From AC Thu Oct 5 09:52:56 1995 From: AC (AC) Date: Thu, 5 Oct 1995 9:52:56 PDT Subject: [IGSMAIL-1082] Wk 0813-816 IGS Final Orb Message-ID: ****************************************************************************** IGS Electronic Mail Thu Oct 5 9:52:56 PDT 1995 Message Number 1082 ****************************************************************************** Author: AC Coordinator Subject: Wk 0813-816 IGS Final Orb ******************************************************************************* IGS Final orbits/clocks completed and put onto CDDIS (Weeks 813 - 816) (Aug 06 - Sep 02, 1995) ******************************************************************************* The IGS Rapid Orbits for this period 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 (IGS mean pole 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. 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 an objective clock weighting, provided that the non-SA satellites are representative 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 a 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: IGS08130-6.SP3 IGS GPS orbit/clock files for days 0-6, week 0813 IGS08140-6.SP3 IGS GPS orbit/clock files for days 0-6, week 0814 IGS08150-6.SP3 IGS GPS orbit/clock files for days 0-6, week 0815 IGS08160-6.SP3 IGS GPS orbit/clock files for days 0-6, week 0816 IGS08137.ERP EOP associated with the above orbits (Bull. B aligned to ITRF) IGS08147.ERP EOP associated with the above orbits (Bull. B aligned to ITRF) IGS08157.ERP EOP associated with the above orbits (Bull. B aligned to ITRF) IGS08167.ERP EOP associated with the above orbits (Bull. B aligned to ITRF) IGS08137.SUM Complete summary/statistics report IGS08147.SUM Complete summary/statistics report IGS08157.SUM Complete summary/statistics report IGS08167.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) IGR08130-6.SP3 Rapid service orbits/clocks for days 0-6, week 0813 IGR08140-6.SP3 Rapid service orbits/clocks for days 0-6, week 0814 IGR08150-6.SP3 Rapid service orbits/clocks for days 0-6, week 0815 IGR08160-6.SP3 Rapid service orbits/clocks for days 0-6, week 0816 IGR08137.ERP IGS Mean EOP associated with the above orbits IGR08147.ERP IGS Mean EOP associated with the above orbits IGR08157.ERP IGS Mean EOP associated with the above orbits IGR08167.ERP IGS Mean EOP associated with the above orbits IGR08137.SUM Rapid service complete summary/statistic report IGR08147.SUM Rapid service complete summary/statistic report IGR08157.SUM Rapid service complete summary/statistic report IGR08167.SUM Rapid service complete summary/statistic report ***************************************************************************** REMARKS/CORRECTIONS: ************* NOTE: *************************** Since Wk 803 the IGS Rapid combinations are performed directly in ITRF frame, without any EOP alignments. The associated erp files (IGR0WWW7.erp) contain weighted averages of all submitted erp solutions given at 12h UT each day (using the orbit weights), augmented with the current IERS Bull.A UT1-UTC. Consequently, since Wk 803, the IGR erp contains 7 daily EOP values at 12h UT, unlike the Final orbit erp (and the Rapid orbit erp prior Wk 803) which contain 9 daily IERS EOP values at 0h UT to facilitate accurate interpolation for the whole week period. *********************************************** The following table shows the average statistics of the Final Orbit/clock combination for the current period (Wks 0813-0812). Start: 95 Aug 06 / wk813 End: 95 Sep 02 / wk816 STA DX DY DZ RX RY RZ SCL RMS WRMS LaRMS RMSc Days ---------------------------------------------------------------------------- cod 61 0.00 0.03 -0.02 -0.45 -0.23 0.00 0.1 8 7 8 76.9 28 0.01 0.01 0.01 0.18 0.25 0.17 0.1 emr 28 0.01 -0.02 0.00 -0.07 -0.08 0.23 -0.1 8 8 13 0.9 28 0.01 0.01 0.01 0.23 0.32 0.13 0.1 esa 49 0.00 -0.01 -0.03 0.37 -0.04 -0.20 0.1 15 14 14 32.8 28 0.01 0.01 0.01 0.17 0.31 0.28 0.1 gfz 47 -0.03 -0.01 0.00 -0.20 0.07 -0.17 -0.2 9 9 13 6.5 28 0.01 0.00 0.01 0.16 0.21 0.18 0.1 jpl 34 0.01 0.04 0.00 -0.44 0.03 0.10 0.2 8 8 8 0.8 28 0.01 0.01 0.01 0.19 0.28 0.09 0.1 ngs 41 0.01 -0.01 0.00 -0.31 -0.13 -0.22 -0.1 12 11 15 2192.2 28 0.01 0.01 0.01 0.30 0.41 0.24 0.1 sio 33 0.00 -0.05 0.03 -0.26 -0.25 0.62 0.014181 9521 14 0.0 28 0.01 0.01 0.03 0.20 0.29 1.45 0.1 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 for the current year (Wks 0782-0816). Start: 95 Jan 01 / wk782 End: 95 Sep 02 / wk816 STA DX DY DZ RX RY RZ SCL RMS WRMS LaRMS RMSc Days ---------------------------------------------------------------------------- cod 55 0.00 0.01 0.00 -0.45 -0.01 0.06 0.0 10 9 12 4542.0 245 0.01 0.02 0.01 0.23 0.30 0.21 0.1 emr 26 0.01 -0.02 0.00 -0.14 -0.06 0.13 -0.1 10 10 15 1.0 245 0.01 0.01 0.01 0.36 0.32 0.19 0.2 esa 37 0.00 -0.01 -0.02 0.27 0.17 -0.04 0.1 476 15 19 25.9 245 0.01 0.01 0.01 0.42 0.41 0.35 0.2 gfz 43 -0.03 -0.01 0.00 -0.24 0.16 -0.22 -0.3 46 46 15 13.7 245 0.01 0.01 0.01 0.19 0.25 0.18 0.1 jpl 33 0.01 0.05 0.01 -0.52 0.07 0.11 0.1 10 10 10 0.9 245 0.01 0.01 0.01 0.25 0.29 0.15 0.1 ngs 37 0.01 -0.03 -0.01 -0.35 0.29 -0.06 0.5 20 20 21 7764.3 245 0.02 0.02 0.02 0.39 0.42 0.38 0.4 sio 34 0.01 -0.06 0.03 0.16 -0.23 -0.33 0.1 4794 3219 22 0.0 245 0.02 0.03 0.07 0.58 0.61 2.15 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 ]