IGS Analysis Center Workshop - IGS - NASA

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FOREWORDIn May 1993, at the Baltimore IGS oversight committee meeting, we were asked to host a smallworkshop of the IGS Ana[ysis Centers. It was recognized that for such a workshop to serve itspurpose and produce desirable results in time for the o~cial start of the IGS on January 1,1994,it would have to be organized at the working level and include no more than 30 invitedparticipants.In the planning stage, three main topics were proposed for the workshop agenda. The first twotopics identified clear goals to be achieved by the January 1, 1994 deadline: the improvement ofanalysis center products, formats, processing and reporting standards; and the research andselection of methods to generate oflcial IGS ephemerides, which would be more reliable and moreaccurate than the individual center’s orbital solutions. The third topic deals with future directionsfor IGS related research to facilitate rigorous integration of regional networks based ondistributed data processing. Several participants were approached to prepare position papers tobe distributed to the Analysis Centers at least one week prior to the workshop. Session facilitatorswere selected to focus the discussions and prepare written summaries. Finally, each of the sevenAnalysis Centers was asked to address in their presentation the above three topics and to highlighttheir unique processing approaches and future plans.The technical program of the workshop was coordinated by Jan Kouba of EMR (NRCan) inconsultation with J.F. Zumberge of the Central Bureau at JPL and members of the IGS OversightCommittee. Danielle Williams looked after administrative matters and logistics; the Surveys,Mapping and Remote Sensing Sector of the Department of Natural Resources provided additionalfinancial support.These proceedings contain the final workshop agenda, the list of the participants, revised versionsof the three position papers, summary reports on discussions as prepared by the session facilitatorsand overall workshop conclusions and recommendations. Copies of the presentations by the IGSAnalysis Centers and other were made available to the participants during the workshop and thusare not included here. Jan Kouba and R. Ferland have edited and arranged the material accordingto the workshop agenda to preserve it for the IGS records and for future reference. The Appendixprovides IGS Resources Information prepared by the Central Bureau.I would like to congratulate the IGS, the workshop organizers and all of the participants for a jobwell done. The technical expertise and collaborative spirit which prevailed during the workshop isreflected in its recommendations and this holds great promise for the future of the IGS. We arelooking forward to similar participation in the implementation of the operational IGS starting in1994.J.D. BoalDirector and Dominion GeodesistGeodetic Survey Division, SMRSS, NRCan.
TABLE OF CONTENTS.FINAL AGENDA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1LIST OF PARTICIPANTS . . . . . . . . . . . . . . . . . ., . . . ..$$. . . . . . . . . . . . . . . . . . . . . . 4.SESSION 1SESSION 2SESSION 3SESSION 4SESSION 5(~ocessing standards, repofis &formats) . . . . . . . . . . . . . . . . . . . . 5PAPER: IGS Processing Center standard report requirements andproduct formats; James F. Zumberge, Clyde C. Goad . . . . . . . . . 6SUMMARY OF SESSION 1 ..$$ $..... . . . . . . . . . . . . . . . . . . . . 17(IGS orbit products) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19PAPER: Combining the orbits of the IGS Processing Centers;Gerhard Beutler, Jan Kouba, Tim Springer . . . . . . . . . . . . . . . . . . 20SUMMARY OF SESSION 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57(lGSprocessing standmds) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59SUMMARY OF SESSION 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60(Integration ofregional station clusters) . . . . . . . . . . . . . . . . . . . 61PAPER: Regional Clusters and Distributed Processing; GeoffreyBlewitt, Yehuda Bock, Gerd Gendt . . . . . . . . . . . . . . . . . . . . . . . . 62SUMMARY OF SESSION 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . 92(IGSapplications) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93PAPER: Long term behaviour of polar motion series relative to theIERS/CB series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ~SUMMARY OF SESSION 5 .,, ,.$$$. . . . . . . . . . . . . . . . . . . .CONCLUSIONWRECOMMENDATIONS . . . . . . . . . . . . . . . . . . . . . . . . ...99APPENDIX (IGSresource information) . . . . . . . . . . . . . . . . . . . . . . . . . . ...103
Page 1: ●INTERNATIONAL ASSOCIATION OF GEO
Page 5 and 6: 13:30 NGS14:00 S1014:30 EMR15:00 CO
Page 7 and 8: LIST OF PARTICIPANTS:Prof. Gerhard
Page 10 and 11: Table 1. Current IGS Analysis Cente
Page 12 and 13: The first field identifies the reco
Page 14 and 15: Summary InformationThe third produc
Page 16 and 17: From Figure 1 we find that there ar
Page 18: to define a reference clock in thei
Page 22 and 23: SESSION 2(IGS orbit products)
Page 24 and 25: 1. introductionThe main objectives
Page 26 and 27: ecause of the above averaging. This
Page 28 and 29: RMS per center (m)o 0 0 0 0 0 oA0Iv
Page 30: Scale (ppb)I I I I I 11+-b~ul0Amo&I
Page 33 and 34: and NGS. Note that the day to day v
Page 35 and 36: Rotation around X-axis (mas)1&0 0o
Page 37 and 38: discussed in Section 3 are here see
Page 39 and 40: -----------------------------------
Page 41 and 42: Residuals in Meters1 1 1 1 1 1 1=%m
Page 43 and 44: Residuals inMeters11111cnficJJw-o A
Page 45 and 46: I I I—Residuals in Meters..—.
Page 47 and 48: 1111ResidualsMeters,—{44
Page 49 and 50: Residuals in MetersI I I II I I IIc
Page 51 and 52: Rms in MetersI 1 ! I 1 10 n0 a0n.ff
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IGS- and the COM-sets, but that the
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Table 4.1 N.A. Baseline Repeatabili
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..Figure 5.1:Clock solutions for FA
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specifically the preanalysis can be
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discussion, a question as to whethe
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SUMMARY OF SESSION 3This Session be
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IGS POSITION PAPER, IGS ANALYSIS CE
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and Earth orientation parameters (E
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LbPIERS and IGSCentral Bureausand D
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@ IGS will develop instructions, an
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2.2 Analysis Center System DesignFi
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applied to the solution in order to
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..standard deviations. This is conv
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known, the two solutions will be ad
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errors, and can therefore be used a
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International Terrestrial Reference
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Thus, there is the potential of fee
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90” 100” 110” 120” 130” 1
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adiation parameters for each satell
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Bock, Y., R.I. Abbot, C.C. Counselm
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SUMMARY OF SESSION 4This session st
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INTERNATIONAL EARTH ROTATION SERVIC
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x- differences with IERS0.001”I I
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SUMMARY OF SESSION 5In the last ses
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1) I(X3 PROCESSING/REPORTS/FORMATSS
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IGS should foster and encourage reg
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..INTERNATIONAL GPS SERVICE FORGEOD
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ortL.s.4
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1234567a91011121314IsIt17ItIs2C2122
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. Ruth Neilan16S Central BureauJet
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ON1T.>● Jim ZumbergeJet Propulsio
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PROPOSED ORGANIZATION OF THE INTERN
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