Author: AC Coordinator / AIUB/CODE Rapid IGS Orbit Prediction Combination - Week 1088 Day: 0 (Nov 12, 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 | 15 SIP | 19 SIP | 6 SIP | 24 SIP | 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 | 15 _______________________________________________________________________________ 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 1.1088.0 GPS week: 1088 Day: 0 MJD: 51860.0 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS --------|------------------------------------------------|--------------------- cop n/a|0.00 0.00-0.04 0.42 -0.44 0.83 -0.2 0.23 0.23 | 0.0 0.0 0.00 emp n/a|0.00 0.00 0.00 0.40 -0.04 -1.28 0.3 0.26 0.15 | 0.0 0.0 0.00 esp n/a|-.01 0.00 0.08 -0.46 0.71 1.35 -0.4 0.53 0.19 | 0.0 0.0 0.00 gfp n/a|-.01 0.01-0.04 -0.29 -0.56 0.24 0.0 0.54 0.19 | 0.0 0.0 0.00 sip n/a|0.01 0.00-0.03 0.40 0.43 -6.23 -0.4 1.59 1.35 | 0.0 0.0 0.00 usp n/a|0.01 0.00-0.02 -1.70 0.94 -0.98 0.3 0.79 0.27 | 0.0 0.0 0.00 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 2.1088.0 GPS week: 1088 Day: 0 MJD: 51860.0 Weighted Average PRN | cop emp esp gfp sip usp IGP | ------|------------------------------| 1 | 9 8 13 14 64 21 6 | 2 | 8 9 11 71 223 163 28 | 3 | 9 6 23 26 39 17 8 | 4 | 6 11 12 16 27 28 7 | 5 | 55 45 55 114 135 68 33 | 6 | 6 3 12 8 420 12 4 | 7 | 7 13 20 14 37 16 7 | 8 | 12 11 20 28 183 29 9 | 9 | 13 8 11 22 46 10 6 | 10E | 42 19 31 57 60 34 18 | 11 | 15 9 44 13 52 45 13 | 13 | 13 10 22 14 66 28 8 | 17 | 7 5 7 13 267 10 4 | X19 | 110 70 82 179 969 --- 63 | 20E | 40 74 158 94 38 77 45 | 21E | 31 34 95 21 235 13 24 | 22 | 46 48 74 21 104 186 37 | X24 | 72 101 161 166 376 --- 69 | 25 | 8 6 13 20 22 18 6 | 26 | 8 12 8 11 278 35 7 | 27 | 11 5 14 17 206 15 6 | 28E | 17 25 48 77 41 74 22 | 29 | 18 13 14 9 46 16 7 | 30 | 15 51 118 161 86 234 54 | 31 | 25 5 11 16 124 33 9 | ------|------------------------------| RMS | 23 26 53 54 159 79 | WRMS | 23 15 19 19 135 27 | MEDI | 13 11 20 21 86 28 |