From J.F. Thu Nov 5 18:05:45 1992 From: J.F. (J.F.) Date: 5 NOV 1992 18:05:45 Subject: [IGSMAIL-129] JPL analysis report Message-ID: *********************************************************************** IGS Electronic Mail 5-NOV-1992 18:05:45 Message Number 129 *********************************************************************** ============================================================================== THIS FILE CONTAINS 2 MESSAGES ============================================================================== ^From: J.F. Zumberge Subject: JPL analysis report -------------------- Submitted by D C Jefferson, J F Zumberge, G Blewitt, M B Heflin, F H Webb all at the Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109. The following files have been posted on BODHI (for access to BODHI contact starr at logos.jpl.nasa.gov): ______________________________________________________________________________ filename contents ______________________________________________________________________________ jpl06677.sum This text file. jpl06677.erp Earth rotation parameters for GPS week 667. jpl06677.sp1 GPS ephemerides for GPS week 667, sp1 format. jpl06677.sp3 " " " " " " , sp3 " . ______________________________________________________________________________ A-S testing occurred during "17 Oct 92 0100 UT to 19 Oct 92 1000 UT" and "24 Oct 92 0100 UT to 26 Oct 92 1000 UT", according to the file pub/gps/gpstd.txt obtained from tycho.usno.navy.mil. Results for Sunday, Oct 18, and Saturday, Oct 24, are not included in this submission. The results for Monday, Oct 19, exclude data from Block-II satellites acquired when operating in cross-correlated mode. Also, according to the file pub/gps/gpsn4.txt, GPS25 was scheduled unusable for up to 12 hours on Oct 22 (day 296), beginning at 22:00:00. Our analysis confirms that the behaviour of this satellite is poorly modeled on the FOLLOWING day, as most of this 12 hour period occurs on Oct 23 (day 297). The corresponding data have thus been de-weighted. Beginning this week, we analyze data from GPS27 without de-weighting. As our orbit comparison tables indicate, our model reasonably represents the behavior of this satellite. WARNING: GPS25 is not well modeled on Friday, Oct 23. We recommend using the broadcast ephemeris for that satellite and day. JPL LODR TABLE GPS week 667 (1992 Oct 19 - Oct 23) MJD LODR +/- (ms/day) 48914.5 2.65 0.10 48915.5 2.79 0.06 48916.5 2.04 0.06 48917.5 2.14 0.06 48918.5 2.77 0.06 END LODR TABLE NOTE: In the following table, UT1R-UTC are the assumed nominal values from IERS Bulletin-B predicts; estimated LODR values are given in the previous table. See IGS Mail Message 97 for details. JPL UTPM TABLE GPS week 667 (1992 Oct 19 - Oct 23) MJD X Y UT1R-UTC XSIG YSIG UTSIG RMS XYC XUC YUC STA SAT PASS '' '' sec '' '' sec 48914.5 .10429 .49425 .24721 .00049 .00054 .00000 .0 -.08 .00 .00 25 19 0 48915.5 .10516 .49385 .24499 .00018 .00019 .00000 .0 -.07 .00 .00 25 19 0 48916.5 .10789 .49228 .24276 .00019 .00023 .00000 .0 -.13 .00 .00 25 19 0 48917.5 .11006 .49093 .24053 .00018 .00019 .00000 .0 -.04 .00 .00 26 19 0 48918.5 .11276 .49020 .23829 .00018 .00020 .00000 .0 -.05 .00 .00 26 19 0 END UTPM TABLE The following table indicates the "3-dimensional orbit repeatability", as defined in IGS Mail Message 37, for GPS week 667: JPL ORBIT REPEATABILITY TABLE GPS week 667 (1992 Oct 19 - Oct 23) 92 10 19 92 10 20 92 10 21 92 10 22 92 10 23 prn rms (m) 2 0.3 0.52 0.52 0.48 0.5 3 0.9 0.84 0.74 0.53 0.3 11 0.2 0.27 0.51 0.35 0.5 12 0.3 0.33 0.58 0.35 0.3 13 0.5 0.44 0.39 0.27 0.3 14 0.5 0.52 0.42 0.46 0.4 15 0.5 0.37 0.32 0.33 0.5 16 0.6 0.61 0.64 0.98 0.7 17 0.5 0.40 0.41 0.48 1.2 18 0.4 0.61 0.88 0.61 0.4 19 0.9 0.59 0.34 0.76 0.9 20 0.6 0.30 0.17 0.45 0.2 21 0.3 0.49 0.21 0.22 0.4 23 0.2 0.40 0.28 0.34 0.6 24 1.0 0.55 0.65 0.62 0.3 25 0.3 0.25 0.27 13.19 37.8 26 0.4 1.27 1.69 1.23 0.8 27 0.5 0.39 0.54 0.72 0.4 28 0.7 0.53 0.69 0.33 0.5 END ORBIT REPEATABILITY TABLE As described in IGS Mail Message 37, the following table compares the JPL precise ephemerides with those from the broadcast ephemeris: JPL COMPARISON OF BROADCAST NAVIGATION MESSAGE WITH PRECISE EPHEMERIDES 92 10 19 92 10 20 92 10 21 92 10 22 92 10 23 prn rms (m) 2 7.8 9.2 8.6 6.1 4.6 3 13.3 14.6 15.2 14.2 14.8 11 6.7 5.3 4.2 5.9 5.8 12 20.3 10.2 8.4 4.5 4.1 13 4.6 6.8 5.5 4.0 2.6 14 5.8 6.4 5.9 5.7 6.1 15 2.7 3.9 4.5 31.3 4.3 16 5.8 6.2 6.5 5.7 4.8 17 5.7 7.7 10.6 5.1 3.5 18 7.8 9.0 6.9 6.9 8.7 19 4.1 4.2 4.0 3.7 3.6 20 5.7 5.2 5.0 5.1 6.1 21 5.8 4.0 4.4 5.9 3.7 23 9.7 4.2 4.9 3.9 7.4 24 11.8 12.1 10.6 8.2 5.5 25 10.3 9.6 8.6 8.3 31.6 26 14.0 21.3 19.6 44.4 23.0 27 15.2 13.7 15.8 18.2 15.9 28 3.5 2.8 2.8 3.6 3.7 END COMPARISON OF BROADCAST NAVIGATION MESSAGE WITH PRECISE EPHEMERIDES The following table, as explained in IGS Mail Message 91, indicates which tracking sites were used in this week's analysis: JPL GROUND STATION INCLUSION TABLE GPS week 667 (1992 Oct 19 - Oct 23) 92 10 19 92 10 20 92 10 21 92 10 22 92 10 23 ALBH X X X X X ALGO* X X X X X FAIR* X X X X X GOLD X X X X X HART* X X X X X HERS X X X X X JPLM X X X X X KOSG X X X X X MADR* X X X X X MASP X X X X X MATE X X X X X MCMU X X X X X METS X X X X X NYAL X X X X X ONSA X X X X X PAMA X X X X X PENT X X X X X SANT* X X X X X STJO X X X X X TAIW X X X X X TROM* X X X X X USUD X X X X X WETT X X X X X YAR1* X X X X X YELL X X X X X _______________________ *Indicates fiducial site. END GROUND STATION INCLUSION TABLE ============================================================================== ^From: Ch. Reigber Subject: Report for GPS Week 666 (Days 285-291) from GFZ =============================================== This report is generated by the GeoForschungsZentrum Potsdam (GFZ) on a weekly basis for the International GPS Geodynamics Service (IGS). PRODUCT SUMMARY GFZ0666*.EPH: GPS ephemerides for GPS Week 666 (SP3 format, pos. and vel.) * represents: 2 for Tuesday, .... , 5 for Friday GFZ06667.ERP: Earth rotation parameter (UT1 corrections are not included) GFZ06667.CLK: ST and SV clock parameters of each observation epoch (the maser-based clock at Fairbanks is taken as reference clock) GFZ06667.SUM: Summary file for reporting week The above specified products are available at CDDIS. The ERP results are submitted additional to IERS Central Bureau and IERS Sub Bureau for Rapid Service and Predictions. ********************************************************************************* Note: Due to AS all product files do not include the days 285, 286 and 291. The ephemerides file for the day 287 (13. Oct.) do not include SV 26 because this satellite is poor modeled on that day ********************************************************************************* CORE STATION SUMMARY The Core Station data used in the solutions is given below. Day of Week 666 T W T F U E H R Site E D U I Name Code ------------------------------------------------- Algonquin ALGO X X X X Fairbanks FAIR X X X X Goldstone DS10 X X X X Hartebeesthoek HART X X X X Kokee Park KOKR - - - - Mc Murdo MCMU X X X X Ny-Alesund NALL X X X X Pamatai PAMA X X X X Santiago SANT X X X X Tai Shi TAIW X X X X Tidbinbilla TIDB X X X X Tromsoe TROM X X X X Usuda USUD X X - X Wettzell WTZ1 X X X X Yellowknife YELL X X X X Yarragadee YAR1 X X X X ------------------------------------------------- SOLUTION CHARACTERISTICS 1. Analysis Center: GFZ/DLR 2. Analysing Team: D. Angermann, R. Galas, Ch. Reigber, S.Y. Zhu 3. Solution Identifier: EPH(GFZ)92G01-DDD ERP(GFZ)92G02-DDD CLK(GFZ)92G01-DDD (only relative) 4. Software used: GEPARD4.0 5. Defintion of Terrestrial Reference Frame Origin: Nominally ITRF-90 Orientation: Nominally ITRF-90 Reference Epoch: 1992.352 (MJD 48750) Fixed set of stations: Y. Bock Solution (IGS Message No.101) ALGO, YELL, FAIR, KOKR, TROM, WTZ1, YAR1, PAMA, MCMU, TAIW, DS10, SANT, HART, NALL, 6. Data used: - undifferenced pseudo ranges and carrier phases - 1-day arc solutions 7. Adjusted parameters: - State vector of all GPS satellites - Daily polar motion - Coordinate corrections for non-fixed stations - Troposheric zenith path delay - Solar radiation scale and y-bias - Ambiguities - ST and SV clock parameters of each observation epoch (the maser-based clock at Fairbanks is taken as reference clock) SOLUTION STATISTICS Arc No. 2 3 4 5 ------------------------------------------------------ Observation Interval [sec] 360 360 360 360 Number of observations 22629 22815 20651 22352 RMS of carrier phases [cm] 0.6 0.6 0.5 0.5 RMS of code measurements [cm] 46.4 49.4 44.0 47.0 ------------------------------------------------------ - GFZ06667.ERP ============ Solution identifier for ERP-Results: * GPS week 650-653: ERP(GFZ)92G01-DDD * since GPS week 654: ERP(GFZ)92G02-DDD Please notice, that these two solutions are related to different reference frames. MJD x sigmax y sigmay 48908.5 0.0914 0.0006 0.4999 0.0006 48909.5 0.0953 0.0003 0.5000 0.0003 48910.5 0.0981 0.0002 0.4983 0.0003 48911.5 0.1004 0.0003 0.4977 0.0003 - GFZ06667.CLK ============ The clock parameter file is avaibable at CDDIS. The format of this file is described in the IGS Message No. 55. ==============================================================================