IGS Analysis Center Workshop - IGS - NASA

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within a few monthsThe IGS orbit products will be based, at least in the initial stages, on the weighted averagecombination method as outlined in the position paper and the second method, the orbital dynamicsmethod, will be used for preanalysis and evaluation using multi-day arcs. Individual Center orbitseries will continue to be archived and made available by IGS.The Analysis Center coordinator responsible for generation of the IGS combined orbit isencouraged to provide useful and timely feedback to contributing Centers as well as to stimulatefurther research at other Centers to encourage future improvements.3) IGS PROCESSING STANDARDSFirst task is to gather information on Analysis Center models, estimation strategy, coordinates, etc.CB (Blewitt and Zumberge) will develop an electronic questionnaire to be filled out by AnalysisCenters. Completed questionnaires will be made available to all Centers, IGN/IERS, and will beavailable cm the IGS Information system being implemented at the Central Bureau. This way thedifferences and changes of estimation strategies and how this relates to solution differences will besystematically documented.All Centers agreed in principle to adopt the same set of fiducial coordinates for purposes of orbit/EOP products. The proposed list of stations is as above, in Session 1.It is recommended that the January orbit test reprocessing (weeks 680 and 681) be completed bythe Centers which have not done so yet, or which want to reprocess it again with improved(changed) orbit estimation strategies. For this reprocessing, the IGS Mail message 263 will be thestandard for monument coordinates and antenna heights.4) INTEGRATION OF REGIONAL STATION CLUSTERSUsing the IGS (combined) orbits is the simplest form of distributed processing thus should beimplemented immediately to accommodate various regional processing.Distributed processing should imply only minimal computational increase for the IGS ‘AnalysisCenter. Reduced normals (’fiducial-free’) contribution from IGS Analysis Centers will benecessary in the future distributed processing and all Centers are encouraged to develop thiscapability as soon as possibleAdditional products, such as tropospheric calibration delays may also be useful for distributedprocessing also more research is needed for distributed processing strategies (e.g. the effect andmitigation of data overlaps (using data more than once)).101
IGS should foster and encourage regional analysis e.g. through Associate Analysis Centermembership, designating a Governing Board representation, recommendations and guidelines,research & publications, etc.102
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●INTERNATIONAL ASSOCIATION OF GEO
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TABLE OF CONTENTS.FINAL AGENDA . .
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13:30 NGS14:00 S1014:30 EMR15:00 CO
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LIST OF PARTICIPANTS:Prof. Gerhard
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Table 1. Current IGS Analysis Cente
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The first field identifies the reco
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Summary InformationThe third produc
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From Figure 1 we find that there ar
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to define a reference clock in thei
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SESSION 2(IGS orbit products)
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1. introductionThe main objectives
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ecause of the above averaging. This
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RMS per center (m)o 0 0 0 0 0 oA0Iv
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Scale (ppb)I I I I I 11+-b~ul0Amo&I
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and NGS. Note that the day to day v
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Rotation around X-axis (mas)1&0 0o
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discussed in Section 3 are here see
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-----------------------------------
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Residuals in Meters1 1 1 1 1 1 1=%m
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Residuals inMeters11111cnficJJw-o A
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I I I—Residuals in Meters..—.
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1111ResidualsMeters,—{44
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Residuals in MetersI I I II I I IIc
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Rms in MetersI 1 ! I 1 10 n0 a0n.ff
Page 53 and 54: IGS- and the COM-sets, but that the
Page 55 and 56: Table 4.1 N.A. Baseline Repeatabili
Page 57 and 58: ..Figure 5.1:Clock solutions for FA
Page 59 and 60: specifically the preanalysis can be
Page 61 and 62: discussion, a question as to whethe
Page 63 and 64: SUMMARY OF SESSION 3This Session be
Page 65 and 66: IGS POSITION PAPER, IGS ANALYSIS CE
Page 67 and 68: and Earth orientation parameters (E
Page 69 and 70: LbPIERS and IGSCentral Bureausand D
Page 71 and 72: @ IGS will develop instructions, an
Page 73: 2.2 Analysis Center System DesignFi
Page 76 and 77: applied to the solution in order to
Page 78 and 79: ..standard deviations. This is conv
Page 80 and 81: known, the two solutions will be ad
Page 82 and 83: errors, and can therefore be used a
Page 84 and 85: International Terrestrial Reference
Page 86 and 87: Thus, there is the potential of fee
Page 88 and 89: 90” 100” 110” 120” 130” 1
Page 91 and 92: adiation parameters for each satell
Page 93 and 94: Bock, Y., R.I. Abbot, C.C. Counselm
Page 95 and 96: SUMMARY OF SESSION 4This session st
Page 97 and 98: INTERNATIONAL EARTH ROTATION SERVIC
Page 99 and 100: x- differences with IERS0.001”I I
Page 101 and 102: SUMMARY OF SESSION 5In the last ses
Page 103: 1) I(X3 PROCESSING/REPORTS/FORMATSS
Page 107 and 108: ..INTERNATIONAL GPS SERVICE FORGEOD
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Page 111 and 112: 1234567a91011121314IsIt17ItIs2C2122
Page 113 and 114: . Ruth Neilan16S Central BureauJet
Page 115 and 116: ON1T.>● Jim ZumbergeJet Propulsio
Page 117: PROPOSED ORGANIZATION OF THE INTERN
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IGS Analysis Center Workshop - IGS - NASA

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