Author: AC Coordinator / AIUB/CODE Rapid IGS Orbit Prediction Combination - Week 1053 Day: 0 (Mar 12, 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 -------+--------------- USP | 24 ESP | 24 USP | 14 USP | 8 ESP | ALL (high Transformation - See Table 1) 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 | 15 COP | 24 _______________________________________________________________________________ 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 1.1053.0 GPS week: 1053 Day: 0 MJD: 51615.0 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS --------|------------------------------------------------|--------------------- cop n/a|-.01 0.00-0.02 -0.25 -0.07 0.63 -0.1 0.47 0.22 | 0.0 0.0 0.0 emp n/a|0.00 0.00 0.02 0.29 -0.47 -1.00 -0.2 0.23 0.23 | 0.0 0.0 0.0 esp n/a|0.00 0.00 0.01 -0.13 0.00 8.88 1.1 0.92 0.46 | 0.0 0.0 0.0 gfp n/a|-.01 0.00 0.02 0.18 1.74 0.83 0.4 1.42 0.46 | 0.0 0.0 0.0 jpp n/a|0.00 0.00-0.01 0.10 -0.12 -0.91 -0.3 1.91 0.51 | 0.0 0.0 0.0 sip n/a|0.02 0.00 0.08 -0.07 -0.76 -2.96 -0.4 3.12 2.07 | 0.0 0.0 0.0 usp n/a|0.00 0.00 0.01 -0.46 1.30 1.85 0.6 1.45 0.76 | 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 2.1053.0 GPS week: 1053 Day: 0 MJD: 51615.0 Weighted Average PRN | cop emp esp gfp jpp sip usp IGP | ------|----------------------------------| 1 | 10 9 55 19 22 308 23 20 | 2 | 20 15 27 30 65 322 13 22 | 3 | 34 24 42 19 41 182 14 17 | 4E | 14 28 70 316 242 55 19 46 | 5 | 6 6 14 38 33 222 23 15 | 6 | 6 12 26 11 30 346 12 22 | 7 | 29 6 28 43 36 391 13 26 | X8E | 11 21 122 181 --- 35 825 161 | 9E | 29 59 43 272 215 46 444 75 | 10 | 12 12 49 12 204 47 12 20 | 11E | 21 29 95 60 85 329 139 32 | 13 | 17 14 38 13 72 178 26 15 | X14 | 305 203 389 --- --- 362 >>> 418 | 16 | 45 13 48 99 143 461 111 39 | 17E | 18 8 199 28 12 28 21 7 | 18 | 16 7 48 16 28 129 13 10 | 19E | 75 21 268 393 453 32 198 72 | 21 | 32 7 32 14 52 515 29 34 | 22 | 15 9 11 34 79 94 15 11 | 25E | 166 43 136 269 513 284 225 81 | 26 | 2 9 55 32 14 51 41 8 | 27E | 86 8 121 180 405 163 317 66 | 29 | 10 44 93 82 70 559 223 50 | 30 | 9 12 16 14 35 195 23 14 | 31 | 31 25 73 48 54 760 76 50 | ------|----------------------------------| RMS | 47 23 92 142 191 312 145 | WRMS | 22 23 46 46 51 207 76 | MEDI | 18 13 49 36 65 195 26 |