Author: AC Coordinator / AIUB/CODE Rapid IGS Orbit Prediction Combination - Week 1044 Day: 4 (Jan 13, 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: 0. Delayed submission! 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 | 14 SIP | 15 USP | 15 ESP | 15 SIP | 19 COP | 14 SIP | 1 SIP | 16 SIP | ALL GFP | 3 COP | 18 ESP | 14 ESP | 16 COP | 15 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 -------+----- EMP | 14 EMP | 15 COP | 16 _______________________________________________________________________________ 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 1.1044.4 GPS week: 1044 Day: 4 MJD: 51556.0 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS --------|------------------------------------------------|--------------------- cop n/a|0.00 0.00-0.03 -0.01 -0.15 -0.55 0.2 1.04 0.16 | 0.0 0.0 0.0 emp n/a|0.00 0.00 0.02 0.34 0.01 -1.99 -0.2 0.33 0.24 | 0.0 0.0 0.0 esp n/a|0.03-0.01 0.14 0.26 0.39 8.41 0.4 0.62 0.41 | 0.0 0.0 0.0 gfp n/a|-.01 0.00-0.05 -0.45 -0.05 -0.44 -0.3 1.20 0.41 | 0.0 0.0 0.0 sip n/a|-.03 0.01 0.01 -0.17 -1.31 -2.02 -1.5 3.40 1.80 | 0.0 0.0 0.0 usp n/a|-.01 0.01-0.04 -0.74 0.28 -2.57 0.4 0.86 0.45 | 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 2.1044.4 GPS week: 1044 Day: 4 MJD: 51556.0 Weighted Average PRN | cop emp esp gfp sip usp IGP | ------|------------------------------| 1 | 27 4 17 38 798 17 11 | 2 | 19 18 29 16 234 25 10 | 3E | 38 30 107 526 244 135 39 | 4 | 25 5 51 9 106 15 12 | 5 | 14 16 10 9 65 13 7 | 7E | 29 14 121 33 183 122 31 | 8 | 11 17 17 18 125 44 10 | 9 | 24 7 10 19 30 25 9 | 10 | 42 26 29 62 316 20 19 | 11 | 76 5 95 61 234 31 29 | 13E | 8 18 31 43 162 52 14 | 17 | 5 4 49 7 34 72 15 | 18E | 484 128 170 32 419 205 81 | 19 | 14 49 42 50 968 256 44 | 21 | 10 6 33 10 20 9 7 | 22 | 7 20 27 29 315 9 10 | 24 | 14 21 86 50 494 68 22 | 25 | 12 25 31 18 196 64 14 | 26E | 20 11 15 45 340 46 13 | 27 | 16 11 24 23 55 8 8 | 29E | 15 8 22 82 60 58 18 | 30 | 15 8 15 6 148 23 7 | 31E | 12 37 48 157 146 21 31 | ------|------------------------------| RMS | 104 33 62 120 340 86 | WRMS | 16 24 41 41 180 45 | MEDI | 15 16 31 32 183 31 |