Author: AC Coordinator / NOAA NGS sum-file Version 2.0 Rapid IGS Orbit Combination - Week 1506 Day: 6 (Nov 22, 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: igr15066.sp3 IGR GPS ephemeris in SP3 format. igr15066.clk IGR GPS satellite and station clocks in RINEX format. igr15066.cls IGR GPS clock combination summary report. igr15066.erp Earth Rotation Parameters (ERP) and their rates as well as Universal Time (UT1-UTC) and Length Of Day (LOD) associated with IGS ephemerides. igr15066.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 ----+--------+--------------- 6 | COD | 23 27 6 | EMR | 8 9 21 6 | ESA | 27 DAV1 JOZE NRIL 6 | GFZ | 7 8 9 21 KERG 6 | JPL | 9 27 DAEJ DARW HARB KARR NICO TOW2 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 ----+--------+--------------- 6 | USN | 1 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 1.1506.6 GPS week: 1506 Day: 6 MJD: 54792.000 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| 28 -24 -20 -2448 -4638 -3129-25.71 1018 1018 | 52 -41 2580 4208 cod 127| -1 2 1 -35 18 -13 -.28 12 12 | -323 17 32 146 emr 45| -1 0 3 -2 -5 -5 .38 18 18 | 3368 1427 18 109 esa 95| 0 0 -2 21 2 -37 .15 14 14 | -1141 1363 18 103 gfz 98| -2 1 -1 6 -17 -9 -.06 15 15 | -215 740 22 126 iga n/a| 1 0 -1 -66 -45 -236 -.15 10 9 | 12 62 45 144 igu n/a| 2 1 0 -274 -348 385 -.15 60 46 | 276 -4342 2037 4117 jpl 45| 2 -4 5 5 -18 80 .38 19 19 | 4911 1544 17 191 ngs 110| -1 0 -2 -58 -29 -59 -.33 15 15 | 50 -35 2192 3738 sio 71| 2 -1 -3 90 35 54 -.28 23 21 | 0 0 0 0 usn 46| 0 -1 -6 1 -16 61 .03 31 25 | 3903 1481 66 1777 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 2.1506.6 GPS week: 1506 Day: 6 MJD: 54792.000 Weighted Average PRN | brd cod emr esa gfz iga igu jpl ngs sio usn IGR | ------+-------------------------------------------------------------+ X1 | 1478 5 --- --- --- --- --- --- --- --- 4303 0 | 2 | 1050 11 20 13 12 11 51 16 19 14 26 6 | 3 | 1020 13 11 8 11 5 61 12 13 25 24 5 | 4 | 882 16 15 10 17 11 40 16 15 17 17 5 | 5 | 700 9 18 7 11 8 37 11 13 41 25 6 | 6 | 726 12 12 8 15 5 39 13 11 21 24 5 | 7E | 1142 10 20 18 12 9 26 23 16 20 70 8 | 8E | 654 20 18 25 15 13 183 21 25 27 25 8 | 9E | 1757 20 17 15 16 14 140 21 16 18 23 6 | 10 | 601 9 15 10 12 8 38 14 20 12 16 5 | 11 | 1074 12 15 13 19 8 18 19 17 23 48 7 | 12 | 1209 15 17 14 15 10 37 21 13 29 26 6 | 13 | 890 12 17 17 15 10 19 18 13 20 26 6 | 14 | 894 11 21 17 15 10 28 18 14 16 49 7 | 15 | 228 14 19 17 20 10 23 21 14 23 23 7 | 16 | 1047 13 18 17 18 11 57 24 15 28 30 7 | 17 | 242 10 11 14 14 11 43 27 11 17 23 6 | 18 | 695 13 20 13 13 10 55 19 12 20 25 6 | 19 | 450 10 18 15 12 8 48 20 14 19 35 6 | 20 | 736 10 20 14 9 7 45 19 14 18 32 6 | 21 | 809 13 15 15 13 10 31 14 14 25 32 6 | 22 | 783 11 19 13 14 8 52 18 12 18 26 6 | 23 | 853 12 20 19 13 12 31 22 17 17 31 6 | 24 | 2211 12 17 13 13 11 25 15 17 18 15 5 | 25E | 970 13 17 12 15 16 59 20 16 32 36 7 | 26 | 1074 8 15 11 16 6 49 14 11 23 19 5 | X27E | 1746 29 21 12 17 15 --- 24 22 --- 27 9 | 28 | 1276 13 18 15 18 9 102 21 16 22 37 7 | 29 | 1051 13 11 9 13 9 40 22 17 21 24 6 | 30 | 965 9 19 9 10 8 28 9 12 41 23 6 | 31E | 865 12 22 12 15 8 45 20 17 19 26 6 | 32 | 1414 11 24 8 21 7 39 19 13 16 42 7 | ------+-------------------------------------------------------------+ RMS | 1019 12 18 14 15 10 60 19 15 23 31 | WRMS | 1019 12 18 14 15 9 46 19 15 21 25 | MEDI | 894 12 18 13 15 10 40 19 14 20 26 | 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 3.1506.6 GPS week: 1506 Day: 6 MJD: 54792.0 CENT| CLK EPO | BRUS | TOW2 | WILL | ----+----------+-------------------+-------------------+-------------------+ cod | cod 3071 | 14 18 27 | 17 19 45 | 11 8 24 | emr | emr 2960 | 17 20 30 | 19 20 47 | 13 11 32 | esa | esa 2976 | 13 18 30 | 15 14 44 | 9 6 22 | gfz | gfz 2951 | 14 19 25 | 16 14 48 | 18 18 46 | igr | igr 2950 | 12 18 31 | 17 14 43 | 10 7 26 | jpl | jpl 2957 | 17 25 38 | 15 14 50 | 11 13 23 | 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 4.1506.6 GPS week: 1506 Day: 6 MJD: 54792.500 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 | -36 31 94 -64 -6 | 1 18 emr uuuuu | 28 35 -98 116 3 | 41 49 esa uuuuu | 1 -11 58 85 -8 | 11 24 gfz uuuuu | -22 24 -66 45 -5 | 17 25 iga xxxxx | 37 58 3 -42 -1 | -3 19 igu xxxxx | 235 183 214 -20 -8 | -13 53 jpl uuuuu | 54 -14 -47 301 -8 | -10 32 ngs uuuuu | -34 15 150 -479 -3 | 8 32 sio uuxxu | -49 -84 232 50 11 | 40 47 usn uuuuu | 57 16 -21 -124 29 | -14 33