Author: AC Coordinator / AIUB/CODE Rapid IGS Orbit Prediction Combination - Week 1050 Day: 3 (Feb 23, 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 | 15 SIP | 27 COP | 15 USP | 19 COP | 19 SIP | 17 USP | 1 ESP | 19 SIP | 19 COP | 14 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 ESP | 14 EMP | 15 EMP | 19 GFP | 19 _______________________________________________________________________________ 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 1.1050.3 GPS week: 1050 Day: 3 MJD: 51597.0 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS --------|------------------------------------------------|--------------------- cop n/a|0.00 0.00-0.01 0.15 0.76 -1.50 -0.3 0.66 0.51 | 0.0 0.0 0.0 emp n/a|0.00 0.00 0.05 0.34 0.63 0.27 0.0 0.53 0.53 | 0.0 0.0 0.0 esp n/a|0.00 0.00-0.04 -0.21 0.13 -0.28 -0.1 0.38 0.22 | 0.0 0.0 0.0 gfp n/a|0.00 0.00 0.00 0.15 -0.89 0.53 -0.3 0.30 0.24 | 0.0 0.0 0.0 jpp n/a|-.01 0.00 0.06 -0.55 1.46 -0.26 -1.1 0.86 0.58 | 0.0 0.0 0.0 sip n/a|0.00-0.01 0.05 -0.26 0.71 -2.35 0.7 2.25 0.94 | 0.0 0.0 0.0 usp n/a|0.00 0.00-0.02 -0.38 -0.75 0.79 0.5 1.26 0.50 | 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 2.1050.3 GPS week: 1050 Day: 3 MJD: 51597.0 Weighted Average PRN | cop emp esp gfp jpp sip usp IGP | ------|----------------------------------| 1 | 86 45 29 16 31 91 476 19 | 2 | 7 10 19 9 13 175 13 12 | 3 | 17 17 14 9 16 31 24 6 | 4E | 152 61 119 41 250 40 284 57 | 5 | 8 7 9 5 43 94 15 8 | 6 | 57 4 13 25 20 69 24 11 | 7 | 66 36 27 20 19 354 15 25 | 8 | 18 11 14 13 32 51 34 8 | 9 | 19 54 18 8 49 141 51 16 | 10 | 18 24 15 11 20 64 11 8 | 11E | 140 48 61 46 92 209 43 31 | 13 | 26 13 28 6 27 43 15 8 | X16 | 341 20 106 37 --- 44 --- 67 | 17E | 47 25 17 25 32 478 41 13 | X18 | 28 36 33 12 21 63 --- 12 | 21 | 11 45 28 6 11 191 23 15 | 22 | 16 7 14 8 13 134 18 10 | 24E | 103 23 65 73 230 54 139 41 | 25 | 29 59 6 34 35 112 52 16 | 26 | 14 34 19 11 14 337 23 22 | 27 | 55 41 7 14 18 645 68 15 | 29 | 138 195 53 82 158 21 62 46 | 30 | 11 10 4 14 19 158 14 11 | 31 | 23 10 21 13 21 46 17 7 | ------|----------------------------------| RMS | 66 53 38 30 86 224 126 | WRMS | 51 53 22 24 58 94 50 | MEDI | 27 25 19 14 21 93 24 |