Author: AC Coordinator / AIUB/CODE Rapid IGS Orbit Prediction Combination - Week 1052 Day: 4 (Mar 09, 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 -------+--------------- ESP | 15 COP | 18 ESP | 8 COP | 15 COP | 1 ESP | 14 SIP | 15 USP | 14 SIP | 14 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 _______________________________________________________________________________ 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 1.1052.4 GPS week: 1052 Day: 4 MJD: 51612.0 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS --------|------------------------------------------------|--------------------- cop n/a|0.01 0.01-0.01 -0.12 -0.44 4.01 0.5 3.41 0.46 | 0.0 0.0 0.0 emp n/a|0.00 0.00 0.02 -0.06 -0.11 2.10 0.3 1.00 0.35 | 0.0 0.0 0.0 esp n/a|0.01 0.01-0.03 -0.01 -0.12 -0.84 -0.9 1.44 0.68 | 0.0 0.0 0.0 gfp n/a|0.00 0.00-0.01 0.35 -0.04 -0.67 0.0 1.03 0.80 | 0.0 0.0 0.0 jpp n/a|0.00-0.02 0.02 0.81 0.71 -4.62 -0.6 1.93 0.67 | 0.0 0.0 0.0 sip n/a|0.01-0.03 0.07 -0.09 -0.24 -4.82 -1.4 1.71 1.59 | 0.0 0.0 0.0 usp n/a|0.00 0.01-0.01 -0.35 0.08 -1.85 -0.4 0.79 0.41 | 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 2.1052.4 GPS week: 1052 Day: 4 MJD: 51612.0 Weighted Average PRN | cop emp esp gfp jpp sip usp IGP | ------|----------------------------------| 1 | >>> 304 126 162 148 200 90 173 | 2 | 20 14 21 10 64 134 24 18 | 3 | 31 16 10 9 26 146 12 17 | 4E | 43 26 246 189 56 91 9 45 | 5 | 234 33 65 64 49 274 16 41 | 6 | 25 15 26 22 35 90 13 13 | 7 | 48 17 45 31 21 94 37 16 | X8E | --- 182 >>> --- 259 234 212 431 | 9E | 33 21 323 124 219 182 38 55 | 10 | 30 17 39 5 41 53 23 11 | 11E | 116 39 79 18 61 23 20 19 | 13 | 193 130 93 124 82 33 53 44 | X16 | 55 30 282 19 --- 104 130 53 | 17E | 29 68 150 37 32 16 12 25 | X18 | >>> --- 32 39 66 123 38 401 | 19E | 460 266 421 96 495 38 47 107 | 21 | 46 37 58 37 26 341 11 39 | 22 | 471 142 119 167 176 126 98 71 | 24E | 141 32 119 252 140 122 85 53 | 25E | 256 20 66 138 487 59 14 64 | 26 | 37 30 58 25 18 238 30 29 | 27E | 83 69 53 28 429 319 309 90 | 29 | 35 9 27 11 17 220 50 27 | 30 | 426 13 90 98 28 237 58 55 | 31 | 33 23 24 29 42 93 23 15 | ------|----------------------------------| RMS | 341 100 144 103 193 171 79 | WRMS | 46 35 68 80 67 159 41 | MEDI | 52 30 66 37 59 123 37 |