From: Weber Robert Author: IGEX AC Coordinator Date: 03 Jun 1999 22:30:49 Subject: [IGEXMail-0362] Wk 0989 IGEX Orbits Report Precedence: bulk ****************************************************************************** IGEX Electronic Mail 03-Jun-1999 22:30:49 Message No 0362 ****************************************************************************** Author: Weber Robert Subject: Wk 0989 IGEX Orbits Report Author: IGEX AC Coordinator IGX Orbit Combination - Week 0989 (Dec 20, 1998 - Dec 26, 1998) Contact: R. Weber (rweber@luna.tuwien.ac.at), COMBINATION STRATEGY: All satellite positions referring to one IGEX Analysis Center, one satellite, and one week are used as pseudo-observations to establish a seven-day arc. Usually, fifteen parameters (six initial conditions and nine radiation pressure parameters) are estimated in this orbit determination procedure per arc, satellite and center. The Earth Orientation Parameters (EOPs) are fixed to the values of the Final IGS (GPS) combination in our long-arc analysis. The combined IGEX solution is then produced using weighted mean values for all GLONASS satellite positions from all centers ( L1-norm ). The center-specific weights are based on the RMS values of the long-arc fit. The seven parameters of the Helmert transformations between the individual centers' solutions with respect to the combined solution are given for each day and each center in Tables 2.0989.x. PRODUCTS GENERATED: The combined IGEX-ephemerides are written to daily files in the SP3 format. The satellite accuracy CODes in the header are based on the weighted RMS for each satellite. Note, that the result files contain all satellites that were analyzed by at least one center. We refer to the "REMARKS" section of the combination report, if a satellite or center was excluded from the combination. The following naming convention is used for the result files: IGX09890-6.SP3 IGEX Glonass ephemerides files for days 0-6 of GPS week 0989 in the SP3 format. IGX09897.SUM Combination report for GPS week 0989. REMARKS concerning the IGEX Orbit Combination: 1. The satellite clock values in the combined orbit files are broadcast clock values. The value of 999999.999999 microseconds, according to the sp3 format convention, is used to indicate that no clock solution is available. 2. The following orbit solutions were excluded from the combination because they were biasing the weighted average (generally indicated by long arc RMS). | Centre | SAT list +--------+--------------- | ESA | 10 | GFZ | 4,6,17 3. The combined orbits refer to the IGS-realization of the ITRF96. ORBIT COMBINATION AND EVALUATION STATISTICS: Table 1 summarizes the statistics for the long-arc (seven days) analysis. It gives for each satellite the position RMS for each individual center and for the combined orbit. Table 2 contains the transformation parameters w.r.t. the combination for each center and each day (Tables 2.0989.0-6). Table 3 contains the daily RMS for each satellite and center together with the computed satellite position RMS values for the combined orbits (Tables 3.0989.0-6). Table 1.0989 GPS week : 0989 MJD: 51167.0-51173.0 Long Arc Evaluation Satellite position RMS for the individual centers' orbits and for the combined orbit (IGX). "E" flags eclipsing satellites. "*" fewer than 7 days of data available. "--" not available in center solution. Units: cm. |--------------------------------------| | SAT | BKG COD ESA GFZ MCC IGX | |------|-------------------------------| | 3 | 11 6 9 71 7 5 | | 4 | 9 7 10 183 8 5 | | 6 | 15 7 12 237 11 7 | | 9 | 20 11 13 85 22 9 | | 10 | 52 27 340 -- -- 28 | | 11 | 19 10 14 33 -- 8 | | 13 | 18 9 14 15 -- 8 | | 16 | 26 17 24 46 24 12 | | 17E | 14 7 14 112 8 6 | | 20E | 8 8 22 62 6 5 | | 22E | 12 9 26 80 7 8 | |------|-------------------------------| |MEDIAN| 15 9 14 76 8 8 | |--------------------------------------| Table 2: Daily transformation parameters w.r.t. the combined IGX orbit. Units: meters (DX, DY, DZ, RMS), mas (RX, RY, RZ), ppb (SCL). Table 2.0989.0 GPS week: 0989 Day: 0 MJD: 51167.0 ----------------------------------------------------- CENT STA| DX DY DZ RX RY RZ SCL RMS| --------|-------------------------------------------| BKG 27|-0.01 0.00 0.00 -0.16 0.08 -1.16 -1.1 0.27| COD 23|-0.01 0.00-0.03 0.00 -0.02 -0.81 -0.6 0.21| ESA 33|-0.02 0.00 0.19 0.16 0.29 -1.05 1.1 0.30| GFZ 30|-0.05 0.13-0.23 -0.93 -0.39 -0.91 3.5 0.52| MCC --| 0.05 0.01-0.02 0.11 -0.61 6.26 0.5 0.84| ----------------------------------------------------- Table 2.0989.1 GPS week: 0989 Day: 1 MJD: 51168.0 ----------------------------------------------------- CENT STA| DX DY DZ RX RY RZ SCL RMS| --------|-------------------------------------------| BKG 27| 0.00-0.01 0.00 -0.08 -0.03 -1.20 0.4 0.25| COD 23| 0.00-0.01-0.05 0.13 -0.04 0.01 -0.6 0.19| ESA 33|-0.01 0.00 0.12 0.14 0.15 -1.46 0.3 0.30| GFZ 30|-0.12 0.16-0.02 -0.99 -1.69 -1.63 1.3 0.47| MCC --| 0.01 0.02 0.06 -0.31 0.02 3.72 0.2 0.72| ----------------------------------------------------- Table 2.0989.2 GPS week: 0989 Day: 2 MJD: 51169.0 ----------------------------------------------------- CENT STA| DX DY DZ RX RY RZ SCL RMS| --------|-------------------------------------------| BKG 27| 0.01-0.01-0.01 0.00 -0.06 -0.99 -0.5 0.20| COD 23| 0.01 0.00-0.05 0.14 -0.11 0.15 -0.7 0.16| ESA 33| 0.00 0.01 0.12 0.39 0.08 -0.18 1.4 0.31| GFZ 30|-0.10 0.09-0.15 -0.69 0.06 -3.01 1.4 0.59| MCC --| 0.00-0.01 0.05 -0.42 0.17 2.18 0.4 0.63| ----------------------------------------------------- Table 2.0989.3 GPS week: 0989 Day: 3 MJD: 51170.0 ----------------------------------------------------- CENT STA| DX DY DZ RX RY RZ SCL RMS| --------|-------------------------------------------| BKG 27| 0.00-0.01-0.01 0.05 -0.14 -0.91 -2.0 0.23| COD 23| 0.00 0.00-0.03 0.06 -0.19 0.14 0.2 0.13| ESA 33| 0.00-0.01 0.13 0.21 0.30 -0.99 0.5 0.26| GFZ 30| 0.00 0.06-0.19 -2.39 0.90 -3.14 2.5 0.57| MCC --| 0.02 0.00 0.02 -0.17 0.40 2.08 0.1 0.48| ----------------------------------------------------- Table 2.0989.4 GPS week: 0989 Day: 4 MJD: 51171.0 ----------------------------------------------------- CENT STA| DX DY DZ RX RY RZ SCL RMS| --------|-------------------------------------------| BKG 27|-0.01-0.01-0.02 -0.11 -0.25 -0.68 1.2 0.23| COD 23| 0.00-0.01-0.02 0.09 -0.20 -0.21 0.0 0.12| ESA 33| 0.01-0.02 0.12 0.38 0.34 -0.57 -0.6 0.31| GFZ 30|-0.03 0.17-0.12 -2.18 0.73 -2.28 -0.8 0.93| MCC --| 0.02 0.04 0.02 -0.12 0.55 2.19 -0.3 0.43| ----------------------------------------------------- Table 2.0989.5 GPS week: 0989 Day: 5 MJD: 51172.0 ----------------------------------------------------- CENT STA| DX DY DZ RX RY RZ SCL RMS| --------|-------------------------------------------| BKG 27| 0.01-0.01 0.02 0.10 -0.06 -0.16 3.7 0.22| COD 23| 0.01 0.00-0.02 0.02 -0.11 0.29 -0.6 0.13| ESA 33| 0.02 0.01 0.10 0.30 0.30 -0.94 -0.4 0.31| GFZ 30|-0.10 0.28-0.21 1.01 2.97 1.76 -1.0 1.01| MCC --|-0.02 0.03 0.03 -0.25 0.31 1.87 -0.6 0.49| ----------------------------------------------------- Table 2.0989.6 GPS week: 0989 Day: 6 MJD: 51173.0 ----------------------------------------------------- CENT STA| DX DY DZ RX RY RZ SCL RMS| --------|-------------------------------------------| BKG 27| 0.01 0.00 0.04 0.21 -0.05 -0.24 -2.9 0.27| COD 23| 0.01 0.00-0.04 0.04 -0.01 0.99 0.5 0.17| ESA 33| 0.01 0.00 0.11 0.26 0.46 -0.40 1.2 0.27| GFZ 30| 0.03 0.13-0.05 -0.64 -1.55 -1.97 -0.5 1.23| MCC --|-0.03-0.01 0.01 -0.16 -0.20 0.74 -0.1 0.56| ----------------------------------------------------- Table 3: Daily RMS difference w.r.t. combination per satellite and center. The IGX column gives the weighted RMS of the combination. "E" marks eclipsing satellites. Units: cm. Table 3.0989.0 GPS week: 0989 Day: 0 MJD: 51167.0 Weighted Average |---------------------------------| | SAT | BKG COD ESA GFZ MCC IGX | |------|--------------------------| | 3 | 16 8 9 38 19 13 | | 4 | 10 10 28 -- 24 13 | | 6 | 33 33 37 -- 121 26 | | 9 | 19 20 21 38 115 13 | | 10 | 29 8 -- -- -- 13 | | 11 | 9 9 15 33 -- 13 | | 13 | 17 7 21 18 -- 13 | | 16 | 34 39 40 66 108 51 | | 17E | 9 5 17 -- 10 13 | | 20E | 7 7 15 57 7 13 | | 22E | 28 24 23 33 26 26 | |---------------------------------| |Median| 17 9 21 38 25 | |---------------------------------| Table 3.0989.1 GPS week: 0989 Day: 1 MJD: 51168.0 Weighted Average |---------------------------------| | SAT | BKG COD ESA GFZ MCC IGX | |------|--------------------------| | 3 | 13 6 11 56 14 13 | | 4 | 11 7 25 -- 10 13 | | 6 | 25 19 42 -- 91 26 | | 9 | 13 24 21 19 147 13 | | 10 | 37 10 -- -- -- 13 | | 11 | 17 13 20 52 -- 13 | | 13 | 13 11 16 18 -- 13 | | 16 | 30 37 38 33 79 51 | | 17E | 14 3 31 -- 7 13 | | 20E | 10 9 24 55 10 13 | | 22E | 27 21 20 31 22 26 | |---------------------------------| |Median| 14 11 23 33 18 | |---------------------------------| Table 3.0989.2 GPS week: 0989 Day: 2 MJD: 51169.0 Weighted Average |---------------------------------| | SAT | BKG COD ESA GFZ MCC IGX | |------|--------------------------| | 3 | 13 3 13 71 8 13 | | 4 | 11 3 22 -- 11 13 | | 6 | 20 11 38 -- 66 13 | | 9 | 18 21 24 19 145 13 | | 10 | 20 5 -- -- -- 13 | | 11 | 9 16 24 52 -- 13 | | 13 | 10 9 16 15 -- 13 | | 16 | 20 33 26 33 59 26 | | 17E | 14 2 10 -- 7 6 | | 20E | 15 14 17 62 16 13 | | 22E | 24 16 51 71 18 26 | |---------------------------------| |Median| 15 11 23 52 17 | |---------------------------------| Table 3.0989.3 GPS week: 0989 Day: 3 MJD: 51170.0 Weighted Average |---------------------------------| | SAT | BKG COD ESA GFZ MCC IGX | |------|--------------------------| | 3 | 16 4 11 37 13 13 | | 4 | 12 4 19 -- 22 13 | | 6 | 27 8 22 -- 46 13 | | 9 | 18 24 16 22 106 13 | | 10 | 34 9 -- -- -- 13 | | 11 | 16 11 19 43 -- 13 | | 13 | 10 5 15 12 -- 13 | | 16 | 24 17 25 32 29 26 | | 17E | 11 3 10 -- 3 6 | | 20E | 12 13 36 54 13 13 | | 22E | 21 14 22 85 17 13 | |---------------------------------| |Median| 16 9 19 37 19 | |---------------------------------| Table 3.0989.4 GPS week: 0989 Day: 4 MJD: 51171.0 Weighted Average |---------------------------------| | SAT | BKG COD ESA GFZ MCC IGX | |------|--------------------------| | 3 | 12 7 17 56 20 13 | | 4 | 14 7 24 -- 26 13 | | 6 | 11 9 26 -- 44 13 | | 9 | 17 12 14 129 78 13 | | 10 | 50 13 -- -- -- 13 | | 11 | 19 10 15 29 -- 13 | | 13 | 11 6 11 14 -- 13 | | 16 | 24 8 42 28 35 26 | | 17E | 9 8 16 -- 12 13 | | 20E | 13 9 49 78 11 13 | | 22E | 19 13 18 78 14 13 | |---------------------------------| |Median| 14 9 18 56 23 | |---------------------------------| Table 3.0989.5 GPS week: 0989 Day: 5 MJD: 51172.0 Weighted Average |---------------------------------| | SAT | BKG COD ESA GFZ MCC IGX | |------|--------------------------| | 3 | 12 13 19 120 33 13 | | 4 | 10 11 23 -- 25 13 | | 6 | 22 11 23 -- 49 13 | | 9 | 20 11 14 115 50 13 | | 10 | 17 5 -- -- -- 13 | | 11 | 13 9 19 33 -- 13 | | 13 | 16 4 14 13 -- 13 | | 16 | 21 10 45 79 71 26 | | 17E | 12 14 19 -- 26 13 | | 20E | 9 9 43 66 9 13 | | 22E | 18 15 16 96 16 13 | |---------------------------------| |Median| 16 11 19 79 30 | |---------------------------------| Table 3.0989.6 GPS week: 0989 Day: 6 MJD: 51173.0 Weighted Average |---------------------------------| | SAT | BKG COD ESA GFZ MCC IGX | |------|--------------------------| | 3 | 25 18 31 186 54 26 | | 4 | 10 13 29 -- 30 13 | | 6 | 19 11 23 -- 54 13 | | 9 | 13 11 15 48 48 13 | | 10 | 44 12 -- -- -- 13 | | 11 | 8 10 20 34 -- 13 | | 13 | 9 8 14 11 -- 13 | | 16 | 18 14 35 177 86 26 | | 17E | 22 17 10 -- 28 13 | | 20E | 11 11 16 81 11 13 | | 22E | 16 17 25 51 17 13 | |---------------------------------| |Median| 16 12 22 51 39 | |---------------------------------| End of report: Week 0989 -- ___________________________________________________________________________ Robert Weber Tel: ++43-1-58801-12865 Department for Theoretical Geodesy Fax: ++43-1-58801-12896 University of Technology, Vienna E-Mail: rweber@luna.tuwien.ac.at Gusshausstrasse 27-29 robweber@aiub.unibe.ch A-1040 Vienna, Austria ___________________________________________________________________________