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MINUTES OF THE P1J WORKSHOP
May 9-10, 2001
The Spring 2001 P1J workshop was conducted at the ESA/ESOC facility, Darmstadt, Germany, May 9-10, 2001.
A. PARTICIPANTS
Felipe Flores-Amaya/Chairman (NASA/GSFC), Alberto Cangahuala (NASA/JPL), Manfred Drexler (DLR/TSG Chairman), Jacques Foliard (CNES), Joseph Guinn (NASA/JPL), Reinhard Kiehling (DLR), Michel Morlon (ESA/ESOC/P1 Chairman), Guillermo Ortega (ESA/ESTEC), Siegmar Pallaschke (ESA/ESOC), Mikio Sawabe (NASDA).
B. AGENDA
This is the actual agenda as modified at the workshop
May 9, 2001
9:00 a.m. Introduction
Review of Last Minutes
Status of Green Book (GB)
9:30 am Review of OPM White Book (WB)
10:15 am 12:00 m Lunch
1:00 p.m. Continued review of WB
3:00 p.m. Break (15 min.)
3:20 p.m. Prepare presentation for P1K/P1J joint meeting; per action item TSG-99-14: P1J and P1K (SOIF) to cooperate on the issue of on-board timing
4:00 p.m. Action Items
5:00 p.m. Adjourn
May 10, 2001
9:00 a.m. Issues from workshop between NASA/JPL and ESA/ESOC
10:30 a.m. Break (15 min.)
10:45 am Review of Action Items
Finalize P1J GB for submittal (All day)
12:00 m Lunch (1-hr)
3:00 p.m. Break (15 min.)
4:00 p.m. Action Items
5:00 p.m. Adjourn
May 22, 2001
Joint Panel Meeting P1J/P1K at Pasadena, California, USA
To discuss the issue of on-board timing aspects (Action TSG-99-14)
C. ACTION ITEMS
New:
P1J-S2001-01
Meet or contact Damien Maeusli to discuss additional details for the objectives of the P1J/P1K joint meeting. Report results to P1J prior to the joint meeting on May 22.
Assignee: G. Ortega
Due date: May 17
P1J-S2001-02: Collection of prioritized requirements and existing or proposed tracking data formats/messages, from each agency, for the development of a green and/or red books of recommendations for ground-to-ground tracking data.
Assignee: All, M. Sawabe (lead)
Due date: July 31
Old action items:
Items 1-5, pertain to the final version of the green book, and must be completed on time; as P1J has resolved to release this document by the TSG meeting of May 24.
P1J-Vilspa-1: Provide text for section 4.3.2.2, on planetary ephemeris reference system. Verify consistency in numbering of sections.
Assignee: S. Pallaschke
Due date: May 17
P1J-Vilspa-2: Provide text for section 4.3.2.5, relationships between common reference frames.
Assignee: Al Cangahuala, S. Pallaschke
Due date: May 17
P1J-Vilspa-3: Add reference for time scales in section 4.4.2.
Add text for ephemeris time and reference for UTC to section 4.4.2.1. Assignee: R. Kiehling (4.4.2), Al Cangahuala and S. Pallaschke (4.4.2.1)
Due date: CLOSED
P1J-Vilspa-4: Verify consistency of quaternion definition, section 5.3.1, in reference to existing documents, formation flying and rendezvous cases.
Assignee: G. Ortega
Due date: May 17
P1J-Vilspa-5: Provide text for definition of products to be exchanged between agencies, in chapter 5. Topics: attitude, ICVs, complete orbit history, OPM reference, etc. Verify that table 5-1 has correct symbols. Ensure chapter 5 is complete.
Assignee: G. Ortega and R. Kiehling (section 5.2.2 add more text), Al Cangahuala and R. Kiehling (section 5.2.3 CLOSED), J. Foliard (section 5.3.2), Al Cangahuala (sections 5.2.4, 5.4 add introduction, 5.5 add more examples).
Due date: May 17
P1J-Vilspa-6: Development of a red book of recommendations for ICV and ephemeris.
Assignee: Al Cangahuala and R. Kiehling
Due date: CLOSED
P1J-Vilspa-7: Development of a red book of recommendations for attitude.
Assignee: J. Foliard and G. Ortega
Due date: June 15 (first draft).
P1J-Vilspa-8: Collection of requirements for development of a red book of recommendations for ground tracking data.
Assignee: All, M. Sawabe (lead)
Due date: CLOSED (Replaced with new A.I.-02)
P1J-Vilspa-9: Development of a red book of recommendations pertaining to the exchange of navigation data for proximity operations. Flight to flight cases. (Ref. Joint panels 1A, 1B, 1E, 1J meeting Oct 2000.)
Assignee: J. Guinn and G. Ortega (lead)
Due date: July 31 (first draft).
P1J-Vilspa-10: Development of a red book for recommendations pertaining to the consistency in environmental models and astrodynamic constants.
Assignee: J. Foliard (lead) and M. Sawabe
Due date: Fall 2001 (first draft).
D. P1J MEETING NOTES
Day 1
To prepare for the joint session with the ESOC/JPL navigation workshop, started the review of the white book, "Orbit Data messages", since this will be the main topic for the joint session.
Al Cangahuala and G. Ortega agreed to represent P1J at the P1J/P1K joint meeting, at Pasadena, California, on May 22. J. Foliard will try to attend, too. The P1J chairman does not anticipate being able to support this meeting, nor the P1 Plenary and TSG meetings, because of limited travel funding.
Al Cangahuala will represent P1J at the P1 Plenary and TSG meetings.
P1J documents are being prepared based on current methods. Other formats, such as XML, will be considered in the future.
Most of the day worked on the review of the white book. Minor changes will be made; but document is now ready to be finalized and released. This will be reported to the TSG on May 24.
RESOLUTION 1: White Book, "Orbit Data Messages", is now ready to be submitted to CCSDS for agency review and future conversion to red book status.
Conducted a discussion to identify topics for a presentation to the joint P1J/P1K meeting, about the topic of on-board timing. The purpose is to define a standard(s) for the transfer of time information in a manner that is compatible for all users. The following scenarios may be outlined: Earth orbiting service, other planetary services, precision and accuracy, etc.
Additional discussions will be held with P1K, prior to the meeting on May 22, to clarify areas of mutual interest. Refer to new action item 1.
Regarding the definitions of OPM and EPM in the new P1J white book, G. Ortega was planning to test the transmission of the message using the STRV spacecraft; but this option went away after the spacecraft failed.
Day 2
Held a joint session with ESA/ESOC/JPL navigation personnel:
- JPL is pursuing the automation of DSN tracking.
- JPL and ESOC will formalize the implementation of the P1J developed OPM and EPM concepts, via an ICD; to be used in support of the ROSETTA and Mars Express missions in 2003 .
- A test will be conducted in the future to verify the correct exchange of these products. Date TBD.
The rest of the day was dedicated to the review of the green book.
All action items were discussed, with emphasis on those pertaining to the green book.
J. Foliard has information from a conference, which may be of interest for the green book. He will provide the report.
If the attitude maneuver section is not completed for the green book; it will be included in the future red book on attitude recommendations.
RESOLUTION 2: Green Book, "Navigation Definitions and Conventions", is now ready to be submitted to CCSDS for publication.
As the white book evolves new concepts will be added; such as OPM and EPM for the flight to flight case.
M. Sawabe provided an example of a tracking data format. Use os ASCII format was suggested. Although NASDA does not typically favor using the ISO time format; they will not oppose its use.
The following elements were identified with respect to tracking data requirements: (Ref. New action item 2)
Acceptable time tag format
ASCII or binary representation
Multiple arrangements of measurements
Flag to indicate whether delays are included
Identify all participants
Allow multiple leg measurements
Flag to indicate whether range ambiguity is included
Report frequency
Observables and computed must be given
Report extra information
J. Guinn (JPL) showed a video of JPL activities with the 2001 Mars Odyssey spacecraft.
The workshop was concluded at the end of day two.
E. FUTURE TASKS
The location of the next P1J workshop was not determined. I will be scheduled in conjunction with the Fall 2001 TSG.
The most immediate future work is listed in the action items above. A complete list of future activities will be provided prior to the next workshop.
F. ACKNOWLEDGEMENTS
P1J members are pleased to express appreciation for the wonderful hospitality and logistics provided by ESA/ESOC personnel during our Spring 2001 workshop.
We thank Mr. Manfred Drexler for his participation in the workshop on day one.
We thank Mr. Michel Morlon for his participation during the introduction.
We enjoyed seeing Dr. Klaus Lenhart, who dropped by to say hello.
End of minutes
May 2001
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