[IGSMAIL-1018] Wk 0799-802 IGS Final Orb.
AC
AC
Mon Jul 24 11:31:37 PDT 1995
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IGS Electronic Mail Mon Jul 24 11:31:37 PDT 1995 Message Number 1018
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Author: AC Coordinator
Subject: Wk 0799-802 IGS Final Orb.
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IGS Final orbits/clocks completed and put onto CDDIS (Weeks 799 - 802)
(Apr. 30 - May 27, 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 orientation difference (Bull.A and 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, 28). 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:
IGS07990-6.SP3 IGS GPS orbit/clock files for days 0-6, week 0799
IGS08000-6.SP3 IGS GPS orbit/clock files for days 0-6, week 0800
IGS08010-6.SP3 IGS GPS orbit/clock files for days 0-6, week 0801
IGS08020-6.SP3 IGS GPS orbit/clock files for days 0-6, week 0802
IGS07997.ERP EOP associated with the above orbits (Bull. B aligned to ITRF)
IGS08007.ERP EOP associated with the above orbits (Bull. B aligned to ITRF)
IGS08017.ERP EOP associated with the above orbits (Bull. B aligned to ITRF)
IGS08027.ERP EOP associated with the above orbits (Bull. B aligned to ITRF)
IGS07997.SUM Complete summary/statistics report
IGS08007.SUM Complete summary/statistics report
IGS08017.SUM Complete summary/statistics report
IGS08027.SUM Complete summary/statistics report
The old Rapid Orbit files have been renamed (on CDDIS) to:
(Note this is temporary, based on discussions with ACs and GB and may be
changed)
IGR07990-6.SP3 Rapid service orbits/clocks for days 0-6, week 0799
IGR08000-6.SP3 Rapid service orbits/clocks for days 0-6, week 0800
IGR08010-6.SP3 Rapid service orbits/clocks for days 0-6, week 0801
IGR08020-6.SP3 Rapid service orbits/clocks for days 0-6, week 0802
IGR07997.ERP Rapid service EOP associated with the above orbits (Bull A)
IGR08007.ERP Rapid service EOP associated with the above orbits (Bull A)
IGR08017.ERP Rapid service EOP associated with the above orbits (Bull A)
IGR08027.ERP Rapid service EOP associated with the above orbits (Bull A)
IGR07997.SUM Rapid service complete summary/statistic report
IGR08007.SUM Rapid service complete summary/statistic report
IGR08017.SUM Rapid service complete summary/statistic report
IGR08027.SUM Rapid service complete summary/statistic report
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REMARKS/CORRECTIONS:
The following table shows the average statistics of the Final Orbit/clock
combination for the current period (Wks 0799-0802).
Start: 95 Apr 30/ wk799
End: 95 Apr 29/ wk802
STA DX DY DZ RX RY RZ SCL RMS WRMS LaRMS RMSc Days
----------------------------------------------------------------------------
cod 57 0.00 0.01 0.01 -0.52 -0.17 0.12 0.0 10 9 11 11672.1 28
0.01 0.01 0.01 0.15 0.36 0.21 0.1
emr 27 0.01 -0.01 -0.01 -0.39 -0.21 0.19 -0.1 11 11 14 0.9 28
0.01 0.01 0.01 0.31 0.35 0.26 0.2
esa 36 0.00 0.00 -0.03 0.56 0.11 0.19 0.1 26 16 26 43.3 28
0.01 0.01 0.01 0.22 0.47 0.29 0.2
gfz 43 -0.04 0.00 0.00 -0.29 -0.03 -0.34 -0.3 11 11 15 32.6 28
0.01 0.01 0.01 0.24 0.34 0.18 0.1
jpl 34 0.01 0.05 0.01 -0.50 -0.15 0.11 0.1 10 10 9 0.8 28
0.01 0.01 0.01 0.25 0.32 0.15 0.2
ngs 37 0.01 -0.03 -0.02 -0.18 0.04 -0.13 0.4 19 17 19 9572.1 28
0.02 0.02 0.01 0.41 0.46 0.45 0.2
sio 33 0.01 -0.08 0.02 0.09 -0.78 -0.22 0.1 21 20 23 0.0 28
0.01 0.02 0.05 0.43 0.50 0.77 0.2
Units: m - DX, DY, DZ, RMS, WRMS, LaRMS (Long arc orbit RMS)
mas - RX,RY,RZ
ppb - SCL
ns - RMSc (sv clock)
The following table shows the average statistics of the Final Orbit/clock
combination since Jan. 1/95 (Wks 0782-0802).
Start: 95 Jan 01/ wk782
End: 95 May 27/ wk802
STA DX DY DZ RX RY RZ SCL RMS WRMS LaRMS RMSc Days
----------------------------------------------------------------------------
cod 52 0.00 0.00 0.00 -0.45 0.08 0.12 0.0 11 9 12 5796.2 147
0.01 0.01 0.01 0.25 0.32 0.22 0.1
emr 25 0.01 -0.02 0.00 -0.15 -0.07 0.07 -0.2 11 11 15 1.0 147
0.01 0.01 0.01 0.39 0.34 0.20 0.2
esa 33 0.00 -0.01 -0.03 0.18 0.20 -0.02 0.1 20 15 20 20.0 147
0.01 0.01 0.01 0.47 0.46 0.35 0.2
gfz 41 -0.04 -0.01 0.00 -0.28 0.15 -0.20 -0.3 11 11 15 15.6 147
0.01 0.01 0.01 0.20 0.29 0.19 0.2
jpl 33 0.01 0.05 0.00 -0.53 0.06 0.09 0.1 10 10 10 1.0 147
0.01 0.01 0.01 0.25 0.32 0.16 0.2
ngs 35 0.02 -0.02 -0.01 -0.37 0.38 -0.02 0.6 21 21 22 9232.9 147
0.02 0.02 0.02 0.38 0.42 0.39 0.3
sio 34 0.02 -0.05 0.04 0.20 -0.21 -0.61 0.1 23 20 23 0.0 147
0.02 0.03 0.08 0.62 0.71 1.84 0.3
Units: m - DX, DY, DZ, RMS, WRMS, LaRMS (Long arc orbit RMS)
mas - RX,RY,RZ
ppb - SCL
ns - RMSc (sv clock)
[Mailed From: Jan Kouba <kouba at geod.emr.ca>]
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