Author: AC Coordinator / NOAA NGS sum-file Version 2.0 Rapid IGS Orbit Combination - Week 1514 Day: 5 (Jan 16, 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: igr15145.sp3 IGR GPS ephemeris in SP3 format. igr15145.clk IGR GPS satellite and station clocks in RINEX format. igr15145.cls IGR GPS clock combination summary report. igr15145.erp Earth Rotation Parameters (ERP) and their rates as well as Universal Time (UT1-UTC) and Length Of Day (LOD) associated with IGS ephemerides. igr15145.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 | JOZE 5 | GFZ | 7 16 5 | JPL | 5 11 30 MATE 5. The following orbit solutions were excluded from the combination because they were biasing the weighted average. They were still used for statistics computation unless all centres were excluded for the problem satellites in which case they were simply eliminated from the combination and statistics. The following table lists the exclusions: Day | Centre | PRN list ----+--------+--------------- 5 | JPL | 11 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 1.1514.5 GPS week: 1514 Day: 5 MJD: 54847.000 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| -163 32 -3 1921 -463 -2830-28.22 926 926 | -111 194 2402 4672 cod 125| -1 1 -1 24 12 -7 -.17 9 9 | -191 -433 27 130 emr 45| 1 2 3 -113 -60 -66 .34 21 21 | 828 520 14 102 esa 95| 1 -1 -1 -12 32 11 .28 9 9 | -2509 4980 14 85 gfz 94| -1 -1 0 -12 -38 -86 -.06 11 11 | 187 104 19 112 iga n/a| 0 0 0 -28 3 139 .06 6 6 | -75 120 19 119 igu n/a| 0 1 -1 366 -202 208 .09 36 29 | 210 -991 1967 4416 jpl 45| 0 -1 10 -2 -106 -46 .52 32 32 | 1658 429 21 137 ngs 95| 0 0 0 -60 -43 42 -.45 14 12 | -83 151 2106 4033 sio 67| 1 -1 -2 -2 60 108 -.25 24 19 | 0 0 0 0 usn 40| 2 0 -1 177 95 49 .06 14 13 | -962 1809 80 177 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 2.1514.5 GPS week: 1514 Day: 5 MJD: 54847.000 Weighted Average PRN | brd cod emr esa gfz iga igu jpl ngs sio usn IGR | ------+-------------------------------------------------------------+ 2 | 532 5 14 7 7 6 30 30 8 17 10 4 | 3 | 1427 9 16 9 8 5 10 16 11 30 11 5 | 4 | 571 7 12 8 8 4 35 11 9 12 13 3 | 5E | 931 19 30 12 16 13 92 24 33 65 22 10 | 6 | 829 7 16 6 9 6 42 14 13 34 10 5 | 7 | 755 10 21 10 10 6 19 23 13 12 15 5 | 8 | 908 10 14 9 8 6 21 14 9 10 18 4 | 9 | 1271 10 18 6 9 4 19 16 14 20 18 5 | 10 | 486 9 24 9 12 7 19 16 10 13 8 4 | 11 | 891 9 20 10 17 6 43 118 12 17 15 5 | 12E | 437 9 24 10 11 6 50 29 8 24 16 5 | 13 | 787 8 20 7 10 5 27 23 10 18 13 4 | 14 | 793 9 24 11 12 7 23 23 11 22 15 5 | 15 | 374 9 28 9 9 5 22 29 17 20 8 5 | 16E | 1164 8 17 10 11 8 25 25 12 18 17 5 | 17 | 975 8 20 8 13 5 21 31 12 17 11 5 | 18 | 837 6 21 7 8 5 17 26 12 12 12 4 | 19 | 1698 6 19 8 11 5 16 31 14 12 11 5 | 20 | 969 10 24 6 10 8 15 37 8 16 12 5 | 21 | 1087 7 14 6 8 3 23 30 11 15 10 4 | 22 | 444 10 20 9 9 6 16 19 12 20 12 5 | 23 | 422 10 25 9 11 6 19 28 7 21 14 5 | 24 | 558 7 15 5 8 4 28 11 12 10 6 3 | 25 | 907 10 13 7 4 5 13 18 13 11 16 4 | 26 | 869 11 16 7 11 6 42 16 17 17 12 4 | 27 | 1530 9 15 7 9 6 23 16 12 15 13 4 | 28E | 1298 8 16 9 9 4 31 25 10 13 8 4 | 29 | 504 10 24 9 8 6 41 32 11 11 17 5 | 30E | 912 14 38 16 20 12 100 27 31 65 22 11 | 31 | 825 9 23 10 11 7 20 29 14 16 14 5 | 32 | 827 11 28 10 16 7 21 20 14 11 17 5 | ------+-------------------------------------------------------------+ RMS | 926 9 21 9 11 6 36 32 14 24 14 | WRMS | 926 9 21 9 11 6 29 32 12 19 13 | MEDI | 837 9 20 9 10 6 23 24 12 17 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 3.1514.5 GPS week: 1514 Day: 5 MJD: 54847.0 CENT| CLK EPO | BRUS | TOW2 | WILL | ----+----------+-------------------+-------------------+-------------------+ cod | cod 2976 | 12 16 33 | 9 9 30 | 17 16 43 | emr | emr 2968 | 16 13 32 | 11 9 38 | 15 13 28 | esa | esa 2976 | 9 10 26 | 10 12 27 | 14 16 29 | gfz | gfz 2958 | 11 11 31 | 10 12 37 | 16 19 29 | igr | igr 2975 | 9 11 27 | 9 7 28 | 15 16 30 | jpl | jpl 2966 | 14 12 26 | 9 13 32 | 20 17 48 | 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 4.1514.5 GPS week: 1514 Day: 5 MJD: 54847.500 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 | -18 -33 -161 104 11 | -4 17 emr uuuuu | 87 68 49 141 13 | 19 36 esa uuuuu | -57 23 -14 -205 -17 | -3 19 gfz uuuuu | 21 13 -83 66 19 | 5 18 iga xxxxx | -34 47 -35 -37 17 | 0 18 igu xxxxx | 233 -373 303 -393 30 | 22 32 jpl uuuuu | 129 1 -31 252 -8 | 0 24 ngs uuuuu | 85 66 113 -101 -13 | 1 16 sio uuxxu | -58 16 -137 -357 17 | 23 39 usn uuuuu | -99 -187 -1 172 7 | -1 16