Author: AC Coordinator / NOAA NGS sum-file Version 2.0 Rapid IGS Orbit Combination - Week 1524 Day: 2 (Mar 24, 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: igr15242.sp3 IGR GPS ephemeris in SP3 format. igr15242.clk IGR GPS satellite and station clocks in RINEX format. igr15242.cls IGR GPS clock combination summary report. igr15242.erp Earth Rotation Parameters (ERP) and their rates as well as Universal Time (UT1-UTC) and Length Of Day (LOD) associated with IGS ephemerides. igr15242.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 ----+--------+--------------- 2 | EMR | DAEJ 2 | ESA | NRIL 2 | GFZ | 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 2 | GFZ | 21 22 23 24 25 26 27 28 29 30 31 32 ALGO AREQ ARTU 2 | GFZ | ASPA BOGT BRFT CEDU CHAT COCO CRO1 DARW DGAR FAIR 2 | GFZ | GLPS GLSV GOLD GUAM GUAT HARB HRAO IISC ISPA KARR 2 | GFZ | KERG KIRU KIT3 KOKB KOUR LPGS MAS1 MATE MAW1 MBAR 2 | GFZ | MCM4 MDO1 MKEA NLIB NRC1 NRIL PETP PIE1 PIMO POL2 2 | GFZ | SANT SCH2 SEY1 SHAO STJO SUTH SYOG THTI THU3 TIDB 2 | GFZ | TOW2 TSKB ULAB YELL ZWE2 2 | JPL | IISC 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 1.1524.2 GPS week: 1524 Day: 2 MJD: 54914.000 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| 50 -65 -59 -1103 -2832 -2772-25.72 789 789 | 124 -393 3124 4896 cod 127| 1 0 2 -49 48 -28 -.17 8 8 | -228 -656 17 90 emr 43| -3 2 4 -35 -95 -65 .42 19 19 | 2480 -175 11 157 esa 95| 1 -1 -2 59 20 -22 .31 10 9 | -295 53 16 112 gfz 94| 0 -1 -4 5 -42 -7 -.19 12 12 | -1791 20242 0 0 iga n/a| 0 -1 0 -38 14 -13 -.03 7 7 | 122 -400 23 135 igu n/a| 1 1 -11 -475 91 -222 -.11 41 45 | 123 -394 2093 3886 jpl 80| 0 0 5 -23 0 44 .54 18 18 | 2968 -83 11 75 ngs 85| -1 0 -1 68 34 -22 -.40 13 11 | 121 -393 2612 4145 sio 57| -1 0 0 55 29 94 -.23 17 16 | 0 0 0 0 usn 35| 1 1 0 -93 -114 39 -.04 15 15 | -268 -475 53 129 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 2.1524.2 GPS week: 1524 Day: 2 MJD: 54914.000 Weighted Average PRN | brd cod emr esa gfz iga igu jpl ngs sio usn IGR | ------+-------------------------------------------------------------+ 2 | 356 6 21 9 9 5 27 23 12 21 12 5 | 3 | 1155 6 19 7 10 6 57 13 12 18 11 4 | 4 | 516 8 17 9 9 4 14 11 11 16 13 4 | 5 | 567 9 11 11 14 5 23 10 12 12 22 4 | 6 | 617 6 18 8 11 8 35 13 11 20 10 4 | 7 | 238 6 21 9 16 7 14 21 14 14 22 5 | 8 | 624 8 20 9 9 7 20 11 13 16 15 4 | 9 | 1476 9 15 10 13 6 42 10 12 16 20 4 | 10 | 1124 8 17 9 10 5 20 10 12 15 11 4 | 11 | 794 13 15 8 10 7 29 13 10 28 15 5 | 12 | 850 10 16 11 14 4 30 19 11 11 24 5 | 13 | 606 8 20 11 10 12 64 23 16 20 18 5 | 14 | 702 10 19 9 9 7 27 20 12 14 7 4 | 15 | 457 10 19 10 14 6 22 24 15 17 17 5 | 16 | 885 7 23 10 8 6 25 20 17 14 19 5 | 17 | 503 8 20 12 14 6 19 24 12 20 11 5 | 18 | 942 7 21 11 14 6 22 24 8 13 12 5 | 19 | 470 10 26 12 14 9 138 21 22 20 15 6 | 20 | 1069 8 22 12 13 8 22 25 15 14 15 5 | 21 | 965 11 24 12 11 8 21 20 10 21 10 5 | 22 | 746 4 20 13 7 7 27 22 11 10 12 4 | 23 | 684 7 21 8 13 6 15 31 12 17 12 5 | 24 | 1037 8 13 9 7 5 30 14 18 13 12 4 | 25 | 719 7 18 9 8 7 50 12 14 14 15 4 | 26 | 714 10 19 8 15 11 61 14 14 14 19 5 | 27 | 772 9 17 6 13 7 20 10 10 24 10 4 | 28 | 1083 7 17 8 12 6 28 24 12 11 16 5 | 29 | 336 8 21 9 12 6 38 23 15 15 19 5 | 30 | 633 6 12 8 10 7 44 8 12 10 16 3 | 31 | 641 7 18 9 11 10 36 18 14 14 14 4 | 32 | 729 8 19 7 12 8 20 15 15 17 15 4 | ------+-------------------------------------------------------------+ RMS | 789 8 19 10 12 7 41 18 13 17 15 | WRMS | 789 8 19 9 12 7 45 18 11 16 15 | MEDI | 714 8 19 9 11 7 27 19 12 15 15 | 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 3.1524.2 GPS week: 1524 Day: 2 MJD: 54914.0 CENT| CLK EPO | BRUS | TOW2 | WILL | ----+----------+-------------------+-------------------+-------------------+ cod | cod 2976 | 8 7 23 | 6 8 30 | 10 6 16 | emr | emr 2976 | 10 10 24 | 8 10 33 | 9 7 21 | esa | esa 2976 | 8 7 23 | 7 10 30 | 8 6 15 | gfz | gfz 2973 | 10 11 31 | 7 9 28 | 7 6 18 | igr | igr 2976 | 8 8 23 | 7 11 31 | 8 5 15 | jpl | jpl 2976 | 8 9 25 | 8 10 34 | 8 7 19 | 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 4.1524.2 GPS week: 1524 Day: 2 MJD: 54914.500 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 | -38 38 364 -123 6 | -2 19 emr uuuuu | 123 -12 259 197 2 | 45 50 esa uuuuu | -78 -23 -82 -139 -15 | 9 22 gfz uuuuu | -18 12 -62 -221 -25 | 20 28 iga xxxxx | -16 10 104 -107 6 | -3 18 igu xxxxx | -97 451 22 471 45 | -3 44 jpl uuuuu | -8 27 -23 -120 16 | -5 22 ngs uuuuu | -25 17 -125 79 8 | -7 19 sio uuuuu | 18 -59 189 612 -5 | 51 58 usn uuuuu | 98 45 29 -132 4 | -14 25