XASTRO2 EGOS 2004 15th June 2004 N' Lindman1, A'Walsh2, P' Ellsiepen2, S' Spacey2, A' Crowson3, M' D - PowerPoint PPT Presentation

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XASTRO2 EGOS 2004 15th June 2004 N' Lindman1, A'Walsh2, P' Ellsiepen2, S' Spacey2, A' Crowson3, M' D

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Outcome available at http://www.vega.de/xastro1/ XASTRO-2, EGOS 2004. 5 ... Collaboration web site deployed at http://portal.vega.de/xastro. XASTRO-2, EGOS 2004 ... – PowerPoint PPT presentation

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Title: XASTRO2 EGOS 2004 15th June 2004 N' Lindman1, A'Walsh2, P' Ellsiepen2, S' Spacey2, A' Crowson3, M' D


1
XASTRO2EGOS 200415th June 2004 N.
Lindman1, A.Walsh2, P. Ellsiepen2, S. Spacey2, A.
Crowson3, M. Dyck31European Space Agency,
European Space Operations Center, Darmstadt,
Germany.2VEGA IT GmbH, Darmstadt,
Germany.3Anite Systems GmbH, Darmstadt, Germany
2
Presentation Outline
  • Background
  • Overview
  • Objectives
  • Technical Solution
  • Reference Architecture
  • Relation with CCSDS RASDS
  • Example Model
  • Challenges
  • Conclusion

3
Background
  • ESA/ESOC Study Contract
  • Following on from XASTRO-1 study (2002-2003)
  • Modelling of ESAs Ground System to improve data
    exchange and software interoperability
  • Part of a wider ESA initiative concerned with the
    harmonisation of Ground System Software
  • Project started in January 2004 and scheduled to
    run into early 2005

4
Overview XASTRO-1 Study
  • Objective Investigate if the open standard
    technologies ofUML XML can be used to model a
    space system and its data
  • Motivation improve data exchange between
    customers, contractors and suppliers
  • Context XASTRO-1 was executed under ESAs
    Innovative Technology Programme
  • Focus Primarily on space segment, although the
    same principles would be applicable to other
    segments.
  • Outcome available at http//www.vega.de/xastro1/

5
Overview XASTRO-2 Study
  • Apply same modelling approach adopted by XASTRO-1
  • Focus is on the modelling of ESAs Ground System
  • ESA TRP Study
  • Analysis phase
  • Identify requirements on framework and tools
  • Development Phase
  • Framework and Tools
  • Ground System Models
  • Coordinated with parallel XASTRO-2B study, which
    focuses on modelling and applications

6
Objectives
  • Improve Interoperability between Ground Systems
    through the formal definition of Ground System
  • Information
  • Services
  • Reference Architecture
  • Requirements
  • Ground Systems Architecture formalised
    specification
  • Promote Automation in Ground System Operations
  • Ground System Configuration
  • Documentation Production

7
Technical Solution
  • Modelling Framework and Tools
  • Modelling Language (Meta-model)
  • Modelling Tools (Editors)
  • GSIM Ground System Information Model
  • Standard Types (Services and Data Models)
  • MIM Mission Information Model
  • CryoSat (reference mission)
  • GOSIF Ground Operations Systems Information
    Framework
  • Model Storage
  • Applications (Generators/Translators, Special
    Editors)

8
Framework Modelling Language
  • Based on MDA modelling approach and aligned with
    upcoming UML 2.0 standard
  • Separation of concerns via viewpoints
  • Hierarchical decomposition of components
  • Separation of Types Instances (re-use of
    building blocks)
  • GSIM (Types)
  • MIM (Instances)
  • Information and service modelling
  • Requirements modelling
  • External References (documents, behaviour etc.)

9
Framework Viewpoints
Standardised Data Models
Information Viewpoint

Standardised Services
XASTRO-2 Framework
Functional Viewpoint
Enterprise Viewpoint
Physical Viewpoint
Communications Viewpoint
10
Framework Platform Independence
  • MDA supports platform independent models (PIM)
    and platform specific models (PSM)
  • Separation of model from technology
  • XASTRO-2 supports platform independence
  • XASTRO-2 defines following mappings between PIM
    and PSMs
  • XML Schema
  • CORBA IDL

PIM
PSM
PSM
PSM
11
Ground System Information Model
A library of reusable ground system services,
components and information types
12
Mission Information Model
Mission instance of a Ground System
13
Framework, Models and Applications
GOSIF Applications (XML Server)
XASTRO-2 Framework Applications (Editor)
Applications

XASTRO-2 Framework
GSIM
MIM
Framework Models
14
Relationship with UML 2.0
  • UML 2.0 is currently being finalised by OMG
  • UML 2.0 and supporting tools not yet mature
  • UML 2.0 identified as suitable modelling language
    for XASTRO-2 once it is mature
  • Industry acceptance
  • Excellent tool support
  • Profile would have to be developed to incoperate
    all XASTRO-2 viewpoint concepts
  • Translation of models between UML 2.0 and
    XASTRO-2 languages should be possible
  • SysML, a daughter language of UML 2.0, has been
    identified as even more suitable, but less mature

15
Ground System Reference Architecture
  • Formalise the services and information provided
    by the ground systems
  • Promotes interoperability by formalised
    definition of services to allow software
    interface generation
  • Promotes plug play of ground system components
  • Communicate the architecture unambiguously to all
    stakeholders.
  • To understand the BIG picture!

16
Reference Architecture Systems
  • Systems to be considered
  • MCS Kernel including Web-remote monitoring and
    Telemetry Data Retrieval System
  • Network Interface System (NCTRS including SLE
    Services)
  • Ground Station Back-end System (TMTCS, STC, MCM)
  • Flight Dynamics System
  • MCS Ancillary system Mission Planning System,
    Generic Data Distribution, Generic File Transfer,
    External Interfaces.

17
Information Model XTCE PIM Example
18
Information Model XTCE PSM
19
Relationship with CCSDS RASDS
  • The CCSDS System Architecture Working Group
    (SAWG) defining a reference architecture for
    space data systems (RASDS)
  • Based on an adapted version of RM-ODP
  • RASDS defines a set of viewpoints specialised for
    space data systems
  • XASTRO-2 working with SAWG and aligned with RASDS
  • XASTRO-2 to provide language and tools for
    developing RASDS models

20
Challenges
  • This is a huge undertaking
  • Large and complex systems
  • Large number of information types and services
    with a ground system
  • Many different domains
  • Need to focus on subset of systems
  • Need to find right architecture granularity
  • Need to collaborate, in particular with the
    European Ground Software Technology Harmonisation
    and the CCSDS. Collaboration web site deployed at
    http//portal.vega.de/xastro

21
Conclusions
  • There is a need to harmonise ground systems from
    a development, maintenance, operations and
    configuration aspect
  • There is a need to standardize the ground systems
    services and data models
  • There is a need to improve the information
    exchange within the ground systems
  • This study tries to answer above needs by
    providing a ground systems reference architecture
    and information framework

22
Thank You For Your AttentionAny Questions?
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