Author: AC Coordinator / NOAA NGS sum-file Version 2.0 Rapid IGS Orbit Combination - Week 1501 Day: 3 (Oct 15, 2008) 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: igr15013.sp3 IGR GPS ephemeris in SP3 format. igr15013.clk IGR GPS satellite and station clocks in RINEX format. igr15013.cls IGR GPS clock combination summary report. igr15013.erp Earth Rotation Parameters (ERP) and their rates as well as Universal Time (UT1-UTC) and Length Of Day (LOD) associated with IGS ephemerides. igr15013.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 ----+--------+--------------- 3 | ESA | AREQ HARB JOZE KARR NRIL TSKB YELL 3 | GFZ | 7 BOR1 HARB ONSA 3 | JPL | AREQ SANT 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 ----+------------+---------- G29 | 2008_10_15 | 2008129 G29 | 2008_10_16 | 2008129 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 1.1501.3 GPS week: 1501 Day: 3 MJD: 54754.000 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| 133 -25 73 -67 1795 -1120-23.76 959 959 | -343 366 2468 4986 cod 133| 0 1 3 -29 28 -41 -.35 12 12 | -917 703 27 100 emr 45| -2 -3 6 -44 -63 8 .28 16 16 | 980 -941 15 93 esa 95| 0 -1 -3 18 24 7 .28 12 12 | -1911 4127 20 81 gfz 93| 0 0 -4 -16 -39 -53 -.20 14 14 | -100 -40 27 92 iga n/a| 0 1 2 -15 21 -11 -.13 9 9 | -280 236 37 157 igu n/a| 1 2 -2 -155 324 -56 -.15 31 32 | -210 -3254 2838 4764 jpl 45| 0 1 0 30 7 47 .34 22 22 | 3184 -797 22 107 ngs 101| 0 1 -1 -3 -13 39 -.34 15 13 | -342 365 2306 4584 sio 71| 6 -2 3 26 33 72 -.05 25 25 | 0 0 0 0 usn 44| 1 0 -6 183 85 -36 .02 35 31 | 1903 -741 67 1900 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 2.1501.3 GPS week: 1501 Day: 3 MJD: 54754.000 Weighted Average PRN | brd cod emr esa gfz iga igu jpl ngs sio usn IGR | ------+-------------------------------------------------------------+ X1 | 1383 54 --- --- --- --- --- --- 82 --- 79 48 | 2 | 1011 13 18 13 12 9 30 16 18 33 23 6 | 3 | 1381 8 12 9 9 7 43 15 12 29 33 5 | 4 | 1225 13 13 9 16 9 22 14 18 15 27 5 | 5 | 825 12 11 6 13 9 36 21 9 15 34 5 | 6 | 1174 7 11 9 10 6 17 15 11 29 29 5 | 7 | 1501 13 19 14 14 11 33 18 13 21 86 8 | 8 | 1452 10 13 9 13 8 13 12 10 25 27 5 | 9 | 533 18 16 9 13 12 16 25 12 33 27 6 | 10 | 703 14 15 9 8 9 39 15 17 13 32 5 | 11E | 762 14 17 10 11 9 56 22 11 25 27 6 | 12 | 393 18 13 11 12 13 31 66 14 22 26 9 | 13 | 761 9 14 12 16 7 29 20 11 17 29 5 | 14 | 716 12 18 14 16 9 32 19 19 26 48 7 | 15 | 625 12 18 17 15 10 16 24 12 22 28 6 | 16 | 811 9 11 15 12 9 41 17 13 28 38 6 | 17 | 605 13 18 14 17 9 24 19 16 28 34 6 | 18 | 927 13 19 15 17 9 26 25 18 20 43 7 | 19 | 585 13 20 15 15 10 13 22 17 29 30 7 | 20 | 755 16 22 14 17 10 37 31 14 27 33 7 | 21 | 658 10 19 15 14 8 22 19 20 41 34 7 | 22 | 1086 14 15 14 17 9 29 26 18 26 39 7 | 23 | 879 11 18 13 13 8 45 18 12 26 34 6 | 24 | 1144 13 16 12 13 9 47 14 19 28 25 6 | 25 | 1135 12 12 10 13 6 13 13 11 19 28 5 | 26 | 765 14 16 11 13 8 34 16 17 25 24 6 | 27 | 1454 12 12 9 13 5 25 13 14 21 25 5 | 28 | 1107 10 17 13 16 8 31 17 15 16 24 5 | X29 | ---- 8 --- 7 --- 13 23 --- --- --- --- 8 | 30 | 875 10 10 7 17 7 36 16 7 15 33 5 | 31 | 551 11 17 11 15 8 28 26 14 38 33 7 | 32 | 992 8 16 6 8 6 15 15 13 22 48 5 | ------+-------------------------------------------------------------+ RMS | 959 12 16 12 14 9 31 22 15 25 35 | WRMS | 959 12 16 12 14 9 32 22 13 25 31 | MEDI | 875 12 16 11 13 9 29 18 14 25 32 | 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 3.1501.3 GPS week: 1501 Day: 3 MJD: 54754.0 CENT| CLK EPO | BRUS | TOW2 | WILL | ----+----------+-------------------+-------------------+-------------------+ cod | cod 3067 | 9 11 22 | ---- ---- ---- | 7 7 11 | emr | emr 2880 | 11 13 28 | ---- ---- ---- | 9 7 22 | esa | esa 2880 | 9 10 22 | ---- ---- ---- | 6 6 14 | gfz | gfz 2876 | 10 14 24 | ---- ---- ---- | 10 11 27 | igr | igr 2969 | 9 11 22 | ---- ---- ---- | 8 12 36 | jpl | jpl 2879 | 14 11 30 | ---- ---- ---- | 11 6 21 | 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 4.1501.3 GPS week: 1501 Day: 3 MJD: 54754.500 AC LOD AC LOD CENT FLAG | Xpole Ypole Xrt Yrt LOD | BIAS BIAS RMS | [uas] [uas] [uas/d] [uas/d] [us]| [us] [us] ------------+----------------------------------------+------------------ cod uuuuu | -31 3 60 -15 0 | 9 12 emr uuuuu | 58 43 -161 -148 -17 | 65 65 esa uuuuu | -56 -36 166 45 12 | 25 26 gfz uuuuu | -1 -6 124 -85 11 | 15 17 iga xxxxx | -5 11 119 -79 1 | 4 6 igu xxxxx | -157 13 -67 -95 -31 | -18 33 jpl uuuuu | 25 -34 -219 57 -3 | 1 9 ngs uuuuu | 22 43 79 99 -2 | 20 27 sio uuuuu | 40 44 -480 199 11 | 85 86 usn uuuuu | -8 -121 117 -36 -36 | 35 50