Author: AC Coordinator / AIUB/CODE Rapid IGS Orbit Prediction Combination - Week 1085 Day: 6 (Oct 28, 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 -------+--------------- SIP | 19 USP | 24 SIP | 24 ESP | 19 SIP | 7 COP | 19 SIP | ALL (high Transformation - See Table 1) ESP | 2 COP | 24 GFP | 5 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 -------+----- EMP | 19 EMP | 24 ESP | 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 1.1085.6 GPS week: 1085 Day: 6 MJD: 51845.0 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS --------|------------------------------------------------|--------------------- cop n/a|0.00 0.00 0.00 -0.37 -0.35 -1.10 -0.2 0.25 0.25 | 0.0 0.0 0.0 emp n/a|0.01 0.00 0.02 0.70 0.40 0.41 -0.1 0.20 0.14 | 0.0 0.0 0.0 esp n/a|0.00 0.00 0.00 -0.69 0.05 0.99 0.3 0.90 0.20 | 0.0 0.0 0.0 gfp n/a|0.00 0.00 0.00 0.75 -0.29 0.00 0.2 1.01 0.20 | 0.0 0.0 0.0 sip n/a|0.03 0.00 0.01 -1.49 0.55 -6.86 -0.1 2.20 1.53 | 0.0 0.0 0.0 usp n/a|0.01-0.01-0.03 -0.35 -0.33 -1.57 -0.3 0.57 0.44 | 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 2.1085.6 GPS week: 1085 Day: 6 MJD: 51845.0 Weighted Average PRN | cop emp esp gfp sip usp IGP | ------|------------------------------| 1 | 18 5 7 14 41 94 14 | 2E | 36 22 410 211 35 61 137 | 3 | 14 5 18 19 184 21 7 | 4 | 9 4 6 12 160 23 5 | 5E | 37 47 87 328 181 136 73 | 6 | 9 8 15 17 195 11 6 | 7 | 10 4 15 8 576 12 5 | 8 | 7 12 6 22 207 32 7 | 9 | 16 5 6 20 156 15 6 | 10 | 10 5 13 18 206 19 6 | 11 | 79 29 53 17 46 53 26 | 13 | 8 7 4 14 266 21 5 | X15 | 6 5 --- 15 70 25 6 | 17 | 15 7 20 13 98 8 7 | 20 | 43 10 25 8 175 40 14 | 21 | 13 28 19 7 25 117 19 | 22E | 18 39 46 184 267 122 37 | 25 | 29 9 22 10 133 12 10 | 26 | 4 6 10 11 52 27 5 | 27 | 14 6 8 19 34 23 6 | 28E | 15 15 32 66 71 25 14 | 29 | 6 5 17 8 357 56 9 | 30E | 12 48 46 207 441 34 37 | 31 | 16 3 9 17 92 17 6 | ------|------------------------------| RMS | 25 20 90 102 220 57 | WRMS | 25 14 20 20 153 44 | MEDI | 14 7 17 17 158 25 |