Author: AC Coordinator / NOAA NGS sum-file Version 2.0 Rapid IGS Orbit Combination - Week 1540 Day: 2 (Jul 14, 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: igr15402.sp3 IGR GPS ephemeris in SP3 format. igr15402.clk IGR GPS satellite and station clocks in RINEX format. igr15402.cls IGR GPS clock combination summary report. igr15402.erp Earth Rotation Parameters (ERP) and their rates as well as Universal Time (UT1-UTC) and Length Of Day (LOD) associated with IGS ephemerides. igr15402.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 ----+--------+--------------- 2 | COD | 16 CEDU KERG ONSA 2 | EMR | 30 WTZR 2 | ESA | STJO TSKB YELL 2 | GFZ | 8 12 16 30 CHUR FAA1 NLIB NYAL VILL 2 | JPL | 17 32 AUCK 2 | USN | POTS 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 1.1540.2 GPS week: 1540 Day: 2 MJD: 55026.000 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| 35 10 70 -121 -371 -2769-25.02 1062 1062 | 82 -266 2186 4344 cod 128| 0 -2 -2 3 25 9 -.18 9 8 | -144 -527 19 94 emr 45| -5 -4 -4 -60 -114 73 .37 21 21 | 1937 -1333 14 70 esa 94| 0 0 2 5 7 100 .33 9 9 | -697 -777 13 72 gfz n/a| 0 2 2 -11 -53 63 -.11 10 10 | -159 425 24 175 iga n/a| 1 0 0 26 -8 88 -.01 7 6 | 66 -253 70 128 igu n/a| 1 0 -1 157 -152 -161 -.06 73 57 | 86 -275 895 1607 jpl 80| 1 -3 -7 18 2 69 .48 18 17 | 927 -1479 13 78 ngs 160| 0 0 -1 -69 -74 -66 -.27 12 11 | 84 -270 2078 3988 sio 65| 0 0 4 30 104 110 -.35 17 17 | 0 0 0 0 usn 32| 1 0 0 76 109 -459 -.05 15 15 | -1126 298 60 116 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 2.1540.2 GPS week: 1540 Day: 2 MJD: 55026.000 Weighted Average PRN | brd cod emr esa gfz iga igu jpl ngs sio usn IGR | ------+-------------------------------------------------------------+ X1E |89032 24 --- --- --- --- --- --- 39 --- --- 30 | 2 | 254 9 11 8 8 4 40 13 8 13 12 3 | 3 | 1921 5 13 8 12 5 24 13 17 8 13 4 | 4 | 743 7 10 7 8 4 50 9 10 11 12 3 | 6 | 713 7 12 9 9 6 33 14 14 11 11 4 | 7 | 469 9 20 12 8 6 45 19 14 16 12 5 | 8 | 800 8 11 12 7 6 46 11 12 13 12 4 | 9 | 1117 6 18 6 9 6 36 11 7 11 10 3 | 10 | 1037 10 17 8 9 7 28 11 12 11 20 4 | 11 | 1121 10 14 4 14 8 51 14 11 13 14 4 | 12E | 424 10 19 9 8 12 326 24 10 21 22 5 | 13 | 768 7 24 11 5 5 27 18 11 29 11 5 | 14 | 1343 10 23 9 11 8 20 18 10 17 20 5 | 15 | 415 11 27 8 13 8 39 13 9 17 15 5 | 16E | 704 12 25 9 12 14 116 30 14 21 33 7 | 17 | 722 10 19 9 12 6 19 22 13 20 10 5 | 18 | 666 7 28 10 10 6 18 22 14 16 17 5 | 19 | 414 9 19 11 12 5 24 23 18 32 10 6 | 20 | 1203 7 23 13 6 5 37 18 12 19 8 4 | 21 | 786 4 16 8 6 4 27 16 11 16 14 4 | 22 | 765 7 22 8 9 5 18 15 11 13 14 4 | 23 | 343 8 28 9 6 4 19 22 10 17 17 5 | 24 | 1941 4 11 6 7 5 25 13 8 10 13 3 | 25 | 795 7 11 6 7 5 53 10 17 15 13 4 | 26 | 687 8 20 7 9 6 21 15 9 12 18 4 | 27 | 2446 7 20 8 8 7 31 9 8 13 8 3 | 28E | 990 10 19 15 8 8 77 27 12 16 13 5 | 29 | 1237 15 25 7 12 5 29 26 14 19 19 6 | 30E | 1502 10 47 10 14 10 77 22 15 30 14 7 | 31 | 352 10 24 12 12 5 53 25 15 18 19 6 | 32 | 1284 9 16 7 9 6 26 18 12 10 13 4 | ------+-------------------------------------------------------------+ RMS | 1061 9 21 9 10 7 73 18 12 17 15 | WRMS | 1061 8 21 9 10 6 57 17 11 17 15 | MEDI | 786 9 19 8 9 6 31 16 12 16 13 | 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 3.1540.2 GPS week: 1540 Day: 2 MJD: 55026.0 CENT| CLK EPO | BRUS | TOW2 | WILL | ----+----------+-------------------+-------------------+-------------------+ cod | cod 2976 | 9 8 25 | 7 29 26 | 10 8 30 | emr | emr 2875 | 11 10 27 | 10 27 40 | 8 9 21 | esa | esa 2880 | 9 9 25 | 8 28 30 | 8 7 25 | gfz | gfz 2863 | 9 8 25 | 11 34 45 | 9 9 27 | igr | igr 2876 | 9 8 25 | 8 26 30 | 8 7 24 | jpl | jpl 2875 | 11 8 30 | 8 21 32 | 8 6 23 | 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 4.1540.2 GPS week: 1540 Day: 2 MJD: 55026.500 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 8 -152 177 5 | 3 17 emr uuuuu | 166 61 -68 -3 -6 | 18 26 esa uuuuu | -51 -6 -112 -178 12 | 6 17 gfz uuuuu | 56 4 149 26 1 | 12 21 iga xxxxx | -11 -34 -31 -32 -7 | 15 18 igu xxxxx | 201 -146 536 -39 47 | -10 61 jpl uuuuu | -43 -39 12 22 -16 | 15 22 ngs uuuuu | 76 59 14 326 10 | 14 21 sio uuuuu | -147 -3 -383 -450 -22 | 20 27 usn uuuuu | -55 -77 288 249 4 | 26 27