Author: AC Coordinator / AIUB/CODE Rapid IGS Orbit Prediction Combination - Week 1044 Day: 3 (Jan 12, 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 ----+------------+----------- 06 | 2000_01_11 | 2000008 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 -------+--------------- SIP | 15 COP | 14 SIP | 16 SIP | 14 SIP | ALL (high Transformation - See Table 1) ESP | 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 1.1044.3 GPS week: 1044 Day: 3 MJD: 51555.0 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS --------|------------------------------------------------|--------------------- cop n/a|0.01 0.01-0.05 -0.15 -0.13 1.26 -0.2 0.59 0.23 | 0.0 0.0 0.0 emp n/a|0.00 0.00 0.02 0.19 0.12 -1.56 -0.1 0.17 0.17 | 0.0 0.0 0.0 esp n/a|-.01 0.00 0.10 0.16 0.71 3.52 -0.1 0.56 0.41 | 0.0 0.0 0.0 sip n/a|-.01-0.02 0.11 -0.26 0.45 -4.13 -3.6 2.25 1.07 | 0.0 0.0 0.0 usp n/a|0.00 0.00-0.04 -0.62 -0.64 0.20 0.7 0.77 0.55 | 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 2.1044.3 GPS week: 1044 Day: 3 MJD: 51555.0 Weighted Average PRN | cop emp esp sip usp IGP | ------|--------------------------| 1 | 52 8 47 164 10 17 | 2 | 13 14 52 40 11 13 | 3E | 42 9 149 174 127 43 | 4 | 35 6 45 233 27 14 | 5 | 14 9 24 35 14 8 | 7E | 51 23 84 201 102 32 | 8 | 34 14 15 255 35 13 | 9 | 16 9 38 191 11 10 | 10 | 14 12 50 80 22 13 | 11 | 143 7 54 104 153 50 | 13 | 12 10 37 88 25 11 | X14 | >>> --- 106 597 97 102 | X15 | 53 21 333 >>> --- 32 | 16 | 207 48 110 679 36 62 | 17 | 25 9 53 280 118 28 | 18E | 26 15 19 51 37 13 | 19 | 61 13 88 113 239 55 | 21 | 12 7 20 49 19 7 | 22 | 19 9 22 269 7 8 | 24 | 15 22 47 240 34 16 | 25 | 35 15 20 268 13 12 | 26 | 6 3 35 --- 39 11 | 27 | 10 6 11 281 18 6 | 29E | 24 19 23 248 28 13 | 30 | 20 8 24 149 20 9 | 31E | 44 38 41 98 95 29 | ------|--------------------------| RMS | 59 17 56 225 77 | WRMS | 23 17 41 107 55 | MEDI | 26 10 43 191 28 |