Author: AC Coordinator / AIUB/CODE Rapid IGS Orbit Prediction Combination - Week 1070 Day: 3 (Jul 12, 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 USP | 24 SIP | 24 ESP | 24 COP | 16 SIP | 3 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 | 15 COP | 24 EMP | 24 _______________________________________________________________________________ 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 1.1070.3 GPS week: 1070 Day: 3 MJD: 51737.0 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS --------|------------------------------------------------|--------------------- cop n/a|-.01 0.00 0.02 -0.18 0.55 -2.74 0.0 0.46 0.46 | 0.0 0.0 0.0 emp n/a|0.00 0.00-0.02 -0.29 0.99 1.31 0.0 0.30 0.27 | 0.0 0.0 0.0 esp n/a|0.02 0.01-0.08 -0.29 0.67 -7.63 0.1 0.61 0.19 | 0.0 0.0 0.0 gfp n/a|0.00 0.00 0.00 0.38 -0.44 0.60 -0.1 0.43 0.15 | 0.0 0.0 0.0 jpp n/a|0.01 0.00-0.01 0.04 -0.57 0.07 -0.1 0.22 0.22 | 0.0 0.0 0.0 sip n/a|-.03-0.01-0.04 -0.06 0.12 2.75 1.0 1.20 1.19 | 0.0 0.0 0.0 usp n/a|0.01 0.00 0.01 -0.08 -0.68 -1.42 0.4 0.93 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 2.1070.3 GPS week: 1070 Day: 3 MJD: 51737.0 Weighted Average PRN | cop emp esp gfp jpp sip usp IGP | ------|----------------------------------| X1E | 25 21 58 246 232 77 --- 90 | 2 | 30 22 12 13 48 60 12 15 | X3 | 41 18 38 36 39 352 --- 40 | 4 | 7 17 14 4 15 226 11 17 | 5 | 11 36 17 22 7 72 9 11 | 6 | 183 45 203 120 12 29 244 50 | 7 | 28 5 42 13 16 28 66 10 | 8 | 10 12 25 17 15 100 67 12 | 9 | 16 23 13 5 7 159 64 15 | 10 | 3 14 24 16 13 214 30 17 | 11 | 36 14 13 10 31 31 38 12 | 13E | 29 27 48 37 24 41 168 22 | X16 | 481 18 60 9 --- 243 67 159 | 17 | 9 7 14 4 8 84 16 7 | 19 | 19 45 15 16 12 153 80 18 | 20 | 9 26 23 4 11 124 22 11 | 21 | 35 22 --- 26 11 184 9 17 | 22 | 16 10 24 7 10 48 8 6 | 25 | 19 10 16 13 9 70 50 9 | X26E | 42 40 295 142 165 48 --- 60 | 27 | 8 6 21 11 11 96 43 9 | 29E | 42 69 150 120 45 175 54 36 | 30 | 12 29 17 15 6 114 9 11 | 31 | 13 49 50 59 49 50 236 32 | ------|----------------------------------| RMS | 46 30 61 43 22 120 93 | WRMS | 46 27 19 15 22 119 39 | MEDI | 19 22 24 16 13 90 43 |