Author: AC Coordinator / AIUB/CODE Rapid IGS Orbit Prediction Combination - Week 1074 Day: 2 (Aug 08, 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 -------+--------------- USP | 24 SIP | 19 SIP | 24 COP | 19 SIP | 16 COP | 15 SIP | 21 COP | 16 SIP | 11 SIP | ALL (high Transformation - See Table 1) EMP | 19 JPP | 29 EMP | 24 JPP | ALL (high Transformation - See Table 1) COP | 24 USP | 19 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 | 15 ESP | 16 USP | 16 ESP | 19 ESP | 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 1.1074.2 GPS week: 1074 Day: 2 MJD: 51764.0 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS --------|------------------------------------------------|--------------------- cop n/a|0.00 0.00 0.07 0.06 0.23 -0.33 0.4 0.41 0.42 | 0.0 0.0 0.0 emp n/a|0.00 0.00 0.04 -0.08 0.23 0.71 0.2 0.40 0.20 | 0.0 0.0 0.0 esp n/a|0.01-0.01-0.09 0.25 -0.19 -1.40 -0.2 0.17 0.16 | 0.0 0.0 0.0 gfp n/a|0.00 0.01 0.04 -0.37 -0.01 1.41 -0.2 0.42 0.25 | 0.0 0.0 0.0 jpp n/a|0.00 0.01 0.02 3.37 -0.37 0.10 1.4 1.25 0.89 | 0.0 0.0 0.0 sip n/a|0.03 0.06 0.01 0.29 -0.65-12.82 -3.1 4.32 3.09 | 0.0 0.0 0.0 usp n/a|-.01 0.00 0.08 -0.28 0.01 1.17 0.3 0.51 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 2.1074.2 GPS week: 1074 Day: 2 MJD: 51764.0 Weighted Average PRN | cop emp esp gfp jpp sip usp IGP | ------|----------------------------------| 1E | 42 42 18 54 37 71 81 22 | 2 | 15 17 10 19 10 272 44 10 | 3 | 33 49 16 30 26 338 26 15 | 4 | 67 10 23 17 34 54 21 16 | 5 | 10 19 7 9 15 311 12 6 | 6 | 28 18 7 26 24 89 39 11 | 7 | 22 18 22 23 40 247 11 10 | 8 | 32 19 17 37 24 179 30 13 | 9 | 16 10 6 10 35 324 15 5 | 10 | 74 8 20 10 13 79 5 16 | 11E | 54 28 32 64 117 967 65 23 | 13 | 23 103 17 96 197 532 20 29 | 17 | 34 94 29 16 53 146 50 24 | 20 | 43 13 18 15 11 128 8 11 | 21 | 52 16 24 38 19 >>> 16 15 | 22 | 14 14 7 19 18 160 18 7 | 25 | 22 36 9 47 27 309 49 15 | 26 | 27 57 11 79 104 107 34 21 | 27 | 24 6 8 25 24 277 10 7 | 29 | 84 33 9 77 518 484 178 40 | 30 | 16 22 8 7 12 385 11 7 | 31 | 47 42 10 17 26 553 27 14 | ------|----------------------------------| RMS | 41 40 17 42 125 432 51 | WRMS | 42 20 16 25 89 309 28 | MEDI | 30 19 14 24 26 275 24 |