Author: AC Coordinator / AIUB/CODE Ultra Rapid IGS Orbit Combination - Week 1091 Day: 0 Hour: 00 (Dec 03, 2000) Contacts: T.A. Springer (springer@aiub.unibe.ch) H. Bock (bock@aiub.unibe.ch), R. Dach (dach@aiub.unibe.ch) 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 11 days after the end of the GPS week. REMARKS on IGS Ultra Rapid Orbit Combination: 1. The following non-Ultra-rapid orbits were excluded from the combination but kept for statistics: -> Centre: COU 2. Starting on 04-June-2000 (GPS Week 1065, day 0, MJD 51699) all IGS products, including the IGS combined orbits, are based on the IGS realization of the ITRF97 reference frame (IGS97). For more information see IGSMAILs #2899 and #2904. _______________________________________________________________________________ Table 1: Daily transformation of each centre to the combined IGS orbit and clocks. WRMS - RMS weighted by the centres SP3 header accuracy codes. STA - Number of stations in the daily solutions. Units: meters, mas, ppb, nano-sec, nano-sec/day. Table 1.1091.0 GPS week: 1091 Day: 0 MJD: 51881.0 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS --------|------------------------------------------------|--------------------- cou n/a|0.00 0.00-0.02 0.18 -0.19 -1.97 0.2 0.88 1.01 | 0.0 0.0 0.00 emu 38 |0.00 0.01-0.04 -0.14 -0.47 -0.39 -0.2 0.40 0.42 | 0.0 0.0 0.00 esu 20 |0.00-0.01 0.04 -0.25 0.17 1.39 0.6 0.33 0.25 | 0.0 0.0 0.00 gfu 30 |-.01 0.00-0.01 0.23 0.10 -0.21 0.0 0.18 0.16 | 0.0 0.0 0.00 siu 38 |0.01 0.00-0.02 -0.21 -0.05 -0.50 -0.3 0.51 0.46 | 0.0 0.0 0.00 Table 2: Daily fit for each satellite and each centre resulting from weighted average combination. The last column gives the IGS resulting satellite accuracy measures found in the IGS SP3 header. Eclipsing satellites are flagged with and "E" beside the PRN number. "X" stands for excluded from combination but included in IGS orbit. "MEDI" stands for median of the centre's satellite RMS. Units: cm. Table 2.1091.0 GPS week: 1091 Day: 0 MJD: 51881.0 Weighted Average PRN | cou emu esu gfu siu IGU | ------|--------------------------| 1 | 19 15 8 11 15 7 | 2 | 9 34 11 9 13 10 | 3E | 12 58 51 33 85 31 | 4 | 14 20 30 12 27 12 | 5 | 11 12 29 7 16 10 | 6E | 76 123 74 28 22 39 | 7E | 23 21 14 10 8 8 | 8 | 22 20 8 12 13 8 | 9 | 23 83 18 13 51 25 | 10E | 63 23 50 35 140 38 | 11 | 36 14 25 16 37 13 | 13 | 19 12 31 9 59 17 | X15 | 145 --- --- 3 14 8 | 17 | 49 47 9 11 50 17 | 19 | 411 53 41 27 85 28 | 20E | 51 16 21 10 27 10 | 21E | 36 48 78 13 18 25 | 22 | 8 15 34 33 44 19 | X23E | 570 --- --- 7 19 11 | 24 | 31 14 11 31 63 19 | 25 | 12 12 19 9 13 7 | 26 | 9 12 7 9 31 9 | 27 | 9 20 13 5 8 7 | 28 | 23 13 29 21 85 23 | 29 | 7 20 29 6 42 14 | 30 | 18 22 22 5 14 9 | 31E | 46 27 13 11 45 14 | ------|--------------------------| RMS | 88 40 33 18 51 | WRMS | 101 42 25 16 46 | MEDI | 23 20 22 11 27 | Table 3: Earth Orientation Parameters daily summary. Daily Centre ERP, ERP Rates and LOD differences with respect to IGU combined values. Xpole,Xrt: x pole and x pole rate (10**-5") Ypole,Yrt: y pole and y pole rate (10**-5"/day) LOD: Length Of Day (us) AC LOD BIAS: 21-day mean LOD bias with respect to Bulletin A (us) AC LOD BIAS RMS: RMS of AC LOD BIAS (us) 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 3.1090.6 GPS week: 1090 Day: 6 MJD: 51880.5 AC LOD AC LOD CENT FLAG | Xpole Ypole Xrt Yrt LOD | BIAS BIAS RMS ------------------------------------------------------------------------ cou xxxxx | 17 -14 28 -34 226 | -79 139 emu uuuuu | 36 25 24 -17 -122 | -42 156 esu* uuuuu | -20 -1 4 -5 -72 | 20 140 gfu uuuuu | -6 -22 -8 -28 -26 | 40 51 siu uuuuu | -3 29 -15 105 24 | 2 36 Table 3.1091.0 GPS week: 1091 Day: 0 MJD: 51881.5 AC LOD AC LOD CENT FLAG | Xpole Ypole Xrt Yrt LOD | BIAS BIAS RMS ------------------------------------------------------------------------ cou xxxxx | 40 -25 34 -40 258 | -79 139 emu uuuuu | 38 34 -4 -17 -61 | -42 156 esu* uuuu- | -18 19 16 -8 --- | --- --- gfu uuuuu | -18 -27 -2 -34 6 | 40 51 siu uuuux | 26 3 -11 125 249 | 2 36