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Ferrato_ Alenia
1.
The Galileo Precise
Timing Facility software architecture Andrea Ferrato (AleniaSIA S.p.A., Consorzio Torino Time) ITN - Oct 15, 2009 - Turin | © 2009 AleniaSIA S.p.A. - tutti i diritti riservati 1
2.
Outline •
AleniaSIA overview • What is PTF • PTF software tasks • PTF software architecture – Chosen software platform – Implementation details – Applied standards • Closing remarks ITN - Oct 15, 2009 - Turin | © 2009 AleniaSIA S.p.A. - tutti i diritti riservati 2
3.
AleniaSIA overview
Shareholders: 60% 30% 10% Aeronautical Avionic SW & M346 Master systems 16% EuroFighter Main programs Flight Market areas Space management Logistic UAVs 35% support, analysis IXV and tools Defense 16% ATR C27-J Test tools Training tools AW139 Transport 16% 17% Galileo ITN - Oct 15, 2009 - Turin | © 2009 AleniaSIA S.p.A. - tutti i diritti riservati 3
4.
What is PTF •
Part of Galileo Ground Mission Segment • Generates Galileo System Time for synchronization of the satellite constellation and depending services Sync() Sync() Sync() Galileo Ground Mission Segment GACF PTF Rest of GMS ITN - Oct 15, 2009 - Turin | © 2009 AleniaSIA S.p.A. - tutti i diritti riservati 4
5.
What is PTF
(2) H-Maser pStepper clocks Switching Distri- Matrix butors GST Caesium Time acq. clocks Time PTF Transfer Time acq. Internal LAN PTF PTF Control & Router Control Computer Rest Algorithms SW of GMS PTF Data LAN ITN - Oct 15, 2009 - Turin | © 2009 AleniaSIA S.p.A. - tutti i diritti riservati 5
6.
PTF software tasks
• GST stabilization, via: – Internally-run algorithms (prototyped by TAS-I, INRiM, Politecnico di Torino) – Comparison with Temps Atomique International, NavStar timescale, PTF-2 timescale • Monitoring & Control of internal hardware • Interaction with the rest of GMS – Status information to GACF – Data exchange with other elements ⇒ many tasks & criticalities, one system ITN - Oct 15, 2009 - Turin | © 2009 AleniaSIA S.p.A. - tutti i diritti riservati 6
7.
PTF software architecture:
chosen platform • LynuxWorks LynxOS-178: – OS designed for safety-critical, multi- process applications – Based on open standards (POSIX, ARINC- 653) – Federated architecture: each process is put in a partition with a strictly time- and space- constrained execution window ⇒ partition ≈ separate machine ITN - Oct 15, 2009 - Turin | © 2009 AleniaSIA S.p.A. - tutti i diritti riservati 7
8.
PTF software architecture:
implementation details ARINC-653 API Interpartition comm. (ARINC multicast) p4 p3 p2 p1 p0 PTF Steering System PTF External SNMP Control & Manager Manager Handler I/F M&C (DAL-C) (DAL-C) (DAL-C) (DAL-E) (DAL-E) Algorithms SW Lynx Certifiable Stack API (proxy-based approach) LynxOS-178 kernel Scalable / Rest of File transfer Commanding (FTP/TCP) distributable and monitoring GMS (SNMP/UDP) GACF ITN - Oct 15, 2009 - Turin | © 2009 AleniaSIA S.p.A. - tutti i diritti riservati 8
9.
PTF software architecture:
applied standards • Galileo Software Standard (tailored on RTCA DO-178B) – Waterfall development model – Highest criticality level: DAL-C • Avionics-like Verification and Validation process – Low level (i.e. unit testing, coverage analysis) – High level (i.e. integration, validation against requirements) ITN - Oct 15, 2009 - Turin | © 2009 AleniaSIA S.p.A. - tutti i diritti riservati 9
10.
PTF software architecture:
applied standards (2) Activity Adopted tools and methods Memory profiling http://valgrind.org/, LynuxWorks SpyKer Code static analysis http://www.splint.org/ Functional unit- and IPL Cantata++ integration- testing 100% statement coverage IPL Cantata++ Validation against CI and [custom procedures] software system requirements ITN - Oct 15, 2009 - Turin | © 2009 AleniaSIA S.p.A. - tutti i diritti riservati 10
11.
Closing remarks • Significant
know-how acquisition – Formal: management of high-level standards (GSWS) and processes (GSWS Waterfall DAL-C) – Technical: on the design and implementation of ARINC-653-based architectures (i.e. IMA avionics) – Contextual: probable involvement as partners in the next Galileo PTF phase (“Full Orbit Configuration”) Thank you! ITN - Oct 15, 2009 - Turin | © 2009 AleniaSIA S.p.A. - tutti i diritti riservati 11
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