Author: AC Coordinator / NOAA NGS sum-file Version 2.0 Rapid IGS Orbit Combination - Week 1519 Day: 3 (Feb 18, 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: igr15193.sp3 IGR GPS ephemeris in SP3 format. igr15193.clk IGR GPS satellite and station clocks in RINEX format. igr15193.cls IGR GPS clock combination summary report. igr15193.erp Earth Rotation Parameters (ERP) and their rates as well as Universal Time (UT1-UTC) and Length Of Day (LOD) associated with IGS ephemerides. igr15193.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 | COD | 3 26 3 | EMR | 6 3 | ESA | 3 26 NICO ONSA SYOG TSKB 3 | GFZ | 7 13 14 23 HARB MATE ONSA SCH2 3 | JPL | THU3 ZWE2 3 | USN | ONSA 5. 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. 6. 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. 7. 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 1.1519.3 GPS week: 1519 Day: 3 MJD: 54880.000 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| 47 46 -57 291 1079 -4351-24.35 895 895 | -179 203 2797 4597 cod 131| 0 -1 3 -37 48 -79 -.13 10 9 | 358 -1481 20 126 emr 45| 0 0 6 -97 -83 -78 .44 20 20 | 772 1191 11 154 esa 95| -1 0 -3 1 48 -5 .25 10 10 | 393 -594 20 149 gfz 93| 0 -3 -8 11 -88 57 -.18 14 14 | -112 378 21 123 iga n/a| 0 1 0 3 4 6 .02 9 8 | -223 266 26 165 igu n/a| 2 1 0 189 89 -407 -.06 42 36 | -355 511 2040 4319 jpl 80| 3 -1 6 -48 -44 -41 .50 20 20 | 1662 1103 19 118 ngs 95| -1 1 -1 36 -4 -28 -.30 10 10 | -181 206 2273 3825 sio 62| 3 0 1 96 49 94 -.28 22 21 | 0 0 0 0 usn 35| 0 2 2 45 4 172 -.02 18 17 | -268 -1220 67 171 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 2.1519.3 GPS week: 1519 Day: 3 MJD: 54880.000 Weighted Average PRN | brd cod emr esa gfz iga igu jpl ngs sio usn IGR | ------+-------------------------------------------------------------+ 2 | 139 7 21 13 14 8 14 23 9 24 18 5 | 3E | 921 11 17 12 21 9 148 17 11 18 13 5 | 4 | 494 10 15 14 15 8 84 19 9 28 21 5 | X5 | 1106 9 14 8 9 6 15 --- 14 18 24 5 | 6E | 799 22 28 19 21 16 58 23 14 18 14 7 | 7 | 768 10 25 10 19 9 22 30 10 30 27 7 | 8 | 984 10 13 8 16 7 15 12 7 19 24 5 | 9 | 1073 7 10 9 11 8 23 13 7 18 22 4 | 10 | 1118 8 17 10 12 5 18 15 9 31 15 5 | 11 | 895 10 19 10 15 8 28 19 9 21 17 5 | 12 | 440 9 25 9 14 6 21 18 12 17 23 5 | 13E | 708 8 17 8 16 8 29 19 10 23 20 5 | 14E | 669 8 18 8 10 6 18 18 9 20 16 4 | 15E | 597 9 22 12 14 4 15 26 12 20 11 5 | 16 | 847 8 23 10 13 7 16 24 11 19 25 5 | 17 | 353 7 22 6 11 7 22 20 8 24 11 4 | 18 | 728 8 22 8 11 8 26 27 10 26 10 5 | 19 | 562 7 23 11 12 6 26 25 10 18 15 5 | 20 | 706 9 21 10 12 9 13 20 9 31 15 5 | 21 | 1033 11 18 9 12 6 16 25 10 17 20 5 | 22 | 422 10 19 6 13 9 18 25 11 34 13 5 | 23E | 572 7 15 9 21 8 23 24 8 19 15 5 | 24 | 1697 6 15 7 9 5 81 15 12 18 19 4 | 25 | 1016 9 17 5 13 8 35 9 10 20 21 4 | 26E | 1484 9 17 14 14 7 26 16 19 20 16 6 | 27 | 1495 8 16 7 11 8 18 13 7 22 18 4 | 28 | 1056 6 22 12 17 10 20 22 9 21 15 5 | 29 | 652 10 28 13 8 6 40 15 10 25 15 5 | 30 | 615 11 18 10 11 7 18 12 9 14 19 4 | 31 | 682 11 21 9 9 19 27 26 12 18 22 5 | 32 | 1244 9 19 9 13 6 14 14 10 19 14 4 | ------+-------------------------------------------------------------+ RMS | 895 10 20 10 14 9 42 20 10 22 18 | WRMS | 895 9 20 10 14 8 36 20 10 21 17 | MEDI | 768 9 19 9 13 8 22 19 10 20 17 | 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 3.1519.3 GPS week: 1519 Day: 3 MJD: 54880.0 CENT| CLK EPO | BRUS | TOW2 | WILL | ----+----------+-------------------+-------------------+-------------------+ cod | cod 2976 | 8 8 18 | 10 17 38 | 7 8 17 | emr | emr 2968 | 10 9 25 | 17 20 46 | 9 8 24 | esa | esa 2976 | 8 8 21 | 10 17 38 | 7 8 18 | gfz | gfz 2950 | 9 7 16 | 11 18 60 | 8 10 20 | igr | igr 2965 | 8 8 19 | 11 17 35 | 6 7 19 | jpl | jpl 2872 | 9 10 26 | 11 20 34 | 6 8 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 4.1519.3 GPS week: 1519 Day: 3 MJD: 54880.500 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 | -35 56 106 75 -6 | -2 17 emr uuuuu | 35 95 -230 214 -15 | 47 50 esa uuuuu | -66 2 13 -122 5 | -11 29 gfz uuuuu | 97 2 -47 39 5 | 3 19 iga xxxxx | -10 10 104 84 -4 | 0 20 igu xxxxx | -101 -187 -120 -139 -85 | 75 93 jpl uuuuu | 38 3 287 209 13 | -18 25 ngs uuuuu | -21 -6 -80 -155 -8 | 8 34 sio uuxxu | -10 -29 -426 -123 20 | 39 43 usn uuuuu | -4 -69 154 155 -31 | 6 29