Author: AC Coordinator / AIUB/CODE Rapid IGS Orbit Prediction Combination - Week 1071 Day: 5 (Jul 21, 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 | ALL (high Transformation - See Table 1) ESP | 13 JPP | 29 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 1.1071.5 GPS week: 1071 Day: 5 MJD: 51746.0 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS --------|------------------------------------------------|--------------------- cop n/a|0.00 0.01 0.05 -0.35 0.10 3.86 -0.3 0.33 0.25 | 0.0 0.0 0.0 emp n/a|0.00 0.00 0.00 -0.05 -0.41 -4.72 -0.4 0.34 0.36 | 0.0 0.0 0.0 esp n/a|0.00 0.00-0.11 0.56 0.10 3.58 0.0 0.70 0.23 | 0.0 0.0 0.0 gfp n/a|0.00 0.00 0.01 0.15 -0.23 -3.10 0.2 0.44 0.17 | 0.0 0.0 0.0 jpp n/a|0.00-0.01 0.00 -0.10 0.36 -1.91 0.1 0.61 0.46 | 0.0 0.0 0.0 sip n/a|0.02 0.00 0.03 -0.02 0.35 5.47 0.3 1.20 1.40 | 0.0 0.0 0.0 usp n/a|0.00 0.00 0.07 -0.73 -0.57 2.74 1.1 0.54 0.51 | 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 2.1071.5 GPS week: 1071 Day: 5 MJD: 51746.0 Weighted Average PRN | cop emp esp gfp jpp sip usp IGP | ------|----------------------------------| 1E | 33 70 26 134 50 25 103 35 | 2 | 12 56 12 5 23 27 42 12 | 3 | 13 17 37 13 10 230 47 10 | 4 | 20 13 8 12 11 35 30 7 | 5 | 24 32 22 6 6 30 43 10 | 6 | 28 24 21 15 22 33 42 11 | 7 | 21 18 30 14 5 20 62 11 | 8 | 27 37 17 13 26 93 39 11 | 9 | 25 33 9 15 26 105 16 10 | 10 | 26 18 11 10 17 97 15 8 | 11 | 24 17 26 9 10 21 26 8 | 13E | 8 15 270 34 19 32 25 61 | X15 | 21 20 65 40 --- 59 85 23 | 16 | 7 14 34 19 15 30 26 9 | 17 | 17 13 12 13 6 169 42 7 | 19 | 20 14 43 10 13 91 90 14 | 20 | 7 46 10 25 13 276 75 13 | 21 | 14 13 9 35 15 173 28 9 | 22 | 20 24 22 7 18 63 59 10 | 24 | 114 70 29 37 42 124 141 33 | 25 | 20 33 17 14 22 37 22 9 | 26E | 25 54 155 52 98 267 27 38 | 27 | 27 33 12 13 23 161 15 10 | 29E | 66 26 122 143 269 75 26 89 | 30 | 20 31 13 9 6 43 43 9 | 31 | 9 17 30 10 10 24 32 8 | ------|----------------------------------| RMS | 33 34 70 44 61 120 53 | WRMS | 25 36 23 17 46 140 51 | MEDI | 21 24 22 14 17 61 41 |