Author: AC Coordinator / AIUB/CODE Rapid IGS Orbit Prediction Combination - Week 1055 Day: 3 (Mar 29, 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 -------+--------------- ESP | 14 ESP | 15 USP | 24 SIP | 19 SIP | ALL (high Transformation - See Table 1) JPP | 8 USP | 25 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 | 14 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 1.1055.3 GPS week: 1055 Day: 3 MJD: 51632.0 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS --------|------------------------------------------------|--------------------- cop n/a|0.00 0.00-0.01 0.13 -0.77 1.30 -0.5 0.55 0.46 | 0.0 0.0 0.0 emp n/a|0.00 0.00-0.01 0.07 -0.21 -0.65 -0.3 0.20 0.20 | 0.0 0.0 0.0 esp n/a|-.01 0.00-0.06 0.15 0.48 0.98 -0.7 0.92 0.32 | 0.0 0.0 0.0 gfp n/a|0.00 0.01 0.02 -0.05 -0.56 -0.67 -0.5 0.51 0.18 | 0.0 0.0 0.0 jpp n/a|0.00 0.00-0.02 -0.26 3.18 0.21 0.7 1.04 0.67 | 0.0 0.0 0.0 sip n/a|0.01 0.02-0.02 -0.07 -0.60 6.32 1.2 1.46 1.54 | 0.0 0.0 0.0 usp n/a|0.00 0.00 0.00 -0.28 -0.45 0.98 0.6 0.98 0.30 | 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 2.1055.3 GPS week: 1055 Day: 3 MJD: 51632.0 Weighted Average PRN | cop emp esp gfp jpp sip usp IGP | ------|----------------------------------| 1 | 38 7 18 7 22 78 27 8 | 2 | 21 12 19 12 25 175 16 7 | 3 | 20 9 56 13 24 82 12 8 | 4E | 24 6 72 121 217 324 18 39 | 5 | 14 21 24 20 22 164 50 12 | 6 | 17 17 55 18 26 42 8 9 | 7 | 15 6 44 13 8 178 7 6 | 8E | 67 53 122 102 396 207 51 75 | 9 | 181 41 263 23 138 103 221 58 | 10 | 23 12 23 32 17 80 16 9 | 11E | 38 30 187 113 47 120 27 30 | 13 | 26 12 20 13 44 63 28 10 | 16 | 24 32 18 22 38 220 62 16 | 17E | 88 15 189 122 15 142 28 32 | 18 | 28 7 15 5 29 46 15 7 | X19 | 36 38 146 36 --- 574 202 48 | 21 | 42 7 25 13 28 135 27 9 | 22 | 14 9 25 22 23 16 52 11 | X24E | 121 26 204 --- --- 292 697 259 | 25 | 21 24 44 10 113 208 392 87 | 26 | 17 18 32 10 18 33 22 8 | 27 | 92 8 132 30 49 117 35 22 | 29 | 27 8 19 17 28 35 10 7 | 30 | 13 5 28 10 22 231 17 6 | 31 | 64 16 37 17 7 56 4 11 | ------|----------------------------------| RMS | 55 20 92 51 104 146 98 | WRMS | 46 20 32 18 67 154 30 | MEDI | 26 12 37 18 26 120 27 |