Author: AC Coordinator / NOAA NGS sum-file Version 2.0 Rapid IGS Orbit Combination - Week 1511 Day: 3 (Dec 24, 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: igr15113.sp3 IGR GPS ephemeris in SP3 format. igr15113.clk IGR GPS satellite and station clocks in RINEX format. igr15113.cls IGR GPS clock combination summary report. igr15113.erp Earth Rotation Parameters (ERP) and their rates as well as Universal Time (UT1-UTC) and Length Of Day (LOD) associated with IGS ephemerides. igr15113.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 | 10 3 | EMR | 32 3 | ESA | 10 JOZE SYOG TSKB 3 | GFZ | 7 18 32 3 | JPL | 32 THTI 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 ----+--------+--------------- 3 | USN | 1 6 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 1.1511.3 GPS week: 1511 Day: 3 MJD: 54824.000 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| 27 -6 -24 1528 61 -3052-25.74 897 897 | -141 220 2479 4008 cod 126| 0 0 1 -46 25 2 -.18 11 11 | -735 484 18 118 emr 45| -1 -2 2 -57 -48 -61 .36 19 19 | 3453 -556 15 78 esa n/a| 0 1 -4 24 7 12 .24 9 9 | -598 723 16 101 gfz 96| 0 -1 -3 5 16 -7 -.24 13 13 | 8 218 19 122 iga n/a| 0 0 0 29 -17 243 -.02 7 7 | -170 248 33 149 igu n/a| 1 0 2 174 53 257 .00 51 36 | -52 -2352 2169 3428 jpl 45| 2 -1 13 -38 -76 -45 .44 22 21 | 4240 -613 20 259 ngs 102| 0 2 4 5 -36 18 -.42 14 12 | -204 320 2156 3703 sio 71| 3 -1 -3 38 55 65 -.30 21 17 | 0 0 0 0 usn 45| -4 -3 -2 254 148 -47 .11 70 30 | 3161 -625 78 1791 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 2.1511.3 GPS week: 1511 Day: 3 MJD: 54824.000 Weighted Average PRN | brd cod emr esa gfz iga igu jpl ngs sio usn IGR | ------+-------------------------------------------------------------+ X1 | 1105 4 --- --- --- --- --- --- --- --- 335 0 | 2 | 792 13 17 10 12 9 27 19 15 21 40 6 | 3 | 794 6 16 7 7 6 14 13 9 33 41 5 | 4 | 634 9 12 6 14 7 23 17 13 19 23 4 | 5 | 815 11 14 11 14 8 33 15 14 14 30 5 | 6 | 1196 8 14 6 8 5 13 13 13 25 335 5 | 7 | 861 9 20 7 22 4 36 21 16 16 63 7 | 8 | 934 13 18 9 13 6 30 16 14 21 26 5 | 9 | 1418 7 15 8 9 6 26 13 11 13 23 4 | 10E | 1802 15 22 13 21 9 58 21 25 45 28 8 | 11 | 1041 14 21 6 15 8 36 23 14 15 51 6 | 12 | 822 7 20 14 7 6 30 25 11 14 30 5 | 13 | 987 10 19 8 10 5 12 27 9 16 40 5 | 14 | 908 10 22 10 16 6 14 28 12 9 46 6 | 15 | 327 13 22 12 11 9 31 35 19 19 28 7 | 16 | 667 10 22 8 10 6 16 19 9 18 40 5 | 17 | 247 9 15 8 24 8 15 24 11 20 37 6 | 18E | 833 9 18 8 12 6 46 20 16 16 39 5 | 19 | 670 15 14 5 8 5 13 22 11 40 53 7 | 20E | 1332 14 15 7 11 5 49 27 12 16 39 5 | 21 | 669 15 19 7 7 5 15 23 13 14 49 6 | 22E | 649 10 23 8 12 5 17 19 17 7 24 5 | 23 | 406 10 26 8 14 7 14 21 11 16 36 6 | 24 | 759 6 14 7 11 6 48 9 10 14 28 4 | 25 | 1171 9 14 8 6 5 16 15 9 20 29 4 | 26 | 535 11 16 9 11 7 44 13 15 22 22 5 | 27 | 1026 12 17 8 13 6 25 15 14 19 21 5 | 28 | 814 11 25 11 16 7 26 23 15 16 46 7 | 29 | 543 9 11 10 8 6 22 32 10 16 32 5 | 30 | 577 11 18 7 12 8 181 14 11 28 23 5 | 31 | 851 12 22 11 11 5 32 24 12 12 31 5 | 32E | 943 25 26 10 15 14 149 33 19 23 61 8 | ------+-------------------------------------------------------------+ RMS | 897 11 19 9 13 7 51 22 14 21 70 | WRMS | 897 11 19 9 13 7 36 21 12 17 30 | MEDI | 815 10 18 8 12 6 26 21 13 16 36 | 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 3.1511.3 GPS week: 1511 Day: 3 MJD: 54824.0 CENT| CLK EPO | BRUS | TOW2 | WILL | ----+----------+-------------------+-------------------+-------------------+ cod | cod 3072 | 7 9 30 | 8 13 26 | 12 13 24 | emr | emr 2968 | 10 12 37 | 12 11 37 | 11 13 21 | esa | esa 2976 | 8 11 33 | 9 12 25 | 11 9 21 | gfz | gfz 2958 | 11 11 34 | 13 17 43 | 15 13 29 | igr | igr 2961 | 10 12 34 | 11 13 31 | 11 12 23 | jpl | jpl 2967 | 11 15 42 | 11 14 36 | 12 15 34 | 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 4.1511.3 GPS week: 1511 Day: 3 MJD: 54824.500 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 | -19 8 -7 111 25 | -4 17 emr uuuuu | 57 88 -104 103 4 | 37 42 esa uuuuu | -25 -22 42 -127 -6 | -2 19 gfz uuuuu | 4 -14 -5 25 -12 | 2 16 iga xxxxx | 9 -37 40 36 12 | 3 16 igu xxxxx | -83 -211 -141 -164 35 | -32 71 jpl uuuuu | 109 21 45 245 9 | -12 21 ngs uuuuu | -14 -7 -6 -82 13 | -14 22 sio uuxxu | -55 -25 49 -60 6 | 32 39 usn uuuuu | -140 -54 -6 103 24 | 19 38