Delta-DOR SIG Minutes of the meeting Heppenheim, Germany October 2nd, 2007 Roberto Maddè ESA/ESOC

List of participants  Roberto Maddè, ESA/ESOC, chair  James Border, NASA/JPL, member  Hiroshi Takeuchi, Jaxa/ISAS, member  Mattia Mercolino, ESA/ESOC, member

Adoption of the agenda  Introduction of the DDOR SIG  Presentation of the SIG with plans, roles, responsibilities and milestones, to make it a WG  Open discussion  Presentation of JPL: Considerations on DOR tone frequency and structure  Presentation of JAXA on ongoing activities for cross- cooperation  Presentation of ESA on ongoing activities for cross-cooperation  Open discussion

1.1 Support to the proposed Working Group  ESA stated that such support is granted.  NASA/JPL stated that the support is in principle granted and will confirm what the necessary steps to get the formal approval are (if any), by Oct.19 th  Jaxa stated that the support is in principle granted and will confirm what the necessary steps to get the formal approval are (if any), by Oct. 19 th.

1.2 Adoption of a charter  The charter recently distributed has been discussed  Few changes have been implemented  The SIG considers that the current version is suitable for discussion and/or approval for the CESG and CMC.

2.1 Definition of roles and responsibilities (1)  ESA will be the Editor of the 2 foreseen books  Table of contents for the Magenta Book:  General introduction  Introductory chapter, derived from current ch. 2 of the WB (MM)  End-to-end description, based on current ch. 3 of the WB (MM)  Interfaces description and references to existing/to be updated Blue Books (RM)  Configuration of the Delta-DOR measurement (MM) Station and spacecraft parameters Orbit ephemeris parameters Scheduling Data transfer procedures Correlation process parameters Operational validation aspects  Interagency data exchange procedures (JB)  Interoperability validation process (JB-MM-HT)  Quasar catalogue implementation, validation and maintenance (HT-JB)

2.2 Definition of roles and responsibilities (2)  Draft table of contents of the Green Book:  Overview of the process  Theoretical background  System rationale and trade-offs  Description of existing systems  Achievable performance  Delta-DOR related techniques Phase referencing Same Beam Interferometry  The table of contents will be finalised in the Fall 2008 Meeting  Roles and responsibilities will be defined in the Fall 2008 Meeting

2. 3 Agreed milestones DateMilestone October 2007WG kick-off (if approved) April 2008 Draft “Delta-DOR recommended practice for cross support” Magenta Book for the CCSDS 2008 Spring meeting August 2008 Revised draft “Delta-DOR recommended practice for cross support” Magenta Book for Agency review Fall 2008 Second issue of “Delta-DOR recommended practice for cross support” after Agency review for CCSDS 2008 Fall Meeting Discussion on “Delta-DOR technical characteristics and performance” Green Book and work distribution December 2008 Finalised review and issue “Delta-DOR recommended practice for cross support” Magenta Book April 2009 Draft “Delta-DOR technical characteristics and performance” Green Book for CCSDS 2009 Spring meeting July 2009 Revised draft “Delta-DOR technical characteristics and performance” Green Book Fall 2009 Finalised review and issue “Delta-DOR technical characteristics and performance” Green Book for CCSDS 2009 Fall meeting

4. JPL presentation – conclusions (1)

4. JPL presentation – conclusions (2)  It was agreed that the material presented by JPL needs to be considered carefully in view of enhanced performance, to be proposed to future missions  Implication of flexibility on tone position and structure (i.e. the possibility of spreading the tones) to be:  First discussed within the WG, including feedback with transponder, Ground station and spectrum management specialists  Later, discussed with SLS-RNG

5. Jaxa presentation – conclusions  Jaxa presented their current activities  Jaxa will be able to provide raw data either in K5, Mk5 or VSR format  Jaxa proposed to introduce the description of other techniques in the coming Green Book; this proposal has been accepted and the draft table of contents is already updated.  Jaxa plans to use VLBI-related techniques on current and coming missions

6. ESA presentation  ESA presented the status of cross-cooperation with JPL and JAXA  The development of raw data translators is acknowledged to be right way to go, to insure interoperability, in the short time scale  The use of a Common Data Format (CDF) for the exchange of raw data can be the good solution, in the long term  The approach followed by ESA to validate their Delta-DOR interoperability concept with JPL can be taken as a guideline for the coming Magenta Book (chapter “Interoperability Validation process”)

Conclusions  The support of 3 agencies to the proposed WG has been assessed (NASA and JAXA have to formally state their support)  The Charter has been discussed and finalised  The TOC of the proposed Magenta and Green Books has been discussed and agreed  Roles and responsibilities for the Magenta Book have been agreed  The schedule and milestones for the books preparation have been agreed  Suggestions coming from NASA, JAXA and ESA presentations have been collected and will be inserted in the coming books, as required