Author: AC Coordinator / NOAA NGS sum-file Version 2.0 Rapid IGS Orbit Combination - Week 1515 Day: 5 (Jan 23, 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: igr15155.sp3 IGR GPS ephemeris in SP3 format. igr15155.clk IGR GPS satellite and station clocks in RINEX format. igr15155.cls IGR GPS clock combination summary report. igr15155.erp Earth Rotation Parameters (ERP) and their rates as well as Universal Time (UT1-UTC) and Length Of Day (LOD) associated with IGS ephemerides. igr15155.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 | EMR | 5 30 5 | ESA | SCH2 YELL 5 | GFZ | 7 12 5 | JPL | 5 30 NICO SCH2 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 1.1515.5 GPS week: 1515 Day: 5 MJD: 54854.000 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| -36 3 46 872 314 -1941-24.69 1159 1159 | -496 447 2878 5353 cod 131| 1 0 0 7 45 -60 -.15 9 9 | -961 580 21 136 emr 45| 0 1 3 -57 -67 -110 .36 20 20 | -720 853 16 113 esa 95| 0 -1 -3 10 -10 28 .34 8 8 | -2119 1709 19 96 gfz 88| 0 0 -3 42 -77 -42 -.24 13 13 | -183 107 22 125 iga n/a| 0 0 0 41 -44 86 -.08 8 7 | -454 412 20 113 igu n/a| 0 -1 -4 -83 -145 58 -.08 56 34 | -432 324 3375 6501 jpl 45| 0 -1 10 15 -53 74 .53 24 24 | 432 661 19 137 ngs 90| 0 0 5 9 -96 -40 -.35 14 11 | -487 434 2506 4660 sio 63| 1 0 -1 70 47 79 -.35 18 16 | 0 0 0 0 usn 35| 2 0 -1 -111 198 141 -.07 16 14 | -1156 926 54 122 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 2.1515.5 GPS week: 1515 Day: 5 MJD: 54854.000 Weighted Average PRN | brd cod emr esa gfz iga igu jpl ngs sio usn IGR | ------+-------------------------------------------------------------+ 2 | 300 5 18 9 11 6 21 38 15 11 19 5 | 3 | 894 7 16 7 8 11 128 16 12 15 12 4 | 4 | 595 9 13 7 13 8 38 17 12 12 16 4 | 5E | 1433 10 23 9 22 13 121 23 24 24 24 7 | 6 | 1003 6 10 9 7 4 49 14 11 15 15 4 | 7 | 668 7 25 8 14 7 22 22 7 15 19 5 | 8 | 1289 10 13 7 9 7 9 13 10 15 18 4 | 9 | 2209 10 13 6 13 4 16 12 12 12 13 4 | 10 | 973 11 20 10 11 5 23 19 9 22 10 5 | 11 | 895 10 17 6 15 9 47 37 12 12 21 5 | 12E | 803 8 25 7 19 10 45 27 13 13 17 5 | 13 | 703 5 24 6 7 4 18 22 12 18 9 4 | 14 | 839 7 26 7 14 5 17 20 12 20 16 5 | 15 | 1043 11 25 7 13 9 13 24 9 31 10 5 | 16E | 697 7 23 10 10 7 21 28 17 15 14 5 | 17 | 504 7 24 7 10 6 17 36 12 14 15 5 | 18 | 950 11 19 7 13 7 36 25 14 21 14 5 | 19 | 499 7 25 7 9 6 25 29 10 13 14 5 | 20 | 1141 8 24 8 17 4 14 30 13 18 16 5 | 21 | 944 10 10 6 13 6 23 22 13 15 9 4 | 22 | 536 11 18 9 11 9 61 22 11 20 15 5 | 23 | 634 7 27 10 12 3 16 31 8 20 15 5 | 24 | 984 6 12 9 13 6 36 10 9 14 9 3 | 25 | 947 6 15 8 8 8 21 17 7 14 20 4 | 26 | 2314 12 14 10 14 7 21 15 13 12 11 4 | 27 | 2419 10 13 5 9 6 11 13 11 14 13 4 | 28E | 977 10 12 9 12 5 13 29 13 13 10 4 | 29 | 1005 7 29 8 10 7 34 30 14 26 14 6 | 30E | 2030 18 19 9 19 21 205 26 35 39 26 8 | 31 | 705 12 26 8 12 6 50 24 12 23 18 6 | 32 | 1101 7 20 7 13 7 14 20 13 16 17 4 | ------+-------------------------------------------------------------+ RMS | 1158 9 20 8 13 8 56 24 14 18 16 | WRMS | 1158 9 20 8 13 7 34 24 11 16 14 | MEDI | 947 8 19 8 12 7 22 22 12 15 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 3.1515.5 GPS week: 1515 Day: 5 MJD: 54854.0 CENT| CLK EPO | BRUS | WILL | ----+----------+-------------------+-------------------+ cod | cod 2976 | 11 9 26 | 14 13 32 | emr | emr 2968 | 14 12 27 | 15 13 32 | esa | esa 2976 | 11 8 25 | 13 13 30 | gfz | gfz 2956 | 14 7 32 | 15 17 41 | igr | igr 2976 | 12 10 27 | 14 14 32 | jpl | jpl 2968 | 25 15 32 | 16 16 39 | 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 4.1515.5 GPS week: 1515 Day: 5 MJD: 54854.500 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 -31 81 -6 6 | -5 18 emr uuuuu | 70 43 -181 151 0 | 10 24 esa uuuuu | -10 -18 -92 -64 21 | -17 27 gfz uuuuu | 40 -52 -1 125 -12 | 6 19 iga xxxxx | 29 -52 98 11 5 | -3 17 igu xxxxx | 193 118 426 200 -28 | 30 38 jpl uuuuu | 24 -25 -209 87 3 | -9 20 ngs uuuuu | 92 40 137 -254 7 | -7 27 sio uuxxu | -53 -77 -466 -210 2 | 8 23 usn uuuuu | -180 110 321 147 -6 | 0 19