Author: AC Coordinator / AIUB/CODE Rapid IGS Orbit Prediction Combination - Week 1054 Day: 5 (Mar 24, 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 COP | 14 SIP | 31 COP | 24 SIP | 21 SIP | 30 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 -------+----- ESP | 14 USP | 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 1.1054.5 GPS week: 1054 Day: 5 MJD: 51627.0 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS --------|------------------------------------------------|--------------------- cop n/a|0.00 0.00-0.03 -0.37 -0.43 0.35 -0.2 0.37 0.30 | 0.0 0.0 0.0 emp n/a|0.00 0.01 0.01 -0.39 -0.80 3.12 0.6 0.41 0.36 | 0.0 0.0 0.0 esp n/a|0.00 0.00-0.02 -0.38 -0.03 -0.11 -0.2 1.08 0.28 | 0.0 0.0 0.0 gfp n/a|0.00 0.00 0.00 0.17 0.48 -1.99 -1.3 0.42 0.20 | 0.0 0.0 0.0 jpp n/a|-.01-0.01 0.03 3.11 1.64 -0.77 0.8 1.05 0.35 | 0.0 0.0 0.0 sip n/a|0.02 0.03 0.01 -0.07 0.44 -1.46 1.1 3.58 2.23 | 0.0 0.0 0.0 usp n/a|0.00 0.00-0.03 -0.19 0.00 -0.60 0.1 0.39 0.28 | 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 2.1054.5 GPS week: 1054 Day: 5 MJD: 51627.0 Weighted Average PRN | cop emp esp gfp jpp sip usp IGP | ------|----------------------------------| 1 | 32 32 27 19 16 46 42 13 | 2 | 23 28 19 21 22 87 14 10 | 3 | 19 63 32 12 38 377 15 25 | 4E | 94 41 107 62 273 146 42 40 | 5 | 24 11 24 14 22 253 17 16 | 6 | 31 26 31 15 10 280 23 18 | 7 | 9 25 29 17 40 299 35 19 | 8E | 23 29 242 99 227 228 11 41 | 9E | 23 24 161 34 18 162 32 21 | 10 | 20 16 12 21 20 61 20 8 | 11E | 15 59 203 43 27 277 51 30 | 13 | 10 21 27 15 23 209 26 14 | 16 | 13 11 19 16 24 119 14 9 | 17E | 96 22 88 60 208 322 110 42 | 18 | 40 39 33 14 25 41 89 21 | 19E | 74 113 200 67 72 230 25 38 | 21 | 20 13 34 13 15 557 28 35 | 22 | 16 56 14 16 70 76 9 14 | X24E | 953 38 70 27 --- 134 19 284 | 25E | 12 46 44 59 266 81 9 32 | 26 | 6 20 22 16 14 30 25 7 | 27E | 9 19 285 85 54 143 24 34 | 29 | 26 31 28 26 16 34 38 12 | 30 | 10 23 18 14 47 557 7 34 | 31 | 19 50 44 38 20 >>> 24 78 | ------|----------------------------------| RMS | 37 41 108 42 105 358 39 | WRMS | 30 36 28 20 35 223 28 | MEDI | 20 28 32 21 25 162 24 |