Author: AC Coordinator / AIUB/CODE Rapid IGS Orbit Prediction Combination - Week 1074 Day: 5 (Aug 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 ----+------------+----------- 02 | 2000_08_09 | 2000129 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 | 15 COP | 15 SIP | 21 ESP | 24 SIP | ALL (high Transformation - See Table 1) 4. 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 COP | 28 JPP | 28 _______________________________________________________________________________ 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 1.1074.5 GPS week: 1074 Day: 5 MJD: 51767.0 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS --------|------------------------------------------------|--------------------- cop n/a|0.01 0.00 0.03 -0.61 0.37 -2.23 -0.5 0.22 0.23 | 0.0 0.0 0.0 emp n/a|-.01 0.00-0.01 0.33 -0.49 0.25 -0.2 0.29 0.25 | 0.0 0.0 0.0 esp n/a|-.01 0.01 0.01 0.07 0.09 0.54 0.3 0.17 0.11 | 0.0 0.0 0.0 gfp n/a|0.00 0.00 0.01 0.12 0.31 0.18 -0.4 0.58 0.18 | 0.0 0.0 0.0 jpp n/a|0.01 0.01-0.01 0.51 -0.67 2.06 0.1 0.52 1.74 | 0.0 0.0 0.0 sip n/a|-.04 0.02 0.05 -0.43 -0.17 -5.81 -2.7 5.84 3.13 | 0.0 0.0 0.0 usp n/a|0.01 0.01 0.00 -0.21 -0.45 1.20 0.5 0.98 0.82 | 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 2.1074.5 GPS week: 1074 Day: 5 MJD: 51767.0 Weighted Average PRN | cop emp esp gfp jpp sip usp IGP | ------|----------------------------------| 1 | 28 57 53 152 214 406 141 44 | 3 | 12 21 13 31 33 431 15 9 | X4E | 44 71 12 34 171 389 --- 35 | 5 | 10 28 11 8 17 730 35 7 | X6 | 16 --- 10 21 10 274 10 7 | 7 | 12 7 6 17 22 696 40 6 | 8 | 19 7 10 14 13 81 44 7 | 9 | 22 24 13 26 8 134 7 8 | 10 | 9 13 9 18 35 215 10 7 | 11E | 52 50 16 186 25 831 27 29 | 13 | 43 8 13 11 22 712 159 16 | X16 | 36 --- 8 37 27 124 24 13 | 17 | 16 59 8 11 8 112 178 17 | 19 | 20 16 20 15 11 452 173 16 | 20 | 36 20 14 12 21 318 68 11 | 21 | 8 25 10 11 15 >>> 18 6 | 22 | 12 16 8 13 30 385 7 6 | X24E | 138 108 >>> 118 --- 61 171 740 | 25 | 8 10 10 16 20 155 33 6 | 26 | 13 44 28 67 33 165 188 21 | 27 | 19 8 10 12 14 65 16 6 | 29 | 9 28 10 26 11 767 194 17 | 30 | 9 27 5 7 9 318 24 6 | 31 | 18 21 6 14 9 866 8 6 | ------|----------------------------------| RMS | 22 29 17 58 52 584 98 | WRMS | 23 25 11 18 174 313 82 | MEDI | 17 23 10 17 20 352 33 |