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

10/13/20083 Agenda CCSDS Overview Navigation Working Group Overview Navigation Working Group Documents Q&A

10/13/20084 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 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

10/13/20085 CCSDS Areas (Overall Context) Cross Support Services Spacecraft Onboard Interface Services Space Internetworking Services Space Link Services Mission Operations and Information Management Services Commodity Communications & Navigation Systems Systems Engineering Source: A. Hooke, NASA/JPL Ground  Ground, Ground  Flight Orbit Data Message (OPM/OMM/OEM) Attitude Data Message (APM/AEM) Tracking Data Message (TDM) XML Specification (NDM/XML) Flight  Flight Orbit Data Message (OPM/OEM), Attitude Data Message (APM/AEM), Tracking Data Message (TDM) XML Specification (NDM/XML)

10/13/20086 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

10/13/20087 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

10/13/20088 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)

10/13/20089 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 # 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

10/13/ 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) Remaining Work for “ODM Blue 2.0”

10/13/ 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)

10/13/ 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) Remaining Work for “NDM/XML Blue”

10/13/ 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

10/13/ 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)

10/13/ Navigation Data Definitions 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

10/13/ Useful Web Sites/Contacts Web Sites – general web site of the CCSDSwww.ccsds.org then choose the “MOIMS-NAV” tab on the far left menuhttp://cwe.ccsds.org/moims/default.aspx Address

10/13/ Acronyms and Abbreviations ADMAttitude Data Message CCSDSConsultative Committee on Space Data Systems CESGCCSDS Engineering Steering Group CMCCCSDS Management Council ΔDORDelta Differential One-Way Ranging ISOInternational Organization for Standardization MOIMSMission Operations & Information Mgmt Services NDMNavigation Data Messages ODMOrbit Data Message OEMOrbit Ephemeris Message OMMOrbit Mean-Elements Message OPMOrbit Parameter Message TDMTracking Data Message XMLeXtensible Markup Language

10/13/ Q&A ???