Author: AC Coordinator / AIUB/CODE Rapid IGS Orbit Prediction Combination - Week 1081 Day: 4 (Sep 28, 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. Because of a maneuver, some satellites were excluded from the Prediction combination. The following table lists the maneuvered satellites: PRN | Date | Ref. NANU ----+------------+----------- 25 | 2000_09_28 | 2000146 (Predicted) 25 | 2000_09_27 | 2000145 (Predicted) 11 | 2000_09_26 | 2000143 (Predicted) 3. 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 -------+--------------- JPP | 8 _______________________________________________________________________________ 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 1.1081.4 GPS week: 1081 Day: 4 MJD: 51815.0 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS --------|------------------------------------------------|--------------------- cop n/a|0.01-0.01 0.03 0.18 -0.56 -0.69 -0.3 0.21 0.21 | 0.0 0.0 0.0 emp n/a|0.00 0.00 0.01 -0.52 0.70 0.42 0.0 0.11 0.11 | 0.0 0.0 0.0 esp n/a|0.00 0.00-0.02 0.60 -0.49 1.39 0.4 0.48 0.18 | 0.0 0.0 0.0 gfp n/a|0.00 0.00 0.00 0.42 -0.41 0.04 0.3 0.57 0.33 | 0.0 0.0 0.0 jpp n/a|0.00 0.00-0.02 0.63 -0.75 1.83 0.4 1.58 1.40 | 0.0 0.0 0.0 sip n/a|0.00 0.02 0.04 0.71 -0.26 -1.28 0.0 0.71 0.45 | 0.0 0.0 0.0 usp n/a|0.01 0.00 0.00 0.40 -0.20 0.01 0.3 0.94 0.75 | 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 2.1081.4 GPS week: 1081 Day: 4 MJD: 51815.0 Weighted Average PRN | cop emp esp gfp jpp sip usp IGP | ------|----------------------------------| 1 | 15 8 14 19 10 16 25 5 | 2 | 11 8 13 12 27 78 20 8 | 3 | 7 6 21 21 30 32 51 7 | 4E | 11 7 46 126 253 121 133 33 | 5 | 6 3 8 7 20 23 18 4 | 6 | 9 7 6 6 25 44 9 5 | 7 | 12 4 13 6 13 27 51 6 | 8 | 20 25 43 82 635 125 170 71 | 9 | 22 20 60 109 34 24 238 28 | 10 | 41 16 10 33 31 25 13 11 | 13 | 11 10 13 9 11 46 6 6 | X15E | 40 --- --- 20 66 79 58 24 | 17E | 13 6 169 73 67 145 7 28 | X19 | 14 18 12 16 39 52 --- 9 | 20 | 24 11 20 25 33 46 35 9 | 21 | 44 18 15 5 23 44 22 11 | 22 | 16 9 40 22 24 15 12 8 | 24E | 35 10 91 156 256 77 34 35 | 26 | 22 4 24 24 23 25 21 7 | 27 | 31 8 27 28 26 79 281 27 | 28 | 13 5 17 18 19 45 35 7 | 29 | 9 4 20 17 20 80 18 8 | 30 | 7 10 8 12 13 126 43 12 | 31 | 5 15 13 30 38 74 19 10 | ------|----------------------------------| RMS | 21 11 48 57 158 71 94 | WRMS | 21 11 18 32 139 45 75 | MEDI | 14 8 17 21 27 46 25 |