Author: AC Coordinator / AIUB/CODE Rapid IGS Orbit Prediction Combination - Week 1069 Day: 0 (Jul 02, 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 | 18 SIP | 24 USP | 24 ESP | 24 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 | 18 ESP | 18 COP | 24 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 1.1069.0 GPS week: 1069 Day: 0 MJD: 51727.0 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS --------|------------------------------------------------|--------------------- cop n/a|-.01 0.00 0.06 -0.16 0.46 0.10 -0.3 0.69 0.69 | 0.0 0.0 0.0 emp n/a|0.01 0.01-0.02 0.08 0.62 -1.37 -0.2 0.78 0.78 | 0.0 0.0 0.0 esp n/a|0.01 0.00-0.04 0.59 0.10 -1.46 0.0 0.89 0.79 | 0.0 0.0 0.0 gfp n/a|0.01 0.00 0.00 0.13 -0.65 0.93 -0.3 0.78 0.77 | 0.0 0.0 0.0 jpp n/a|0.01-0.01-0.02 0.05 0.02 0.29 0.3 0.79 0.35 | 0.0 0.0 0.0 sip n/a|-.03-0.01 0.02 0.40 0.03 0.35 0.4 1.13 0.99 | 0.0 0.0 0.0 usp n/a|-.03 0.00-0.06 -0.64 -0.64 0.00 -0.1 0.87 0.97 | 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 2.1069.0 GPS week: 1069 Day: 0 MJD: 51727.0 Weighted Average PRN | cop emp esp gfp jpp sip usp IGP | ------|----------------------------------| 1 | 76 122 21 43 36 126 98 32 | 2 | 12 6 16 26 10 19 46 9 | 3E | 14 8 55 49 13 15 22 12 | 4 | 16 11 11 6 8 42 31 7 | 5 | 11 6 11 11 9 32 42 8 | 6E | 44 24 48 98 28 48 13 20 | 7E | 27 15 205 93 11 90 19 34 | 8 | 41 38 21 10 11 21 98 17 | 9 | 32 21 12 34 13 74 61 14 | 10 | 8 14 40 14 12 239 55 26 | 11 | 226 262 267 249 293 142 307 107 | 13 | 17 16 20 12 20 220 12 23 | 15 | 75 37 57 26 31 130 94 26 | X16 | 384 147 127 125 --- 147 53 96 | 17 | 136 94 94 124 96 36 91 43 | 19 | 9 7 22 16 5 37 26 7 | X20 | 10 16 50 22 --- 107 69 21 | 21 | 6 22 25 23 10 43 25 9 | 22 | 56 122 52 101 88 90 32 34 | 25 | 16 21 24 17 11 82 10 11 | 26 | 48 77 17 32 16 225 24 28 | 27 | 29 14 13 9 8 99 7 12 | 29 | 121 140 166 129 167 168 155 60 | 30 | 20 15 16 13 7 39 30 8 | 31E | 22 28 119 98 97 65 60 31 | ------|----------------------------------| RMS | 69 78 89 78 79 113 87 | WRMS | 69 78 79 77 35 99 97 | MEDI | 27 21 25 26 13 82 42 |