Author: AC Coordinator / AIUB/CODE Rapid IGS Orbit Prediction Combination - Week 1095 Day: 3 (Jan 03, 2001) Contacts: R. Weber (rweber@terra.tuwien.ac.at), 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 | 17 SIP | ALL (high Transformation - See Table 1) _______________________________________________________________________________ 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 1.1095.3 GPS week: 1095 Day: 3 MJD: 51912.0 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS --------|------------------------------------------------|--------------------- cop n/a|-.01 0.00-0.09 0.69 0.12 1.84 -0.6 0.59 0.57 | 0.0 0.0 0.00 emp n/a|0.00 0.00 0.03 -0.07 0.82 -0.66 -0.3 0.50 0.34 | 0.0 0.0 0.00 esp n/a|0.00 0.00 0.05 -0.23 -0.54 -0.01 0.2 0.22 0.11 | 0.0 0.0 0.00 gfp n/a|-.01 0.00-0.07 0.11 1.07 -1.15 -0.5 0.88 0.86 | 0.0 0.0 0.00 sip n/a|-.01 0.02 0.01 0.26 -0.11 7.59 1.8 0.85 0.62 | 0.0 0.0 0.00 usp n/a|0.00 0.00-0.14 0.26 -0.40 -0.42 0.4 0.98 0.90 | 0.0 0.0 0.00 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 2.1095.3 GPS week: 1095 Day: 3 MJD: 51912.0 Weighted Average PRN | cop emp esp gfp sip usp IGP | ------|------------------------------| 1E | 110 60 13 238 59 46 49 | 2 | 16 12 20 22 25 125 19 | 3 | 10 25 26 34 58 283 40 | 4 | 40 7 9 27 46 9 10 | 5 | 8 14 7 8 26 59 9 | 6 | 145 104 73 39 199 113 46 | 7 | 26 42 39 113 93 88 29 | 8 | 16 10 7 7 54 36 7 | 9 | 13 21 6 18 60 50 9 | 10 | 40 24 6 19 27 8 10 | 11 | 9 18 13 12 85 32 8 | 13E | 62 37 23 36 121 126 24 | 14E | 43 47 11 99 44 93 25 | X15 | 12 --- --- 15 189 8 9 | X17 | 64 91 8 184 449 --- 48 | 19 | 23 9 13 21 40 105 16 | 20 | 19 40 15 25 68 42 13 | 21 | 17 6 11 8 84 50 9 | 22 | 13 11 12 27 19 20 8 | X24 | 25 8 6 19 178 --- 8 | 25 | 25 11 13 17 22 26 8 | 26E | 122 145 11 273 133 118 64 | 27 | 29 9 8 18 50 15 7 | 28 | 14 24 9 7 171 40 9 | X29E | 35 44 45 134 115 --- 37 | 30 | 63 12 9 12 59 33 14 | 31 | 124 111 22 122 99 191 48 | ------|------------------------------| RMS | 59 50 22 88 85 98 | WRMS | 57 34 11 86 62 90 | MEDI | 25 23 12 22 60 48 |