Author: AC Coordinator / NOAA NGS sum-file Version 2.0 Rapid IGS Orbit Combination - Week 1519 Day: 6 (Feb 21, 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: igr15196.sp3 IGR GPS ephemeris in SP3 format. igr15196.clk IGR GPS satellite and station clocks in RINEX format. igr15196.cls IGR GPS clock combination summary report. igr15196.erp Earth Rotation Parameters (ERP) and their rates as well as Universal Time (UT1-UTC) and Length Of Day (LOD) associated with IGS ephemerides. igr15196.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 ----+--------+--------------- 6 | COD | 3 6 6 | EMR | 26 6 | ESA | 3 6 SYOG 6 | GFZ | 7 14 26 29 6 | JPL | MIZU 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 1.1519.6 GPS week: 1519 Day: 6 MJD: 54883.000 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| -2 -27 -67 1393 -1553 -3197-26.34 840 840 | 63 -275 2662 5196 cod 131| 1 0 3 0 47 -69 -.17 12 10 | -283 -419 22 103 emr 45| 0 0 7 -63 -66 -82 .41 20 20 | 808 640 15 149 esa 95| 2 0 -4 17 23 2 .26 10 9 | 1357 -738 17 117 gfz 95| -4 -3 -3 -21 -71 -73 -.18 14 14 | 62 -532 26 131 iga n/a| 1 1 0 -29 -15 140 .02 9 7 | 1 -241 28 105 igu n/a| 1 2 -2 5 -124 -88 -.09 94 62 | 65 -333 1917 4551 jpl 80| 0 2 7 -28 -34 -3 .50 21 21 | 1310 737 18 95 ngs 93| 0 3 0 2 -123 -5 -.46 14 13 | 68 -289 2346 4426 sio 63| 2 -3 0 166 77 9 -.23 20 17 | 0 0 0 0 usn 35| -1 1 0 -83 134 280 -.02 18 17 | -800 1585 67 133 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 2.1519.6 GPS week: 1519 Day: 6 MJD: 54883.000 Weighted Average PRN | brd cod emr esa gfz iga igu jpl ngs sio usn IGR | ------+-------------------------------------------------------------+ 2 | 276 10 18 11 20 6 76 24 13 29 11 6 | 3E | 771 27 17 14 25 21 357 18 19 17 26 8 | 4 | 1607 9 13 9 15 8 35 18 7 19 28 5 | 5 | 812 8 14 7 9 5 16 14 9 21 16 4 | 6E | 1035 17 15 13 19 7 176 19 13 39 15 7 | 7 | 769 9 23 6 15 6 18 26 11 21 19 5 | 8 | 807 8 15 7 11 18 112 11 22 15 22 5 | 9 | 788 14 14 10 9 6 22 20 11 21 12 5 | 10 | 548 8 21 11 15 5 18 13 13 22 13 5 | 11 | 1043 7 20 9 10 7 26 23 13 25 14 5 | 12 | 637 10 20 10 15 5 23 22 12 13 11 5 | 13E | 847 8 17 7 17 6 91 24 16 16 14 5 | 14E | 719 10 18 9 10 7 57 21 15 17 21 5 | 15E | 430 14 24 11 13 11 197 27 19 14 22 6 | 16 | 676 13 29 10 12 6 27 30 19 18 13 6 | 17E | 398 8 20 10 19 9 50 27 11 22 30 6 | 18 | 725 7 25 9 19 7 29 24 11 19 11 5 | 19 | 379 8 26 9 12 5 26 23 10 23 11 5 | 20 | 1301 8 22 8 12 7 13 23 15 20 20 5 | 21 | 823 12 19 10 14 5 23 27 14 13 13 5 | 22 | 1236 9 22 7 17 6 21 22 14 12 12 5 | 23E | 600 8 25 10 14 7 91 26 12 17 11 5 | 24 | 1150 6 26 9 10 4 22 10 13 16 10 4 | 25 | 637 8 15 7 14 8 39 13 16 16 22 5 | 26E | 680 13 21 12 13 7 19 19 23 27 24 7 | 27 | 1001 5 12 8 9 7 18 9 13 16 17 4 | 28 | 936 7 19 7 11 6 9 24 11 12 17 5 | 29E | 737 24 20 14 15 20 157 18 14 22 27 7 | 30 | 889 9 16 5 9 5 18 14 10 11 18 4 | 31 | 669 11 23 12 13 10 51 25 10 21 20 6 | 32 | 640 11 21 4 14 7 11 14 13 16 18 5 | ------+-------------------------------------------------------------+ RMS | 840 12 20 10 14 9 94 21 14 20 18 | WRMS | 840 10 20 9 14 7 62 21 13 17 17 | MEDI | 769 9 20 9 14 7 26 22 13 18 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 3.1519.6 GPS week: 1519 Day: 6 MJD: 54883.0 CENT| CLK EPO | BRUS | TOW2 | WILL | ----+----------+-------------------+-------------------+-------------------+ cod | cod 2976 | 7 8 15 | 17 15 42 | 6 5 17 | emr | emr 2964 | 9 7 20 | 21 20 50 | 8 5 15 | esa | esa 2976 | 6 8 18 | 18 14 42 | 5 4 15 | gfz | gfz 2943 | 9 9 22 | 22 16 68 | 7 7 22 | igr | igr 2956 | 8 8 18 | 20 14 47 | 6 4 15 | jpl | jpl 2961 | 9 9 19 | 19 15 50 | 6 7 15 | 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 4.1519.6 GPS week: 1519 Day: 6 MJD: 54883.500 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 | -32 -13 120 6 11 | -6 12 emr uuuuu | 52 13 -37 -28 -33 | 50 53 esa uuuuu | -33 -6 84 -42 6 | -17 27 gfz uuuuu | 51 1 -241 -36 -4 | 1 12 iga xxxxx | 15 28 8 66 0 | -7 14 igu xxxxx | 158 -43 204 -93 -57 | 25 95 jpl uuuuu | 56 31 -140 180 21 | -20 25 ngs uuuuu | 100 35 251 -71 -6 | -16 37 sio uuxxu | -86 -166 -351 -59 -11 | 45 48 usn uuuuu | -144 84 -59 118 6 | -9 25