Author: AC Coordinator / AIUB/CODE Rapid IGS Orbit Prediction Combination - Week 1055 Day: 2 (Mar 28, 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 ESP | 15 ESP | 14 SIP | 31 SIP | 11 ESP | 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 | 14 EMP | 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 1.1055.2 GPS week: 1055 Day: 2 MJD: 51631.0 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS --------|------------------------------------------------|--------------------- cop n/a|0.00 0.00 0.02 0.15 -0.49 -0.68 -0.1 0.55 0.21 | 0.0 0.0 0.0 emp n/a|0.00 0.00-0.01 0.38 -0.02 0.03 -0.1 0.35 0.35 | 0.0 0.0 0.0 esp n/a|0.00 0.01 0.02 -0.06 0.22 5.91 -0.4 0.90 0.36 | 0.0 0.0 0.0 gfp n/a|0.00 0.00-0.01 -0.08 -0.50 0.14 -0.9 0.81 0.39 | 0.0 0.0 0.0 jpp n/a|0.00 0.00 0.04 -0.97 3.19 -1.47 0.2 1.23 0.41 | 0.0 0.0 0.0 sip n/a|-.01-0.02 0.05 0.78 0.58 2.37 3.4 3.41 2.48 | 0.0 0.0 0.0 usp n/a|0.00-0.01-0.02 -0.45 -0.67 0.63 0.4 0.90 0.23 | 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 2.1055.2 GPS week: 1055 Day: 2 MJD: 51631.0 Weighted Average PRN | cop emp esp gfp jpp sip usp IGP | ------|----------------------------------| 1 | 16 8 27 28 14 374 19 31 | 2 | 13 19 24 17 11 85 5 9 | 3 | 14 5 31 33 21 262 6 22 | 4E | 56 28 47 100 138 38 30 29 | 5 | 10 9 18 11 35 108 27 12 | 6 | 25 7 19 6 24 52 29 10 | 7 | 39 24 103 110 134 173 15 31 | 8E | 12 15 119 128 290 171 53 47 | 9E | 44 31 28 160 352 175 164 64 | 10 | 7 5 12 38 9 39 10 7 | 11E | 17 77 154 128 165 959 15 96 | 13 | 10 11 15 16 31 68 23 9 | 16 | 23 8 16 23 5 191 11 17 | 17E | 43 28 192 173 18 126 21 32 | 18 | 13 10 31 26 20 166 22 15 | X19 | 29 21 169 96 --- 364 177 55 | 21 | 8 4 28 36 36 159 29 16 | 22 | 5 18 8 22 17 208 14 18 | 24E | 42 44 78 43 175 40 49 30 | 25 | 228 37 217 12 176 90 315 81 | 26 | 8 13 18 22 16 119 20 12 | 27 | 87 120 208 183 131 294 232 69 | 29 | 26 14 46 51 50 166 25 19 | 30 | 10 12 16 12 29 240 7 20 | 31 | 12 19 30 15 41 >>> 7 100 | ------|----------------------------------| RMS | 55 35 90 81 123 341 90 | WRMS | 21 35 36 39 41 248 23 | MEDI | 16 15 30 33 33 166 22 |