Author: AC Coordinator / AIUB/CODE Rapid IGS Orbit Prediction Combination - Week 1069 Day: 2 (Jul 04, 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 USP | 15 COP | 11 EMP | 11 COP | 16 SIP | 15 SIP | 24 EMP | 29 COP | 29 SIP | 11 EMP | 22 SIP | ALL (high Transformation - See Table 1) COP | 17 EMP | 17 ESP | 24 ESP | 15 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 EMP | 15 ESP | 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 1.1069.2 GPS week: 1069 Day: 2 MJD: 51729.0 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS --------|------------------------------------------------|--------------------- cop n/a|-.01 0.00 0.04 -0.13 0.21 2.28 -0.1 4.96 0.36 | 0.0 0.0 0.0 emp n/a|0.00 0.00 0.02 -0.25 0.87 1.46 0.4 4.72 0.44 | 0.0 0.0 0.0 esp n/a|0.00 0.00-0.15 0.49 0.22 -0.73 0.3 0.48 0.22 | 0.0 0.0 0.0 gfp n/a|0.00 0.01 0.03 -0.18 -0.22 0.64 -0.1 0.35 0.20 | 0.0 0.0 0.0 jpp n/a|0.00 0.00 0.00 -0.04 -0.56 -2.52 0.1 0.41 0.33 | 0.0 0.0 0.0 sip n/a|0.02-0.02 0.07 0.11 -0.99 6.87 1.6 1.84 1.69 | 0.0 0.0 0.0 usp n/a|0.00 0.00 0.03 0.38 -0.94 -2.32 0.0 0.81 0.81 | 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 2.1069.2 GPS week: 1069 Day: 2 MJD: 51729.0 Weighted Average PRN | cop emp esp gfp jpp sip usp IGP | ------|----------------------------------| 1 | 45 32 25 13 9 143 199 23 | 2 | 30 26 28 24 38 53 22 13 | 3E | 34 38 22 39 23 195 34 15 | 4 | 15 19 15 10 9 71 18 6 | 5 | 31 16 22 13 14 104 17 9 | 6E | 86 69 123 75 13 155 58 34 | 7E | 13 25 149 65 52 50 46 32 | 8 | 8 22 23 9 8 122 123 14 | 9 | 11 21 18 7 25 79 106 13 | 10 | 46 11 24 15 36 250 24 13 | 11 | >>> >>> 16 32 28 528 97 960 | 13 | 21 17 25 14 13 146 34 8 | 17 | 472 393 8 11 28 126 27 190 | 19 | 37 66 17 28 13 238 177 24 | 20 | 16 12 22 6 8 115 59 8 | 21 | 13 32 18 16 28 87 59 12 | 22 | 152 501 48 36 43 115 51 127 | X24 | 97 27 378 81 --- 994 --- 143 | 25 | 9 4 15 17 11 56 109 12 | 26 | 24 32 13 31 14 111 21 11 | 27 | 10 9 20 9 4 159 59 8 | X29 | 672 944 19 13 11 77 --- 460 | 30 | 29 21 15 14 15 89 24 9 | 31E | 23 13 60 95 156 322 20 40 | ------|----------------------------------| RMS | 496 472 48 35 41 184 81 | WRMS | 36 44 22 20 33 169 81 | MEDI | 30 26 22 16 14 119 49 |