Author: AC Coordinator / AIUB/CODE Rapid IGS Orbit Prediction Combination - Week 1044 Day: 1 (Jan 10, 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 Rapid Orbit Prediction Combination: 1. Clock corrections found in the IGP sp3 orbit file are clock predictions provided by COP. Users are reminded to use them with extreme caution. 2. 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: Centre | PRN list -------+--------------- JPP | 14 SIP | 16 COP | 14 USP | 14 USP | 16 JPP | ALL (high Transformation - See Table 1) SIP | 19 3. The following orbit solutions were rejected from the combination due to lack of redundancy, i.e. not enough centres providing a solution (=> Minimum number of centres: 3): Centre | PRN -------+----- COP | 16 EMP | 16 _______________________________________________________________________________ Table 1: Daily transformation of each centre to the combined IGP 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 1.1044.1 GPS week: 1044 Day: 1 MJD: 51553.0 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS --------|------------------------------------------------|--------------------- cop n/a|0.00-0.01-0.06 -0.51 -0.09 2.91 0.0 1.56 0.31 | 0.0 0.0 0.0 emp n/a|0.00 0.00 0.04 -0.63 -0.44 0.03 0.0 0.34 0.32 | 0.0 0.0 0.0 gfp n/a|0.00 0.01 0.00 0.70 0.36 -0.25 -0.1 0.23 0.21 | 0.0 0.0 0.0 jpp n/a|0.13-0.11-0.21-10.90 4.21 50.99 19.410.5510.80 | 0.0 0.0 0.0 sip n/a|0.01 0.02-0.01 -0.01 0.45 2.88 0.5 2.33 2.31 | 0.0 0.0 0.0 usp n/a|0.00 0.01 0.07 -0.48 0.42 -0.01 0.7 1.62 0.52 | 0.0 0.0 0.0 Table 2: Daily fit for each satellite and each centre resulting from weighted average combination. The last column gives the IGP resulting satellite accuracy measures found in the IGP SP3 header. Eclipsing satellites are flagged with and "E" beside the PRN number. "MEDI" stands for median of the centre's satellite RMS. Units: cm. Table 2.1044.1 GPS week: 1044 Day: 1 MJD: 51553.0 Weighted Average PRN | cop emp gfp jpp sip usp IGP | ------|------------------------------| 1 | 184 30 37 365 147 93 37 | 2 | 13 4 22 594 227 12 27 | 3E | 143 96 28 225 136 536 84 | 4 | 201 26 29 >>> 217 16 39 | 5 | 30 10 19 311 23 21 9 | 6E | 66 66 26 >>> 56 306 49 | 7E | 9 11 38 543 154 312 48 | 8 | 43 9 15 >>> 58 60 13 | 9 | 100 18 13 354 66 14 17 | 10 | 51 7 14 >>> 9 41 11 | X11 | 52 57 --- --- 485 118 93 | 13 | 27 22 21 >>> 93 41 16 | 15 | 556 57 34 >>> 39 197 85 | 17 | 31 6 12 >>> 24 42 9 | 18 | 198 20 10 695 413 43 55 | 19 | 133 49 23 426 799 220 46 | 21 | 97 19 12 900 129 47 22 | 22 | 16 18 7 436 219 31 26 | 24 | 215 27 34 >>> 44 68 35 | 25 | 20 8 26 962 262 12 31 | 26 | 16 4 11 587 137 16 16 | 27 | 19 11 23 >>> 320 8 37 | 29 | 35 41 14 675 26 65 17 | X30 | 15 7 --- 387 25 34 10 | 31E | 148 12 6 459 30 84 24 | ------|------------------------------| RMS | 156 34 23 >>> 233 162 | WRMS | 31 32 21 >>> 232 52 | MEDI | 51 18 21 685 129 43 |