Author: AC Coordinator / AIUB/CODE Rapid IGS Orbit Prediction Combination - Week 1054 Day: 1 (Mar 20, 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 | 16 ESP | 14 USP | 14 ESP | 16 USP | 9 ESP | 15 SIP | 15 USP | 19 ESP | 19 SIP | 19 SIP | ALL (high Transformation - See Table 1) COP | 14 JPP | 25 COP | 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 -------+----- EMP | 14 EMP | 15 COP | 16 EMP | 16 COP | 19 EMP | 19 _______________________________________________________________________________ Table 1.1054.1 GPS week: 1054 Day: 1 MJD: 51623.0 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS --------|------------------------------------------------|--------------------- cop n/a|0.00 0.01-0.03 -0.04 0.52 3.67 0.1 0.33 0.28 | 0.0 0.0 0.0 emp n/a|0.00 0.00 0.01 0.02 0.81 -2.41 -0.7 0.24 0.24 | 0.0 0.0 0.0 esp n/a|-.01 0.01-0.05 -0.09 1.06 2.11 -0.5 0.78 0.24 | 0.0 0.0 0.0 gfp n/a|-.01 0.00 0.01 -0.04 -0.66 -2.49 -0.4 0.58 0.35 | 0.0 0.0 0.0 jpp n/a|0.00 0.00 0.03 0.07 -3.29 -0.25 0.3 0.90 0.30 | 0.0 0.0 0.0 sip n/a|-.02 0.00 0.01 0.44 0.07 -5.73 -2.7 2.10 1.94 | 0.0 0.0 0.0 usp n/a|0.01 0.00-0.03 0.08 0.10 0.84 0.9 1.78 0.39 | 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 2.1054.1 GPS week: 1054 Day: 1 MJD: 51623.0 Weighted Average PRN | cop emp esp gfp jpp sip usp IGP | ------|----------------------------------| 1 | 12 21 22 42 17 294 22 10 | 2 | 37 36 12 25 24 261 19 13 | 3 | 14 19 24 16 31 102 21 9 | 4E | 25 16 31 86 86 258 34 21 | 5 | 19 10 18 7 17 188 11 6 | 6 | 15 11 14 30 4 132 21 8 | 7 | 24 38 14 26 25 215 49 15 | X8E | 46 42 151 115 --- 139 --- 47 | 9E | 13 39 135 134 112 88 817 194 | 10 | 39 21 17 31 25 48 30 13 | 11E | 27 15 128 128 6 192 18 28 | 13 | 25 16 18 11 12 268 15 8 | 17E | 53 28 67 56 78 26 51 23 | 18 | 38 25 149 91 132 25 10 34 | 21 | 64 21 33 27 12 245 11 15 | 22 | 24 23 6 6 12 122 65 14 | 24E | 11 17 95 68 130 141 64 29 | 25E | 48 14 108 70 313 207 55 64 | 26 | 56 22 38 27 38 326 37 16 | 27E | 10 44 206 36 121 91 90 40 | 29 | 38 12 40 37 21 399 17 12 | 30 | 12 12 20 10 13 70 11 6 | 31 | 33 15 23 32 29 329 14 11 | ------|----------------------------------| RMS | 33 24 78 58 90 210 178 | WRMS | 28 24 24 35 30 194 39 | MEDI | 25 21 31 32 25 188 22 |