Author: AC Coordinator / NOAA NGS sum-file Version 2.0 Rapid IGS Orbit Combination - Week 1520 Day: 0 (Feb 22, 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: igr15200.sp3 IGR GPS ephemeris in SP3 format. igr15200.clk IGR GPS satellite and station clocks in RINEX format. igr15200.cls IGR GPS clock combination summary report. igr15200.erp Earth Rotation Parameters (ERP) and their rates as well as Universal Time (UT1-UTC) and Length Of Day (LOD) associated with IGS ephemerides. igr15200.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 ----+--------+--------------- 0 | COD | 3 6 26 0 | ESA | 3 6 26 SYOG 0 | GFZ | 7 13 14 23 29 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 1.1520.0 GPS week: 1520 Day: 0 MJD: 54884.000 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| -19 20 -58 2054 -2455 -2430-28.14 854 854 | 161 -426 2559 3801 cod 132| 2 0 3 0 92 -76 -.20 9 9 | -27 -821 19 89 emr 45| 0 -2 6 -73 -62 -88 .42 20 20 | 1593 1694 13 150 esa 95| -1 1 -5 45 9 -1 .30 11 10 | 119 -195 13 98 gfz 89| -1 -2 -6 -8 -68 -14 -.21 17 17 | 513 -838 22 110 iga n/a| 1 0 0 22 8 -50 -.10 10 9 | 119 -408 40 115 igu n/a| 4 0 0 -59 -286 217 -.02 97 53 | -60 38 1735 4981 jpl 80| -1 -1 9 -17 -55 -10 .56 21 21 | 2240 1735 22 109 ngs 91| -1 1 1 -50 -53 -54 -.31 13 12 | 148 -420 2269 3491 sio 65| 1 -1 -3 71 70 14 -.26 20 19 | 0 0 0 0 usn 35| 0 0 0 25 -25 333 -.05 17 17 | -759 1068 95 161 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 2.1520.0 GPS week: 1520 Day: 0 MJD: 54884.000 Weighted Average PRN | brd cod emr esa gfz iga igu jpl ngs sio usn IGR | ------+-------------------------------------------------------------+ 2 | 455 10 25 12 23 6 48 28 13 16 17 6 | 3E | 764 20 19 18 18 23 467 21 20 19 18 7 | 4 | 390 11 13 8 22 10 25 18 11 12 18 5 | 5 | 870 11 16 7 18 10 19 12 14 11 19 5 | 6E | 745 10 13 13 14 9 31 19 15 33 13 6 | 7 | 761 13 21 12 14 6 19 27 10 18 24 6 | 8 | 931 7 10 9 16 9 185 9 13 19 19 4 | 9 | 1023 7 13 11 14 5 29 12 12 15 18 4 | 10 | 978 8 24 7 11 6 33 9 12 11 18 4 | 11 | 858 8 22 10 15 10 34 20 9 17 17 5 | 12 | 268 10 19 9 18 8 19 19 14 11 17 5 | 13E | 897 8 15 9 20 7 39 24 11 19 12 5 | 14E | 872 10 17 10 15 8 22 27 13 32 11 6 | 15E | 528 8 22 12 23 11 56 32 16 21 23 7 | 16 | 756 9 26 15 15 8 21 30 15 39 14 7 | 17E | 404 8 20 10 16 8 37 22 12 21 12 5 | 18 | 734 8 20 12 13 9 26 22 11 19 17 5 | 19 | 577 7 37 11 21 11 62 23 12 33 10 7 | 20 | 1016 8 20 12 16 10 19 23 11 11 12 5 | 21 | 897 10 22 14 12 7 31 23 11 16 13 5 | 22 | 500 7 20 9 12 10 27 25 9 15 14 5 | 23E | 806 7 16 10 19 12 83 28 12 23 16 6 | 24 | 1273 5 17 9 11 6 28 14 13 21 13 4 | 25 | 1089 8 13 6 15 6 22 17 10 18 11 4 | 26E | 567 11 19 8 20 8 27 20 18 15 32 6 | 27 | 758 8 12 8 17 8 24 10 12 17 15 4 | 28 | 1047 6 22 9 15 7 23 23 10 16 17 5 | 29E | 919 8 27 9 17 14 76 21 15 18 12 5 | 30 | 1708 7 18 8 13 9 43 20 10 15 18 5 | 31 | 764 10 23 11 22 11 26 23 16 18 14 6 | 32 | 879 12 20 12 12 9 15 17 7 13 12 5 | ------+-------------------------------------------------------------+ RMS | 854 9 20 11 17 10 97 21 13 20 17 | WRMS | 854 9 20 10 17 9 53 21 12 19 17 | MEDI | 806 8 20 10 16 9 28 21 12 18 16 | 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 3.1520.0 GPS week: 1520 Day: 0 MJD: 54884.0 CENT| CLK EPO | BRUS | TOW2 | WILL | ----+----------+-------------------+-------------------+-------------------+ cod | cod 2976 | 8 6 19 | 14 13 38 | 6 4 14 | emr | emr 2964 | 8 8 21 | 15 16 43 | 9 6 21 | esa | esa 2976 | 8 6 23 | 13 12 40 | 7 4 16 | gfz | gfz 2941 | 9 10 26 | 20 18 63 | 9 6 16 | igr | igr 2953 | 7 5 20 | 17 14 36 | 7 4 15 | jpl | jpl 2962 | 9 6 18 | 16 16 40 | 8 5 14 | 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 4.1520.0 GPS week: 1520 Day: 0 MJD: 54884.500 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 | -95 -7 -75 91 2 | -4 12 emr uuuuu | 88 33 -183 96 -44 | 53 54 esa uuuuu | -85 -33 -320 -189 18 | -15 28 gfz uuuuu | 31 20 39 -48 -20 | 3 14 iga xxxxx | -46 -18 -105 50 0 | -7 14 igu xxxxx | 331 49 599 110 -2 | 15 92 jpl uuuuu | 68 -11 31 279 34 | -20 25 ngs uuuuu | 34 72 323 -62 18 | -17 36 sio uuxxu | -48 -62 -598 188 -39 | 47 50 usn uuuuu | 2 -25 246 193 21 | -10 24