of GATE Time FacilityRequirements for GATE Time FacilityPhysical Architecture of GATE Time FacilityControlling of GATE Time FacilityMan Machine Interface and Location of GATE Time Facility
Folie 3 > Vortrag > AutorDokumentname > 23.11.2004
J. Furthner, Institute of Communications and Navigation, DLRGTFS 2005, 05.12.2005, Herrsching, Germany <3>
Overview of German Galileo Test Environment GATE
What is GATE?Ranging system using Galileo signalsBased an stationary terrestrial signal transmittersOpen to any user
Where is the GATE service area?Near to Munich (Berchtesgaden)
Who is the customer?German Aerospace Center DLR
Status of GATE?Starting for operation in 3rd quarter 2006
Who develops GATE?A consortium of 9 companies/universities IfEN GmbH (Poing) being the prime contractor
Folie 4 > Vortrag > AutorDokumentname > 23.11.2004
J. Furthner, Institute of Communications and Navigation, DLRGTFS 2005, 05.12.2005, Herrsching, Germany <4>
GATE – Consortium
Folie 5 > Vortrag > AutorDokumentname > 23.11.2004
J. Furthner, Institute of Communications and Navigation, DLRGTFS 2005, 05.12.2005, Herrsching, Germany <5>
Major Objectives of GATE
Signal ExperimentGain experience in building a Galileo ranging systemGain experience with new Galileo signal structure: flexible (BOC(1,1); extendible (GPS-L2C, L5); adaptable (Interference, Jamming)
Receiver TestingTest facility for Galileo receiversTesting of new BOC receiver algorithms
with realistic signal behaviour and strength, atmospheric effectsUser Application
Provide an environment for test of user applicationsEspecially for hybrid GPS/Galileo applicationsExtendible for local applications (CAT I-III) beyond FOC
Folie 6 > Vortrag > AutorDokumentname > 23.11.2004
J. Furthner, Institute of Communications and Navigation, DLRGTFS 2005, 05.12.2005, Herrsching, Germany <6>
GATE – Limitations & Capabilities
GATE vs. „the Real Thing“Constraints in geometry (DOP / Visibility)
Careful choice of service areaConstraints in local signal propagation effects
Multipath: GTS-GMS geometry corresponds to SV-GMS worst case, but multipath due to user motion dominating effect!
Geometry induced effects can be emulatedIonosphereTroposhere
GATE vs. Laboratory / SimulatorEnd to end test of receiver, including antennaReal time dynamics, instead of predefined trajectoriesUser selectable hosting vehicle applicable for application
Folie 7 > Vortrag > AutorDokumentname > 23.11.2004
J. Furthner, Institute of Communications and Navigation, DLRGTFS 2005, 05.12.2005, Herrsching, Germany <7>
GATE Field Segment in Berchtesgaden
Location of Transmitter Stations:GrünsteinToter MannStörhausKneifelspitzeKehlsteinhausJenner
Location of Monitor Stations:Sulzberg
Folie 8 > Vortrag > AutorDokumentname > 23.11.2004
J. Furthner, Institute of Communications and Navigation, DLRGTFS 2005, 05.12.2005, Herrsching, Germany <8>
GATE Service Area in Berchtesgaden
Size: > 25 km²Performance Criteria:
Min. 4 visible GTSHDOP < 2VDOP 6-20
Infrastructure Criteria:Availability of GMS platformsMountain area for GMS elevation
Typical User Environment Available:
StreetsRailways
Visibility
Folie 9 > Vortrag > AutorDokumentname > 23.11.2004
J. Furthner, Institute of Communications and Navigation, DLRGTFS 2005, 05.12.2005, Herrsching, Germany <9>
Functions of the GATE Control Segment
Hosting and providing the GATE system timeMonitoring and controlling of the entire GATE systemArchiving off all necessary data (housekeeping as well as user relevant data)Hosting and operating a control centre which serves as operational node of GATE including e.g. mission planningProvide an appropriate interface to the GATE user community
The main elements of the GCS are the GATE Time Facility (GTF)GATE Monitoring & Control Facility (GMCF)GATE Archiving and Data Server (GADS)GATE Data Transfer Network (GDTN)GATE Mission Support Facility for Standard user (GMSF-S)
Folie 10 > Vortrag > AutorDokumentname > 23.11.2004
J. Furthner, Institute of Communications and Navigation, DLRGTFS 2005, 05.12.2005, Herrsching, Germany <10>
The Elements of the GATE Control Segment GCS
ControlSegment
Mission Segment
GPF
GTS
GPSsatellites
Galileo IOV satellitesGPS /
Galileo
GUT
GMS TransmitSegment
GNSSsensor
GTF GCC
GMCF
GADS
Operators
UTC(DLR) Lab
Monitoring system
Expertteam
Master clockwith hot-spare
NTPserver
GMSF-S
Folie 11 > Vortrag > AutorDokumentname > 23.11.2004
J. Furthner, Institute of Communications and Navigation, DLRGTFS 2005, 05.12.2005, Herrsching, Germany <11>
The Elements of the GATE Control Segment GCS
ControlSegment
Mission Segment
TransmitSegment
UserSegment
GTF GCC
GMCF
GADS
Operators
UTC Lab
Monitoring system
Expertteam
GPF
GTS
GPSsatellites
Galileo IOV satellites
Master clockwith hot-spare
GUT
NTPserver
GMS
GMSF-S
GNSSsensor
GURx
GPS / Galileo
Folie 12 > Vortrag > AutorDokumentname > 23.11.2004
J. Furthner, Institute of Communications and Navigation, DLRGTFS 2005, 05.12.2005, Herrsching, Germany <12>
The Elements of the GATE Control Segment GCSGATE Control Segment
GMCF
GATE Monitoring & Control Facility
GADS
GATE Archiving & Data Server
GTF
GATE Time
Facility
GMSF-S
GATE Mission Support Facility
Standard
Located at DLR GSOC Control Centre
Located at DLR TL
Folie 13 > Vortrag > AutorDokumentname > 23.11.2004
J. Furthner, Institute of Communications and Navigation, DLRGTFS 2005, 05.12.2005, Herrsching, Germany <13>
Functional Architecture of GATE Time Facility GTF
The functions of GTF aregeneration of reference time scale of GATE: GATE System Time GASTprovision of access to GAST for other GATE elementsprovision of access to UTCprovision of access to GPS Time
GTF takes the time keeping function similar to the Precise Time Facility in Galileo.Decreasing the project costs, the GTF is hosted by the DLR Time Laboratory (DLR-TL) The GTF has access to clocks and products (time scales) which are provided by the DLR-TL
Folie 14 > Vortrag > AutorDokumentname > 23.11.2004
J. Furthner, Institute of Communications and Navigation, DLRGTFS 2005, 05.12.2005, Herrsching, Germany <14>
GTF – Functional Architecture
The receivers are configured to send the following messages to the GPF:GPS observationsGPS navigation messages
referenced to GASTAdditional Parameters through an internal OS service to GPF
GAST-UTC offset and rate UTC-TAI offsetGATE MC-UTC(DLR) offset and rate
Copies of all to GPF transmitted data to GMCFReceiving and transmitting configuration data for the GTF from and to GMCFSynchronisation of all GATE elements via NTP protocol
Folie 15 > Vortrag > AutorDokumentname > 23.11.2004
J. Furthner, Institute of Communications and Navigation, DLRGTFS 2005, 05.12.2005, Herrsching, Germany <15>
GTF – Functional Architecture
DLR Time Lab
Steeringto UTC
Responsibility of DLR Time Lab
Generation ofUTC(DLR)
Interfaceto BIPM
Responsibility of GTF
Elementcontrol &
interfacing
Networksynchronzation
Interface toGPS Time andGAST provision
GPF/GMCF
NTP synch
M&C data/GPS obs
M&Cdata
GAST
BIPM
UTC(DLR) correction
GAST correction
UTC(DLR)
GAST
UTC-UTC(DLR)
GPS SIS
Generation ofGAST
GAST-UTCcomparison
GATE-specificoperations
UTC correction
Folie 16 > Vortrag > AutorDokumentname > 23.11.2004
J. Furthner, Institute of Communications and Navigation, DLRGTFS 2005, 05.12.2005, Herrsching, Germany <16>
GTF – Requirements
GAST shall be produced at the GTF from a high-performance clock being the GATE master clock.The GTF shall have access to UTC.The offset between GAST and UTC < 100 ns modulo 1s over any 1-year time interval within a 95% confidence level.The offset between TAI and GAST < 50 ns (96%), assuming the estimation of TAI six weeks in advance.The frequency instability of GAST expressed in terms of Allan-Deviation relative to TAI shall be better than 1e-13 over 10 000 s.The frequency instability of GAST expressed in terms of Allan Deviation relative to TAI shall be better than 2e-14 over 1 month.The life time of the GATE master clock shall be at least 3 years. The MTBF of the GATE master clock shall be no more than 1 failure per 12 500 hours.The availability of the GTF has to be at least 98.1 percent in order to meet the overall GCS availability requirement.
Folie 17 > Vortrag > AutorDokumentname > 23.11.2004
J. Furthner, Institute of Communications and Navigation, DLRGTFS 2005, 05.12.2005, Herrsching, Germany <17>
GTF – Physical Architecture
Detailed Availability of GTF and its elements without redundancy
Availability of GTF reaches not the requirement (98.1% ) without redundancy
Folie 18 > Vortrag > AutorDokumentname > 23.11.2004
J. Furthner, Institute of Communications and Navigation, DLRGTFS 2005, 05.12.2005, Herrsching, Germany <18>
GTF – Physical Architecture
Total GAST availability without redundancy
Total GAST availabilitywith redundancy
Folie 19 > Vortrag > AutorDokumentname > 23.11.2004
J. Furthner, Institute of Communications and Navigation, DLRGTFS 2005, 05.12.2005, Herrsching, Germany <19>
GTF – Physical Architecture
High availability of GTF needs a redundancy of single GTF elements The physical architecture of the GTF is based on COTS hardware. It consists of
2 Dell Windows Server 2003 (XEON 3 GHz, 1 GB RAM, RAID1 36 GB SCSI, 10/100/1000 Mbit Ethernet)2 GPS time receiver Septentrio PolaRx2.Meinberg NTP/LAN Server with GPS and 1PPS signal input
GTF will have access to DLR campus LAN to enable data exchange with other GATE elements.The CPU clocks of the servers will be synchronized to GAST through the NTP protocol using the campus LAN.
Folie 20 > Vortrag > AutorDokumentname > 23.11.2004
J. Furthner, Institute of Communications and Navigation, DLRGTFS 2005, 05.12.2005, Herrsching, Germany <20>
GTF – Physical Architecture
DLR Time Lab
GPS receptionsub-system
Equipment of DLR Time Lab
GPS RX 1 PC1
GTF
NTP server
UTC(DLR)/GASTgenerationsub-system
UPS
WANI/F 1
Power supply 1 PPS 10 MHz Data GPS signals
Networkinterface
GPS RX 2BIPM/IERS Interfacesub-system
WANI/F 2
GPF/GMCF
GPF/GMCF
PC2
Folie 21 > Vortrag > AutorDokumentname > 23.11.2004
J. Furthner, Institute of Communications and Navigation, DLRGTFS 2005, 05.12.2005, Herrsching, Germany <21>
GTF – Physical Architecture
Clock subsystem
Phase microstepper
Switch
Measuring subsystem
Phase microstepper
GAST realisation subsystem
GPS Rx GPS Rx
To GATE Control Center
Control PC Control PC
GAST processing
GPS Rx
Control PC
UTC(DLR)
To GATE Control Center
Control CenterInterface
Folie 22 > Vortrag > AutorDokumentname > 23.11.2004
J. Furthner, Institute of Communications and Navigation, DLRGTFS 2005, 05.12.2005, Herrsching, Germany <22>
PTF – Physical Architecture
Clock subsystem Measurement subsystem
GST processing
Precise Timing Facility
Time Service Provider
GST-to-TAI correction
GST realization subsystem
GPSconstellation
Galileoconstellation
GSTGPSSIS IF
Galileosensor station
GPS/Galileotime offsetprocessing
Folie 23 > Vortrag > AutorDokumentname > 23.11.2004
J. Furthner, Institute of Communications and Navigation, DLRGTFS 2005, 05.12.2005, Herrsching, Germany <23>
Controlling of GTF via GMCF
Folie 24 > Vortrag > AutorDokumentname > 23.11.2004
J. Furthner, Institute of Communications and Navigation, DLRGTFS 2005, 05.12.2005, Herrsching, Germany <24>
Controlling of GTF via GMCF
Folie 25 > Vortrag > AutorDokumentname > 23.11.2004
J. Furthner, Institute of Communications and Navigation, DLRGTFS 2005, 05.12.2005, Herrsching, Germany <25>
Controlling of GTF via GMCF
Folie 26 > Vortrag > AutorDokumentname > 23.11.2004
J. Furthner, Institute of Communications and Navigation, DLRGTFS 2005, 05.12.2005, Herrsching, Germany <26>
GTF – Man Machine Interface at the GMCF
Folie 27 > Vortrag > AutorDokumentname > 23.11.2004
J. Furthner, Institute of Communications and Navigation, DLRGTFS 2005, 05.12.2005, Herrsching, Germany <27>
The GTF at DLR Time Laboratory
UTC(DLR) Time Laboratory
GTF
Folie 28 > Vortrag > AutorDokumentname > 23.11.2004
J. Furthner, Institute of Communications and Navigation, DLRGTFS 2005, 05.12.2005, Herrsching, Germany <28>
Thank you for your attention