Author: AC Coordinator / AIUB/CODE Rapid IGS Orbit Prediction Combination - Week 1062 Day: 6 (May 20, 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 | 2 _______________________________________________________________________________ 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 1.1062.6 GPS week: 1062 Day: 6 MJD: 51684.0 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS --------|------------------------------------------------|--------------------- cop n/a|0.00 0.00 0.03 0.01 -0.17 0.18 -0.3 0.31 0.32 | 0.0 0.0 0.0 emp n/a|0.00 0.00-0.01 0.64 0.05 1.20 0.5 0.20 0.20 | 0.0 0.0 0.0 esp n/a|0.00 0.01-0.04 -0.83 -0.51 -2.36 0.0 0.40 0.16 | 0.0 0.0 0.0 gfp n/a|0.00 0.01 0.02 0.02 0.38 0.42 -0.3 0.40 0.24 | 0.0 0.0 0.0 jpp n/a|0.00 0.00 0.00 -0.10 0.28 0.65 -0.6 0.69 0.80 | 0.0 0.0 0.0 sip n/a|0.01-0.01 0.01 -1.20 -0.62 -3.83 0.4 1.24 1.27 | 0.0 0.0 0.0 usp n/a|0.01 0.00 0.02 -0.67 0.21 -0.31 0.1 2.50 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 2.1062.6 GPS week: 1062 Day: 6 MJD: 51684.0 Weighted Average PRN | cop emp esp gfp jpp sip usp IGP | ------|----------------------------------| 1 | 39 8 13 9 14 139 15 12 | 2 | 38 54 16 39 99 238 >>> 131 | 3 | 7 19 19 25 12 44 15 8 | 4 | 33 10 13 8 18 78 17 9 | 5 | 53 16 22 19 17 79 322 34 | 6 | 23 11 12 23 7 35 7 7 | 7 | 8 23 10 13 12 189 23 14 | 8 | 29 12 15 4 46 15 33 9 | 9 | 13 21 23 8 9 47 5 7 | 10E | 29 18 166 156 188 164 27 48 | 11 | 33 9 14 12 37 74 29 10 | 13 | 12 15 14 18 39 185 13 14 | 15 | 17 8 18 6 14 85 7 7 | 16E | 32 38 69 44 205 32 65 32 | 17 | 16 8 15 8 24 295 131 24 | X18 | 14 22 63 17 --- 158 41 19 | 19 | 19 15 7 4 10 88 67 10 | 21E | 95 12 43 24 142 94 126 29 | 22 | 29 21 15 7 18 21 177 19 | 24 | 4 9 20 10 13 102 45 9 | 25 | 20 11 18 16 22 30 16 7 | 26 | 9 11 18 8 13 163 10 12 | 27 | 18 15 16 8 32 19 5 7 | 29 | 22 21 22 24 11 192 8 15 | 30 | 13 33 14 83 43 29 163 24 | 31 | 27 6 10 18 8 19 10 6 | ------|----------------------------------| RMS | 31 20 40 40 69 124 251 | WRMS | 32 20 16 24 80 127 44 | MEDI | 21 15 16 15 18 82 25 |