Author: AC Coordinator / NOAA NGS sum-file Version 2.0 Rapid IGS Orbit Combination - Week 1519 Day: 5 (Feb 20, 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: igr15195.sp3 IGR GPS ephemeris in SP3 format. igr15195.clk IGR GPS satellite and station clocks in RINEX format. igr15195.cls IGR GPS clock combination summary report. igr15195.erp Earth Rotation Parameters (ERP) and their rates as well as Universal Time (UT1-UTC) and Length Of Day (LOD) associated with IGS ephemerides. igr15195.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 ----+--------+--------------- 5 | COD | 3 6 26 5 | ESA | 3 6 26 MAS1 PIE1 SYOG TSKB 5 | GFZ | 7 15 MATE SCH2 SYOG TOW2 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 1.1519.5 GPS week: 1519 Day: 5 MJD: 54882.000 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| 49 -19 -88 1513 -427 -2569-27.62 924 924 | -621 772 2745 5007 cod 128| 0 1 2 -2 33 -86 -.17 11 10 | -1195 934 28 107 emr 45| -2 0 6 -100 -30 -57 .43 19 19 | 1252 165 12 124 esa 95| 0 0 -4 33 54 4 .23 10 9 | 1546 -732 17 111 gfz 96| -2 -3 -8 -19 -34 29 -.20 14 14 | -344 491 23 139 iga n/a| 0 0 0 -15 19 -171 -.02 10 8 | -668 828 38 110 igu n/a| -1 1 -2 161 -693 -416 -.08 90 44 | -638 773 2762 5300 jpl 80| 0 1 7 -44 13 18 .45 22 22 | 1988 114 22 119 ngs 95| -1 0 1 113 -105 -17 -.33 15 15 | -626 772 2329 4295 sio 65| 2 -1 0 99 16 32 -.22 21 18 | 0 0 0 0 usn 35| 0 1 2 -151 13 190 -.07 23 24 | -1110 2436 82 142 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 2.1519.5 GPS week: 1519 Day: 5 MJD: 54882.000 Weighted Average PRN | brd cod emr esa gfz iga igu jpl ngs sio usn IGR | ------+-------------------------------------------------------------+ 2 | 1195 10 17 9 19 9 51 24 20 19 20 6 | 3E | 900 19 16 15 20 17 158 18 23 21 18 7 | 4 | 693 11 12 5 20 8 55 30 16 20 18 6 | 5 | 922 8 13 10 9 5 22 12 12 16 15 4 | 6E | 858 26 20 14 32 16 417 23 14 59 24 10 | 7 | 1039 9 22 9 13 9 24 28 12 23 21 6 | 8 | 903 9 16 11 13 29 122 14 17 15 72 9 | 9 | 917 9 12 10 10 6 30 20 13 14 28 5 | 10 | 588 8 14 8 9 6 27 13 13 27 13 5 | 11 | 916 11 19 9 15 10 47 23 15 22 17 6 | 12 | 1099 10 20 11 12 6 19 20 12 11 16 5 | 13E | 1781 8 15 7 14 8 28 24 19 15 20 5 | 14E | 945 9 17 8 13 10 37 24 14 26 15 5 | 15E | 541 11 22 12 11 6 41 30 17 16 16 6 | 16 | 661 11 23 9 17 7 43 24 17 25 22 6 | 17E | 438 9 22 11 12 7 27 24 14 19 19 5 | 18 | 863 8 25 9 13 7 49 24 15 21 16 6 | 19 | 531 8 25 11 11 7 41 24 21 19 12 6 | 20 | 855 10 20 13 14 7 48 26 18 15 24 6 | 21 | 636 12 20 12 13 6 28 30 15 16 20 6 | 22 | 504 7 21 8 11 7 38 24 14 17 11 5 | 23E | 510 10 17 11 15 9 70 29 16 13 24 6 | 24 | 1067 7 15 8 11 5 21 17 12 19 21 4 | 25 | 895 8 13 5 11 9 23 15 11 14 9 4 | 26E | 1119 10 17 13 16 10 37 17 24 24 27 6 | 27 | 1308 7 15 8 9 9 44 15 13 18 15 4 | 28 | 1109 9 18 9 11 7 24 19 9 18 21 5 | 29 | 357 8 25 12 14 7 28 20 7 20 25 6 | 30 | 1365 8 12 7 10 7 47 17 10 10 25 4 | 31 | 822 9 22 10 12 8 40 23 13 22 21 6 | 32 | 756 15 21 11 15 6 26 18 19 12 9 5 | ------+-------------------------------------------------------------+ RMS | 924 11 19 10 14 10 90 22 15 21 23 | WRMS | 924 10 19 9 14 8 44 22 15 18 24 | MEDI | 895 9 18 10 13 7 38 23 14 19 20 | 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 3.1519.5 GPS week: 1519 Day: 5 MJD: 54882.0 CENT| CLK EPO | BRUS | TOW2 | WILL | ----+----------+-------------------+-------------------+-------------------+ cod | cod 2976 | 6 4 17 | 13 59 46 | 8 6 12 | emr | emr 2964 | 10 7 54 | 15 61 65 | 9 7 14 | esa | esa 2976 | 9 6 37 | 15 60 54 | 6 5 11 | gfz | gfz 2948 | 9 8 33 | 18 58 87 | 8 8 14 | igr | igr 2962 | 11 5 53 | 14 56 57 | 7 5 11 | jpl | jpl 2962 | 10 6 51 | 12 59 69 | 9 7 13 | 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 4.1519.5 GPS week: 1519 Day: 5 MJD: 54882.500 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 | -58 -3 -303 56 1 | -6 12 emr uuuuu | -26 80 -87 -86 -18 | 47 49 esa uuuuu | -63 -37 -9 -51 -1 | -19 26 gfz uuuuu | 33 38 -189 -11 0 | 0 10 iga xxxxx | -70 11 -123 61 -4 | -6 14 igu xxxxx | 700 -173 931 -79 -13 | 43 99 jpl uuuuu | -3 43 -159 192 2 | -20 25 ngs uuuuu | 151 -104 320 -90 4 | -10 37 sio uuxxu | -55 -79 -525 -430 -4 | 41 42 usn uuuuu | -31 141 100 235 2 | -7 26