Author: AC Coordinator / AIUB/CODE Rapid IGS Orbit Prediction Combination - Week 1079 Day: 6 (Sep 16, 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 -------+--------------- COP | 16 SIP | 15 SIP | 16 JPP | 27 JPP | 25 ESP | 19 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 _______________________________________________________________________________ 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 1.1079.6 GPS week: 1079 Day: 6 MJD: 51803.0 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS --------|------------------------------------------------|--------------------- cop n/a|-.01 0.00 0.01 -0.82 0.63 -1.27 -0.6 0.29 0.27 | 0.0 0.0 0.0 emp n/a|0.00 0.00-0.01 0.19 -0.51 0.47 0.2 0.17 0.11 | 0.0 0.0 0.0 esp n/a|-.01 0.00-0.01 0.10 2.19 -0.21 0.9 1.17 0.21 | 0.0 0.0 0.0 gfp n/a|0.00 0.00 0.01 0.14 -0.15 -0.61 -0.3 0.52 0.17 | 0.0 0.0 0.0 jpp n/a|-.01-0.01 0.01 0.33 -0.61 2.28 0.6 1.27 0.28 | 0.0 0.0 0.0 sip n/a|-.01 0.00 0.03 0.29 0.62 0.24 0.5 1.10 1.00 | 0.0 0.0 0.0 usp n/a|-.01 0.01 0.01 0.26 0.46 0.06 0.0 0.57 0.25 | 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 2.1079.6 GPS week: 1079 Day: 6 MJD: 51803.0 Weighted Average PRN | cop emp esp gfp jpp sip usp IGP | ------|----------------------------------| 1 | 9 13 8 21 36 138 13 10 | 2 | 18 4 15 15 16 182 35 12 | X3 | 14 14 39 6 12 --- 8 6 | 4E | 9 6 91 41 27 39 13 11 | 5 | 6 4 13 13 11 18 9 3 | 6 | 11 6 19 8 18 92 31 8 | 7 | 14 11 17 10 40 83 20 8 | 8E | 42 55 72 72 125 243 156 36 | 9E | 33 29 251 71 62 87 14 27 | 10 | 17 4 29 15 14 160 6 10 | 11E | 25 4 145 15 26 72 19 15 | 13 | 10 5 5 13 12 115 23 8 | X16 | >>> 14 29 --- 40 >>> --- >>> | 17E | 35 7 128 26 140 38 18 22 | 19E | 64 14 382 105 234 95 27 53 | 20 | 10 3 9 6 23 136 10 8 | 21 | 38 13 17 26 15 99 38 12 | 22 | 21 9 41 16 30 24 15 8 | 24E | 43 32 129 127 43 26 13 24 | X25E | 33 --- 40 --- 439 60 55 123 | 26 | 16 7 19 21 14 35 5 5 | 27E | 61 23 179 141 516 227 199 86 | 28 | 18 14 13 13 28 42 12 7 | 29 | 8 3 11 10 12 57 15 5 | 30 | 8 8 16 15 15 11 49 8 | 31 | 37 18 24 8 11 26 7 9 | ------|----------------------------------| RMS | 29 17 117 52 127 110 57 | WRMS | 27 11 21 17 28 100 25 | MEDI | 18 9 27 15 27 83 15 |