Author: AC Coordinator / NOAA NGS sum-file Version 2.0 Rapid IGS Orbit Combination - Week 1518 Day: 1 (Feb 09, 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: igr15181.sp3 IGR GPS ephemeris in SP3 format. igr15181.clk IGR GPS satellite and station clocks in RINEX format. igr15181.cls IGR GPS clock combination summary report. igr15181.erp Earth Rotation Parameters (ERP) and their rates as well as Universal Time (UT1-UTC) and Length Of Day (LOD) associated with IGS ephemerides. igr15181.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 ----+--------+--------------- 1 | ESA | 4 JOZE SYOG TSKB 1 | GFZ | 7 15 1 | JPL | 4 26 DAEJ 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 1.1518.1 GPS week: 1518 Day: 1 MJD: 54871.000 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| 55 21 -64 -1703 1196 -5030-25.16 905 905 | -326 432 2365 4621 cod 130| 0 0 0 15 65 -40 -.18 9 9 | -1126 1134 21 137 emr 45| -1 0 4 -68 -91 -109 .52 20 20 | 727 788 16 99 esa 95| 0 0 -2 20 6 -6 .26 11 10 | 45 -71 19 141 gfz 96| 0 -2 -2 -39 -105 -39 -.20 13 13 | -48 -90 23 136 iga n/a| 1 1 1 0 45 -40 -.08 8 7 | -330 429 72 145 igu n/a| 1 0 0 221 -61 -474 -.02 37 36 | -327 417 2707 5806 jpl 45| -1 1 1 -23 10 51 .53 20 20 | 2101 1025 15 194 ngs 105| 1 1 0 28 -27 -17 -.28 12 11 | -326 432 2151 4047 sio 68| 0 -1 0 91 35 56 -.20 20 18 | 0 0 0 0 usn 35| 0 2 0 -62 82 192 -.11 16 16 | -1257 1112 72 165 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 2.1518.1 GPS week: 1518 Day: 1 MJD: 54871.000 Weighted Average PRN | brd cod emr esa gfz iga igu jpl ngs sio usn IGR | ------+-------------------------------------------------------------+ 2 | 296 9 16 11 21 6 22 24 15 18 27 6 | 3 | 824 9 18 11 16 7 33 15 10 38 14 6 | 4 | 457 12 24 13 13 7 64 21 16 18 17 6 | 5 | 741 13 14 8 15 6 40 14 11 12 14 4 | 6 | 763 10 23 11 15 13 60 13 12 37 18 6 | 7 | 787 7 19 9 9 7 24 25 10 32 17 6 | 8 | 1245 8 17 7 5 8 32 10 7 16 17 4 | 9 | 1622 9 11 11 11 6 37 16 13 18 12 4 | 10 | 635 8 17 11 7 8 24 12 12 13 14 4 | 11 | 792 9 21 8 13 8 45 26 10 25 14 5 | 12 | 508 6 22 9 17 4 22 18 14 11 15 5 | 13E | 853 6 15 9 8 7 71 20 13 19 9 4 | 14E | 1020 8 22 9 17 13 25 19 15 20 16 5 | 15E | 539 7 28 12 18 7 31 21 12 27 12 6 | 16 | 933 9 25 10 11 5 26 25 13 16 16 5 | 17 | 418 9 21 12 14 6 28 23 13 15 17 5 | 18 | 812 9 23 9 13 8 31 23 11 11 17 5 | 19 | 733 7 19 11 13 6 26 28 10 14 18 5 | 20 | 953 7 20 9 11 7 26 23 14 17 10 5 | 21 | 827 10 31 12 12 5 26 25 11 19 19 6 | 22 | 429 10 22 10 12 8 27 25 17 15 13 5 | 23E | 492 6 21 9 16 7 17 24 11 20 11 5 | 24 | 1358 6 16 12 10 5 28 11 11 16 16 4 | 25 | 1186 6 12 7 6 6 49 12 9 21 14 4 | 26E | 1623 16 22 13 13 10 49 24 22 20 18 6 | 27 | 1421 6 14 6 8 8 39 16 7 19 14 4 | 28 | 773 7 17 12 9 7 40 22 10 17 14 4 | 29 | 800 10 32 17 10 5 36 24 9 12 11 6 | 30 | 1023 13 16 7 13 7 38 15 11 10 17 4 | 31 | 391 9 23 9 11 11 33 21 12 15 13 5 | 32 | 725 8 17 15 11 9 23 16 11 15 16 5 | ------+-------------------------------------------------------------+ RMS | 905 9 20 11 13 8 37 20 12 20 15 | WRMS | 905 9 20 10 13 7 36 20 11 18 16 | MEDI | 792 9 20 10 12 7 31 21 11 17 15 | 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 3.1518.1 GPS week: 1518 Day: 1 MJD: 54871.0 CENT| CLK EPO | BRUS | TOW2 | WILL | ----+----------+-------------------+-------------------+-------------------+ cod | cod 2976 | 6 6 20 | 6 6 27 | 6 5 15 | emr | emr 2972 | 7 10 23 | 7 6 33 | 8 5 16 | esa | esa 2976 | 7 7 19 | 6 6 24 | 6 5 16 | gfz | gfz 2957 | 9 12 22 | 10 7 37 | 10 9 25 | igr | igr 2976 | 7 7 19 | 6 6 28 | 7 6 15 | jpl | jpl 2971 | 10 8 25 | 6 7 34 | 10 9 28 | 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 4.1518.1 GPS week: 1518 Day: 1 MJD: 54871.500 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 | -82 -17 -43 104 5 | 4 25 emr uuuuu | 70 39 -221 297 15 | 46 51 esa uuuuu | -28 -14 -183 -190 -28 | 11 24 gfz uuuuu | 81 50 -96 104 1 | 8 26 iga xxxxx | -47 12 15 35 -8 | 9 25 igu xxxxx | 98 -256 303 -336 94 | 29 53 jpl uuuuu | -18 19 -93 255 29 | -12 33 ngs uuuuu | 4 -59 304 -216 20 | -11 35 sio uuxxu | -47 -52 -514 -132 13 | 18 37 usn uuuuu | -66 38 267 75 -9 | 15 27