Author: AC Coordinator / AIUB/CODE Rapid IGS Orbit Prediction Combination - Week 1095 Day: 5 (Jan 05, 2001) Contacts: R. Weber (rweber@terra.tuwien.ac.at), 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 ----+------------+----------- 09 | 2001_01_05 | 2000211 (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 | 17 SIP | 21 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 | 15 _______________________________________________________________________________ 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 1.1095.5 GPS week: 1095 Day: 5 MJD: 51914.0 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS --------|------------------------------------------------|--------------------- cop n/a|0.00 0.00-0.06 0.06 -0.16 -0.36 -0.5 0.19 0.20 | 0.0 0.0 0.00 emp n/a|0.00 0.00 0.03 -0.12 0.61 0.07 0.3 0.32 0.17 | 0.0 0.0 0.00 esp n/a|-.01 0.01 0.11 -0.67 -0.59 0.64 -0.2 0.44 0.19 | 0.0 0.0 0.00 gfp n/a|-.01 0.01 0.01 1.48 0.25 -0.46 -0.1 0.61 0.28 | 0.0 0.0 0.00 sip n/a|-.02 0.02 0.02 -1.27 0.60 3.80 1.7 1.28 1.27 | 0.0 0.0 0.00 usp n/a|0.00-0.01-0.06 0.20 -1.03 -2.87 -0.4 1.18 0.91 | 0.0 0.0 0.00 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 2.1095.5 GPS week: 1095 Day: 5 MJD: 51914.0 Weighted Average PRN | cop emp esp gfp sip usp IGP | ------|------------------------------| X1E | 76 16 86 105 97 --- 37 | 2 | 11 13 12 12 26 12 6 | 3 | 6 7 13 13 152 265 27 | 4 | 7 9 11 22 62 16 8 | X5 | 8 12 16 23 --- 12 7 | 6 | 14 30 40 34 57 294 28 | 7 | 9 9 13 24 35 162 15 | 8 | 15 12 27 25 20 46 9 | 10 | 15 17 16 22 66 11 10 | 11 | 6 20 15 21 58 30 9 | 13E | 16 17 84 137 86 75 29 | 14E | 26 28 124 156 238 54 43 | X17 | 100 39 90 214 665 --- 107 | 19 | 35 116 10 137 127 156 38 | 20 | 5 5 17 22 38 23 7 | 21 | 10 7 17 13 430 24 48 | 22 | 17 39 14 13 62 36 12 | 24 | 56 20 43 74 99 99 25 | 25 | 10 7 11 7 26 15 5 | 26E | 14 12 42 37 25 178 19 | 27 | 14 7 13 14 20 12 6 | X28 | 16 28 21 23 --- 39 11 | 29E | 21 47 98 42 42 147 27 | 30 | 17 11 12 5 140 14 15 | 31 | 7 28 14 40 61 92 13 | ------|------------------------------| RMS | 19 32 44 61 128 118 | WRMS | 20 17 19 28 127 91 | MEDI | 14 16 16 23 62 39 |