Author: AC Coordinator / NOAA NGS sum-file Version 2.0 Rapid IGS Orbit Combination - Week 1528 Day: 4 (Apr 23, 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: igr15284.sp3 IGR GPS ephemeris in SP3 format. igr15284.clk IGR GPS satellite and station clocks in RINEX format. igr15284.cls IGR GPS clock combination summary report. igr15284.erp Earth Rotation Parameters (ERP) and their rates as well as Universal Time (UT1-UTC) and Length Of Day (LOD) associated with IGS ephemerides. igr15284.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 ----+--------+--------------- 4 | ALL | 1 4 | COD | 4 24 4 | EMR | WTZR 4 | ESA | 4 24 JOZE SYOG 4 | GFZ | 2 7 21 29 HARB MATE 4 | JPL | 4 GUAT HARB 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 ----+--------+--------------- 4 | USN | 5 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 1.1528.4 GPS week: 1528 Day: 4 MJD: 54944.000 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| -58 -94 23 251 976 -2369-24.36 863 863 | -515 763 2743 4572 cod 129| 0 0 0 1 49 -59 -.17 9 8 | -1627 1903 24 86 emr 45| 0 2 3 -68 -116 -67 .38 21 21 | 4170 -29 13 69 esa 95| 0 1 -2 48 -11 12 .30 10 10 | -180 -758 13 80 gfz 91| 0 0 0 -12 -60 -29 -.24 14 14 | -151 189 23 120 iga n/a| 1 1 0 -38 27 52 .00 9 8 | -693 879 21 95 igu n/a| -1 1 -6 50 538 544 .05 106 56 | -977 874 2446 5270 jpl 80| -1 -1 -2 -17 6 20 .52 20 20 | 4250 4 13 87 ngs 97| 0 0 1 43 -30 -81 -.52 16 14 | -563 861 2298 3945 sio 63| 0 -2 2 10 -40 55 -.14 22 20 | 0 0 0 0 usn 35| -1 -1 4 -142 209 391 -.03 24 24 | -945 378 63 122 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 2.1528.4 GPS week: 1528 Day: 4 MJD: 54944.000 Weighted Average PRN | brd cod emr esa gfz iga igu jpl ngs sio usn IGR | ------+-------------------------------------------------------------+ X1 | 1965 33 36 41 --- --- --- --- --- --- --- 26 | 2E | 590 12 20 9 13 10 127 31 10 16 27 6 | 3 | 776 6 14 8 12 7 30 12 15 19 19 4 | 4E | 843 15 21 12 14 8 91 19 21 41 28 7 | X5 | 1031 14 40 7 --- 11 81 --- 19 --- 97 11 | 6 | 1017 5 17 8 16 7 32 11 11 22 18 4 | 7 | 901 6 21 8 12 10 30 18 18 26 29 6 | 8 | 965 11 24 9 14 8 23 12 18 26 26 6 | 9E | 952 14 21 7 17 12 33 15 17 19 22 6 | 10 | 700 8 13 7 13 9 54 9 13 17 20 4 | 11E | 1352 7 17 10 13 7 46 18 14 27 24 5 | 12 | 984 12 20 12 17 5 24 21 12 20 17 6 | 13 | 831 8 29 12 14 6 37 26 16 34 32 7 | 14 | 684 7 20 9 12 8 20 20 11 21 26 5 | 15 | 420 9 17 8 16 7 30 25 12 12 14 5 | 16 | 702 8 16 9 12 9 29 20 11 18 18 5 | 17 | 587 9 23 9 16 8 27 24 18 18 24 6 | 18 | 700 8 30 10 12 9 26 22 14 22 18 6 | 19 | 517 9 28 11 12 8 34 28 14 19 19 6 | 20 | 1026 8 24 12 14 7 22 25 14 18 15 5 | 21E | 1423 11 20 10 10 8 55 23 15 18 35 6 | 22 | 510 7 20 14 9 8 34 23 14 21 15 5 | 23 | 582 8 27 16 14 6 27 27 14 31 26 7 | 24E | 1257 14 24 15 16 18 444 20 27 32 30 8 | 25E | 1089 14 22 10 17 14 123 14 21 21 26 6 | 26 | 485 7 16 12 15 7 23 13 11 18 21 5 | 27E | 1053 10 20 11 13 16 265 17 21 24 27 6 | 28 | 788 8 18 8 15 6 30 20 15 15 19 5 | 29 | 772 8 20 12 12 5 38 22 20 17 28 6 | 30 | 898 7 14 9 13 5 41 14 13 14 21 4 | 31 | 353 8 18 8 10 9 24 22 14 22 19 5 | 32 | 910 6 21 9 17 10 80 16 14 21 27 5 | ------+-------------------------------------------------------------+ RMS | 863 9 21 10 14 9 106 20 16 22 24 | WRMS | 863 8 21 10 14 8 56 20 14 20 24 | MEDI | 831 8 20 9 13 8 33 20 14 20 24 | 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 3.1528.4 GPS week: 1528 Day: 4 MJD: 54944.0 CENT| CLK EPO | BRUS | TOW2 | WILL | ----+----------+-------------------+-------------------+-------------------+ cod | cod 3071 | 5 6 15 | 9 8 34 | 8 8 16 | emr | emr 3044 | 11 10 52 | 10 10 40 | 8 9 16 | esa | esa 3072 | 7 8 23 | 8 8 39 | 8 8 18 | gfz | gfz 2849 | 9 8 31 | 13 8 53 | 10 10 22 | igr | igr 2934 | 10 9 40 | 9 7 39 | 8 8 16 | jpl | jpl 2861 | 11 10 50 | 9 7 33 | 8 8 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 4.1528.4 GPS week: 1528 Day: 4 MJD: 54944.500 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 | -58 -5 121 7 16 | 8 18 emr uuuuu | 158 79 320 478 4 | 59 61 esa uuuuu | -27 -75 50 -116 9 | 20 28 gfz uuuuu | 39 9 20 -122 13 | 18 22 iga xxxxx | -24 28 -32 -83 10 | -1 14 igu xxxxx | -594 -80 -844 -385 -26 | -20 35 jpl uuuuu | 28 11 255 83 6 | 20 24 ngs uuuuu | -55 -17 -487 -208 -16 | 14 22 sio uuuuu | 53 -8 118 381 14 | 77 79 usn uuuuu | -221 140 -221 -211 -6 | 1 17