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CCSDS Navigation Working Group

CCSDS Navigation Working Group. David Berry 10/13/2008. Purpose. Introduce new members of the CCSDS Navigation Working Group to the technical program of the Working Group. Agenda. CCSDS Overview Navigation Working Group Overview Navigation Working Group Documents Q&A.

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CCSDS Navigation Working Group

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  1. CCSDS Navigation Working Group David Berry 10/13/2008

  2. Purpose • Introduce new members of the CCSDS Navigation Working Group to the technical program of the Working Group

  3. Agenda • CCSDS Overview • Navigation Working Group Overview • Navigation Working Group Documents • Q&A

  4. CCSDS & the Navigation Working Group • CCSDS is an organization which acts as the “principal technical engine of ISO TC20/SC13” • Develops international standards related to space data • Organization chart at http://public.ccsds.org/sites/cwe/default.aspx • CCSDS consists of 6 general “Areas” • Areas are partitioned into 34 smaller groups called “Working Groups” (WG), “Special Interest Groups” (SIG) and “Birds of a Feather Groups” (BOF) • Each WG, SIG or BOF is associated with an Area • NAV WG is part of CCSDS Mission Operations and Information Management Services Area (MOIMS) • Charter is to produce CCSDS Recommendations for exchange formats of orbit, attitude, and tracking data

  5. CCSDS Areas (Overall Context) FlightFlight Orbit Data Message (OPM/OEM), Attitude Data Message (APM/AEM), Tracking Data Message (TDM) XML Specification (NDM/XML) Spacecraft Onboard Interface Services Space Internetworking Services Mission Operations and Information Management Services Commodity Communications & Navigation Systems Space Link Services GroundGround, GroundFlight Orbit Data Message (OPM/OMM/OEM) Attitude Data Message (APM/AEM) Tracking Data Message (TDM) XML Specification (NDM/XML) Systems Engineering Cross Support Services Source: A. Hooke, NASA/JPL

  6. Standards Development Process • A “Concept Paper” suggests need for standardization • Working Group chartered to develop Recommendation • Working Group develops material (iterative process) • Recommendation documents proceed through several stages as they mature: Proposed (“White”), Draft (“Red”), final (“Blue”) • White Books are internal to the Working Group • When White Book matures, promotion to Red Book • Formal Agency Review process commences (3 months) • When Agency Review is passed, prototyping (at least 2 interoperable instances) is complete and test reports filed, promotion to Blue Book occurs • ISO standards development process is entered at an advanced stage (FDIS) • “Green Books” are non-normative technical reports

  7. Nav WG Participating Membership • The CCSDS Navigation Working Group has had regular participation from the following space agency/organizations: • ASI • CNES • DLR • ESA • JAXA • NASA (JPL, GSFC, JSC) • ISO TC20/SC14/WG3 • Agencies that have recently named representatives to the Navigation WG are: FSA • Other agencies that participate in CCSDS , but have not been involved in Navigation WG are: BNSC, CSA, INPE • New CCSDS Agency: CNSA - China National Space Administration

  8. Nav WG Documents (“Color Coded”) • Orbit Data Messages+ Extensions • Tracking Data Message • Attitude Data Messages • Navigation Data Messages / XML Specification • Navigation Data—Definitions and Conventions • The principal objectives for the Fall 2008 Meetings are to prepare the ODM Version 2 for Blue Book conversion and prepare the NDM/XML for Agency Review (Red Book 2.0)

  9. Orbit Data Messages + Extensions • Two standard message formats for exchanging orbit descriptions, soon to be three • Orbit Parameter Message (OPM) is a state vector (position and velocity at epoch, spacecraft properties, maneuvers, descriptive metadata); must be propagated • Orbit Ephemeris Message (OEM) is an ephemeris (position and velocity at multiple epochs, descriptive metadata), allows modeling of any number of forces • Work started ???, became CCSDS Blue Book 09/2004 (ISO Standard # 22644 as of 01/2006) • Orbit Data Messages are used in daily operations • Extensions to the ODM (OMM) are a current topic of the Navigation WG via collaboration with ISO TC20/SC14, with visibility up to top levels of CCSDS and ISO TC20

  10. Remaining Work for “ODM Blue 2.0” • Major Working Group Task for 2008 • Formal Review: CCSDS Agency Review + ISO Review • Develop plan for prototyping • Complete design/development/testing of ODM Prototypes • File prototyping test report • Petition the CESG and CMC for progression from Pink Book to Blue Book • Other desirable work • Agency/Operator infusion (implementation)

  11. Navigation Data Messages / XML Spec • Describes an integrated XML schema set for encoding the ADM, ODM, and TDM • Directive to put Navigation WG Recommendations into XML format came from CMC ~2002 • Work started 05/2004, became Red Book 11/2005 (prematurely) • One Agency Review process completed, <10 RID’s received, dispositioned, and added to NDM/XML as applicable • Second agency review yet to be scheduled • Current level is Red Book 1.4 • Plan to progress to Blue Book by EOY 2009 (was 2008)

  12. Remaining Work for “NDM/XML Blue” • Major Working Group task for 2008 • Complete ODM Blue Book 2.0 (TC20/SC14 updates) • Update NDM/XML to represent final ADM, ODM • Complete Agency Review #2 (not yet scheduled) • Create prototyping plan • Complete design/development/testing of NDM/XML Prototypes • File prototyping test report • Petition the CESG and CMC for progression from Red Book to Blue Book • Other desirable work • Agency infusion (implementation)

  13. Tracking Data Message • Standard message format for exchanging tracking data • TDM supports widely used tracking data types: • Ground-based radiometrics: Doppler, range, angle, ΔDOR • Ancillary information (e.g., meteorological, media delays) • Extensible to future types (e.g., SC-to-SC Doppler/range) • Work started 10/2003, became Blue Book 11/2007 • Infusion in progress at ESA, NASA/JPL, and ISRO; DLR has a prototype implementation • Other desirable work • Further agency infusion

  14. Attitude Data Messages • Two standard message formats for exchanging spacecraft attitude descriptions • Attitude Parameter Message (APM) specifies an attitude state at epoch, and includes spacecraft properties, maneuvers, descriptive metadata; must be propagated • Attitude Ephemeris Message (AEM) specifies a series of attitude states at multiple epochs, descriptive metadata, allows modelling of any number of torques • Work started ~2003, became Blue Book 05/2008 • Other desirable work • Complete XML representation of the ADM (currently updated to B1.0 compatibility, still in work) • Agency infusion (implementation)

  15. Navigation DataDefinitions and Conventions • Contains technical material related to the Navigation Working Group Recommendations • Non-normative document • Has a different development process (all internal to the working group, with CESG approval) • Work started early in the history of the Navigation Working Group • Most recent edition of the Green Book was published 11/2005 • Current level is Green 2.0 • Several updates to this document are in order (more attitude info, covariance matrices, TLE overview, mean elements overview, range units description) • Work is lower in priority than the normative documents

  16. Useful Web Sites/Contacts • Web Sites • www.ccsds.org – general web site of the CCSDS • http://cwe.ccsds.org/moims/default.aspx , then choose the “MOIMS-NAV” tab on the far left menu • E-mail Address • moims-nav@mailman.ccsds.org

  17. Acronyms and Abbreviations • ADM Attitude Data Message • CCSDS Consultative Committee on Space Data Systems • CESG CCSDS Engineering Steering Group • CMC CCSDS Management Council • ΔDOR Delta Differential One-Way Ranging • ISO International Organization for Standardization • MOIMS Mission Operations & Information Mgmt Services • NDM Navigation Data Messages • ODM Orbit Data Message • OEM Orbit Ephemeris Message • OMM Orbit Mean-Elements Message • OPM Orbit Parameter Message • TDM Tracking Data Message • XML eXtensible Markup Language

  18. Q&A • ??? • ??? • ??? • ??? • ??? • ??? • ??? • ??? • ??? • ??? • ???

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