Author: AC Coordinator / AIUB/CODE Rapid IGS Orbit Prediction Combination - Week 1077 Day: 2 (Aug 29, 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 | 24 ESP | 24 COP | 24 SIP | 15 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 EMP | 15 EMP | 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 1.1077.2 GPS week: 1077 Day: 2 MJD: 51785.0 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS --------|------------------------------------------------|--------------------- cop n/a|0.01-0.01 0.03 -0.29 -0.22 -0.52 -0.1 0.45 0.32 | 0.0 0.0 0.0 emp n/a|0.01 0.00-0.02 0.40 0.11 -0.78 -0.2 0.30 0.35 | 0.0 0.0 0.0 esp n/a|-.01 0.00-0.03 -0.53 0.96 1.54 0.6 0.95 0.84 | 0.0 0.0 0.0 gfp n/a|0.00 0.00 0.01 -0.86 -0.92 2.05 0.0 1.11 1.03 | 0.0 0.0 0.0 jpp n/a|-.01 0.00-0.03 1.49 -1.07 -0.02 0.8 1.23 1.07 | 0.0 0.0 0.0 sip n/a|0.04-0.03-0.01 0.10 -0.11 -0.89 -0.1 1.06 0.94 | 0.0 0.0 0.0 usp n/a|0.01 0.00 0.01 0.01 0.35 -0.03 0.0 0.53 0.50 | 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 2.1077.2 GPS week: 1077 Day: 2 MJD: 51785.0 Weighted Average PRN | cop emp esp gfp jpp sip usp IGP | ------|----------------------------------| 1 | 93 96 252 256 275 84 96 63 | 2 | 8 17 30 20 16 109 35 12 | 3 | 20 6 17 18 22 61 5 8 | 4E | 52 11 45 222 81 140 82 34 | 5 | 29 9 33 24 97 143 71 21 | 6 | 17 25 31 21 17 236 6 22 | 7 | 37 15 67 88 83 52 60 21 | 8E | 7 9 35 16 15 26 38 9 | X9E | 13 9 95 83 24 30 --- 20 | 10 | 5 13 10 9 21 85 11 9 | 11E | 38 8 117 99 42 129 42 25 | 13 | 8 7 10 11 12 45 19 6 | 16 | 151 23 191 232 226 131 86 56 | 17E | 27 38 225 88 81 44 47 36 | 19E | 10 19 97 108 296 81 34 37 | 20 | 19 7 12 7 25 131 13 12 | 21 | 56 17 42 10 76 59 47 18 | 22 | 14 17 68 57 49 107 36 17 | X25E | 48 48 299 105 140 201 --- 60 | 26 | 13 16 11 16 19 30 7 6 | 27E | 14 65 71 231 275 13 120 47 | 28 | 18 32 57 68 43 68 23 16 | X29 | 4 8 76 41 --- 279 --- 36 | 30 | 16 8 15 15 23 155 52 16 | 31 | 6 10 8 11 8 103 19 10 | ------|----------------------------------| RMS | 45 30 95 111 123 106 53 | WRMS | 32 35 84 103 107 94 50 | MEDI | 17 15 45 41 43 85 37 |