Author: AC Coordinator / AIUB/CODE Rapid IGS Orbit Prediction Combination - Week 1057 Day: 2 (Apr 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 ----+------------+----------- 19 | 2000_04_09 | 2000049 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 -------+--------------- COP | 14 SIP | 15 SIP | 11 USP | 11 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 -------+----- ESP | 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 1.1057.2 GPS week: 1057 Day: 2 MJD: 51645.0 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS --------|------------------------------------------------|--------------------- cop n/a|0.00 0.00-0.01 -0.34 0.17 0.51 -0.1 0.33 0.36 | 0.0 0.0 0.0 emp n/a|0.00 0.00-0.01 0.10 0.32 0.16 -0.3 0.29 0.29 | 0.0 0.0 0.0 esp n/a|0.01 0.00-0.04 -0.34 0.51 -1.09 0.5 0.31 0.27 | 0.0 0.0 0.0 gfp n/a|0.00 0.00 0.05 -1.01 0.58 0.46 0.0 0.58 0.22 | 0.0 0.0 0.0 jpp n/a|0.00 0.00-0.01 1.96 -1.89 0.10 -0.2 0.38 0.56 | 0.0 0.0 0.0 sip n/a|0.00 0.01-0.07 -0.34 1.07 1.42 1.2 2.06 1.57 | 0.0 0.0 0.0 usp n/a|0.00 0.01 0.01 -1.23 0.30 1.51 0.4 1.27 0.62 | 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 2.1057.2 GPS week: 1057 Day: 2 MJD: 51645.0 Weighted Average PRN | cop emp esp gfp jpp sip usp IGP | ------|----------------------------------| 1 | 8 11 31 12 13 134 30 11 | 2 | 10 30 21 10 28 119 25 12 | 3 | 29 6 18 10 36 23 11 9 | X4 | 37 18 50 15 60 36 --- 18 | 5 | 20 13 4 23 21 256 55 17 | 6 | 38 5 10 11 17 52 39 9 | 7 | 26 49 8 22 49 69 44 15 | 8 | 26 6 7 10 21 33 13 6 | 9 | 22 6 20 11 36 434 70 30 | 10 | 51 6 9 29 36 42 9 12 | 11 | 12 27 32 18 15 568 515 87 | 13 | 47 12 26 40 22 57 111 17 | X15 | 31 59 41 227 260 717 --- 89 | 16 | 9 8 43 14 23 184 61 15 | 17E | 56 33 81 251 46 35 180 47 | 18 | 47 89 55 52 41 50 109 28 | 21 | 18 11 44 13 23 94 29 11 | 22 | 18 16 36 13 23 221 61 17 | X24 | 47 42 --- 77 94 260 212 44 | 25 | 19 16 28 13 20 270 11 17 | 26 | 12 13 27 9 20 269 12 17 | 27 | 23 6 7 21 10 75 28 8 | 29 | 21 3 16 7 44 101 14 10 | 30 | 39 38 7 12 102 59 18 20 | 31 | 73 55 28 45 67 236 107 28 | ------|----------------------------------| RMS | 33 29 31 58 38 207 127 | WRMS | 36 29 27 22 56 157 62 | MEDI | 26 13 27 14 28 101 39 |