Author: AC Coordinator / NOAA NGS sum-file Version 2.0 Rapid IGS Orbit Combination - Week 1538 Day: 5 (Jul 03, 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: igr15385.sp3 IGR GPS ephemeris in SP3 format. igr15385.clk IGR GPS satellite and station clocks in RINEX format. igr15385.cls IGR GPS clock combination summary report. igr15385.erp Earth Rotation Parameters (ERP) and their rates as well as Universal Time (UT1-UTC) and Length Of Day (LOD) associated with IGS ephemerides. igr15385.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 | ALL | 1 5 | EMR | 30 32 WTZR 5 | ESA | HARB SYOG 5 | GFZ | 16 FAA1 ONSA STJO UNSA 5 | JPL | 30 32 AREQ 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 1.1538.5 GPS week: 1538 Day: 5 MJD: 55015.000 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| -17 0 32 195 -1400 -3748-25.78 945 945 | -29 96 2509 4580 cod 124| 0 0 0 4 0 -56 -.15 9 8 | 370 -1823 25 74 emr 45| 0 -2 -2 -11 -71 30 .40 19 19 | 5388 -3235 17 70 esa 94| -1 0 0 20 49 17 .37 10 10 | 967 125 17 92 gfz 97| 0 2 1 13 -33 -13 -.15 10 10 | 368 -248 27 108 iga n/a| 1 0 0 -44 -16 33 .00 8 7 | -81 182 26 84 igu n/a| 0 0 3 -276 48 -181 .06 73 79 | -76 191 1062 1996 jpl 80| 0 0 -11 21 8 1 .65 18 17 | 4674 -3101 14 77 ngs 156| 0 0 2 -31 -7 -66 -.32 12 10 | -21 104 1917 3842 sio 68| 1 0 7 72 47 42 -.35 15 14 | 0 0 0 0 usn 32| 2 -2 -5 -104 -8 116 .06 15 14 | 93 -1772 52 114 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 2.1538.5 GPS week: 1538 Day: 5 MJD: 55015.000 Weighted Average PRN | brd cod emr esa gfz iga igu jpl ngs sio usn IGR | ------+-------------------------------------------------------------+ X1E | 1225 22 --- 28 --- --- --- --- 42 --- --- 21 | 2 | 621 8 24 9 8 6 21 18 14 13 14 5 | 3 | 1240 8 14 8 9 6 62 14 7 15 14 4 | 4 | 461 9 13 12 8 6 14 13 11 13 15 4 | 6 | 670 8 14 6 8 5 23 13 7 16 15 4 | 7 | 367 6 20 9 11 6 19 16 12 18 14 4 | 8 | 1236 7 16 5 6 7 15 14 9 11 9 3 | 9 | 1182 8 14 6 11 8 23 13 11 8 15 4 | 10 | 620 9 20 7 13 8 64 14 9 12 12 4 | 11 | 875 11 17 13 12 6 62 18 11 12 10 4 | 12E | 486 15 22 8 10 10 22 23 12 11 16 5 | 13 | 1134 7 22 13 8 5 20 22 11 18 13 5 | 14 | 819 7 22 13 10 8 27 15 18 22 16 5 | 15 | 836 10 19 11 9 8 23 18 11 8 9 4 | 16E | 811 7 18 13 11 4 18 21 10 11 18 5 | 17 | 265 16 21 8 19 7 20 24 15 12 16 6 | 18 | 986 8 22 13 8 7 60 20 8 13 15 5 | 19 | 438 7 18 13 8 6 26 22 8 17 10 4 | 20 | 1243 8 27 8 8 5 24 17 10 15 12 4 | 21 | 744 7 17 10 10 4 16 17 10 12 12 4 | 22 | 753 5 15 10 8 5 26 11 10 18 15 4 | 23 | 473 10 25 11 11 5 20 27 11 8 15 5 | 24 | 849 6 14 10 8 7 15 12 10 11 11 3 | 25 | 1078 6 14 7 7 7 25 16 8 19 13 4 | 26 | 1022 8 14 7 6 7 21 16 11 14 9 3 | 27 | 1491 6 14 7 7 8 20 11 11 9 14 3 | 28E | 1123 11 20 10 12 8 39 22 17 12 12 5 | 29 | 586 11 18 9 10 6 31 21 10 11 16 4 | 30E | 746 14 20 14 14 8 39 21 15 37 14 7 | 31 | 423 7 23 11 14 10 21 16 15 13 15 5 | 32E | 2204 15 29 14 12 22 365 20 19 10 31 7 | ------+-------------------------------------------------------------+ RMS | 945 9 19 10 10 8 73 18 12 15 15 | WRMS | 945 8 19 10 10 7 79 17 10 14 14 | MEDI | 819 8 18 10 9 7 23 17 11 12 14 | 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 3.1538.5 GPS week: 1538 Day: 5 MJD: 55015.0 CENT| CLK EPO | BRUS | TOW2 | WILL | ----+----------+-------------------+-------------------+-------------------+ cod | cod 2946 | 9 9 26 | 7 9 29 | 9 6 21 | emr | emr 2874 | 9 11 32 | 13 18 81 | 9 8 23 | esa | esa 2976 | 9 11 25 | 6 6 29 | 10 7 20 | gfz | gfz 2862 | 10 13 26 | 7 9 29 | 12 7 25 | igr | igr 2872 | 9 11 22 | 5 6 31 | 9 7 20 | jpl | jpl 2874 | 9 10 25 | 7 13 36 | 8 7 16 | 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 4.1538.5 GPS week: 1538 Day: 5 MJD: 55015.500 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 | 4 -26 205 30 -19 | -3 33 emr uuuuu | 158 18 43 271 -7 | 6 43 esa uuuuu | -70 -48 -65 120 3 | -14 32 gfz uuuuu | 40 -19 -78 100 -22 | 5 31 iga xxxxx | 22 25 37 82 7 | -5 31 igu xxxxx | -41 216 139 270 52 | -47 59 jpl uuuuu | -13 -41 69 82 4 | -5 35 ngs uuuuu | -5 44 13 -53 -2 | -6 27 sio uuuuu | -75 -33 98 -505 -25 | 12 41 usn uuuuu | 34 100 38 -22 41 | -20 33