Author: AC Coordinator / NOAA NGS sum-file Version 2.0 Rapid IGS Orbit Combination - Week 1538 Day: 0 (Jun 28, 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: igr15380.sp3 IGR GPS ephemeris in SP3 format. igr15380.clk IGR GPS satellite and station clocks in RINEX format. igr15380.cls IGR GPS clock combination summary report. igr15380.erp Earth Rotation Parameters (ERP) and their rates as well as Universal Time (UT1-UTC) and Length Of Day (LOD) associated with IGS ephemerides. igr15380.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 | 25 YAR2 0 | EMR | 32 WTZR 0 | GFZ | 12 32 FAA1 SYOG 0 | JPL | 32 ZWE2 0 | USN | POTS 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 1.1538.0 GPS week: 1538 Day: 0 MJD: 55010.000 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| 6 17 113 1287 1175 -2370-24.05 975 975 | 12 -14 2274 3965 cod 126| 0 -1 1 33 -53 -69 -.20 11 10 | -310 -657 27 78 emr 45| 0 -1 -7 -55 -100 -13 .32 19 19 | 3894 -887 17 66 esa 95| 0 1 -1 -4 33 27 .30 9 9 | 396 -1993 17 83 gfz 92| 0 0 1 -7 25 -6 -.22 12 12 | 270 -306 27 81 iga n/a| 1 1 -1 50 35 18 -.06 10 9 | 16 -1 24 111 igu n/a| 2 0 3 204 159 -164 -.06 75 68 | 151 -819 1573 2552 jpl 80| -3 1 -9 -24 4 -57 .45 18 17 | 3828 -548 13 71 ngs 95| 1 0 0 32 -15 3 -.30 14 13 | 74 -74 2040 3489 sio 66| -2 0 7 42 -22 104 -.21 19 19 | 0 0 0 0 usn 32| 4 -1 6 -24 147 -11 -.04 20 19 | -356 -1472 58 111 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 2.1538.0 GPS week: 1538 Day: 0 MJD: 55010.000 Weighted Average PRN | brd cod emr esa gfz iga igu jpl ngs sio usn IGR | ------+-------------------------------------------------------------+ X1E |81471 6 --- --- --- --- --- --- --- --- --- 0 | 2 | 397 13 13 10 11 8 31 17 6 20 13 4 | 3 | 2054 7 13 9 7 7 19 12 16 20 20 4 | 4 | 558 13 15 9 15 8 42 13 16 17 17 5 | 6 | 833 8 13 6 7 6 20 12 18 18 17 4 | 7 | 524 10 18 9 14 9 20 23 11 19 21 5 | 8 | 1136 10 17 9 10 8 20 16 11 13 24 5 | 9 | 1107 8 17 8 14 7 22 14 12 17 16 4 | 10E | 668 20 22 12 14 14 194 18 17 30 25 7 | 11 | 979 7 13 5 9 7 29 14 12 22 22 4 | 12E | 519 17 23 11 11 25 118 22 16 18 22 6 | 13 | 823 7 18 9 9 6 20 24 12 13 18 5 | 14 | 719 8 21 9 9 6 21 16 16 25 10 5 | 15 | 530 11 17 12 22 9 17 20 13 12 18 6 | 16 | 897 10 24 9 10 16 33 23 18 20 18 6 | 17 | 594 11 18 10 27 8 21 22 16 19 17 6 | 18E | 730 10 20 10 9 5 25 21 12 13 18 5 | 19 | 490 9 15 8 9 5 35 17 11 21 21 5 | 20 | 740 9 18 9 12 10 167 13 10 17 15 4 | 21 | 848 9 16 7 8 5 18 17 10 21 16 4 | 22E | 755 13 18 12 5 7 54 17 13 17 19 5 | 23 | 443 10 22 10 8 6 29 23 13 18 22 5 | 24 | 698 8 10 7 9 4 37 10 10 12 14 3 | X25 | 643 28 48 10 33 15 34 --- 28 --- 35 13 | 26 | 1065 8 13 7 6 4 26 12 9 20 12 4 | 27 | 2027 8 21 8 14 5 18 13 15 17 15 5 | 28 | 1072 11 18 8 18 11 37 18 15 13 44 7 | 29 | 834 12 18 9 14 8 44 21 12 17 15 5 | 30E | 1601 12 24 12 9 17 248 20 11 23 20 6 | 31 | 584 9 21 10 9 8 14 17 19 24 22 6 | 32E | 1339 12 29 8 10 13 69 18 22 29 14 6 | ------+-------------------------------------------------------------+ RMS | 975 11 19 9 12 10 75 18 14 19 20 | WRMS | 975 10 19 9 12 9 68 17 13 19 19 | MEDI | 755 10 18 9 10 8 29 17 13 18 18 | 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 3.1538.0 GPS week: 1538 Day: 0 MJD: 55010.0 CENT| CLK EPO | BRUS | TOW2 | WILL | ----+----------+-------------------+-------------------+-------------------+ cod | cod 2976 | 11 11 23 | 7 16 25 | 9 11 22 | emr | emr 2855 | 14 11 26 | 18 16 113 | 9 9 18 | esa | esa 2880 | 11 12 25 | 4 13 34 | 7 8 17 | gfz | gfz 2857 | 12 11 23 | 11 17 74 | 10 9 23 | igr | igr 2877 | 12 12 25 | 5 10 29 | 8 10 17 | jpl | jpl 2772 | 12 11 25 | 10 21 56 | 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 4.1538.0 GPS week: 1538 Day: 0 MJD: 55010.500 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 | 51 -58 263 135 -6 | 1 31 emr uuuuu | 147 78 108 284 4 | -6 40 esa uuuuu | -15 -13 -32 107 7 | -9 31 gfz uuuuu | -40 -3 -49 -482 -19 | 14 31 iga xxxxx | -24 -79 117 36 -6 | -2 28 igu xxxxx | -148 -272 219 -298 -13 | -34 61 jpl uuuuu | 36 -17 154 194 -14 | -3 33 ngs uuuuu | 16 -5 -29 178 14 | 0 24 sio uuuuu | 27 19 -295 -79 -22 | 22 43 usn uuuuu | -140 -39 242 -83 9 | -12 29