Author: AC Coordinator / AIUB/CODE Rapid IGS Orbit Prediction Combination - Week 1057 Day: 6 (Apr 15, 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 ----+------------+----------- 24 | 2000_04_14 | 2000053 24 | 2000_04_13 | 2000053 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 -------+--------------- EMP | 14 ESP | 14 SIP | 15 SIP | 16 JPP | 2 SIP | 31 JPP | 15 JPP | 17 SIP | 3 COP | 15 EMP | 15 SIP | ALL (high Transformation - See Table 1) USP | 19 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 -------+----- COP | 14 ESP | 15 GFP | 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 1.1057.6 GPS week: 1057 Day: 6 MJD: 51649.0 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS --------|------------------------------------------------|--------------------- cop n/a|0.00 0.00 0.02 -0.50 -0.76 -0.70 0.4 0.23 0.19 | 0.0 0.0 0.0 emp n/a|0.00 0.00 0.01 -1.23 -1.12 0.35 0.3 0.36 0.34 | 0.0 0.0 0.0 esp n/a|0.00 0.00-0.03 -0.29 0.32 -1.28 0.1 0.24 0.20 | 0.0 0.0 0.0 gfp n/a|-.01 0.00 0.02 0.78 -0.10 -0.30 -0.4 0.26 0.22 | 0.0 0.0 0.0 jpp n/a|0.00 0.00 0.02 0.63 1.44 2.60 0.3 1.01 1.16 | 0.0 0.0 0.0 sip n/a|0.02-0.01 0.03 -0.75 0.64 -7.59 -1.6 1.23 0.87 | 0.0 0.0 0.0 usp n/a|0.00 0.00 0.01 0.38 -0.48 -0.86 -0.2 0.30 0.35 | 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 2.1057.6 GPS week: 1057 Day: 6 MJD: 51649.0 Weighted Average PRN | cop emp esp gfp jpp sip usp IGP | ------|----------------------------------| 1 | 18 11 19 19 11 71 20 8 | 2E | 15 30 43 15 364 80 96 91 | 3 | 18 25 42 16 22 226 15 11 | 4 | 20 12 32 22 13 54 16 9 | 5E | 15 46 7 23 13 23 29 11 | 6 | 11 28 11 9 9 163 24 7 | 7 | 24 10 10 6 44 65 33 11 | 8 | 11 14 8 18 12 69 16 6 | 9 | 24 22 16 6 23 87 10 8 | 10 | 6 5 6 11 6 77 28 6 | 11 | 58 13 9 49 16 80 25 15 | 13 | 9 16 13 8 12 25 5 5 | 16 | 47 75 25 52 38 373 16 20 | 17 | 46 116 65 75 294 28 28 79 | 18 | 16 8 16 5 12 31 15 6 | X19 | 89 98 --- 97 81 54 183 72 | 21 | 8 9 19 20 8 111 31 8 | 22E | 21 48 16 26 20 67 39 13 | 25 | 9 33 8 9 19 153 16 8 | 26 | 15 11 20 8 8 142 6 6 | 27 | 10 5 13 20 17 80 11 6 | 29 | 10 6 15 17 7 21 15 6 | 30 | 8 23 20 15 12 32 33 9 | X31 | 15 58 40 --- 15 319 127 30 | ------|----------------------------------| RMS | 23 36 24 26 101 123 30 | WRMS | 19 34 20 22 116 87 35 | MEDI | 15 19 16 17 14 74 22 |