Author: AC Coordinator / AIUB/CODE Rapid IGS Orbit Prediction Combination - Week 1057 Day: 1 (Apr 10, 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 ----+------------+----------- 19 | 2000_04_08 | 2000044 (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 -------+--------------- ESP | 14 SIP | 9 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 -------+----- COP | 14 _______________________________________________________________________________ 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 1.1057.1 GPS week: 1057 Day: 1 MJD: 51644.0 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS --------|------------------------------------------------|--------------------- cop n/a|0.00-0.01-0.01 -0.29 -0.04 1.73 0.2 0.28 0.24 | 0.0 0.0 0.0 emp n/a|0.01 0.01 0.06 -0.07 -0.20 1.83 0.3 0.46 0.46 | 0.0 0.0 0.0 esp n/a|0.00 0.01-0.05 -0.66 0.31 -1.86 0.0 0.66 0.30 | 0.0 0.0 0.0 gfp n/a|0.00 0.00-0.01 -1.29 0.29 -0.80 0.1 0.36 0.35 | 0.0 0.0 0.0 jpp n/a|0.00 0.01 0.03 3.98 -0.37 -2.31 -0.6 0.47 0.29 | 0.0 0.0 0.0 sip n/a|-.02-0.02-0.01 -1.91 0.30 2.19 -0.7 2.02 1.48 | 0.0 0.0 0.0 usp n/a|0.01 0.00 0.01 -1.23 0.37 -1.75 0.1 1.17 0.68 | 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 2.1057.1 GPS week: 1057 Day: 1 MJD: 51644.0 Weighted Average PRN | cop emp esp gfp jpp sip usp IGP | ------|----------------------------------| 1 | 16 11 14 10 15 169 22 11 | 2 | 37 21 16 7 33 139 130 19 | 3 | 46 46 30 6 27 53 32 15 | 4 | 23 61 53 45 76 144 191 29 | 5 | 16 30 27 18 13 305 31 19 | 6 | 18 12 12 7 13 31 45 7 | 7 | 18 45 7 7 19 83 19 11 | 8 | 4 16 10 12 29 140 20 10 | 9 | 9 5 9 7 28 532 8 33 | 10 | 11 15 14 7 30 39 39 8 | 11 | 34 20 63 69 122 225 380 48 | X13 | 14 24 83 36 --- 27 86 19 | X15 | 41 181 211 146 142 228 --- 64 | 16 | 67 21 44 8 56 275 40 24 | 17E | 40 21 177 34 20 202 146 32 | 18 | 41 176 62 130 101 303 29 47 | 21 | 7 23 16 7 26 83 46 9 | 22 | 16 35 31 9 50 311 114 24 | 24 | 18 37 221 49 46 67 240 41 | 25 | 33 14 34 20 45 128 22 14 | 26 | 13 30 22 9 24 85 25 9 | 27 | 22 21 8 16 35 133 16 11 | 29 | 13 16 13 8 34 132 16 10 | 30 | 38 7 33 22 25 32 94 15 | 31 | 15 27 27 7 18 182 43 13 | ------|----------------------------------| RMS | 28 46 66 36 47 202 117 | WRMS | 24 46 30 35 29 147 68 | MEDI | 18 21 27 10 30 139 40 |