Author: AC Coordinator / AIUB/CODE Rapid IGS Orbit Prediction Combination - Week 1050 Day: 1 (Feb 21, 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 | 19 SIP | 19 COP | 24 ESP | 19 ESP | 14 SIP | 15 USP | 15 USP | 1 COP | 14 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 -------+----- EMP | 14 COP | 19 EMP | 19 _______________________________________________________________________________ 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 1.1050.1 GPS week: 1050 Day: 1 MJD: 51595.0 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS --------|------------------------------------------------|--------------------- cop n/a|0.00 0.00 0.00 0.35 0.40 -1.05 -0.4 0.48 0.27 | 0.0 0.0 0.0 emp n/a|0.00 0.01 0.01 0.06 -0.06 -0.78 0.0 0.72 0.25 | 0.0 0.0 0.0 esp n/a|-.01-0.01 0.06 -0.04 -0.62 7.18 0.5 0.62 0.29 | 0.0 0.0 0.0 gfp n/a|0.00 0.00 0.00 0.20 -0.56 0.69 0.2 0.49 0.17 | 0.0 0.0 0.0 jpp n/a|0.00 0.00 0.01 -0.81 0.40 0.41 0.1 0.65 0.39 | 0.0 0.0 0.0 sip n/a|0.01-0.01-0.09 0.48 0.23 -1.65 -1.1 1.40 0.98 | 0.0 0.0 0.0 usp n/a|-.01 0.01-0.04 0.11 -0.06 0.24 0.6 1.26 0.35 | 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 2.1050.1 GPS week: 1050 Day: 1 MJD: 51595.0 Weighted Average PRN | cop emp esp gfp jpp sip usp IGP | ------|----------------------------------| 1 | 10 25 43 21 40 207 498 25 | 2 | 12 12 17 28 65 89 26 17 | 3 | 26 4 35 21 15 44 15 9 | 4E | 47 56 106 177 248 51 133 68 | 5 | 26 37 14 18 8 105 53 16 | 6 | 18 14 19 18 7 42 24 8 | 7 | 16 3 27 11 55 60 18 13 | 8 | 15 33 32 24 7 41 17 10 | 9 | 8 25 14 6 7 109 4 11 | 10 | 27 7 20 7 12 58 10 8 | 11E | 53 4 129 11 16 281 14 26 | X13 | 5 17 53 5 --- 56 23 9 | X15E | 138 20 331 85 --- 759 694 66 | X16 | 106 222 >>> 146 117 >>> --- 89 | 17 | 11 5 58 20 68 233 46 26 | X18 | 48 95 86 63 61 63 --- 34 | 21 | 46 11 27 12 12 166 27 18 | 22 | 14 27 15 8 27 76 20 11 | X24E | >>> 39 28 25 --- 23 50 21 | 25 | 30 34 13 15 9 51 58 15 | 26 | 32 11 34 10 33 48 8 10 | 27 | 45 22 15 11 9 30 49 14 | 29 | 178 306 188 113 81 325 196 86 | 30 | 8 9 19 6 9 24 14 5 | 31 | 22 19 41 10 12 153 7 15 | ------|----------------------------------| RMS | 48 72 62 49 65 140 126 | WRMS | 27 25 29 17 39 98 35 | MEDI | 26 20 32 18 16 63 24 |