[IGSMAIL-0930] Wk 0786-789 IGS Final Orb.
AC
AC
Mon Apr 10 11:39:47 PDT 1995
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IGS Electronic Mail Mon Apr 10 11:39:47 PDT 1995 Message Number 0930
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Author: AC Coordinator
Subject: Wk 0786-789 IGS Final Orb.
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IGS Final orbits/clocks completed and put onto CDDIS (Weeks 786 - 789)
(Jan. 29 - Feb. 25, 1995)
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According to the recommendations of the Analysis Centre Workshop the IGS
Rapid Orbits were recomputed using up to date orbits and the final EOP values
of Bulletin B, published by IERS. ( Daily values, page 2 of Bull. B )
The EOP were corrected for the difference between the IERS pole series
and ITRF as published in the IERS 1993 Annual Report (p. II-19, Table II-3),
so both the IGS orbits and the associated ERP files are consistent with ITRF93
(current epoch).
We have downloaded all the submitted ephemeris and ERP files from CDDIS before
the final orbit/clock combination to ensure that the sets are complete and up
to date. In the final combination we have largely followed the actions taken
during the Rapid orbit generation and since there were very few orbit
resubmissions, both the IGS Rapid and Final orbits are virtually the same except
for the the orientation difference (the current Bull.A and the final Bull.B).
Orbit evaluation are also nearly the same, since we used centre specific ERP
in the long arc evaluations. For more information see the corresponding
summary files on CDDIS.
Starting with the GPS week 742 a new clock combination scheme was put in place
for the final orbit/clock combinations. The clock solution alignment and centre
clock weight assignment are based on non SA broadcast satellite corrections
only (PRN12, 15, 20). This should result in more realistic and objective clock
weighting than employed before, provided that the non SA satellites are
representatives of centre clock solution quality. Starting with the GPS
week 756 the new IGS erp format (see IGSMAIL# 662) is used by all Analysis
Centres and for the IGS erp files. ERP rates, whenever given, are also utilized
in both orbit combination and the long arc evaluation.
PRODUCTS GENERATED:
The resulting final IGS ephemeris and clocks are in daily files in the SP3
format. The sat. orb. accuracy codes displayed in the headers are based on
weighted RMS for each satellite. Note that each file contains all the submitted
satellites. If satellite or centre had to be excluded from the combination it
is noted in the summary file along with the reason for doing so.
The IGS FINAL ORBIT files generated and uploaded into CDDIS @ NASA/GSFC are:
IGS07860-6.SP3 IGS GPS orbit/clock files for days 0-6, week 0786
IGS07870-6.SP3 IGS GPS orbit/clock files for days 0-6, week 0787
IGS07880-6.SP3 IGS GPS orbit/clock files for days 0-6, week 0788
IGS07890-6.SP3 IGS GPS orbit/clock files for days 0-6, week 0789
IGS07867.ERP EOP associated with the above orbits (Bull. B aligned to ITRF)
IGS07877.ERP EOP associated with the above orbits (Bull. B aligned to ITRF)
IGS07887.ERP EOP associated with the above orbits (Bull. B aligned to ITRF)
IGS07897.ERP EOP associated with the above orbits (Bull. B aligned to ITRF)
IGS07867.SUM Complete summary/statistics report
IGS07877.SUM Complete summary/statistics report
IGS07887.SUM Complete summary/statistics report
IGS07897.SUM Complete summary/statistics report
The old Rapid Orbit files have been renamed (on CDDIS) to:
(Note this is temporary, based on discussions with AC and GB and may be
changed )
IGR07860-6.SP3 Rapid service orbits/clocks for days 0-6, week 0786
IGR07870-6.SP3 Rapid service orbits/clocks for days 0-6, week 0787
IGR07880-6.SP3 Rapid service orbits/clocks for days 0-6, week 0788
IGR07890-6.SP3 Rapid service orbits/clocks for days 0-6, week 0789
IGR07867.ERP Rapid service EOP associated with the above orbits (Bull A)
IGR07877.ERP Rapid service EOP associated with the above orbits (Bull A)
IGR07887.ERP Rapid service EOP associated with the above orbits (Bull A)
IGR07897.ERP Rapid service EOP associated with the above orbits (Bull A)
IGR07867.SUM Rapid service complete summary/statistic report
IGR07877.SUM Rapid service complete summary/statistic report
IGR07887.SUM Rapid service complete summary/statistic report
IGR07897.SUM Rapid service complete summary/statistic report
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REMARKS/CORRECTIONS:
For this and future Final combinations we will be including here average
statistics for the current four (five) week Final Orbit/clock combination.
For completeness the average statistcs table below includes all the Wks in 1995,
(i.e. 782-789):
Start: 95 Jan / wk782 UNITS: m - DX,DY<DZ,RMS,WRMS,LaRMS(Long arc orbit RMS)
End: 95 Feb / wk789 mas - RX,RY,RZ; ppb - SCL; ns - RMSc(sv clock)
DX DY DZ RX RY RZ SCL RMS WRMS LaRMS RMSc Days
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cod 0.00 0.00 0.00 -0.31 0.08 0.03 0.0 11 10 12 194.5 56
0.01 0.01 0.01 0.28 0.31 0.22 0.1
emr 0.01 -0.02 -0.02 0.09 -0.08 0.04 -0.3 12 12 15 1.0 56
0.01 0.01 0.02 0.44 0.38 0.18 0.2
esa 0.00 -0.01 -0.02 -0.19 0.06 -0.06 0.0 18 15 18 3.8 56
0.01 0.01 0.02 0.47 0.50 0.38 0.2
gfz -0.03 -0.01 0.00 -0.33 0.12 -0.16 -0.3 12 11 15 6.6 56
0.01 0.01 0.01 0.23 0.25 0.17 0.2
jpl 0.00 0.05 -0.01 -0.45 0.07 0.03 0.2 10 10 10 1.0 56
0.01 0.01 0.01 0.27 0.33 0.14 0.1
ngs 0.02 -0.03 -0.01 -0.35 0.35 0.18 0.7 22 22 23 5547.2 56
0.02 0.02 0.02 0.37 0.34 0.35 0.3
sio 0.03 -0.05 0.09 0.14 0.30 -1.20 0.0 24 21 24 0.0 56
0.02 0.03 0.10 0.51 0.64 2.65 0.3
[Mailed From: Jan Kouba <kouba at geod.emr.ca>]
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