Author: AC Coordinator / NOAA NGS sum-file Version 2.0 Rapid IGS Orbit Combination - Week 1518 Day: 3 (Feb 11, 2009) Contacts: J. Ray (jim.ray@noaa.gov), J. Griffiths (jake.griffiths@noaa.gov) COMBINATION STRATEGY: --------------------- For a complete description of the combination strategy along with all tables and statistics, please refer to the IGS Final Combination reports posted on CDDIS within 13 days after the end of the GPS week. PRODUCT FILES: -------------- The Rapid Orbit files generated and uploaded into CDDIS @ NASA/GSFC are: igr15183.sp3 IGR GPS ephemeris in SP3 format. igr15183.clk IGR GPS satellite and station clocks in RINEX format. igr15183.cls IGR GPS clock combination summary report. igr15183.erp Earth Rotation Parameters (ERP) and their rates as well as Universal Time (UT1-UTC) and Length Of Day (LOD) associated with IGS ephemerides. igr15183.sum Combination summary report. REMARKS concerning the IGR Orbit Combination: --------------------------------------------- 1. Broadcast ("brd") orbits/clocks are included in the combination for statistics only. However broadcast clock corrections are used for clock alignment to GPS time and centre clock weight determination purposes. 2. The following center solutions (orbits/clocks) were excluded from the combination but kept for statistics: -> Centre: IGA IGU 3. The following centre clock solutions, which provide broadcast clock corrections, were excluded from the combination but kept in the combination statistics: -> Centre: NGS 4. The following clock solutions were excluded from the combination because they were biasing the combined clock solutions (clock shifts/outliers) but were kept for the RMS computation. All clocks from USN. Day | Centre | PRN/STA list ----+--------+--------------- 3 | EMR | 21 3 | ESA | JOZE STJO SYOG 3 | GFZ | 7 15 SCH2 WTZR 3 | JPL | 26 HARB YELL 5. Starting on 5-Nov-2006 (GPS Week 1400-0, MJD 54044) all IGS products, including the IGS combined orbits, are based on the IGS realization of the ITRF2005 reference frame (IGS05). For more information see IGSMAIL #5447. 6. Starting on 5-Nov-2000 (GPS Week 1087-0; mjd=51853) all IGS clock products are based on the new clock combination scheme which uses the the clock RINEX files as input if available, otherwise SP3 clocks are used. The navigation solution is still based on the SP3 clocks but this will soon adopt the clock RINEX files as well. 7. Starting on 5-Nov-2006 (GPS Week 1400, day 0, MJD 54044) the absolute antenna model is introduced (IGSMAIL #5272). The antenna phase center offsets and phase center variations are given in the file: ftp://igscb.jpl.nasa.gov/pub/station/general/igs05.atx ORBIT COMBINATION AND EVALUATION STATISTICS: -------------------------------------------- Table 1: Daily transformation of each centre to the combined IGR orbit and clocks (iga is the 24h adjusted part of Ultra Rapid, igu is the 24h predicted part of Ultra Rapid). WRMS - RMS weighted by the centres SP3 header accuracy codes. STA - Number of stations in the daily solutions. Table 1.1518.3 GPS week: 1518 Day: 3 MJD: 54873.000 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS| TOFT TDRFT SDEV RMS | [mm] [mm] [mm] [uas] [uas] [uas] [ppb] [mm] [mm]| [ps] [ps/d] [ps] [ps] --------+----------------------------------------------------+------------------------------ brd n/a| -11 -103 -74 -257 -1704 -4291-25.72 933 933 | 771 -2059 3071 6450 cod 132| 1 0 1 19 33 -81 -.21 9 8 | 386 -2671 20 134 emr 45| 0 0 3 -52 -92 -119 .52 19 19 | 3936 -944 16 112 esa 95| 0 0 -2 11 0 -10 .26 10 10 | 4212 -2115 18 127 gfz 96| -3 -1 -4 11 -44 -27 -.13 12 12 | 291 -545 19 117 iga n/a| 1 0 0 35 -10 31 -.00 7 7 | 763 -2089 80 127 igu n/a| 1 1 -3 -288 -373 -228 -.08 34 34 | 466 127 2617 4965 jpl 45| 0 -2 4 -45 -52 30 .41 20 20 | 3963 -970 18 213 ngs 95| 1 1 0 1 -71 -63 -.35 14 13 | 775 -2086 2483 5109 sio 66| 1 -1 1 82 100 57 -.16 20 19 | 0 0 0 0 usn 35| 1 2 3 -60 129 468 -.11 19 18 | 1226 -4226 57 167 Table 2: Daily fit for each satellite and each centre resulting from weighted average combination. The last column gives the IGR resulting satellite accuracy measures found in the IGS SP3 header. Eclipsing satellites are flagged with "E" (or "M" for moon) beside the PRN number. "X" stands for excluded from RMS, WRMS and MEDI-combination statistics but included in IGU Units: mm Table 2.1518.3 GPS week: 1518 Day: 3 MJD: 54873.000 Weighted Average PRN | brd cod emr esa gfz iga igu jpl ngs sio usn IGR | ------+-------------------------------------------------------------+ 2 | 318 9 15 11 21 5 22 25 8 30 18 6 | 3 | 852 10 19 9 12 6 23 14 12 32 15 5 | 4 | 952 9 12 7 14 6 25 11 9 24 21 5 | 5 | 1068 7 14 8 12 7 29 13 13 14 18 4 | 6 | 817 11 17 9 12 6 40 13 13 34 17 6 | 7 | 1058 6 22 8 18 9 29 28 18 17 30 6 | 8 | 737 6 11 9 9 7 24 11 13 19 32 5 | 9 | 1004 6 11 12 10 5 31 12 16 23 14 4 | 10 | 778 8 12 10 10 4 29 11 12 14 13 4 | 11 | 1258 11 19 10 10 7 34 26 13 17 14 5 | 12 | 558 6 26 12 12 6 49 21 14 13 15 5 | 13E | 773 6 23 7 9 8 23 19 15 20 12 5 | 14E | 716 10 17 10 12 9 29 21 12 10 27 5 | 15E | 660 10 25 12 15 6 32 20 19 34 13 6 | 16 | 798 9 26 14 11 6 20 26 12 22 13 6 | 17 | 285 8 18 9 9 7 19 29 11 20 14 5 | 18 | 877 6 22 8 9 8 40 24 12 11 15 4 | X19 | 472 6 --- 7 11 9 18 --- --- --- 16 5 | 20 | 1293 9 21 10 15 9 34 26 17 14 18 6 | 21 | 894 10 17 14 8 5 27 27 12 15 21 5 | 22 | 701 7 23 7 10 8 36 24 13 14 11 5 | 23E | 469 7 17 7 17 9 58 26 14 12 22 5 | 24 | 719 8 13 9 11 4 52 13 11 19 12 4 | 25 | 893 5 14 6 7 8 56 12 14 11 21 4 | 26E | 1884 16 19 12 13 9 36 19 25 23 14 6 | 27 | 1267 6 10 8 8 6 30 13 15 14 18 4 | 28 | 909 6 20 8 9 6 19 20 12 24 17 5 | 29 | 545 12 27 13 9 4 33 23 17 19 20 6 | 30 | 1637 7 19 8 8 5 28 16 11 9 22 4 | 31 | 704 8 24 10 12 13 50 25 11 10 34 6 | 32 | 634 11 20 7 12 6 19 16 18 14 15 5 | ------+-------------------------------------------------------------+ RMS | 933 9 19 10 12 7 34 20 14 20 19 | WRMS | 933 8 19 10 12 7 34 20 13 19 18 | MEDI | 798 8 19 9 11 6 29 20 13 17 17 | Table 3: Daily Precise Navigation Summary using the corresponding Centre orbit positions and satellite clock corrections at 15 min intervals. Each line gives the daily station RMS w.r.t. the estimated coordinates for the Latitude, Longitude and Height components. CLK - Satellite clocks used. EPO - Number of satellite clock epochs available for that day. Units: mm Table 3.1518.3 GPS week: 1518 Day: 3 MJD: 54873.0 CENT| CLK EPO | BRUS | TOW2 | WILL | ----+----------+-------------------+-------------------+-------------------+ cod | cod 2976 | 8 5 16 | 20 20 34 | 5 6 11 | emr | emr 2875 | 10 11 24 | 20 22 38 | 9 7 16 | esa | esa 2976 | 9 7 17 | 20 20 38 | 6 5 12 | gfz | gfz 2956 | 9 11 22 | 19 18 47 | 8 8 18 | igr | igr 2976 | 9 8 18 | 20 20 36 | 6 6 12 | jpl | jpl 2874 | 10 8 18 | 19 18 39 | 8 8 17 | Table 4: Earth Orientation Parameters daily summary. Daily Centre ERP, ERP Rates and LOD differences with respect to IGR combined values. Xpole,Xrt: x pole and x pole rate Ypole,Yrt: y pole and y pole rate LOD : Length Of Day AC LOD BIAS : 21-day mean LOD bias with respect to Bulletin A AC LOD BIAS RMS: RMS of AC LOD BIAS FLAG: "u" (used), "x" (excluded), "-" (no submission) for Xpole, Ypole, Xrt, Yrt and LOD A star ("*") beside the AC name indicates that AC LOD values were derived from AC UT1-UTC values. Table 4.1518.3 GPS week: 1518 Day: 3 MJD: 54873.500 AC LOD AC LOD CENT FLAG | Xpole Ypole Xrt Yrt LOD | BIAS BIAS RMS | [uas] [uas] [uas/d] [uas/d] [us]| [us] [us] ------------+----------------------------------------+------------------ cod xxxxx | -38 -24 -83 7 12 | 0 24 emr uuuuu | 58 -12 10 -124 41 | 47 52 esa uuuuu | 2 -7 160 43 -26 | 8 24 gfz uuuuu | 35 -33 -222 -277 29 | 5 26 iga xxxxx | -1 -42 -26 105 3 | 8 25 igu xxxxx | 405 313 537 623 0 | 36 62 jpl uuuuu | 83 22 114 173 9 | -21 34 ngs uuuuu | 50 56 -41 86 -1 | -4 38 sio uuxxu | -143 -49 -60 -375 31 | 24 43 usn uuuuu | -140 44 -46 273 -27 | 18 28