Author: AC Coordinator / AIUB/CODE Rapid IGS Orbit Prediction Combination - Week 1066 Day: 4 (Jun 15, 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 | 16 ESP | 16 USP | 16 SIP | 1 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 | 16 _______________________________________________________________________________ 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 1.1066.4 GPS week: 1066 Day: 4 MJD: 51710.0 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS --------|------------------------------------------------|--------------------- cop n/a|0.00 0.00 0.01 -0.15 -0.21 1.50 -0.2 0.36 0.26 | 0.0 0.0 0.0 emp n/a|0.00 0.00-0.01 0.32 -0.40 -0.73 0.1 0.21 0.21 | 0.0 0.0 0.0 esp n/a|0.00 0.01-0.01 0.68 -0.23 -5.49 0.4 1.23 0.46 | 0.0 0.0 0.0 gfp n/a|-.01 0.00 0.00 1.11 0.17 -0.01 0.0 0.65 0.50 | 0.0 0.0 0.0 jpp n/a|0.00 0.00-0.02 -1.38 1.67 0.20 0.0 0.66 1.03 | 0.0 0.0 0.0 sip n/a|-.01 0.00-0.03 -0.06 -0.01 -0.95 0.3 1.80 0.85 | 0.0 0.0 0.0 usp n/a|0.01 0.00 0.01 -0.16 -0.49 -0.28 0.7 0.60 0.33 | 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 2.1066.4 GPS week: 1066 Day: 4 MJD: 51710.0 Weighted Average PRN | cop emp esp gfp jpp sip usp IGP | ------|----------------------------------| 1 | 28 14 18 7 16 545 12 48 | 2 | 7 4 42 17 23 55 20 7 | 3E | 32 25 298 111 58 240 116 34 | 4 | 5 5 9 7 31 263 34 22 | 5 | 5 18 22 16 13 11 28 8 | 6E | 60 49 267 99 116 70 11 31 | 7E | 9 10 237 125 98 266 107 37 | 8 | 3 13 12 17 14 98 37 11 | 9 | 25 7 26 18 14 40 17 8 | 10E | 15 24 120 79 77 201 65 27 | 11 | 8 10 9 12 8 136 64 15 | 13 | 8 7 20 10 42 306 17 25 | 15 | 24 4 25 7 11 123 7 11 | 17 | 25 14 36 7 23 164 14 15 | 18 | 41 15 15 19 19 36 146 25 | 19 | 67 3 32 29 16 45 143 27 | X20E | 12 --- 87 105 8 249 34 37 | 21E | 25 38 297 86 87 55 16 24 | 22 | 9 4 22 32 13 129 5 12 | 24 | 129 56 168 205 187 165 85 57 | 25 | 25 7 14 28 10 41 6 8 | 26 | 19 6 34 11 17 106 14 10 | 27 | 7 5 10 14 11 28 19 5 | 29 | 7 6 26 23 13 96 18 9 | 30 | 5 3 24 8 14 100 12 8 | 31E | 21 24 148 76 162 138 32 33 | ------|----------------------------------| RMS | 36 21 123 65 66 180 60 | WRMS | 26 21 46 50 103 85 33 | MEDI | 17 10 26 19 17 115 20 |