Author: AC Coordinator / NOAA NGS sum-file Version 2.0 Rapid IGS Orbit Combination - Week 1535 Day: 0 (Jun 07, 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: igr15350.sp3 IGR GPS ephemeris in SP3 format. igr15350.clk IGR GPS satellite and station clocks in RINEX format. igr15350.cls IGR GPS clock combination summary report. igr15350.erp Earth Rotation Parameters (ERP) and their rates as well as Universal Time (UT1-UTC) and Length Of Day (LOD) associated with IGS ephemerides. igr15350.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 ----+--------+--------------- 0 | COD | 8 10 0 | EMR | WTZR 0 | ESA | 8 10 IISC MKEA SYOG 0 | GFZ | 32 WTZR 0 | JPL | 32 0 | USN | IISC 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 ----+--------+--------------- 0 | NGS | 1 0 | USN | 5 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 1.1535.0 GPS week: 1535 Day: 0 MJD: 54989.000 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| 62 -7 -46 -616 -621 -4014-23.72 999 999 | 60 -71 2353 4095 cod 125| 1 -1 2 -7 17 -43 -.24 9 8 | -331 -424 24 83 emr 45| -1 4 -4 -110 -57 -23 .21 21 21 | 2274 189 17 78 esa 95| 0 -1 1 -2 69 40 .34 11 10 | -2918 1109 16 95 gfz 91| -1 -1 0 11 -14 24 -.14 15 15 | -22 -26 26 87 iga n/a| 0 0 0 -10 10 2 -.01 8 7 | 14 -5 25 110 igu n/a| 1 -4 3 123 188 -187 -.08 76 67 | 45 -61 1826 4110 jpl 80| -2 4 -6 -42 17 114 .38 20 18 | 1759 201 19 94 ngs 135| 1 0 -3 37 22 -110 -.27 13 12 | 22 -49 2035 3580 usn 35| 0 -2 6 130 -171 78 -.05 21 19 | -446 -1294 56 121 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 2.1535.0 GPS week: 1535 Day: 0 MJD: 54989.000 Weighted Average PRN | brd cod emr esa gfz iga igu jpl ngs usn IGR | ------+--------------------------------------------------------+ X1 |85131 5 --- --- --- --- --- --- 161 --- 0 | 2 | 1123 7 21 11 10 8 20 25 10 15 5 | 3 | 1035 9 7 11 16 4 59 10 12 21 5 | 4 | 925 5 13 6 9 8 13 18 11 26 5 | X5 | 697 15 --- --- --- 71 68 --- 25 >>>> 19 | 6 | 1913 10 9 11 17 4 45 10 14 18 5 | 7E | 540 16 20 12 22 15 114 23 13 23 7 | 8E | 1238 10 22 11 21 19 119 23 14 27 6 | 9 | 1068 9 23 10 9 6 27 19 13 15 5 | 10E | 1073 12 14 16 16 13 125 21 20 16 6 | 11 | 983 8 18 6 11 8 33 20 11 18 5 | 12 | 560 7 20 10 12 6 37 22 14 15 5 | 13 | 904 7 18 15 14 7 12 24 10 17 5 | 14 | 1031 7 26 9 13 7 23 21 12 22 6 | 15 | 644 7 18 9 8 7 24 21 13 23 5 | 16 | 792 10 26 12 12 5 23 23 10 18 6 | 17 | 168 7 17 12 30 9 21 17 16 42 8 | 18E | 1265 7 19 9 13 4 22 18 10 29 5 | 19 | 293 7 11 10 19 5 33 17 13 20 5 | 20E | 760 8 22 12 12 7 25 20 13 14 5 | 21 | 657 9 20 9 11 6 13 20 13 20 5 | 22E | 1097 7 24 10 12 5 31 21 11 11 5 | 23 | 389 9 22 11 11 7 23 27 9 15 5 | 24 | 1616 7 11 8 14 6 15 13 12 17 4 | 25 | 514 8 16 11 13 7 18 27 15 16 6 | 26 | 572 6 13 9 8 6 31 17 8 12 4 | 27 | 1569 9 24 14 9 5 14 18 13 16 6 | 28 | 1573 7 21 9 13 8 28 20 14 29 6 | 29 | 262 7 14 8 21 4 19 15 18 12 5 | 30 | 787 8 17 11 14 5 17 16 9 24 5 | 31E | 968 8 38 12 15 8 95 22 12 12 7 | 32E | 958 12 40 12 19 17 320 20 14 26 8 | ------+--------------------------------------------------------+ RMS | 999 9 21 11 15 8 76 20 13 21 | WRMS | 999 8 21 10 15 7 67 18 12 19 | MEDI | 925 8 19 11 13 7 25 20 13 18 | 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 3.1535.0 GPS week: 1535 Day: 0 MJD: 54989.0 CENT| CLK EPO | BRUS | TOW2 | ----+----------+-------------------+-------------------+ cod | cod 3066 | 7 6 24 | 6 8 21 | emr | emr 2868 | 12 12 27 | 8 12 39 | esa | esa 2880 | 8 7 24 | 6 10 24 | gfz | gfz 2849 | 9 9 38 | 14 18 51 | igr | igr 2870 | 8 6 25 | 6 15 30 | jpl | jpl 2868 | 10 8 28 | 7 13 36 | 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 4.1535.0 GPS week: 1535 Day: 0 MJD: 54989.500 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 | -31 19 124 -66 -8 | -1 20 emr uuuuu | 89 165 -124 -63 -26 | 37 51 esa uuuuu | -76 16 -61 11 -8 | 14 29 gfz uuuuu | -17 -24 126 -151 -10 | 18 32 iga xxxxx | -30 25 0 -84 -1 | -3 18 igu xxxxx | -199 -123 -85 -385 -42 | -16 42 jpl uuuuu | -35 43 -41 123 -7 | -5 35 ngs uuuuu | 10 -54 50 297 4 | 3 17 usn uuuuu | 124 -137 45 -395 4 | -7 14