Author: AC Coordinator / AIUB/CODE Rapid IGS Orbit Prediction Combination - Week 1046 Day: 1 (Jan 24, 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 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 | 18 EMP | 11 USP | 11 _______________________________________________________________________________ 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 1.1046.1 GPS week: 1046 Day: 1 MJD: 51567.0 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS --------|------------------------------------------------|--------------------- cop n/a|0.00-0.01-0.01 -0.25 0.35 -1.36 -0.4 0.29 0.29 | 0.0 0.0 0.0 emp n/a|0.00 0.00 0.03 0.06 0.23 -1.35 -0.4 0.32 0.32 | 0.0 0.0 0.0 gfp n/a|0.01 0.01 0.02 0.05 -0.49 0.14 0.1 0.72 0.30 | 0.0 0.0 0.0 sip n/a|0.05 0.02 0.03 -0.61 0.08 -1.27 -3.3 2.07 2.77 | 0.0 0.0 0.0 usp n/a|0.00 0.01 0.03 0.38 -0.40 3.49 1.0 0.85 0.87 | 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 2.1046.1 GPS week: 1046 Day: 1 MJD: 51567.0 Weighted Average PRN | cop emp gfp sip usp IGP | ------|--------------------------| 1E | 18 72 130 124 15 36 | 2 | 24 10 23 25 34 11 | 3 | 31 45 19 209 20 25 | 4 | 11 12 23 163 30 18 | 5 | 31 22 16 53 99 23 | 6 | 7 28 7 429 57 42 | 7 | 19 28 27 46 61 16 | 8 | 25 16 28 195 144 34 | 9 | 13 48 28 211 83 29 | 10 | 17 50 19 163 29 22 | 13E | 27 8 23 51 78 18 | X14 | 83 58 74 --- 126 48 | 15 | 36 27 8 397 42 40 | X16 | 82 76 50 556 --- 52 | 17 | 28 40 40 447 41 45 | 19 | 51 19 62 193 133 37 | 21 | 25 47 9 240 75 30 | 22 | 39 17 8 111 115 27 | 24 | 24 12 34 94 44 16 | 25 | 14 38 16 74 141 30 | 26E | 67 18 291 105 157 73 | 27 | 13 10 48 183 58 23 | 29E | 28 27 40 163 130 32 | 30 | 36 25 14 139 44 20 | 31 | 16 17 45 157 53 21 | ------|--------------------------| RMS | 29 32 72 207 85 | WRMS | 29 32 30 277 87 | MEDI | 25 27 27 163 60 |