Author: AC Coordinator / AIUB/CODE Rapid IGS Orbit Prediction Combination - Week 1053 Day: 4 (Mar 16, 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 -------+--------------- SIP | 18 USP | 14 USP | 8 SIP | 15 JPP | 8 ESP | 18 USP | 9 COP | 15 ESP | ALL (high Transformation - See Table 1) JPP | 9 SIP | 11 SIP | 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 -------+----- COP | 14 EMP | 14 EMP | 15 COP | 18 _______________________________________________________________________________ Table 1.1053.4 GPS week: 1053 Day: 4 MJD: 51619.0 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS --------|------------------------------------------------|--------------------- cop n/a|0.01 0.00-0.02 0.68 1.65 2.40 0.4 0.50 0.34 | 0.0 0.0 0.0 emp n/a|0.00 0.00 0.01 0.50 1.86 0.04 0.0 0.55 0.55 | 0.0 0.0 0.0 esp n/a|0.00-0.01 0.03 0.14 0.87 8.58 1.5 1.44 0.37 | 0.0 0.0 0.0 gfp n/a|-.01 0.00-0.02 -1.11 -2.85 -0.82 -0.1 0.59 0.22 | 0.0 0.0 0.0 jpp n/a|0.00 0.01 0.05 1.34 2.07 0.03 0.3 3.23 0.32 | 0.0 0.0 0.0 sip n/a|0.00-0.03-0.02 -0.01 1.53 7.26 2.4 1.42 1.01 | 0.0 0.0 0.0 usp n/a|0.00 0.00 0.00 -0.24 0.09 0.76 0.1 3.73 0.61 | 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 2.1053.4 GPS week: 1053 Day: 4 MJD: 51619.0 Weighted Average PRN | cop emp esp gfp jpp sip usp IGP | ------|----------------------------------| 1 | 42 22 18 28 23 97 6 13 | 2 | 34 6 45 11 12 138 34 10 | 3 | 38 59 43 42 11 29 38 22 | X4E | 48 69 135 --- --- 133 118 60 | 5 | 23 14 28 7 24 90 18 8 | 6 | 12 45 40 32 16 84 4 15 | 7 | 21 6 37 18 28 52 25 9 | 8E | 146 183 139 216 >>> 112 >>> 604 | 9E | 53 107 387 110 484 260 985 392 | 10 | 68 33 21 19 80 118 13 20 | 11E | 14 15 175 12 28 380 28 9 | 13 | 38 24 43 8 51 50 35 15 | X16 | 93 43 141 30 --- 243 174 54 | 17E | 56 36 355 31 17 76 24 17 | X19E | 136 66 396 --- 40 118 155 63 | 21 | 40 6 32 21 32 136 17 11 | 22 | 15 4 18 5 45 40 11 8 | X24E | 40 55 77 --- 69 95 106 42 | X25E | 58 34 171 --- 89 163 63 33 | 26 | 13 14 33 20 12 122 10 8 | 27E | 64 12 228 28 240 96 60 43 | 29 | 50 33 57 8 25 173 85 23 | 30 | 16 4 28 6 12 98 8 4 | 31 | 22 32 31 22 17 76 26 13 | ------|----------------------------------| RMS | 50 55 144 59 323 142 373 | WRMS | 35 55 37 22 32 102 61 | MEDI | 40 33 44 21 28 105 31 |