Author: AC Coordinator / AIUB/CODE Rapid IGS Orbit Prediction Combination - Week 1044 Day: 5 (Jan 14, 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 -------+--------------- COP | 18 JPP | 18 SIP | 14 ESP | 14 ESP | 18 USP | 18 JPP | ALL (high Transformation - See Table 1) ESP | 15 ESP | 6 ESP | 16 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 | 14 EMP | 14 COP | 16 USP | 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 1.1044.5 GPS week: 1044 Day: 5 MJD: 51557.0 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS --------|------------------------------------------------|--------------------- cop n/a|0.00 0.00-0.01 -0.14 0.04 1.46 -0.2 0.94 0.14 | 0.0 0.0 0.0 emp n/a|0.00 0.00 0.01 -0.03 -0.39 1.67 0.2 0.64 0.64 | 0.0 0.0 0.0 esp n/a|-.01-0.03 0.10 -0.11 -0.51 -9.29 -0.9 4.63 0.37 | 0.0 0.0 0.0 gfp n/a|0.00 0.01-0.06 0.69 0.47 1.58 -0.1 0.87 0.39 | 0.0 0.0 0.0 jpp n/a|0.07-0.16-0.11 -7.71 6.26 28.21 2.2 9.03 9.61 | 0.0 0.0 0.0 sip n/a|0.02-0.01-0.05 -0.88 0.25 6.41 0.5 2.15 1.87 | 0.0 0.0 0.0 usp n/a|0.00 0.00-0.04 0.20 0.88 1.12 0.4 1.11 0.49 | 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 2.1044.5 GPS week: 1044 Day: 5 MJD: 51557.0 Weighted Average PRN | cop emp esp gfp jpp sip usp IGP | ------|----------------------------------| 1E | 8 5 34 37 334 177 33 14 | 2 | 6 17 18 11 648 171 18 12 | 3E | 14 44 65 204 464 130 101 39 | 4 | 9 16 45 40 >>> 269 10 19 | 5 | 15 10 30 13 418 60 25 9 | X6E | 40 110 >>> --- 987 165 183 60 | 7E | 12 26 45 111 864 41 187 35 | 8 | 8 13 25 8 --- 139 40 12 | 9 | 15 14 46 7 >>> 113 17 12 | 10 | 25 31 45 58 955 103 21 17 | 11 | 30 11 38 97 --- 153 57 22 | 13E | 11 11 27 38 >>> 402 86 28 | 15 | 443 277 >>> 289 >>> 441 442 191 | 17 | 19 7 28 47 >>> 110 9 12 | 19 | 26 47 28 56 235 398 41 29 | 21 | 8 5 59 25 577 295 45 22 | 22 | 22 14 21 12 410 172 7 13 | 24 | 9 11 42 31 >>> 135 29 13 | 25 | 11 21 26 10 >>> 317 9 20 | 26E | 10 16 27 32 464 266 85 22 | 27 | 19 29 42 12 698 46 35 13 | 29E | 15 83 62 35 330 32 98 27 | 30 | 11 29 27 11 212 22 35 10 | 31E | 19 42 63 97 480 85 55 23 | ------|----------------------------------| RMS | 94 64 463 87 903 215 111 | WRMS | 14 64 37 39 961 187 49 | MEDI | 15 17 40 35 673 146 38 |