Author: AC Coordinator / NOAA NGS sum-file Version 2.0 Rapid IGS Orbit Combination - Week 1518 Day: 4 (Feb 12, 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: igr15184.sp3 IGR GPS ephemeris in SP3 format. igr15184.clk IGR GPS satellite and station clocks in RINEX format. igr15184.cls IGR GPS clock combination summary report. igr15184.erp Earth Rotation Parameters (ERP) and their rates as well as Universal Time (UT1-UTC) and Length Of Day (LOD) associated with IGS ephemerides. igr15184.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 ----+--------+--------------- 4 | COD | 10 4 | EMR | GODE 4 | ESA | JOZE NRIL SYOG TSKB YELL 4 | GFZ | 7 15 4 | JPL | 26 HARB PDEL TOW2 WILL 5. The following table lists all maneuvered satellites. The solutions from COD and ESA, which modeled the maneuver, are used for combination. An associated accuracy code of 0 (unknown) is given if only one AC is left (no redundancy). PRN | Date | Ref. NANU ----+------------+---------- G19 | 2009_02_12 | 2009004 6. 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. 7. 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. 8. 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 1.1518.4 GPS week: 1518 Day: 4 MJD: 54874.000 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| 6 117 11 -243 -1437 -3409-26.25 939 939 | 120 -71 2320 4784 cod 131| 0 0 1 9 4 -32 -.18 9 9 | -355 -297 26 127 emr 36| -4 -3 2 -32 -48 -97 .51 20 20 | 3376 -2157 16 109 esa 95| -1 1 -3 -26 -9 38 .28 10 10 | 445 -614 19 137 gfz 96| 0 -3 -2 -21 -48 -64 -.17 11 11 | 98 171 23 128 iga n/a| 0 1 0 -12 -46 90 .02 7 7 | 31 252 22 173 igu n/a| 1 0 1 -210 -5 83 -.02 33 31 | 456 1436 2140 3895 jpl 45| 2 1 5 22 -24 49 .52 23 23 | 4454 -2503 19 200 ngs 103| 0 2 0 1 -35 -4 -.46 14 12 | 76 175 2129 4337 sio 66| 1 0 2 69 119 60 -.05 21 19 | 0 0 0 0 usn 35| 1 1 3 30 140 159 .03 25 23 | -757 1403 106 200 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 2.1518.4 GPS week: 1518 Day: 4 MJD: 54874.000 Weighted Average PRN | brd cod emr esa gfz iga igu jpl ngs sio usn IGR | ------+-------------------------------------------------------------+ 2 | 364 11 17 9 17 6 19 32 10 28 19 6 | 3 | 925 11 23 10 15 6 32 14 14 31 30 6 | 4 | 1159 9 13 6 11 5 24 16 12 15 21 4 | 5 | 766 12 14 12 8 5 31 14 17 18 24 5 | 6 | 792 9 23 16 16 8 24 16 11 30 27 6 | 7 | 1135 8 22 7 7 6 33 30 15 27 29 6 | 8 | 1008 8 14 8 9 8 20 13 12 17 29 4 | 9 | 877 7 11 7 9 6 20 13 14 23 24 4 | 10 | 614 7 16 6 15 5 24 11 13 16 70 7 | 11 | 921 12 21 11 7 7 42 23 10 20 16 5 | 12 | 1095 10 28 15 13 4 26 23 15 15 21 6 | 13E | 803 9 20 6 8 8 62 24 17 17 19 5 | 14E | 689 9 24 7 12 8 85 20 16 16 20 5 | 15E | 223 9 22 8 18 5 15 26 14 40 16 7 | 16 | 852 9 27 9 12 7 25 30 12 13 27 6 | 17 | 382 8 22 9 6 6 17 29 12 18 16 5 | 18 | 915 7 20 7 12 7 20 23 12 15 11 4 | X19 | ---- 3 --- --- --- --- --- --- --- --- --- 0 | 20 | 1079 7 20 9 10 9 30 30 15 22 17 5 | 21 | 1244 8 17 13 8 5 12 38 13 20 16 6 | 22 | 683 7 27 8 10 6 31 22 11 22 13 5 | 23E | 437 7 23 11 12 7 41 26 16 19 10 5 | 24 | 852 5 16 8 8 5 35 12 9 18 16 4 | 25 | 999 5 15 8 8 8 49 16 14 13 22 4 | 26E | 793 17 22 11 13 10 31 19 27 15 21 6 | 27 | 1652 7 14 5 8 8 13 12 9 14 21 4 | 28 | 790 8 25 10 9 6 16 24 14 16 32 6 | 29 | 830 8 22 15 9 3 36 28 16 27 16 6 | 30 | 1947 8 21 8 10 4 24 15 14 19 25 5 | 31 | 652 14 23 14 10 11 31 29 13 14 24 6 | 32 | 746 6 18 10 5 7 14 20 14 18 17 4 | ------+-------------------------------------------------------------+ RMS | 939 9 20 10 11 7 33 23 14 21 25 | WRMS | 939 9 20 10 11 7 31 23 12 19 23 | MEDI | 830 8 21 9 10 6 25 22 14 18 21 | 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 3.1518.4 GPS week: 1518 Day: 4 MJD: 54874.0 CENT| CLK EPO | BRUS | TOW2 | WILL | ----+----------+-------------------+-------------------+-------------------+ cod | cod 2976 | ---- ---- ---- | ---- ---- ---- | ---- ---- ---- | emr | emr 2876 | 8 11 26 | 12 13 36 | 14 20 27 | esa | esa 2880 | 8 8 25 | 9 12 28 | 13 17 21 | gfz | gfz 2859 | 10 13 28 | 9 11 49 | 14 18 26 | igr | igr 2865 | 9 9 22 | 8 13 31 | 12 17 21 | jpl | jpl 2861 | 16 13 25 | 21 12 37 | 15 19 35 | 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 4.1518.4 GPS week: 1518 Day: 4 MJD: 54874.500 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 | 16 -8 149 96 15 | -3 24 emr uuuuu | 65 11 -130 27 48 | 44 50 esa uuuuu | 3 43 -44 13 -17 | 7 24 gfz uuuuu | 44 7 30 -61 18 | 4 26 iga xxxxx | 55 25 0 84 4 | 6 24 igu xxxxx | 46 233 56 300 -31 | 34 61 jpl uuuuu | 47 -33 214 225 40 | -25 37 ngs uuuuu | 12 8 24 -70 -19 | -4 38 sio uuxxx | -99 -57 -313 15 65 | 26 44 usn uuuuu | -156 -77 -66 -5 -25 | 18 28