1. CCSDS XML Telemetric and Command Exchange (XTCE)
Dan Smith - Ronald Jones - Kevin Rice
(NASA/GSFC)
March 2015

2. Agenda XTCE Status Other XTCE Efforts XTCE Tailoring Guides
XTCE 1.1 to 1.2 Status
Beyond 1.2
CCSDS SM&C Actions
:Validate if MO data model for parameter service fits with XTCE
Other XTCE Efforts

3. XTCE Tailoring Guides

4. OMG XTCE 1.1 Document Tree Specification
(document, template)
XTCE 1.1
(March 2008)
XTCE
USA GovSat
Conformance Profile
(November 2014)
XTCE 1.1
Associated
Schema File
(November 2006)
1. Can add as many Tailoring Guides as required
Intend to publish revision to GovSat in parallel with XTCE 1.2

5. CCSDS XTCE 1.1 Document Tree
Yellow Book ??
(OMG specification)
SANA Registry ??
(OMG rules table)
Blue Book
Green Book
XTCE 1.1
Informational Report CCSDS G-1
(July 2006)
Update to 1.2
Recommended Standard
CCSDS B-1
(October 2007)
XTCE
USA GOVSAT
Conformance Profile
(Nov 2014)
XTCE-CC
Draft ICD
(2015)
XTCE 1.1 Element Description Report
CCSDS G-1
(May2012)
Update to 1.2
XTCE 1.2
Recommended
Standard
CCSDS B-2
Replace XTCE 1.1
(2015)
Key: Red outlined box = CCSDS Approved Document
Red dashed box = CCSDS/OMG document in work
Host XTCE Tailoring Guides on both OMG & CCSDS Websites

6. XTCE 1.1 to 1.2 Status

7. OMG XTCE 1.1 to 1.2 – RTF Schedule
✔ June 2014 – draft “Change Form”
✔ September 2014 – draft issues to
✔ September 2014 – attended Space Domain Task Force (SDTF) Quarterly Meeting (NASA Goddard, NASA JPL, Industry)
✔ October 2014 – Issues finalized (included 16 ESA, 5 CNES)
May 2015 (was Nov 2014) - submit Change Form to Architecture Board (AB) – slipped due to submitters work load
June 2015 (was Dec 2014) – approved by AB
July 2015 publish
Bullet 2 – range enumerations – example 0-9=OFF, 10-19=ON versus 0=OFF, 1=ON
Bullet 3 – Added Annotation – Not all elements and attributes explain. Not sure why, not enough time, wanted to keep the BB small. Problem left to the User/Implementors interpretation. Some interpreted wrong, others used anyway they wanted.
OMG puts list for each list.
Issues Finalized October > Paperwork --> OMG AB Approve June 2015

8. OMG XTCE 1.1 to 1.2 – Agreements with CCSDS
✔ Distributed accepted issues by spreadsheet to CCSDS SM&C and interested parties
Included ESA and CNES issues
CCSDS agreement – OMG XTCE 1.2 book will be sent out for acceptance and for comment. 
Acceptance - Would like to accept exactly OMG Book, with CCSDS frontal matter included, replaces current CCSDS XTCE 1.1 Blue Book which is due for update.
Comments - All comments received during the CCSDS review will be submitted to OMG for consideration in next XTCE release.
Schedule - CCSDS incorporate all XTCE 1.2 changes
Submit OMG XTCE 1.2 Specification to become Blue Book, replaces XTCE 1.1
Submit XTCE Green Book Pink Sheet showing updates from 1.1 to 1.2
Submit Tailoring Guides (USA, ESA, CNES)
Books - Yellow Book, Magenta Book, SANA Registry - ???
Rules Tables (spreadsheet) - SANA Registry - ???
Bullet 2 – range enumerations – example 0-9=OFF, 10-19=ON versus 0=OFF, 1=ON
Bullet 3 – Added Annotation – Not all elements and attributes explain. Not sure why, not enough time, wanted to keep the BB small. Problem left to the User/Implementors interpretation. Some interpreted wrong, others used anyway they wanted.
OMG puts list for each list.
XTCE 1.2 Blue Book replaces XTCE 1.1 Blue Book

9. OMG Beyond XTCE 1.2 Process:
A new RTF would be formed to address new issues and deferred issues from XTCE 1.2
Depends on community interest, but do not want to wait another 7 years
Significant Changes to XTCE 1.x (i.e. “XTCE 2.0”)
The process would start from scratch again as it re-opens the standard completely
There would be a new RFP issued first, followed by a FTF
Include all comments received during the CCSDS review of XTCE 1.2
Bullet 2 – range enumerations – example 0-9=OFF, 10-19=ON versus 0=OFF, 1=ON
Bullet 3 – Added Annotation – Not all elements and attributes explain. Not sure why, not enough time, wanted to keep the BB small. Problem left to the User/Implementers interpretation. Some interpreted wrong, others used anyway they wanted.
OMG puts list for each list.
Do Not Wait 7 Years

10. MO M&C Services and XTCE Comparison
:Validate if MO data model for directives fits with XTCE
Object Types/Directives - ACTION, PARAMETER, ALERT, CHECK, STATISTICS, AGGREGATION, CONVERSION, GROUP
Goal is to have specific MO M&C Service Tables map to XTCE syntax
Kevin Rice and Sam Cooper worked together to perform mapping
Mapping documented in “SMCtoXTCE_V5.2.docx”
Analysis
Core issue: XTCE is designed to describe the space to ground interface (commands, telemetry packets)
Not a general messaging syntax, but mission ops database language
XTCE describes the binary representation of packets
Not clear to us that its applicable to defining MO M&C Services directives
We believe M&C Service Message need specific schemas
Bullet 2.2 – Example: enumerations described, but associated with mnemonic (parameter) descriptions
Recommend - Message Specific Schemas instead of XTCE (define in CCSDS Book)

11. Example - ACTION MO Service Message in XTCE

12. Example - ACTION MO Service Message in XTCE Continued

13. Other XTCE Efforts

14. Other XTCE work at Goddard
Conversion Tool Developed
ASIST (GOTS T&C) to XTCE
XTCE to ITOS (GOTS T&C)
Tested with real mission data – Solar Dynamic Observatory (SDO)
Other missions pending (RAVEN, GPM, etc…)
Experimented against JPL Schema
XTCE database successfully converted to JPL AMMOS MMD format
Limited testing at this time, but this will be expanded in FY15

15. NASA JPL
Task started in FY12 and looks at approaches to address the rising need to share and interpret information across Centers and Space Agencies.
How we Recognized Success
✔ Year 1 - Did we learned enough about XTCE and AMMOS missions to make a judgment on applicability of XTCE for use across AMMOS?
✔ Year 2 – Are JPL missions and XTCE ready to move towards operational use?
Goddard responsible for XTCE technical tools (XTCE to MMD, MMD to XTCE)
JPL concurs on readiness for infusion to a JPL mission through the Multi-Mission Dictionaries (MMD)
Year 3 and beyond – XTCE standard infused across multiple JPL and other NASA Centers applications and missions
Europa Clipper, JPL Core FSW
Potentially other: Mars 2020, INSPIRE CubeSat, JSC
Workshops
GSAW (California, USA) – March 2015
ESAW (Darmstadt, Germany) – June 2015