Author: AC Coordinator / AIUB/CODE Rapid IGS Orbit Prediction Combination - Week 1087 Day: 2 (Nov 07, 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 -------+--------------- ESP | 30 SIP | ALL (high Transformation - See Table 1) ESP | 28 _______________________________________________________________________________ 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 1.1087.2 GPS week: 1087 Day: 2 MJD: 51855.0 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS --------|------------------------------------------------|--------------------- cop n/a|0.00-0.01-0.02 0.47 -0.01 2.28 -0.1 0.28 0.26 | 0.0 0.0 0.0 emp n/a|0.00-0.01 0.00 -0.42 -0.20 -2.86 -0.2 0.26 0.16 | 0.0 0.0 0.0 esp n/a|0.00 0.01 0.09 -0.75 1.00 4.78 0.8 1.97 0.60 | 0.0 0.0 0.0 gfp n/a|0.00 0.00-0.03 0.26 0.04 -1.46 0.0 1.05 0.29 | 0.0 0.0 0.0 sip n/a|0.05 0.05-0.05 -0.64 1.14 7.97 0.8 2.02 3.23 | 0.0 0.0 0.0 usp n/a|-.01-0.01 0.02 0.12 0.18 1.26 0.7 0.64 0.38 | 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 2.1087.2 GPS week: 1087 Day: 2 MJD: 51855.0 Weighted Average PRN | cop emp esp gfp sip usp IGP | ------|------------------------------| 1 | 14 12 24 12 239 15 7 | 2E | 44 23 58 270 33 77 45 | 3 | 26 14 59 26 69 14 12 | 4 | 8 15 52 23 62 43 13 | 5E | 30 31 232 309 319 87 57 | 6 | 7 10 19 17 262 13 6 | 7 | 26 45 77 61 160 85 27 | 8 | 8 15 33 5 92 30 9 | 9 | 10 12 35 18 267 9 7 | 10E | 46 8 84 234 443 16 37 | 11 | 58 27 98 11 159 38 23 | 13 | 24 10 57 20 100 12 11 | X15 | 15 19 --- 32 49 13 11 | 17 | 39 18 98 15 126 14 17 | 19 | 33 42 29 18 165 124 31 | 20E | 8 13 42 82 328 25 15 | 21E | 8 11 59 108 27 34 19 | 22E | 7 53 288 97 122 72 43 | 24 | 17 22 78 7 57 80 21 | 25 | 26 9 56 18 185 13 11 | 26 | 9 9 34 5 140 12 6 | 27 | 18 16 272 12 160 37 34 | 28E | 33 9 452 105 338 8 67 | 29 | 10 16 64 17 282 15 10 | 30E | 59 72 699 63 63 207 117 | 31 | 8 23 24 41 72 35 12 | ------|------------------------------| RMS | 28 26 197 105 203 64 | WRMS | 26 16 60 29 323 38 | MEDI | 18 16 59 22 150 28 |