Author: AC Coordinator / AIUB/CODE Rapid IGS Orbit Prediction Combination - Week 1061 Day: 4 (May 11, 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 ----+------------+----------- 22 | 2000_05_11 | 2000061 (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 -------+--------------- SIP | 6 SIP | ALL (high Transformation - See Table 1) JPP | 2 _______________________________________________________________________________ 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 1.1061.4 GPS week: 1061 Day: 4 MJD: 51675.0 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS --------|------------------------------------------------|--------------------- cop n/a|0.00 0.01-0.01 0.47 -0.15 2.42 -0.1 0.27 0.27 | 0.0 0.0 0.0 emp n/a|0.00 0.00 0.00 0.44 -0.12 -0.91 0.1 0.26 0.26 | 0.0 0.0 0.0 esp n/a|0.00 0.00-0.02 0.12 0.35 -0.62 0.2 0.26 0.11 | 0.0 0.0 0.0 gfp n/a|0.00 0.01 0.02 1.12 0.59 0.61 -0.2 0.60 0.44 | 0.0 0.0 0.0 jpp n/a|0.00 0.00-0.01 -2.24 -0.96 0.00 0.1 0.74 0.43 | 0.0 0.0 0.0 sip n/a|0.02 0.02-0.07 -0.40 0.16 -6.52 -1.4 1.30 0.87 | 0.0 0.0 0.0 usp n/a|0.00 0.00 0.05 0.56 0.76 0.58 0.3 0.56 0.31 | 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 2.1061.4 GPS week: 1061 Day: 4 MJD: 51675.0 Weighted Average PRN | cop emp esp gfp jpp sip usp IGP | ------|----------------------------------| 1 | 10 21 6 24 8 41 18 6 | 2E | 22 70 75 156 305 176 22 75 | 3 | 8 10 9 7 6 82 6 4 | 4 | 31 8 17 12 8 37 7 8 | 5E | 31 10 31 100 46 68 22 18 | 6 | 6 23 4 9 9 376 38 7 | 7 | 13 7 5 19 4 196 30 6 | 8 | 25 7 11 26 17 34 35 8 | 9 | 24 17 14 24 6 42 15 8 | 10E | 66 12 38 124 55 38 53 25 | 11 | 22 8 8 21 7 106 32 7 | 13 | 8 5 12 13 18 167 16 5 | 15 | 4 17 11 11 13 23 9 5 | 16 | 12 16 9 14 19 125 14 6 | 17 | 11 4 8 17 9 51 8 4 | 18 | 60 68 17 26 29 49 180 30 | 19 | 15 26 15 25 20 70 23 9 | 21E | 57 8 17 140 179 139 53 39 | 24 | 16 10 14 17 8 91 6 6 | 25 | 22 4 17 11 7 192 13 6 | 26 | 11 8 8 28 10 92 9 5 | 27 | 25 5 10 27 13 176 11 7 | 29 | 16 17 7 12 10 143 15 6 | 30E | 30 13 77 108 66 73 165 34 | 31 | 10 59 10 25 23 31 69 16 | ------|----------------------------------| RMS | 27 26 26 60 74 130 56 | WRMS | 27 26 11 44 43 87 31 | MEDI | 16 10 11 24 13 82 18 |