Author: AC Coordinator / AIUB/CODE Rapid IGS Orbit Prediction Combination - Week 1075 Day: 1 (Aug 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 -------+--------------- ESP | 24 COP | 15 USP | 19 USP | 24 ESP | 29 COP | 19 ESP | 19 SIP | 19 ESP | 2 SIP | 7 COP | 16 SIP | 1 JPP | 4 SIP | 17 SIP | 4 SIP | ALL COP | 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 -------+----- EMP | 15 ESP | 16 EMP | 19 EMP | 24 COP | 28 JPP | 28 _______________________________________________________________________________ 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 1.1075.1 GPS week: 1075 Day: 1 MJD: 51770.0 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS --------|------------------------------------------------|--------------------- cop n/a|0.00 0.01 0.01 0.89 1.23 -1.98 0.2 0.44 0.45 | 0.0 0.0 0.0 emp n/a|-.01 0.00-0.04 0.28 -1.21 1.08 -0.3 0.22 0.21 | 0.0 0.0 0.0 esp n/a|0.00-0.01-0.04 0.68 0.81 -1.19 0.4 1.36 0.13 | 0.0 0.0 0.0 gfp n/a|0.00 0.01 0.03 -0.45 -0.94 -0.33 -0.2 0.30 0.15 | 0.0 0.0 0.0 jpp n/a|0.00 0.00 0.00 -0.76 0.25 1.15 0.0 0.95 0.92 | 0.0 0.0 0.0 sip n/a|0.00 0.00-0.03 0.72 -1.75 3.59 0.7 1.92 1.68 | 0.0 0.0 0.0 usp n/a|0.00 0.00 0.04 -0.16 0.18 0.50 0.1 0.47 0.40 | 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 2.1075.1 GPS week: 1075 Day: 1 MJD: 51770.0 Weighted Average PRN | cop emp esp gfp jpp sip usp IGP | ------|----------------------------------| X1 | 7 32 15 12 8 399 --- 9 | 2 | 21 21 603 32 9 64 53 175 | 3 | 32 33 10 15 8 64 19 8 | 4E | 69 25 23 84 419 288 110 127 | 5 | 39 21 6 12 14 30 11 7 | 6 | 48 29 21 24 13 155 21 11 | 7 | 31 15 10 11 12 473 12 6 | 8 | 17 31 11 15 11 98 22 8 | 9 | 5 14 7 11 4 31 15 4 | 10 | 83 13 10 22 7 125 8 11 | 11E | 52 29 60 80 59 156 68 27 | 13 | 27 33 12 8 9 295 102 16 | 17 | 72 7 20 13 19 338 68 14 | 20 | 14 12 9 5 5 69 13 4 | 21 | 74 10 20 18 9 30 20 11 | 22 | 33 16 12 7 11 65 10 6 | 25 | 34 18 5 6 13 193 14 6 | 26 | 16 15 14 11 8 196 82 12 | 27 | 10 41 10 4 17 190 9 9 | X29 | 28 24 >>> 33 --- 133 123 429 | 30 | 46 12 8 14 8 76 22 7 | 31 | 47 15 12 9 16 123 14 8 | ------|----------------------------------| RMS | 44 22 136 30 95 192 47 | WRMS | 45 21 13 15 92 168 40 | MEDI | 33 20 12 13 11 129 20 |