Author: AC Coordinator / NOAA NGS sum-file Version 2.0 Rapid IGS Orbit Combination - Week 1504 Day: 4 (Nov 06, 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: igr15044.sp3 IGR GPS ephemeris in SP3 format. igr15044.clk IGR GPS satellite and station clocks in RINEX format. igr15044.cls IGR GPS clock combination summary report. igr15044.erp Earth Rotation Parameters (ERP) and their rates as well as Universal Time (UT1-UTC) and Length Of Day (LOD) associated with IGS ephemerides. igr15044.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 | 4 9 24 32 4 | EMR | MCM4 4 | ESA | 4 9 24 32 DARW DAV1 JOZE SCH2 SYOG TIDB TSKB YSSK 4 | GFZ | 7 32 BOR1 CEDU DAV1 4 | JPL | 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 ----+--------+--------------- 4 | NGS | 1 4 | USN | 1 3 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 1.1504.4 GPS week: 1504 Day: 4 MJD: 54776.000 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| -95 16 76 -1249 581 -630-27.89 863 863 | 460 -728 2510 4184 cod 128| 1 0 3 -15 -22 -7 -.30 17 16 | 153 -929 26 159 emr 45| -2 1 3 -40 -56 9 .40 14 14 | -1809 -78 17 75 esa 95| 1 -4 -4 64 24 -14 .17 16 16 | -1652 3003 23 134 gfz 98| 0 0 0 -13 -17 10 -.14 15 15 | 440 -358 27 147 iga n/a| 2 1 0 -78 10 129 -.17 16 12 | 360 -638 79 225 igu n/a| 2 0 5 -145 -409 207 -.26 83 60 | 368 -643 2281 4004 jpl 45| -1 1 2 -43 65 -33 .38 16 16 | -1793 -74 19 180 ngs 105| 0 -1 0 -12 -54 13 -.54 17 16 | 427 -684 2129 3621 sio 71| 2 -2 -2 71 56 10 -.36 24 21 | 0 0 0 0 usn 45| 0 2 -12 104 102 -41 -.14 42 32 | -1711 274 90 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 2.1504.4 GPS week: 1504 Day: 4 MJD: 54776.000 Weighted Average PRN | brd cod emr esa gfz iga igu jpl ngs sio usn IGR | ------+-------------------------------------------------------------+ X1 | 1072 5 --- --- --- --- --- --- 360 --- 242 0 | 2E | 709 17 20 15 15 11 26 14 17 22 24 6 | 3 | 931 10 10 10 10 9 79 9 12 14 117 4 | 4E | 726 25 15 16 20 54 277 31 39 66 38 12 | 5 | 760 15 14 9 14 10 25 9 18 10 32 5 | 6 | 1000 9 9 12 10 9 17 9 13 15 36 4 | 7E | 1045 15 17 15 12 19 46 12 15 26 33 6 | 8 | 553 17 14 10 12 11 26 10 14 16 19 5 | 9E | 1002 29 20 15 12 20 201 12 19 23 23 7 | 10 | 1038 12 11 9 13 12 25 8 13 12 29 4 | 11 | 953 21 15 17 16 17 176 19 16 17 38 7 | 12 | 449 18 13 15 14 8 21 15 16 17 55 7 | 13 | 972 18 13 18 15 11 31 17 15 21 35 6 | 14 | 757 14 15 20 20 12 22 15 16 19 48 7 | 15 | 646 18 15 17 17 9 22 14 15 29 35 7 | 16 | 879 14 14 13 10 10 21 19 17 15 38 6 | 17 | 682 15 13 19 16 12 40 17 15 22 33 6 | 18 | 739 14 14 20 18 13 22 18 17 23 69 8 | 19 | 1051 17 15 15 14 12 23 20 17 21 43 7 | 20 | 717 17 17 23 16 14 31 20 20 25 38 7 | X21E | 756 11 16 15 14 14 25 --- 11 15 27 6 | 22 | 480 17 12 19 16 11 26 19 18 24 40 7 | 23 | 524 18 21 23 14 14 23 18 16 22 25 7 | 24E | 930 20 13 10 13 16 126 15 18 20 21 6 | 25E | 1799 18 14 17 15 16 112 12 18 28 24 6 | 26 | 731 16 12 12 12 8 40 10 12 23 35 5 | 27E | 822 18 15 11 13 18 66 14 20 22 22 6 | 28 | 839 13 11 17 14 11 52 19 15 25 51 7 | 29 | 442 24 13 19 15 11 26 19 17 30 45 8 | 30 | 694 12 10 11 18 11 41 8 17 10 28 5 | 31E | 855 14 14 15 15 11 19 17 16 15 36 6 | 32 | 1009 10 15 18 14 14 52 15 15 21 35 6 | ------+-------------------------------------------------------------+ RMS | 863 17 14 16 15 16 83 16 17 24 42 | WRMS | 863 16 14 16 15 12 60 16 16 21 32 | MEDI | 760 16 14 15 14 12 26 15 16 21 35 | 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 3.1504.4 GPS week: 1504 Day: 4 MJD: 54776.0 CENT| CLK EPO | BRUS | TOW2 | WILL | ----+----------+-------------------+-------------------+-------------------+ cod | cod 3072 | 8 7 29 | ---- ---- ---- | 90 104 189 | emr | emr 2956 | 11 10 26 | ---- ---- ---- | 86 103 185 | esa | esa 2976 | 8 9 23 | ---- ---- ---- | 86 104 183 | gfz | gfz 2942 | 9 12 26 | ---- ---- ---- | 83 104 179 | igr | igr 2932 | 8 8 37 | ---- ---- ---- | 169 147 244 | jpl | jpl 2855 | 14 16 33 | ---- ---- ---- | 75 90 170 | 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 4.1504.4 GPS week: 1504 Day: 4 MJD: 54776.500 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 | 8 1 19 -72 3 | 12 20 emr uuuuu | 25 9 -17 -207 13 | 57 59 esa uuuuu | 32 -55 -151 139 4 | 24 28 gfz uuuuu | -23 30 -80 322 -9 | 19 23 iga xxxxx | -9 57 92 121 -5 | 4 14 igu xxxxx | 394 141 669 155 -49 | -19 34 jpl uuuuu | -63 25 53 45 4 | -8 16 ngs uuuuu | 118 6 367 -171 -27 | 21 25 sio uuuuu | -49 -45 -154 -249 -30 | 77 78 usn uuuuu | -180 35 -64 245 18 | 2 24