1. XASTRO vs RASDS CCSDS SAWG Meeting

2. Presentation Outline XASTRO study analysis phase conclusions
Relationship between XASTRO and UML 2 / SysML
XASTRO architecture
Relationship between RASDS and XASTRO viewpoints
CCSDS SAWG

3. XASTRO2 Analysis Phase Conculsions
Development of XASTRO metamodel
Alignment with OMG‘s Model Driven Architecture
Based on concepts of RM-ODP
separation of concerns by viewpoints
Very close alignment with RASDS, with focus on formalised language and tool support
some minor differences
Alignment with a subset UML 2.0 \ SysML concepts to enable the development of a UML profile
CCSDS SAWG

4. XASTRO and UML 2.0
UML 2.0 supports many of the modelling requirements of XASTRO
UML 2.0 has much better support for modelling systen architectures
Still being finalised (4Q)
Related technologies still being finalised (MOF and MOF-XML mapping)
Some tools providing limited UML 2.0 support – it is likely to be sometime before there is full support
CCSDS SAWG

5. XASTRO and UML 2.0 Convergence
XASTRO would like to use UML 2.0
Timescale of the XASTRO study however does not fit well with UML 2.0
XASTRO metamodel shall be aligned with UML 2.0
UML 2.0 profile for XASTRO could be defined in the future once the specification and tools become more mature
Take advantage of rich behavioural model
Take advantage of standard tools
Modelling based on accepted technologies
Transformation of models between XASTRO metamodel and XASTRO UML Profile should be possible
Profile for UML 1.4 will be supported for Information Modelling including interchange with XASTRO information viewpoint metamodel
CCSDS SAWG

6. UML 2.0 vs SysML Which is most suitable for XASTRO? SysML advantages
Requirements model
Adds support for modelling physical systems
SysML disadvantages
Removes some UML 2.0 packages (such as deployment) that may be useful for software intensive system
Will have smaller user base and therefore choice of tools is likely to be more limited
UML 2.0 specification and tools will be avaliable earlier
Both are suitable, although Requirements model is very nice feature of SysML
CCSDS SAWG

7. Proposed XASTRO Architecture
12 May 2018
Proposed XASTRO Architecture
GOSIF Applications (XML Server)
XASTRO Applications (Editor)
Applications
XASTRO
Framework
(metamodel)
GSIM
MIM
Framework
& Models
CCSDS SAWG

8. XASTRO Framework (Metamodel)
CCSDS SAWG

9. Separation of Concerns
12 May 2018
Separation of Concerns
Standardised
Data
Models
Information Viewpoint
Standardised
Services
XASTRO2 Framework
Functional Viewpoint
Enterprise Viewpoint
Physical Viewpoint
Communications Viewpoint
CCSDS SAWG

10. Ground System Information Model
12 May 2018
Ground System Information Model
CCSDS SAWG

11. Mission Information Model
12 May 2018
Mission Information Model
CCSDS SAWG

12. Modelling Tools – XASTRO Editor
12 May 2018
Modelling Tools – XASTRO Editor
CCSDS SAWG

13. 12 May 2018
Modelling Tools – UML
CCSDS SAWG

14. XASTRO vs RASDS Viewpoints
Requirements <-> Enterprise
Information <-> Information
Functional <-> Functional
Physical <-> Connectivity
Communications <-> Communications
CCSDS SAWG

15. XASTRO vs RASDS Enterprise Viewpoint
XASTRO does not support the RASDS enterprise viewpoint
Provides requirements model
Supports conformance of system design against requirements
Requirements are assigned to model elements
Base on SysML Requirements Model
CCSDS SAWG

16. Requirement Model Example from SysML
CCSDS SAWG

17. XASTRO vs RASDS Functional Viewpoint
XASTRO functional viewpoint maps well to RASDS
security concerns not addressed in this viewpoint
Supports 3 types of interface, as defined by RM-ODP
Operation
Stream
Signal
Standard services are defined in functional view
Mapping of interfaces to CORBA IDL shall be supported
CCSDS SAWG

18. XASTRO vs RASDS Information Viewpoint
XASTRO information viewpoint maps well to RASDS
The Distribubed Infomation Intrastructure (DII) not supported, although could be modelled in the functional viewpoint
Standard information models (such as XTCE) are defined in the information viewpoint
Modelling of the information viewpoint in UML 1.4 shall be supported
Mapping of information to XML Schema supported
CCSDS SAWG

19. XASTRO vs RASDS Connectivity Viewpoint
Connectivity viewpoint is renamed physical viewpoint in XASTRO
Scope is slightly wider than in RASDS and is not just concerned with connectivity issues between physical system elements
Can assign physical properties to components that represent physcial elements in the real system
CCSDS SAWG

20. XASTRO vs RASDS Communications Viewpoint
XASTRO Communication Viewpoint maps well to RASDS
Is a subset of RM-ODP Engineering Viewpoint
CCSDS SAWG

21. Viewpoint Consistency
Viewpoint consistency not discussed in RASDS
Need to identify relationships between viewpoints
CCSDS SAWG