IGS Analysis Center Workshop - IGS - NASA

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Table 4.2 European Baseline Repeatability Sigmas (Jan 17-30, 1993)North(mm)East(mm)up(mm)Length(ppb)#KOSG-WETT (602km)IGSCOMCODEMRGFZ5.84.74.67.16.44.34.73.65.74.917.014.715.220.816.05.35.35.96.15.81414141414KOSG-MADR (1512km)lGSCOMCODEMRGFZ6.67.84.78.99.38.77.56.39.310.712.912.812.620.314,53.02.93.13.33.31414141414KOSG-TROM (2054km)IGSCOMCODEMRGFZ9.910.08.413.712.719.118.213.226.724.421.119.718.025.124.73.64.53.05.16.013131313135. SATELLITE CLOCK COMBINATION CONSIDERATIONSThe satellite clock offsets along with satellite orbits are required for all positioning applications.Furthermore satellite orbit and clock errors are usually highly correlated so it makes sense toinclude them in the orbit products as well. Most geodetic applications do not require very precisesatellite clocks, a precision of a few microseconds is sufficient to align orbits and observation data.Single station navigation and precise time transfers, on the other hand, need the utmost accuracyfor the satellite clocks as the satellite clock and orbit errors map directly into the results.Precise and optimal clock estimation from both pseudorange and phase data necessitates theundifferenced approach to the GPS data analysis. The usual double differencing data treatmentnearly eliminates, by design, both station and satellite clock errors. Thus, for double differencingan additional step utilizing pseudoranges is required. Such clock estimation is suboptimal as phasedata and other parameters (e.g. estimated tropospheric delays) are not available or used in thisprocess. Nevertheless such clock solutions would still be useful in particular when precisepseudorange observations are available and used along with precise orbits. Currently only one IGSCenter (EMR) estimates both satellite and station clocks and submits the satellite clock solutions53
..Figure 5.1:Clock solutions for FAIR Hydrogen Maser (HM) clock with respect to ALGO HMclocko.0.-o.-0.:-0.:-0.0 10 2030Sep 22, 1993 (hours)
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●INTERNATIONAL ASSOCIATION OF GEO
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TABLE OF CONTENTS.FINAL AGENDA . .
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
Page 53 and 54: IGS- and the COM-sets, but that the
Page 55: Table 4.1 N.A. Baseline Repeatabili
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 and 104: 1) I(X3 PROCESSING/REPORTS/FORMATSS
Page 105 and 106: 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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. 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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