Author: AC Coordinator / NOAA NGS sum-file Version 2.0 Rapid IGS Orbit Combination - Week 1517 Day: 3 (Feb 04, 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: igr15173.sp3 IGR GPS ephemeris in SP3 format. igr15173.clk IGR GPS satellite and station clocks in RINEX format. igr15173.cls IGR GPS clock combination summary report. igr15173.erp Earth Rotation Parameters (ERP) and their rates as well as Universal Time (UT1-UTC) and Length Of Day (LOD) associated with IGS ephemerides. igr15173.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 ----+--------+--------------- 3 | EMR | DAEJ WTZR YELL 3 | ESA | JOZE NRC1 TSKB YELL 3 | GFZ | 7 15 23 STJO 3 | JPL | TIDB 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 1.1517.3 GPS week: 1517 Day: 3 MJD: 54866.000 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| 85 -3 -9 -1331 -3234 -3813-28.78 833 833 | 166 -478 2908 4893 cod 124| 0 0 0 31 19 -8 -.17 9 9 | -45 -718 23 151 emr 45| -3 1 0 -71 -105 -58 .45 20 20 | 1000 1169 10 86 esa 95| 1 0 -2 24 31 41 .29 11 11 | -2714 4287 15 124 gfz 95| 0 0 0 -9 -67 -12 -.15 11 11 | 183 -196 22 134 iga n/a| 1 0 0 3 1 108 -.04 8 7 | 187 -642 47 154 igu n/a| 3 0 2 -296 -104 -752 -.01 50 41 | 264 -827 2277 5155 jpl 45| -2 2 4 -45 11 47 .48 22 22 | 2632 1504 18 209 ngs 89| 1 1 -3 -89 -56 57 -.17 14 13 | 185 -631 2350 3995 sio 65| 2 0 1 111 70 93 -.33 18 18 | 0 0 0 0 usn 35| 1 0 7 23 159 -307 -.05 27 25 | -415 1578 133 284 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 2.1517.3 GPS week: 1517 Day: 3 MJD: 54866.000 Weighted Average PRN | brd cod emr esa gfz iga igu jpl ngs sio usn IGR | ------+-------------------------------------------------------------+ 2 | 229 9 15 15 18 9 41 24 13 17 80 8 | 3 | 686 11 17 12 13 8 38 15 12 21 24 5 | 4 | 624 9 14 14 13 11 38 19 14 12 19 5 | 5 | 736 7 18 12 9 9 31 14 14 22 15 5 | 6 | 763 8 15 14 11 6 47 13 14 20 26 5 | 7 | 521 8 22 9 13 8 44 26 15 21 27 6 | 8 | 984 11 13 8 10 8 58 14 12 13 23 4 | 9 | 533 6 13 11 8 6 30 14 12 15 20 4 | 10 | 826 8 15 11 10 8 31 14 15 29 21 5 | 11 | 1204 11 17 11 7 5 39 24 16 16 19 5 | 12 | 399 8 21 13 11 8 37 18 16 17 13 5 | 13E | 765 9 22 7 11 13 182 32 16 20 27 6 | 14E | 803 9 26 13 10 9 49 22 14 10 28 6 | 15E | 242 12 21 10 21 9 24 19 10 26 20 6 | 16 | 1002 9 27 11 12 6 26 28 15 23 21 6 | 17 | 897 7 19 12 9 7 29 34 15 9 28 6 | 18 | 773 7 25 11 12 7 38 26 13 28 23 6 | 19 | 1047 11 24 10 14 7 42 27 14 22 26 6 | 20 | 907 8 22 12 10 6 24 23 15 17 18 5 | 21 | 1420 8 15 9 14 6 30 22 13 12 28 5 | 22 | 1120 9 25 11 11 8 29 28 12 22 27 6 | 23E | 688 8 21 13 10 6 46 24 21 12 20 5 | 24 | 721 8 15 7 9 5 45 11 9 8 27 4 | 25 | 786 7 15 9 7 6 26 12 20 17 32 5 | 26E | 734 16 20 11 14 10 48 19 10 14 29 6 | 27 | 1141 8 20 10 7 8 33 15 15 15 25 5 | 28 | 901 8 17 9 9 7 33 23 14 12 20 5 | 29 | 1012 13 25 11 12 8 41 26 11 22 21 6 | 30 | 618 7 17 12 8 8 32 17 12 14 18 4 | 31 | 429 12 20 8 10 6 56 25 16 12 21 5 | 32 | 968 10 23 14 9 6 37 18 17 14 23 5 | ------+-------------------------------------------------------------+ RMS | 833 9 20 11 11 8 50 22 14 18 27 | WRMS | 833 9 20 11 11 7 41 22 13 18 25 | MEDI | 773 8 20 11 10 8 38 22 14 17 23 | 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 3.1517.3 GPS week: 1517 Day: 3 MJD: 54866.0 CENT| CLK EPO | BRUS | TOW2 | WILL | ----+----------+-------------------+-------------------+-------------------+ cod | cod 2976 | 6 5 16 | 8 9 25 | 7 4 17 | emr | emr 2976 | 8 7 22 | 10 8 33 | 9 8 18 | esa | esa 2976 | 7 6 21 | 8 8 25 | 7 5 16 | gfz | gfz 2958 | 9 9 29 | 11 11 27 | 10 8 27 | igr | igr 2976 | 7 7 19 | 8 8 25 | 7 5 17 | jpl | jpl 2976 | 8 13 22 | 27 9 32 | 8 9 24 | 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 4.1517.3 GPS week: 1517 Day: 3 MJD: 54866.500 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 | -24 -53 229 -15 -22 | -2 15 emr uuuuu | 100 33 -29 225 4 | 19 28 esa uuuuu | -48 -30 -4 17 -8 | -6 20 gfz uuuuu | 76 -17 40 -194 -21 | 2 16 iga xxxxx | -24 -25 74 -24 -9 | -3 15 igu xxxxx | 130 273 192 378 51 | 17 58 jpl uuuuu | -39 25 248 180 -42 | -12 21 ngs uuuuu | 40 96 -154 -52 38 | -11 19 sio uuxxu | -72 -64 100 -258 12 | -5 17 usn uuuuu | -170 -41 -52 100 23 | -1 22