From ESOC Thu Dec 30 01:42:39 1993 From: ESOC (ESOC) Date: Thu, 30 Dec 1993 1:42:39 PST Subject: [IGSREPORT-0682] Subject Message-ID: IGS Electronic Report Thu Dec 30 1:42:39 PST 1993 Message Number 0682 ****************************************************************************** Author: ESOC IGS-team Subject: Subject: ESA07287.SUM Subject: ESA07287.SUM ------------------------- ANALYSIS CENTRE: ESA/ESOC ------------------------- OUTLINE OF THE ESTIMATION OF GPS-ORBITS AND EARTH ROTATION PARAMETERS AT THE ESOC PROCESSING CENTRE FOR IGS J.M.Dow, T.Martin-Mur, J.Feltens, C.Garcia-Martinez Description of analysis for period 1993 Dec 19 - Dec 25 (week 0728) 1. SOFTWARE USED: GPSOBS/BAHN-Version 5 2. MODELS USED AND PARAMETERS ESTIMATED/FIXED: For a description of models and parameters used ==> see IGS - Mail 51 For updates of the models and parameters used ==> see IGS - Mail 114 and see IGS - Rep. 224,277 3. REMARKS: - In context with IGS mail 414 - Recommendations for Analysis Centers - we told in our summary of last week (0727), that we are using ITRF92 coordinates in our IGS processing. That's not correct: We are using the ITRF91 coordinates, that have been published at the Berne IGS workshop March 24-27 1993. - Since we had problems with KOKB on days 353, 354 and 355, we had excluded it from our IGS processing for these days. As can be seen in table 5, on day 353 the orbital overlaps between our fitted and extrapolated orbits are bad, especially for PRNs #12, #31, #09. However, orbit comparisons of our fitted orbits with the results of another analysis centre have shown agreement within the level of several decimeters. This is valid for days 354 and 355 too. Also our ERPs improved significantly after KOKB had been excluded. 4. GROUND STATIONS: Boucher and Altamimi, IGS workshop Berne 24-27 March'93 IGS/IERS station coordinates in the ITRF91 at 1992.6 _________________________________________________________________ GPSweek|ALGO GOLD KOKB MADR PAMA SANT TROM YAR1 |f |e |t 0728___| FAIR HART KOSG MASP PERT TAIW USUD YELL |i |s |o |DAY| FORT KIRU KOUR MATE RCM5 TIDB WETT |x.|t.|t. ---|---|------------------------------------------------|--|--|-- |353| FFe FFe -Fe Fee eee FeF FeF Fe |11|11|22 |354| FFe FFe -Fe Fee eee FeF FeF Fe |11|11|22 |355| FFe FFe -Fe Fee eee FeF FeF Fe |11|11|22 |356| FFe FFe FFe Fee eee FeF FeF Fe |12|11|23 |357| FFe FFe FFe Fee eee FeF FeF Fe |12|11|23 |358| FF- FFe FFe Fee eee FeF Fe- Fe |11|10|21 |359| FF- FFe FFe Fee eee FeF Fe- Fe |11|10|21 with: "F" ... coordinates of ground station kept fixed, "e" ... coordinates of ground station estimated, "-" ... ground station not included on that day. 5. ORBIT FIT MINUS EXTRAPOLATION FROM PREVIOUS DAY, RMS IN \DAY| 353 354 355 356 357 358 359 \ | \ | SAT\| ----|------------------------------------------- 02 | 97 73 60 60 47 67 57 03 | 113 55 64 57 74 80 76 12 | 352 68 72 73 128 76 172 13 | 101 58 37 67 44 42 38 14 | 144 60 61 57 90 114 64 15 | 62 77 60 76 69 57 135 16 | 111 57 35 39 33 39 38 17 | 144 98 88 59 68 116 77 18 | 80 68 54 35 73 64 78 19 | 49 59 62 57 92 54 88 20 | 112 66 76 56 86 83 55 21 | 50 63 96 54 69 54 46 22 | 255 136 151 90 94 118 69 23 | 263 126 121 128 152 128 145 24 | 89 55 59 70 59 73 84 25 | 219 99 61 46 58 53 74 26 | 202 73 86 66 77 53 50 27 | 64 71 56 61 69 66 55 28 | 64 49 54 59 48 58 73 01 | 140 71 37 68 69 45 97 29 | 145 95 66 120 164 88 122 31 | 569 59 50 52 89 89 92 07 | 102 61 61 60 58 62 69 09 | 545 62 112 100 191 82 120 05 | 97 111 106 99 95 112 66 04 | 140 118 74 118 79 82 98 6. PRODUCTS GENERATED: The following products are generated and stored in CDDIS at NASA/GSFC: ESA0728*.EPH - Precise GPS orbits and clocks, * = day of the week (0-6) ESA07287.ERP - Earth rotation results for week 0728 (including DUT1R) ESA07287.SUM - This summary file End of Message