Author: AC Coordinator / AIUB/CODE Rapid IGS Orbit Prediction Combination - Week 1053 Day: 2 (Mar 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 -------+--------------- SIP | 18 ESP | 18 ESP | 15 USP | 16 USP | 8 USP | 9 JPP | 4 ESP | 16 SIP | 29 ESP | ALL (high Transformation - See Table 1) 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 | 15 COP | 18 _______________________________________________________________________________ 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 1.1053.2 GPS week: 1053 Day: 2 MJD: 51617.0 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS --------|------------------------------------------------|--------------------- cop n/a|0.00-0.01-0.01 -0.20 -0.23 0.57 -0.2 0.36 0.28 | 0.0 0.0 0.0 emp n/a|0.00 0.00 0.03 -0.39 -0.93 0.34 0.0 0.22 0.22 | 0.0 0.0 0.0 esp n/a|-.01 0.01 0.15 -0.74 -1.53 -5.45 0.4 1.29 0.39 | 0.0 0.0 0.0 gfp n/a|0.00-0.01 0.00 1.33 1.55 0.09 0.3 0.73 0.21 | 0.0 0.0 0.0 jpp n/a|-.01-0.01 0.05 -1.25 0.54 -1.10 -0.1 2.11 1.18 | 0.0 0.0 0.0 sip n/a|0.01 0.01-0.01 0.24 0.24 1.34 1.1 2.22 1.74 | 0.0 0.0 0.0 usp n/a|-.01 0.01 0.00 0.00 0.21 -0.15 0.1 3.25 0.54 | 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 2.1053.2 GPS week: 1053 Day: 2 MJD: 51617.0 Weighted Average PRN | cop emp esp gfp jpp sip usp IGP | ------|----------------------------------| 1 | 19 20 34 22 8 256 30 18 | 2 | 8 17 17 4 27 37 11 6 | 3 | 38 12 20 8 12 276 16 19 | 4E | 31 19 318 141 751 147 67 119 | 5 | 21 7 15 8 8 37 15 6 | 6 | 7 6 18 16 9 121 20 9 | 7 | 15 12 22 25 14 65 16 8 | 8E | 12 17 215 155 333 182 >>> 275 | 9E | 35 27 66 108 240 156 856 203 | 10 | 48 19 56 15 29 18 37 14 | 11E | 101 71 307 41 45 327 48 37 | 13 | 29 11 48 16 13 105 54 14 | X14 | 77 16 162 31 --- --- 101 35 | X16 | 202 160 757 --- --- 280 >>> 623 | 17E | 14 26 220 55 46 85 11 15 | X19E | 33 60 84 --- 402 68 124 73 | 21 | 6 19 60 7 29 453 5 28 | 22 | 16 6 25 22 41 43 15 9 | X24E | 64 40 36 --- --- 105 33 29 | X25E | 112 23 166 --- 404 361 104 80 | 26 | 24 7 59 11 17 147 7 11 | 27E | 51 11 130 206 380 239 111 69 | 29 | 12 14 52 27 9 573 35 40 | 30 | 6 4 15 20 13 59 18 7 | 31 | 56 6 37 33 34 38 16 15 | ------|----------------------------------| RMS | 36 22 129 73 211 222 325 | WRMS | 28 22 39 21 118 174 54 | MEDI | 29 17 56 22 29 134 33 |