Author: AC Coordinator / NOAA NGS sum-file Version 2.0 Rapid IGS Orbit Combination - Week 1513 Day: 0 (Jan 04, 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: igr15130.sp3 IGR GPS ephemeris in SP3 format. igr15130.clk IGR GPS satellite and station clocks in RINEX format. igr15130.cls IGR GPS clock combination summary report. igr15130.erp Earth Rotation Parameters (ERP) and their rates as well as Universal Time (UT1-UTC) and Length Of Day (LOD) associated with IGS ephemerides. igr15130.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 | 10 0 | EMR | 5 30 0 | ESA | 10 JOZE THU3 TSKB 0 | GFZ | 5 7 32 0 | JPL | 5 10 30 32 ASPA LPGS ULAB 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 | USN | 2 28 29 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 1.1513.0 GPS week: 1513 Day: 0 MJD: 54835.000 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| -24 -70 12 723 -2168 -3548-25.77 885 885 | -93 79 2764 4611 cod 126| 0 0 2 -9 34 1 -.28 11 10 | 9 -447 20 111 emr 45| -1 -1 2 -68 -18 -51 .21 19 19 | 2025 -93 13 89 esa 95| 0 0 -3 8 -1 28 .19 9 9 | -122 1089 15 103 gfz 84| 1 -3 -7 28 -57 -13 -.20 19 19 | 291 -569 21 122 iga n/a| 0 0 -1 53 -38 -72 -.12 10 8 | -219 134 40 105 igu n/a| 0 0 0 -146 -83 -355 -.12 118 69 | -4 -1191 1767 2585 jpl 45| 0 2 14 -110 -10 -73 .42 20 20 | 1851 242 17 176 ngs 83| -2 0 -1 35 -64 2 -.31 15 14 | -137 114 2364 4013 sio 59| 3 -1 -8 210 156 176 -.30 29 28 | 0 0 0 0 usn 41| -4 -4 -7 198 73 25 -.09 103 34 | 841 167 89 1908 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 2.1513.0 GPS week: 1513 Day: 0 MJD: 54835.000 Weighted Average PRN | brd cod emr esa gfz iga igu jpl ngs sio usn IGR | ------+-------------------------------------------------------------+ X1 | 1309 5 --- --- --- --- --- --- --- --- --- 0 | 2 | 970 9 17 7 20 7 34 21 20 20 351 6 | 3 | 873 11 16 9 17 11 138 14 15 29 29 5 | 4 | 1339 6 12 8 13 8 22 14 17 25 33 5 | 5E | 814 13 19 9 18 9 17 15 14 28 30 6 | 6 | 875 8 16 8 12 11 18 11 11 21 30 4 | 7 | 493 9 17 6 24 7 18 18 14 30 42 6 | 8 | 996 10 13 8 15 7 23 16 12 29 28 5 | 9 | 679 11 13 7 13 6 32 14 17 31 48 6 | 10E | 1573 16 28 9 21 21 234 17 18 37 22 7 | 11 | 892 7 17 9 15 5 38 25 15 29 77 7 | 12E | 1241 11 21 12 21 9 51 22 11 30 35 6 | 13 | 866 8 18 9 23 6 19 24 11 35 37 6 | 14 | 937 9 22 13 12 5 32 24 14 29 43 7 | 15 | 267 12 21 12 12 8 25 25 16 22 42 6 | 16E | 652 11 29 12 43 12 69 27 14 26 34 8 | 17 | 553 11 14 10 26 11 42 20 13 25 42 6 | 18E | 799 12 23 12 32 9 47 21 15 26 46 7 | 19 | 400 7 15 9 22 7 20 23 12 20 39 6 | 20 | 1031 16 17 7 19 10 47 24 17 24 69 7 | 21 | 690 9 14 10 18 8 30 19 15 30 55 6 | 22E | 379 12 22 12 13 12 25 21 22 31 29 7 | 23 | 729 10 20 9 24 10 24 21 15 34 31 6 | 24 | 939 6 11 9 11 6 21 16 15 29 22 5 | 25 | 1078 11 14 7 16 6 17 13 16 34 24 5 | 26 | 1446 8 17 7 9 6 51 14 11 25 22 4 | 27 | 730 9 11 7 12 8 20 17 13 31 29 5 | 28E | 914 8 18 9 15 14 187 19 18 30 266 6 | 29 | 671 10 18 9 14 5 55 24 10 29 299 6 | 30E | 838 14 23 8 19 15 380 19 16 29 30 6 | 31 | 411 12 20 12 14 7 29 19 15 31 41 6 | 32E | 774 24 33 10 21 21 381 19 19 34 48 8 | ------+-------------------------------------------------------------+ RMS | 885 11 19 9 19 10 118 20 15 29 103 | WRMS | 885 10 19 9 19 8 69 20 14 28 34 | MEDI | 838 10 17 9 17 8 32 19 15 29 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 3.1513.0 GPS week: 1513 Day: 0 MJD: 54835.0 CENT| CLK EPO | BRUS | WILL | ----+----------+-------------------+-------------------+ cod | cod 3066 | 7 9 20 | 13 12 24 | emr | emr 2960 | 18 17 45 | 11 9 27 | esa | esa 2976 | 9 10 25 | 11 11 26 | gfz | gfz 2943 | 19 15 37 | 18 17 41 | igr | igr 2943 | 18 16 35 | 11 11 30 | jpl | jpl 2959 | 20 18 43 | 12 8 40 | 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 4.1513.0 GPS week: 1513 Day: 0 MJD: 54835.500 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 | -57 4 -137 -80 -11 | 0 21 emr uuuuu | -18 30 25 -59 -17 | 35 43 esa uuuuu | -6 -21 160 -58 -8 | -7 32 gfz uuuuu | 68 -49 -130 39 23 | -16 30 iga xxxxx | 16 -46 -69 -27 -9 | 1 21 igu xxxxx | 45 188 -416 271 40 | -24 46 jpl uuuuu | -5 81 175 -27 -5 | -3 26 ngs uuuuu | 18 40 -372 162 24 | -15 28 sio uuxxu | -122 -113 34 -755 -19 | 22 30 usn uuuuu | 47 -75 -66 -5 -24 | 26 48