Author: AC Coordinator / AIUB/CODE Rapid IGS Orbit Prediction Combination - Week 1045 Day: 4 (Jan 20, 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 -------+--------------- JPP | 15 JPP | 14 JPP | ALL (high Transformation - See Table 1) SIP | 14 SIP | 18 ESP | 14 USP | 14 ESP | 15 USP | 15 ESP | 16 SIP | 15 ESP | 18 USP | 29 EMP | 14 EMP | 15 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 COP | 15 COP | 18 EMP | 18 _______________________________________________________________________________ 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 1.1045.4 GPS week: 1045 Day: 4 MJD: 51563.0 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS --------|------------------------------------------------|--------------------- cop n/a|0.00 0.00-0.04 -0.04 0.20 -0.17 0.0 0.46 0.23 | 0.0 0.0 0.0 emp n/a|0.00-0.01 0.03 -0.33 0.08 2.13 0.2 0.38 0.38 | 0.0 0.0 0.0 esp n/a|0.00 0.00 0.16 -0.31 -0.69 -2.59 0.2 2.14 0.34 | 0.0 0.0 0.0 gfp n/a|0.00 0.00-0.03 0.57 0.10 1.19 0.1 0.48 0.21 | 0.0 0.0 0.0 jpp n/a|0.33-0.07 0.30-15.25 -3.16 61.29 10.111.2211.51 | 0.0 0.0 0.0 sip n/a|0.00-0.01-0.04 -1.13 -1.15 -4.39 -0.5 2.07 1.20 | 0.0 0.0 0.0 usp n/a|0.00 0.00-0.03 0.09 0.30 0.80 0.2 1.55 0.36 | 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 2.1045.4 GPS week: 1045 Day: 4 MJD: 51563.0 Weighted Average PRN | cop emp esp gfp jpp sip usp IGP | ------|----------------------------------| 1E | 23 69 57 155 725 48 53 37 | 2 | 9 10 24 21 >>> 39 48 10 | 3 | 13 15 36 8 407 111 31 11 | 4 | 5 37 16 13 >>> 25 30 9 | 5 | 6 26 15 10 >>> 25 34 8 | 6 | 29 18 28 17 315 335 130 28 | 7 | 74 52 28 36 272 130 372 57 | 8 | 22 17 55 22 963 179 35 17 | 9 | 8 13 39 20 >>> 261 13 17 | 10 | 18 17 26 10 >>> 222 27 15 | 11 | 13 25 13 15 --- 250 28 17 | 13E | 74 15 168 22 433 134 6 36 | 16 | 175 119 >>> 149 >>> 102 79 73 | 17 | 16 40 35 27 >>> 63 5 13 | 19 | 10 61 24 15 639 468 11 30 | 21 | 12 10 31 13 >>> 350 31 22 | 22 | 8 16 50 32 827 130 20 14 | 24 | 14 34 15 8 >>> 355 28 23 | 25 | 30 15 58 33 744 248 26 21 | 26E | 22 19 94 31 --- 224 140 30 | 27 | 9 15 28 6 602 16 13 7 | 29E | 55 32 126 31 778 170 606 34 | 30 | 13 8 25 12 >>> 111 15 9 | 31 | 17 25 23 9 610 33 128 19 | ------|----------------------------------| RMS | 46 38 214 48 >>> 207 155 | WRMS | 23 38 34 21 >>> 120 36 | MEDI | 15 19 30 19 895 132 31 |