Author: AC Coordinator / AIUB/CODE Rapid IGS Orbit Prediction Combination - Week 1069 Day: 3 (Jul 05, 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 -------+--------------- COP | 16 COP | 15 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 -------+----- ESP | 16 USP | 16 EMP | 18 ESP | 18 _______________________________________________________________________________ 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 1.1069.3 GPS week: 1069 Day: 3 MJD: 51730.0 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS --------|------------------------------------------------|--------------------- cop n/a|0.00 0.01 0.06 -0.61 0.11 1.94 -0.2 0.99 0.37 | 0.0 0.0 0.0 emp n/a|0.00-0.01-0.02 -0.77 0.79 1.96 0.6 0.52 0.35 | 0.0 0.0 0.0 esp n/a|-.01 0.00-0.04 0.06 0.41 -1.20 0.2 0.24 0.20 | 0.0 0.0 0.0 gfp n/a|-.01 0.01 0.04 -0.10 0.02 -0.19 -0.2 0.32 0.24 | 0.0 0.0 0.0 jpp n/a|0.01 0.00 0.02 0.92 -2.00 2.23 0.0 0.61 0.50 | 0.0 0.0 0.0 sip n/a|0.01-0.06 0.06 0.00 -0.91 6.51 1.6 1.24 1.67 | 0.0 0.0 0.0 usp n/a|0.01-0.01 0.00 0.23 -0.91 -4.30 -0.4 1.01 1.05 | 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 2.1069.3 GPS week: 1069 Day: 3 MJD: 51730.0 Weighted Average PRN | cop emp esp gfp jpp sip usp IGP | ------|----------------------------------| 1 | 16 15 8 32 20 197 181 20 | 2 | 32 47 20 28 60 99 54 16 | 3E | 8 47 33 21 119 62 35 23 | 4 | 59 19 8 7 24 43 30 10 | 5 | 33 21 8 10 14 83 30 7 | X6E | 57 27 103 102 --- 40 32 44 | 7E | 23 28 31 56 32 100 40 17 | 8 | 14 20 16 12 16 61 116 13 | 9 | 9 13 14 8 56 137 74 12 | 10 | 77 40 12 27 22 52 79 16 | 11 | 156 40 48 57 27 121 78 28 | 13 | 20 12 16 22 22 45 31 9 | X15 | 610 112 150 171 --- --- 268 141 | 17 | 120 39 23 26 13 70 32 19 | 19 | 32 72 16 21 13 248 146 21 | 20 | 26 20 6 25 18 126 308 31 | 21 | 52 47 13 9 40 75 78 15 | 22 | 306 51 11 24 35 56 74 40 | 24 | 250 182 45 68 92 108 88 51 | 25 | 31 10 12 8 16 292 64 9 | 26 | 10 8 15 29 16 46 78 11 | 27 | 19 11 11 9 18 99 50 7 | X29 | 225 20 43 9 33 74 --- 35 | 30 | 40 40 6 9 64 125 23 14 | 31E | 44 34 54 62 199 106 28 38 | ------|----------------------------------| RMS | 99 52 24 32 61 124 101 | WRMS | 37 35 20 24 50 167 105 | MEDI | 33 28 16 24 24 91 69 |