Author: AC Coordinator / AIUB/CODE Rapid IGS Orbit Prediction Combination - Week 1050 Day: 0 (Feb 20, 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. 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 | 15 SIP | 19 ESP | 19 SIP | 27 SIP | 29 COP | 24 SIP | 8 USP | 1 ESP | 14 SIP | 11 SIP | ALL COP | 14 ESP | ALL (high Transformation - See Table 1) USP | 24 USP | ALL (high Transformation - See Table 1) 3. 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 -------+----- EMP | 14 EMP | 24 _______________________________________________________________________________ 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 1.1050.0 GPS week: 1050 Day: 0 MJD: 51594.0 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS --------|------------------------------------------------|--------------------- cop n/a|0.00 0.00-0.03 -0.01 0.22 -0.71 0.2 0.39 0.36 | 0.0 0.0 0.0 emp n/a|0.00 0.00 0.01 -0.33 -0.35 -0.63 -0.1 0.22 0.14 | 0.0 0.0 0.0 esp n/a|0.01 0.04 0.01 0.18 -0.13 11.33 0.8 0.49 0.36 | 0.0 0.0 0.0 gfp n/a|0.00 0.00-0.03 1.23 1.14 0.19 0.0 0.41 0.24 | 0.0 0.0 0.0 jpp n/a|0.00 0.01 0.01 -0.46 -0.50 1.90 0.0 0.37 0.23 | 0.0 0.0 0.0 sip n/a|0.01 0.00 0.01 -0.29 0.60 0.58 1.2 2.99 2.37 | 0.0 0.0 0.0 usp n/a|0.00 0.00 0.00 0.40 0.28 1.73 0.4 1.26 0.66 | 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 2.1050.0 GPS week: 1050 Day: 0 MJD: 51594.0 Weighted Average PRN | cop emp esp gfp jpp sip usp IGP | ------|----------------------------------| 1 | 96 8 42 48 30 153 489 27 | 2 | 7 15 37 8 27 144 51 10 | 3 | 28 17 63 14 39 157 38 14 | 4E | 63 15 151 141 107 144 193 49 | 5 | 12 7 16 9 11 206 12 5 | 6 | 29 4 34 7 10 54 11 8 | 7 | 5 17 50 13 23 157 12 9 | 8 | 22 4 15 22 7 474 31 8 | 9 | 13 6 27 15 16 26 5 7 | 10 | 25 11 28 10 14 99 19 8 | 11E | 66 10 44 13 48 388 114 21 | 13 | 39 25 28 15 28 199 24 16 | X15E | >>> 24 257 58 --- 139 --- 38 | X16 | 84 28 43 8 --- 201 --- 31 | 17 | 20 9 29 13 18 66 110 8 | X18 | 29 8 56 30 --- 289 --- 15 | X19 | 141 73 >>> 44 --- >>> --- 61 | 21 | 61 5 17 40 11 40 21 18 | 22 | 26 10 47 10 26 144 36 10 | 25 | 28 22 15 45 21 14 47 16 | 26 | 11 17 16 15 33 142 26 12 | 27 | 55 8 17 39 6 876 32 17 | 29 | 17 80 74 70 81 687 135 41 | 30 | 11 12 19 20 10 35 11 8 | 31 | 8 16 41 12 18 64 12 9 | ------|----------------------------------| RMS | 39 22 49 41 37 299 126 | WRMS | 36 14 36 24 23 237 66 | MEDI | 28 12 37 15 21 144 31 |