Author: AC Coordinator / AIUB/CODE Rapid IGS Orbit Prediction Combination - Week 1069 Day: 6 (Jul 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 | 24 COP | 16 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 | 18 _______________________________________________________________________________ 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 1.1069.6 GPS week: 1069 Day: 6 MJD: 51733.0 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS --------|------------------------------------------------|--------------------- cop n/a|-.01 0.01 0.03 -0.23 -0.04 -2.28 -0.2 0.24 0.22 | 0.0 0.0 0.0 emp n/a|0.00 0.00-0.01 -0.47 0.39 1.54 0.4 0.21 0.21 | 0.0 0.0 0.0 esp n/a|-.01 0.00-0.14 0.29 -0.04 -2.90 0.3 0.51 0.26 | 0.0 0.0 0.0 gfp n/a|0.00 0.01 0.01 0.57 -0.21 2.03 -0.4 0.38 0.22 | 0.0 0.0 0.0 jpp n/a|-.01 0.00 0.00 1.90 -2.88 -0.23 0.2 1.24 0.54 | 0.0 0.0 0.0 sip n/a|0.00 0.00 0.06 0.33 -0.37 -2.26 0.6 1.04 1.16 | 0.0 0.0 0.0 usp n/a|-.01 0.00 0.02 0.33 0.30 2.85 0.4 0.79 0.57 | 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 2.1069.6 GPS week: 1069 Day: 6 MJD: 51733.0 Weighted Average PRN | cop emp esp gfp jpp sip usp IGP | ------|----------------------------------| 1 | 19 14 20 13 55 53 37 9 | 2 | 14 12 38 32 76 159 27 16 | 3E | 50 23 99 28 330 128 29 34 | 4 | 30 19 15 16 46 225 36 19 | 5 | 14 7 22 32 28 117 47 12 | 6E | 18 18 46 21 90 32 105 16 | 7E | 17 10 60 98 327 27 44 33 | 8 | 25 10 19 11 21 83 71 12 | 9 | 26 9 16 13 24 23 44 8 | 10 | 9 6 16 12 17 71 77 10 | 11 | 30 7 45 7 31 21 66 12 | 13E | 20 25 19 21 41 64 54 12 | 15 | 37 22 35 33 21 66 133 19 | X16 | 509 17 44 44 --- 29 61 149 | 17 | 10 15 18 27 16 49 20 8 | 19 | 44 50 22 25 30 148 266 34 | 20 | 13 10 15 14 15 61 31 7 | 21 | 14 25 37 9 55 150 65 16 | 22 | 11 7 13 16 23 153 40 13 | X24 | 95 40 107 --- --- >>> >>> 484 | 25 | 25 9 33 23 40 16 54 10 | 26E | 9 9 13 12 27 106 41 10 | 27 | 19 7 20 10 21 90 41 10 | X29E | 36 46 87 20 96 102 --- 24 | 30 | 19 8 36 45 39 158 27 16 | 31E | 14 58 175 116 320 13 31 42 | ------|----------------------------------| RMS | 24 21 51 38 124 104 79 | WRMS | 22 21 26 22 54 116 57 | MEDI | 19 13 28 21 35 77 44 |