Author: AC Coordinator / AIUB/CODE Rapid IGS Orbit Prediction Combination - Week 1076 Day: 6 (Aug 26, 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 SIP | 15 SIP | 31 ESP | 24 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 COP | 24 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 1.1076.6 GPS week: 1076 Day: 6 MJD: 51782.0 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS --------|------------------------------------------------|--------------------- cop n/a|-.01-0.01-0.01 -0.02 -0.55 -2.81 -0.1 0.26 0.27 | 0.0 0.0 0.0 emp n/a|0.00 0.00-0.01 -0.22 -0.67 0.96 -0.3 0.23 0.19 | 0.0 0.0 0.0 esp n/a|0.00 0.00-0.03 0.15 0.38 0.62 0.5 0.74 0.16 | 0.0 0.0 0.0 gfp n/a|0.00 0.01 0.00 -0.22 0.30 0.87 0.2 0.32 0.22 | 0.0 0.0 0.0 jpp n/a|0.00-0.01 0.00 0.56 0.73 2.46 0.6 0.44 0.23 | 0.0 0.0 0.0 sip n/a|0.01 0.00-0.01 -0.11 0.88 0.03 0.6 1.54 0.84 | 0.0 0.0 0.0 usp n/a|0.00 0.00 0.03 0.07 0.67 0.13 -0.4 0.45 0.29 | 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 2.1076.6 GPS week: 1076 Day: 6 MJD: 51782.0 Weighted Average PRN | cop emp esp gfp jpp sip usp IGP | ------|----------------------------------| 1 | 7 2 15 13 9 14 12 4 | 2 | 15 7 10 17 14 52 45 8 | X3 | 28 8 41 19 39 --- 13 11 | 4E | 28 53 271 96 143 300 146 53 | 5 | 19 8 8 23 11 34 7 6 | 6 | 16 20 15 16 16 155 31 11 | 7 | 17 5 6 14 16 72 12 6 | 8 | 8 41 16 15 17 13 42 11 | 9 | 12 23 11 21 11 99 36 10 | 10 | 9 7 21 9 16 160 15 10 | 11E | 11 51 211 51 46 76 19 32 | 13 | 6 5 9 11 16 31 17 5 | 16 | 25 21 11 50 13 159 25 15 | 17E | 18 12 54 40 115 15 90 23 | X19E | 64 43 44 82 56 94 --- 27 | 20 | 7 9 14 16 12 44 12 5 | 21 | 102 18 25 18 44 247 24 25 | 22 | 29 18 16 12 10 225 10 15 | 25E | 14 12 14 35 50 301 47 20 | 26 | 19 7 14 22 19 35 21 7 | 27E | 11 15 17 16 31 48 32 8 | 28 | 19 30 15 34 13 89 63 14 | 29 | 12 29 16 11 15 73 6 8 | 30 | 16 9 18 12 10 19 5 5 | 31 | 7 10 24 29 25 371 10 24 | ------|----------------------------------| RMS | 26 23 74 32 44 155 45 | WRMS | 26 19 16 22 23 84 29 | MEDI | 16 12 16 18 16 75 20 |