Author: AC Coordinator / NOAA NGS sum-file Version 2.0 Rapid IGS Orbit Combination - Week 1512 Day: 6 (Jan 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: igr15126.sp3 IGR GPS ephemeris in SP3 format. igr15126.clk IGR GPS satellite and station clocks in RINEX format. igr15126.cls IGR GPS clock combination summary report. igr15126.erp Earth Rotation Parameters (ERP) and their rates as well as Universal Time (UT1-UTC) and Length Of Day (LOD) associated with IGS ephemerides. igr15126.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 ----+--------+--------------- 6 | COD | 5 10 MIZU 6 | EMR | 7 30 6 | ESA | 5 10 6 | GFZ | 7 32 ONSA 6 | JPL | 10 30 32 AUCK DAEJ SANT 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 ----+--------+--------------- 6 | USN | 1 15 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 1.1512.6 GPS week: 1512 Day: 6 MJD: 54834.000 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| -44 1 56 -214 -545 -4240-26.91 853 853 | 168 -182 2555 4266 cod 127| 0 2 1 -8 68 -19 -.24 11 10 | -323 97 19 96 emr 45| 0 -1 -2 -65 -3 -45 .29 19 18 | 740 1281 17 89 esa 95| 0 0 -2 43 0 39 .26 11 11 | 100 -70 14 80 gfz 88| 0 -1 -5 -20 -88 5 -.16 15 15 | 268 -232 22 106 iga n/a| 2 1 -2 16 5 -111 -.11 10 8 | 158 -179 59 172 igu n/a| 0 0 -4 -121 -440 -61 -.09 76 47 | 203 -289 3082 5190 jpl 45| -2 -2 15 11 -21 -71 .47 21 21 | 731 1332 20 163 ngs 85| 0 0 0 -39 -71 -18 -.29 13 12 | 155 -164 2287 3847 sio 59| 1 4 -4 58 166 112 -.33 23 22 | 0 0 0 0 usn 41| -3 -6 -9 138 100 -68 -.07 132 32 | -772 1764 87 1820 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 2.1512.6 GPS week: 1512 Day: 6 MJD: 54834.000 Weighted Average PRN | brd cod emr esa gfz iga igu jpl ngs sio usn IGR | ------+-------------------------------------------------------------+ X1 | 860 5 --- --- --- --- --- --- --- --- 932 0 | 2 | 978 8 18 12 13 9 32 23 10 26 55 6 | 3 | 1044 9 16 12 13 8 31 10 14 15 30 5 | 4 | 476 10 17 7 8 6 27 23 9 36 28 6 | 5E | 571 13 18 10 17 10 25 15 13 15 24 5 | 6 | 726 9 15 12 10 8 34 11 12 17 23 4 | 7 | 343 9 26 11 23 8 33 19 12 19 55 7 | 8 | 1110 8 13 8 13 9 19 15 13 28 26 5 | 9 | 1385 9 12 9 9 6 23 12 14 17 25 4 | 10E | 600 16 21 11 20 17 110 17 19 21 37 7 | 11 | 861 9 16 10 14 8 25 26 11 26 53 6 | 12E | 1182 14 19 13 25 13 64 22 11 18 36 6 | 13 | 761 9 18 9 11 6 17 17 10 21 35 5 | 14 | 826 10 26 11 11 8 17 21 16 23 55 7 | 15 | 810 10 24 14 15 8 15 19 10 18 700 6 | 16E | 595 8 19 12 13 10 63 25 14 27 35 6 | 17 | 489 14 14 12 17 9 37 24 14 26 46 7 | 18E | 1127 13 20 10 20 11 61 19 13 22 31 6 | 19 | 710 11 15 12 14 8 19 20 13 16 48 6 | 20E | 1178 11 17 10 21 10 28 28 11 21 50 7 | 21 | 744 10 18 9 16 9 23 47 11 26 39 8 | 22E | 526 10 17 14 12 8 19 22 13 17 27 5 | 23 | 650 11 22 9 17 7 22 18 9 20 37 6 | 24 | 923 6 14 4 9 6 19 13 12 18 37 4 | 25 | 1103 8 11 10 11 8 15 14 12 24 20 4 | 26 | 658 9 13 12 9 7 36 13 14 18 27 5 | 27 | 756 8 14 8 12 7 34 13 13 30 35 5 | 28 | 1107 10 19 10 16 9 32 21 20 23 94 8 | 29 | 448 10 18 9 11 8 46 23 10 24 38 6 | 30E | 629 20 24 14 13 19 207 20 16 27 29 7 | 31 | 859 13 20 10 8 7 20 25 10 24 57 6 | 32E | 1062 19 26 8 14 20 307 25 16 20 44 7 | ------+-------------------------------------------------------------+ RMS | 853 11 19 11 15 10 76 21 13 23 132 | WRMS | 853 10 18 11 15 8 47 21 12 22 32 | MEDI | 761 10 18 10 13 8 28 20 13 21 37 | 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 3.1512.6 GPS week: 1512 Day: 6 MJD: 54834.0 CENT| CLK EPO | BRUS | WILL | ----+----------+-------------------+-------------------+ cod | cod 3060 | 6 5 15 | 12 8 24 | emr | emr 2960 | 15 12 36 | 12 8 26 | esa | esa 2976 | 6 6 19 | 11 9 24 | gfz | gfz 2945 | 13 11 32 | 12 12 34 | igr | igr 2964 | 14 10 31 | 11 8 26 | jpl | jpl 2956 | 23 14 58 | 19 11 33 | 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 4.1512.6 GPS week: 1512 Day: 6 MJD: 54834.500 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 | -106 10 -85 -43 -14 | -6 20 emr uuuuu | -41 48 -207 141 -22 | 31 39 esa uuuuu | -8 -36 180 224 11 | -15 29 gfz uuuuu | 70 16 -73 -63 15 | -20 31 iga xxxxx | -39 -15 13 -15 -6 | -3 19 igu xxxxx | 426 107 566 -21 61 | -30 47 jpl uuuuu | -26 -13 -2 54 -18 | -3 26 ngs uuuuu | 35 40 -8 -391 13 | -19 29 sio uuxxu | -49 -69 16 66 13 | 20 29 usn uuuuu | -37 -6 33 -72 -34 | 18 44