| Date: | 2004-07-27 07:15:00 | |
| Sender: | Ron Noomen <Ron Noomen <ron@astro.lr.tudelft.nl>> | |
| Subject: | [SLR-Report] No. 4132: Delft QL Report July 27, 2004 | |
| Author: | Ron Noomen | |
| Content: | ******************************************************************************** SLR Electronic Report 2004-07-27 07:15:00 UTC Message No. 4132 ******************************************************************************** Author: Ron Noomen Subject: Delft QL Report July 27, 2004 WEGENER-2 IERS REPORT OF THE QUICK-LOOK DATA ANALYSIS CENTER DELFT UNIVERSITY OF TECHNOLOGY FACULTY OF AEROSPACE ENGINEERING THE NETHERLANDS July 27, 2004 This is a weekly report, presenting the results of a continuing analysis of the most recent global LAGEOS-1 and LAGEOS-2 quick-look laser ranging data. The report consists of (A) a pass summary, (B) an overview of the analysis results, detailed statistics of the analysed measurements, and an accumulative pass overview and (C) the earth rotation parameter solutions submitted to IERS. The report is based on all quick-look data as received until Mon, Jul 26, 2004. Questions and comments should be addressed to: R. Noomen Delft University of Technology Faculty of Aerospace Engineering Delft Institute for Earth-Oriented Space Research Kluyverweg 1 2629 HS Delft The Netherlands Telephone: +31-15-2785377 Telefax : +31-15-2785322 E-mail : ron.noomen@deos.tudelft.nl A. PASS SUMMARY The table below gives an overview of the ranging data both on LAGEOS-1 and LAGEOS-2, as received by the Quick-Look Data Analysis Center (QLDAC) on Mon, Jul 26, 2004. All data were obtained through the NASA Crustal Dynamics Data Information system (CDDIS) and the Eurolas Data Center (EDC) in Germany. The data are unscreened and may span more than a week due to late reporting by the stations. ------------------------------------------------------------------------------ Station System/Location Period No. of Passes ID LAGEOS-1 LAGEOS-2 ------------------------------------------------------------------------------ 1824 Kiev, Ukraine 040722 - 040724 2 2 1864 Maidanak, Uzbekistan (site 2) 040709 - 040725 13 9 1873 Simeiz, Crimea, Ukraine 040709 - 040723 13 8 1884 Riga, Latvia 040712 - 040725 5 - 1893 Kazivili, Crimea, Ukraine 040715 - 040723 5 5 7080 McDonald Obs., Fort Davis, TX 040712 - 040724 9 10 7090 Yarragadee, Australia 040716 - 040726 14 14 7105 Greenbelt, Maryland 040714 - 040722 6 7 7110 Monument Peak, California 040712 - 040725 23 13 7124 Papeete, Tahiti 040713 - 040726 4 4 7237 Changchun, China 040707 - 040725 13 9 7249 Beijing, China 040705 - 040713 6 6 7355 Urumqi, China (TROS) 040712 - 040722 11 9 7501 Hartebeesthoek, SA (MOB-6) 040712 - 040722 - 3 7806 Metsahovi, Finland 040720 - 040725 2 3 7810 Zimmerwald 423, Switzerland 040714 - 040726 26 15 7811 Borowiec, Poland 040719 - 040723 4 2 7824 San Fernando, Spain 040712 - 040721 3 4 7832 Riyad, Saudi Arabia 040712 - 040726 13 25 7835 Grasse, France 040712 - 040722 6 4 7837 Shanghai Observatory, China 040715 - 040726 8 8 7838 Simosato Observatory, Japan 040714 - 040723 9 5 7839 Graz, Austria 040711 - 040726 22 17 7840 Herstmonceux, United Kingdom 040712 - 040724 17 12 7841 Potsdam, Germany 040721 - 040725 5 3 7845 Grasse, France (LLR) 040712 - 040712 1 - 7941 Matera, Italy (MLRO 532) 040713 - 040725 43 38 8834 Wettzell, Germany 040716 - 040725 32 21 ------ ------ --- --- TOTAL 040705 - 040726 315 256 ------------------------------------------------------------------------------ B. ANALYSIS RESULTS The analysis is based on two orbit solutions using global quick-look normal points that cover a period of 8 days which are computed simultaneously. This week´s data interval runs from Sat, Jul 17, 2004 to Sun, Jul 25, 2004. The measurement and dynamic models used in this analysis are close to the IERS Standard. The overall model is referred to as QLDACMOD11. The details of this model can be obtained on request. The terrestrial reference frame is provided by the ITRF2000 station coordinates solution (extended with coordinates of new stations, where necessary). The general statistics and results of this week´s analysis are thus: ----------------------------------------------------------------------- Satellite LAGEOS-1 LAGEOS-2 Number of Stations 25 25 Number of Passes 198/193 169/163 Number of Normal Points 1883/1827 1734/1661 Weighted RMS of Fit (mm) 15 13 ----------------------------------------------------------------------- Residual statistics per station. The header line for each station shows the station id, its name, whether the position is solved for or not and the measurement accuracy in mm. Rejected observations are not used for the calculation of the rms-of-fit, the biases or the scatter. The latter holds w.r.t. the residual trend line described by the bias estimates. Uncertainties are 3-sigma values. -------------------------------------------------------------------------------- Date Time Sat. Obs. RMS Range Bias Time Bias Scatter tot/rej (mm) (mm) (us) (mm) -------------------------------------------------------------------------------- Station 1824 (Kiev) (position solved, acc. 200 mm) 1824 22 Jul 04 19:30 LAG2 4 0 1582 4784 +-1102 6924 +-1501 761*CHK* 1824 22 Jul 04 22:23 LAG1 9 0 177 -392 +- 737 -265 +- 381 43 1824 22 Jul 04 23:17 LAG2 6 0 62 -204 +-1472 -87 +- 853 13 1824 24 Jul 04 19:49 LAG1 3 0 102 -513 +-2208 -297 +-1453 29 Station 1864 (Maidanak) (position fixed, acc. 200 mm) 1864 17 Jul 04 18:37 LAG1 6 0 25 -19 +- 250 -4 +- 235 15 1864 18 Jul 04 17:11 LAG1 5 0 19 19 +- 377 2 +- 342 7 1864 18 Jul 04 19:03 LAG2 9 0 21 -11 +- 200 -4 +- 169 17 1864 18 Jul 04 20:41 LAG1 8 0 28 -24 +- 213 -6 +- 156 9 1864 20 Jul 04 17:53 LAG1 7 0 22 -21 +- 234 -2 +- 154 9 1864 21 Jul 04 16:39 LAG1 6 0 18 -2 +- 467 10 +- 428 12 1864 21 Jul 04 17:31 LAG2 3 0 16 34 +-1214 62 +-2643 12 1864 21 Jul 04 20:27 LAG1 3 0 17 77 +-3124 -37 +-1881 5 1864 21 Jul 04 21:15 LAG2 4 0 34 186 +-4481 108 +-2236 6 1864 22 Jul 04 18:39 LAG1 6 0 16 -14 +- 248 -4 +- 139 5 1864 22 Jul 04 19:23 LAG2 8 0 27 -16 +- 213 13 +- 141 12 1864 23 Jul 04 17:37 LAG2 7 0 35 -13 +- 227 6 +- 201 31 1864 23 Jul 04 20:53 LAG1 6 0 37 -37 +- 244 0 +- 136 8 1864 24 Jul 04 19:26 LAG1 5 0 35 -40 +- 410 -7 +- 258 11 1864 24 Jul 04 19:47 LAG2 7 0 27 -27 +- 243 15 +- 213 7 Station 1873 (Simeiz) (position fixed, acc. 200 mm) 1873 17 Jul 04 20:55 LAG2 10 2 415 373 +- 212 9 +- 389 182*CHK* 1873 17 Jul 04 22:19 LAG1 4 0 256 245 +- 300 58 +- 279 49 1873 18 Jul 04 20:53 LAG1 5 0 258 227 +- 765 -26 +- 607 17 1873 19 Jul 04 23:13 LAG1 3 0 388 385 +- 350 -229 +-1721 73 1873 20 Jul 04 21:31 LAG1 10 1 617 601 +- 417 26 +- 235 258*CHK* 1873 20 Jul 04 23:21 LAG2 11 1 462 521 +- 380 -57 +- 300 49*CHK* 1873 21 Jul 04 20:27 LAG1 7 1 524 546 +- 383 -44 +- 402 100*CHK* 1873 21 Jul 04 21:23 LAG2 6 0 596 648 +- 282 -112 +- 252 36*CHK* 1873 21 Jul 04 23:55 LAG1 8 0 449 445 +- 215 41 +- 321 80*CHK* 1873 22 Jul 04 22:21 LAG1 4 0 343 -2700 +-3688 -1302 +-1658 167 1873 22 Jul 04 23:23 LAG2 5 0 177 297 +- 839 125 +- 782 24 1873 23 Jul 04 21:09 LAG1 3 0 292 227 +-1666 -55 +-1404 32 1873 23 Jul 04 21:31 LAG2 5 0 250 43 +- 724 -213 +- 835 107 Station 1884 (Riga) (position fixed, acc. 100 mm) 1884 17 Jul 04 22:21 LAG1 12 0 22 22 +- 91 1 +- 77 7 1884 20 Jul 04 21:41 LAG1 18 0 23 13 +- 71 -10 +- 44 6 Station 1893 (Kazivili) (position fixed, acc. 100 mm) 1893 17 Jul 04 20:57 LAG2 5 0 65 -52 +- 156 56 +- 431 5 1893 18 Jul 04 20:47 LAG1 9 0 19 13 +- 216 3 +- 134 16 1893 18 Jul 04 22:49 LAG2 9 0 13 24 +- 255 10 +- 180 4 1893 20 Jul 04 21:39 LAG1 6 0 14 9 +- 353 -2 +- 254 6 1893 23 Jul 04 21:11 LAG1 4 0 37 57 +- 342 32 +- 423 10 1893 23 Jul 04 21:33 LAG2 8 0 11 -3 +- 109 2 +- 177 10 Station 7080 (McDonald Obs.) (position fixed, acc. 20 mm) 7080 17 Jul 04 06:01 LAG2 8 0 5 -5 +- 32 0 +- 43 1 7080 17 Jul 04 07:00 LAG1 15 0 15 11 +- 17 7 +- 10 2 7080 18 Jul 04 16:21 LAG2 8 0 26 -18 +- 35 6 +- 25 1 7080 18 Jul 04 18:23 LAG1 7 0 8 0 +- 34 4 +- 39 8 7080 18 Jul 04 21:45 LAG1 9 0 8 -12 +- 38 -8 +- 27 4 7080 23 Jul 04 05:51 LAG1 11 0 22 21 +- 27 0 +- 17 4 7080 23 Jul 04 06:28 LAG2 7 0 2 4 +- 61 2 +- 50 1 7080 24 Jul 04 04:50 LAG1 5 0 3 4 +- 50 -6 +- 68 1 7080 24 Jul 04 05:04 LAG2 4 0 18 44 +- 349 -15 +- 206 2 Station 7090 (Yarragadee) (position fixed, acc. 10 mm) 7090 17 Jul 04 04:31 LAG2 5 0 4 -10 +- 211 2 +- 102 1 7090 17 Jul 04 05:01 LAG1 16 0 16 -16 +- 10 -2 +- 5 2 7090 17 Jul 04 21:05 LAG1 16 0 7 7 +- 10 1 +- 7 2 7090 18 Jul 04 03:59 LAG1 8 0 20 -19 +- 27 -1 +- 21 2 7090 18 Jul 04 10:19 LAG2 12 0 9 -5 +- 12 4 +- 9 0 7090 18 Jul 04 14:27 LAG2 21 0 15 2 +- 9 7 +- 4 5 7090 18 Jul 04 16:15 LAG1 19 0 16 -13 +- 9 -5 +- 7 4 7090 18 Jul 04 19:41 LAG1 17 0 9 8 +- 10 -3 +- 5 2 7090 18 Jul 04 23:15 LAG1 7 0 10 -10 +- 17 -3 +- 34 4 7090 19 Jul 04 02:43 LAG1 5 0 3 -5 +- 60 5 +- 52 2 7090 19 Jul 04 04:46 LAG2 4 0 8 -33 +- 294 11 +- 133 0 7090 19 Jul 04 08:25 LAG2 13 0 6 2 +- 13 -5 +- 15 2 7090 21 Jul 04 08:37 LAG2 16 0 12 -10 +- 10 -3 +- 7 2 7090 21 Jul 04 12:43 LAG2 16 0 5 -3 +- 10 1 +- 5 3 7090 23 Jul 04 08:49 LAG2 19 0 10 0 +- 9 -6 +- 6 3 7090 23 Jul 04 13:01 LAG2 21 0 9 0 +- 9 4 +- 4 4 7090 23 Jul 04 16:23 LAG1 21 0 11 -9 +- 9 -4 +- 5 3 7090 23 Jul 04 20:07 LAG1 5 0 3 -6 +- 48 -8 +- 50 1 7090 24 Jul 04 06:19 LAG1 12 0 4 -3 +- 17 4 +- 11 1 7090 24 Jul 04 07:19 LAG2 2 0 15 -23 +- 778 6 +- 727 0 7090 24 Jul 04 11:05 LAG2 20 0 3 -2 +- 9 -2 +- 6 1 Station 7105 (Greenbelt) (position fixed, acc. 10 mm) 7105 20 Jul 04 06:31 LAG1 8 0 18 3 +- 14 12 +- 10 5 7105 20 Jul 04 08:35 LAG2 4 0 2 -1 +- 44 -6 +- 101 1 7105 21 Jul 04 06:38 LAG2 3 0 6 0 +- 58 11 +- 116 0 7105 22 Jul 04 03:47 LAG1 14 0 5 -2 +- 11 -3 +- 8 1 7105 22 Jul 04 04:45 LAG2 3 0 11 5 +- 84 -4 +- 182 8 Station 7110 (Monument Peak) (position fixed, acc. 10 mm) 7110 17 Jul 04 00:39 LAG1 5 0 17 -14 +- 19 -13 +- 42 4 7110 17 Jul 04 03:53 LAG1 7 0 10 11 +- 17 -4 +- 19 2 7110 17 Jul 04 07:11 LAG1 8 0 19 12 +- 14 9 +- 11 2 7110 17 Jul 04 14:13 LAG2 6 0 7 -8 +- 20 -15 +- 50 1 7110 19 Jul 04 20:45 LAG1 4 4 0 0 +- 0 0 +- 0 0 7110 20 Jul 04 03:25 LAG1 7 0 12 -5 +- 20 -12 +- 34 3 7110 20 Jul 04 06:29 LAG1 12 0 14 13 +- 12 1 +- 6 3 7110 20 Jul 04 08:19 LAG2 4 0 3 3 +- 23 0 +- 72 0 7110 20 Jul 04 10:03 LAG1 9 0 12 -11 +- 14 7 +- 11 1 7110 20 Jul 04 12:25 LAG2 11 0 9 -8 +- 12 -2 +- 22 3 7110 21 Jul 04 05:15 LAG1 7 0 11 8 +- 16 -5 +- 10 4 7110 21 Jul 04 06:09 LAG2 9 0 7 8 +- 23 0 +- 18 0 7110 21 Jul 04 08:39 LAG1 19 0 3 1 +- 9 1 +- 5 2 7110 21 Jul 04 10:11 LAG2 13 0 6 1 +- 12 -3 +- 8 3 7110 21 Jul 04 21:17 LAG1 2 0 16 134 +- 729 89 +- 436 0 7110 22 Jul 04 07:15 LAG1 13 0 14 13 +- 11 -1 +- 7 1 7110 22 Jul 04 08:10 LAG2 11 0 5 1 +- 36 3 +- 21 1 7110 22 Jul 04 11:11 LAG1 5 0 23 -13 +- 39 -19 +- 71 2 7110 22 Jul 04 12:27 LAG2 4 0 10 -1 +- 23 -6 +- 18 5 7110 22 Jul 04 17:10 LAG2 5 0 8 -41 +- 100 24 +- 61 2 7110 23 Jul 04 03:03 LAG1 2 0 18 -14 +- 458 -3 +- 456 0 7110 23 Jul 04 06:01 LAG1 3 0 12 13 +- 342 0 +- 186 0 7110 23 Jul 04 06:19 LAG2 15 0 4 -4 +- 12 -1 +- 9 1 7110 23 Jul 04 09:27 LAG1 10 0 15 9 +- 15 -3 +- 9 7 7110 23 Jul 04 10:29 LAG2 16 0 10 7 +- 10 -4 +- 10 3 7110 23 Jul 04 14:59 LAG2 9 1 16 -14 +- 15 13 +- 18 6 Station 7124 (Papeete) (position fixed, acc. 10 mm) 7124 21 Jul 04 09:38 LAG2 2 0 15 19 +- 274 36 +- 282 0 7124 23 Jul 04 12:49 LAG1 2 0 2 0 +- 326 2 +- 277 0 7124 24 Jul 04 11:17 LAG1 5 0 4 -5 +- 168 -4 +- 72 1 Station 7237 (Changchun) (position fixed, acc. 50 mm) 7237 17 Jul 04 14:55 LAG1 2 0 30 -202 +-1192 -318 +-1682 0 7237 24 Jul 04 12:21 LAG1 10 0 16 8 +- 48 8 +- 33 5 7237 24 Jul 04 12:35 LAG2 2 0 20 -88 +-2778 67 +-2735 0 7237 24 Jul 04 15:43 LAG1 8 0 20 14 +- 56 8 +- 26 7 7237 24 Jul 04 15:55 LAG2 13 0 19 12 +- 42 5 +- 21 8 Station 7355 (Urumqi) (position solved, acc. 10 mm) 7355 17 Jul 04 15:07 LAG1 6 6 0 0 +- 0 0 +- 0 0 7355 17 Jul 04 17:05 LAG2 11 3 30 -16 +- 16 -41 +- 22 12 7355 21 Jul 04 16:31 LAG1 13 0 49 -34 +- 12 16 +- 9 20 7355 22 Jul 04 15:11 LAG1 16 3 27 -4 +- 11 15 +- 9 20 7355 22 Jul 04 15:51 LAG2 7 4 35 63 +- 117 -39 +- 158 5 7355 22 Jul 04 18:35 LAG1 14 1 29 -24 +- 14 -17 +- 10 20 7355 22 Jul 04 19:33 LAG2 20 0 43 27 +- 9 -13 +- 6 28 Station 7501 (Hartebeesthoek) (position fixed, acc. 10 mm) 7501 21 Jul 04 20:25 LAG2 8 0 15 45 +- 61 19 +- 34 0 7501 22 Jul 04 18:46 LAG2 3 0 22 25 +- 28 18 +- 64 0 Station 7806 (Metsahovi) (position fixed, acc. 30 mm) 7806 20 Jul 04 23:28 LAG2 2 0 15 31 +- 270 -33 +- 532 0 7806 22 Jul 04 22:41 LAG1 6 0 10 9 +- 68 0 +- 76 2 7806 22 Jul 04 23:23 LAG2 9 0 9 -4 +- 40 4 +- 44 6 Station 7810 (Zimmerwald 423) (position fixed, acc. 60 mm) 7810 17 Jul 04 02:41 LAG2 3 0 17 20 +- 129 20 +- 228 4 7810 17 Jul 04 06:49 LAG2 8 0 8 7 +- 65 -3 +- 94 1 7810 17 Jul 04 10:49 LAG2 9 0 13 7 +- 62 10 +- 73 2 7810 17 Jul 04 11:49 LAG1 19 0 9 1 +- 42 5 +- 27 4 7810 18 Jul 04 09:00 LAG2 7 0 22 21 +- 71 5 +- 135 1 7810 19 Jul 04 13:09 LAG1 5 0 32 33 +- 609 0 +- 290 1 7810 20 Jul 04 15:13 LAG1 2 0 2 -20 +-1317 22 +-1557 0 7810 21 Jul 04 17:03 LAG1 11 0 10 11 +- 61 3 +- 55 3 7810 21 Jul 04 20:33 LAG1 13 0 4 3 +- 61 0 +- 45 2 7810 22 Jul 04 05:11 LAG2 14 0 6 6 +- 49 2 +- 43 2 7810 22 Jul 04 09:21 LAG2 8 0 11 8 +- 64 5 +- 56 5 7810 22 Jul 04 12:01 LAG1 15 0 11 11 +- 48 0 +- 33 2 7810 22 Jul 04 15:45 LAG1 10 0 10 9 +- 62 -1 +- 57 3 7810 22 Jul 04 19:01 LAG1 11 0 13 15 +- 110 1 +- 69 1 7810 22 Jul 04 22:53 LAG1 6 0 8 21 +- 334 -14 +- 181 2 7810 22 Jul 04 23:39 LAG2 4 0 6 6 +- 637 -2 +- 378 5 7810 23 Jul 04 02:19 LAG1 4 0 23 23 +- 92 -6 +- 229 0 7810 23 Jul 04 07:15 LAG2 19 0 2 -2 +- 44 0 +- 30 1 7810 23 Jul 04 14:16 LAG1 12 0 14 10 +- 67 -3 +- 43 3 7810 24 Jul 04 23:20 LAG1 9 0 3 0 +- 62 -1 +- 44 3 7810 24 Jul 04 23:35 LAG2 7 0 8 4 +- 71 8 +- 109 3 Station 7811 (Borowiec) (position fixed, acc. 60 mm) 7811 19 Jul 04 23:11 LAG1 14 0 10 5 +- 50 5 +- 38 5 7811 20 Jul 04 01:00 LAG2 11 0 23 16 +- 56 7 +- 42 11 7811 21 Jul 04 20:39 LAG1 7 0 16 14 +- 156 1 +- 116 3 7811 22 Jul 04 00:02 LAG1 12 0 20 20 +- 56 -2 +- 53 4 7811 22 Jul 04 01:13 LAG2 5 0 11 18 +- 361 5 +- 285 2 7811 23 Jul 04 21:13 LAG1 1 0 24 0 +- 0 0 +- 0 0 Station 7824 (San Fernando) (position fixed, acc. 40 mm) 7824 20 Jul 04 00:49 LAG2 4 0 58 62 +- 82 9 +- 113 6 7824 20 Jul 04 02:45 LAG1 5 0 30 36 +- 88 14 +- 150 2 7824 20 Jul 04 23:05 LAG2 2 0 45 50 +- 187 -61 +-1957 0 7824 21 Jul 04 01:16 LAG1 7 0 66 65 +- 50 -1 +- 35 6 Station 7832 (Riyad) (position solved, acc. 20 mm) 7832 17 Jul 04 02:51 LAG2 8 0 41 43 +- 85 2 +- 80 3 7832 17 Jul 04 07:03 LAG2 8 0 6 -23 +- 102 -12 +- 60 2 7832 17 Jul 04 18:43 LAG1 4 0 15 -15 +- 33 14 +- 117 0 7832 18 Jul 04 20:55 LAG1 10 0 10 -7 +- 69 0 +- 31 4 7832 18 Jul 04 22:51 LAG2 11 0 9 -8 +- 21 -10 +- 27 1 7832 19 Jul 04 00:17 LAG1 7 0 10 -3 +- 24 -10 +- 60 9 7832 19 Jul 04 03:13 LAG2 14 0 21 20 +- 17 -1 +- 26 5 7832 19 Jul 04 07:22 LAG2 3 0 16 -41 +- 345 -37 +- 228 5 7832 19 Jul 04 19:37 LAG1 2 0 13 183 +- 659 -175 +- 637 0 7832 20 Jul 04 01:07 LAG2 7 0 4 0 +- 59 -2 +- 82 3 7832 20 Jul 04 05:29 LAG2 14 0 8 6 +- 17 2 +- 16 4 7832 20 Jul 04 18:05 LAG1 10 0 5 4 +- 20 0 +- 29 3 7832 20 Jul 04 19:13 LAG2 7 0 3 5 +- 39 -7 +- 57 1 7832 20 Jul 04 21:25 LAG1 12 0 13 -1 +- 19 -7 +- 11 4 7832 20 Jul 04 23:21 LAG2 10 0 27 -23 +- 56 -3 +- 45 2 7832 21 Jul 04 03:25 LAG2 12 0 10 8 +- 19 6 +- 17 3 7832 21 Jul 04 07:35 LAG2 11 0 7 6 +- 20 0 +- 19 3 7832 22 Jul 04 01:47 LAG2 8 0 6 -22 +- 104 20 +- 88 2 7832 22 Jul 04 05:39 LAG2 16 0 6 -3 +- 17 0 +- 15 4 7832 22 Jul 04 08:45 LAG1 4 0 13 12 +- 130 -1 +- 131 1 7832 23 Jul 04 07:45 LAG2 10 0 12 10 +- 20 3 +- 13 2 7832 23 Jul 04 21:01 LAG1 8 0 13 -9 +- 32 -3 +- 23 3 7832 23 Jul 04 21:39 LAG2 12 0 12 -26 +- 59 9 +- 34 3 7832 24 Jul 04 01:35 LAG2 9 0 8 1 +- 62 -7 +- 66 2 7832 24 Jul 04 05:58 LAG2 13 0 6 0 +- 20 -4 +- 13 2 7832 24 Jul 04 19:22 LAG2 4 0 11 14 +- 270 13 +- 149 4 7832 24 Jul 04 23:37 LAG2 11 0 11 -11 +- 20 2 +- 34 2 Station 7835 (Grasse) (position fixed, acc. 30 mm) 7835 19 Jul 04 23:05 LAG1 14 0 8 8 +- 25 1 +- 16 2 7835 20 Jul 04 00:57 LAG2 5 0 5 4 +- 83 12 +- 116 0 7835 20 Jul 04 21:35 LAG1 21 0 14 2 +- 20 -6 +- 9 4 7835 20 Jul 04 22:47 LAG2 25 0 2 0 +- 19 -1 +- 12 1 7835 22 Jul 04 22:21 LAG1 17 0 11 2 +- 23 -5 +- 11 2 7835 22 Jul 04 23:09 LAG2 11 0 2 -1 +- 33 -2 +- 29 1 Station 7837 (Shanghai Observatory) (position fixed, acc. 50 mm) 7837 18 Jul 04 13:35 LAG1 8 0 15 -10 +- 86 -4 +- 92 6 7837 18 Jul 04 16:45 LAG1 7 0 54 50 +- 248 -1 +- 123 7 7837 19 Jul 04 17:18 LAG2 18 0 24 3 +- 36 -18 +- 29 10 7837 20 Jul 04 14:07 LAG1 13 0 8 -5 +- 42 -4 +- 31 4 7837 20 Jul 04 15:25 LAG2 19 0 33 18 +- 35 -17 +- 26 18 7837 20 Jul 04 17:33 LAG1 17 0 77 -79 +- 38 -10 +- 28 5 7837 20 Jul 04 20:05 LAG2 6 0 29 -46 +- 593 10 +- 361 5 7837 21 Jul 04 13:47 LAG2 10 0 5 2 +- 77 0 +- 88 5 7837 21 Jul 04 16:11 LAG1 13 0 12 -3 +- 45 5 +- 26 5 7837 21 Jul 04 17:35 LAG2 9 0 16 5 +- 88 -10 +- 87 4 7837 23 Jul 04 17:57 LAG2 16 0 14 -17 +- 49 11 +- 42 3 Station 7838 (Simosato Observatory) (position fixed, acc. 30 mm) 7838 20 Jul 04 10:47 LAG1 12 0 21 21 +- 28 -6 +- 32 4 7838 20 Jul 04 14:04 LAG1 15 0 23 22 +- 25 -7 +- 16 6 7838 20 Jul 04 15:21 LAG2 26 0 23 22 +- 18 -1 +- 11 5 7838 20 Jul 04 17:33 LAG1 17 0 37 33 +- 24 -8 +- 22 7 7838 22 Jul 04 14:51 LAG1 18 0 14 13 +- 23 -3 +- 13 5 7838 22 Jul 04 15:35 LAG2 23 0 22 21 +- 20 2 +- 13 9 7838 23 Jul 04 13:42 LAG1 7 0 20 24 +- 51 -12 +- 55 9 7838 23 Jul 04 14:07 LAG2 11 0 33 34 +- 57 -1 +- 44 6 Station 7839 (Graz) (position fixed, acc. 10 mm) 7839 17 Jul 04 00:01 LAG1 9 0 9 -22 +- 58 12 +- 24 0 7839 17 Jul 04 02:23 LAG2 16 0 6 13 +- 21 8 +- 12 1 7839 17 Jul 04 18:48 LAG1 7 0 9 -5 +- 46 2 +- 30 0 7839 18 Jul 04 17:40 LAG1 11 0 5 0 +- 16 -3 +- 13 1 7839 18 Jul 04 20:55 LAG1 13 0 4 -1 +- 12 -3 +- 9 1 7839 18 Jul 04 22:45 LAG2 18 0 6 -3 +- 10 -4 +- 8 1 7839 19 Jul 04 00:33 LAG1 16 0 7 -8 +- 11 2 +- 8 1 7839 19 Jul 04 02:39 LAG2 20 0 6 5 +- 10 2 +- 6 1 7839 20 Jul 04 09:09 LAG2 9 0 3 2 +- 15 -1 +- 18 0 7839 20 Jul 04 11:17 LAG1 9 0 10 9 +- 15 -2 +- 14 2 7839 20 Jul 04 15:09 LAG1 4 0 4 8 +- 48 -7 +- 40 1 7839 20 Jul 04 21:35 LAG1 12 0 13 2 +- 26 -6 +- 13 0 7839 20 Jul 04 22:59 LAG2 14 0 5 -5 +- 13 0 +- 7 1 7839 21 Jul 04 01:21 LAG1 16 0 9 9 +- 10 -2 +- 10 1 7839 21 Jul 04 03:15 LAG2 13 0 9 -1 +- 14 8 +- 11 0 7839 21 Jul 04 07:11 LAG2 12 0 4 4 +- 12 0 +- 8 0 7839 21 Jul 04 13:35 LAG1 8 0 5 8 +- 23 -2 +- 10 1 7839 21 Jul 04 20:25 LAG1 14 0 8 6 +- 11 3 +- 8 1 7839 21 Jul 04 21:17 LAG2 2 0 6 0 +- 494 8 +- 573 0 7839 21 Jul 04 23:59 LAG1 6 0 8 9 +- 20 1 +- 26 1 7839 22 Jul 04 01:03 LAG2 7 0 11 0 +- 16 5 +- 7 1 7839 22 Jul 04 19:07 LAG1 6 0 10 9 +- 21 -2 +- 18 0 7839 22 Jul 04 22:27 LAG1 16 0 9 3 +- 10 -4 +- 5 1 7839 22 Jul 04 23:07 LAG2 15 0 3 -3 +- 11 0 +- 9 1 7839 23 Jul 04 03:21 LAG2 6 0 3 2 +- 57 4 +- 49 0 7839 23 Jul 04 07:25 LAG2 12 0 1 0 +- 12 0 +- 9 0 7839 23 Jul 04 21:03 LAG1 12 0 6 0 +- 13 -3 +- 6 1 7839 23 Jul 04 21:31 LAG2 12 0 1 -1 +- 15 0 +- 12 0 Station 7840 (Herstmonceux) (position fixed, acc. 20 mm) 7840 18 Jul 04 17:35 LAG1 13 0 11 0 +- 19 -6 +- 12 3 7840 18 Jul 04 20:59 LAG1 15 0 10 5 +- 17 -4 +- 10 1 7840 18 Jul 04 22:47 LAG2 16 0 5 -4 +- 16 -3 +- 16 1 7840 19 Jul 04 00:29 LAG1 21 0 5 -4 +- 14 1 +- 8 2 7840 19 Jul 04 02:37 LAG2 25 0 6 3 +- 13 2 +- 8 2 7840 19 Jul 04 06:45 LAG2 15 0 13 12 +- 21 0 +- 16 2 7840 19 Jul 04 20:01 LAG1 7 0 7 16 +- 84 -6 +- 51 1 7840 20 Jul 04 15:00 LAG1 8 0 12 6 +- 24 -9 +- 29 4 7840 21 Jul 04 20:27 LAG1 17 0 10 8 +- 16 1 +- 10 5 7840 21 Jul 04 23:55 LAG1 19 0 8 4 +- 15 2 +- 8 4 7840 22 Jul 04 00:57 LAG2 9 0 14 2 +- 62 9 +- 35 1 7840 22 Jul 04 05:03 LAG2 14 0 10 7 +- 17 6 +- 13 4 7840 22 Jul 04 22:38 LAG1 14 0 10 7 +- 19 -5 +- 11 5 7840 23 Jul 04 07:12 LAG2 20 0 4 1 +- 15 0 +- 10 4 7840 23 Jul 04 14:27 LAG1 5 0 20 19 +- 52 0 +- 61 2 7840 23 Jul 04 17:53 LAG1 10 0 10 7 +- 20 -5 +- 19 2 7840 23 Jul 04 21:09 LAG1 14 0 9 4 +- 21 -2 +- 12 5 7840 23 Jul 04 21:35 LAG2 6 0 2 -2 +- 28 0 +- 91 1 7840 24 Jul 04 00:41 LAG1 12 0 15 18 +- 28 3 +- 17 1 7840 24 Jul 04 01:09 LAG2 25 0 7 5 +- 13 1 +- 8 5 7840 24 Jul 04 05:33 LAG2 12 0 11 14 +- 24 -9 +- 19 2 7840 24 Jul 04 09:31 LAG2 10 0 7 -3 +- 21 -9 +- 32 3 7840 24 Jul 04 12:55 LAG1 8 0 19 19 +- 37 0 +- 28 3 7840 24 Jul 04 16:27 LAG1 6 0 6 21 +- 145 8 +- 73 3 7840 24 Jul 04 19:53 LAG1 14 0 12 12 +- 18 4 +- 12 1 Station 7841 (Potsdam) (position solved, acc. 10 mm) 7841 21 Jul 04 20:35 LAG1 4 0 3 -1 +- 26 3 +- 62 1 7841 22 Jul 04 19:11 LAG1 9 0 5 5 +- 14 -1 +- 16 1 7841 22 Jul 04 22:29 LAG1 20 0 10 0 +- 9 -5 +- 5 2 7841 22 Jul 04 23:13 LAG2 15 0 6 -6 +- 12 0 +- 10 2 7841 24 Jul 04 19:47 LAG1 20 0 6 1 +- 9 3 +- 5 4 7841 24 Jul 04 23:17 LAG1 11 0 5 -2 +- 17 -3 +- 11 3 7841 24 Jul 04 23:45 LAG2 8 0 5 0 +- 28 4 +- 28 2 Station 7941 (Matera) (position solved, acc. 10 mm) 7941 17 Jul 04 00:09 LAG1 4 0 63128 -18 +- 604 23638 +- 226 0*CHK* 7941 17 Jul 04 02:35 LAG2 10 0 24029 40 +- 21 23639 +- 21 3*CHK* 7941 17 Jul 04 06:43 LAG2 11 0 33195 5 +- 29 23622 +- 20 1*CHK* 7941 17 Jul 04 10:46 LAG2 10 0 20040 10 +- 21 23639 +- 25 1*CHK* 7941 17 Jul 04 18:56 LAG1 13 0 28855 2 +- 14 23632 +- 11 6*CHK* 7941 17 Jul 04 20:47 LAG2 13 0 16252 -31 +- 12 23619 +- 17 0*CHK* 7941 17 Jul 04 22:19 LAG1 11 0 25924 0 +- 12 23627 +- 11 1*CHK* 7941 18 Jul 04 00:31 LAG2 6 0 41841 4 +- 29 23634 +- 16 3*CHK* 7941 18 Jul 04 02:13 LAG1 4 0 29882 -13 +- 168 23645 +- 132 0*CHK* 7941 18 Jul 04 04:41 LAG2 12 0 26111 14 +- 16 23633 +- 14 1*CHK* 7941 18 Jul 04 08:59 LAG2 7 0 11 15 +- 35 5 +- 36 1 7941 18 Jul 04 10:39 LAG1 6 0 8 11 +- 24 20 +- 45 1 7941 18 Jul 04 14:01 LAG1 9 0 4 6 +- 49 1 +- 23 1 7941 18 Jul 04 17:29 LAG1 11 1 4 -4 +- 19 -4 +- 17 1 7941 18 Jul 04 20:57 LAG1 5 0 4 -9 +- 59 -8 +- 50 2 7941 18 Jul 04 22:41 LAG2 12 0 5 -1 +- 19 -4 +- 15 1 7941 19 Jul 04 00:23 LAG1 11 0 14 -16 +- 17 -2 +- 14 2 7941 19 Jul 04 06:55 LAG2 7 0 1 -1 +- 111 -1 +- 59 0 7941 19 Jul 04 11:13 LAG2 6 1 14 4 +- 84 11 +- 102 1 7941 19 Jul 04 12:41 LAG1 8 0 1862 1883 +- 56 11 +- 28 0*CHK* 7941 19 Jul 04 16:09 LAG1 10 0 12 -7 +- 29 3 +- 18 1 7941 19 Jul 04 19:49 LAG1 9 0 10 9 +- 28 1 +- 21 1 7941 19 Jul 04 20:55 LAG2 10 0 5 -6 +- 18 -3 +- 24 0 7941 19 Jul 04 23:04 LAG1 19 1 8 4 +- 12 -1 +- 6 7 7941 20 Jul 04 01:07 LAG2 10 0 9 -3 +- 24 10 +- 21 3 7941 20 Jul 04 04:55 LAG2 4 0 10 13 +- 41 11 +- 26 1 7941 20 Jul 04 09:03 LAG2 13 0 3 5 +- 20 2 +- 15 1 7941 20 Jul 04 11:21 LAG1 7 0 15 16 +- 51 0 +- 36 1 7941 20 Jul 04 18:17 LAG1 10 0 18 15 +- 17 -3 +- 17 1 7941 20 Jul 04 21:47 LAG1 11 0 16 3 +- 14 -10 +- 8 5 7941 20 Jul 04 22:59 LAG2 22 0 6 -5 +- 9 0 +- 6 1 7941 21 Jul 04 01:29 LAG1 11 0 4 8 +- 28 -4 +- 21 2 7941 21 Jul 04 03:15 LAG2 11 0 7 -1 +- 15 10 +- 18 0 7941 21 Jul 04 07:13 LAG2 6 0 2 2 +- 29 0 +- 24 1 7941 21 Jul 04 10:03 LAG1 2 0 6 -11 +- 300 -22 +- 369 0 7941 21 Jul 04 13:27 LAG1 8 0 5 10 +- 72 2 +- 32 3 7941 21 Jul 04 16:56 LAG1 7 1 4 11 +- 56 6 +- 40 2 7941 21 Jul 04 20:23 LAG1 12 0 4 3 +- 12 2 +- 11 1 7941 21 Jul 04 21:09 LAG2 12 0 5 -5 +- 12 0 +- 9 1 7941 21 Jul 04 23:41 LAG1 18 0 2 0 +- 10 0 +- 5 2 7941 22 Jul 04 00:57 LAG2 10 0 12 0 +- 13 5 +- 6 1 7941 22 Jul 04 05:07 LAG2 6 3 11 20 +-1422 14 +- 630 0 7941 22 Jul 04 09:15 LAG2 11 0 8 -1 +- 15 5 +- 11 2 7941 22 Jul 04 12:05 LAG1 9 3 9 7 +- 67 0 +- 41 1 7941 22 Jul 04 19:06 LAG1 11 0 7 4 +- 12 -5 +- 14 3 7941 22 Jul 04 22:56 LAG1 1 0 18 0 +- 0 0 +- 0 0 7941 22 Jul 04 23:37 LAG2 2 0 2 127 +-1505 -87 +-1046 0 7941 23 Jul 04 03:24 LAG2 7 1 11 10 +- 17 5 +- 18 3 7941 23 Jul 04 07:19 LAG2 15 0 3 0 +- 21 2 +- 13 1 7941 23 Jul 04 10:41 LAG1 10 1 8 0 +- 39 -5 +- 27 2 7941 23 Jul 04 14:13 LAG1 7 3 11 77 +- 344 26 +- 137 0 7941 23 Jul 04 17:49 LAG1 8 0 2 -2 +- 16 0 +- 22 1 7941 23 Jul 04 20:59 LAG1 7 0 6 11 +- 104 2 +- 45 2 7941 23 Jul 04 21:13 LAG2 9 0 3 0 +- 16 0 +- 8 3 7941 24 Jul 04 00:51 LAG1 9 0 14 17 +- 21 -4 +- 22 2 7941 24 Jul 04 01:13 LAG2 20 0 3 -2 +- 10 0 +- 6 1 7941 24 Jul 04 09:47 LAG2 10 0 8 -7 +- 18 7 +- 23 5 7941 24 Jul 04 12:49 LAG1 9 0 4 12 +- 65 5 +- 28 3 7941 24 Jul 04 16:25 LAG1 7 0 16 -15 +- 49 0 +- 33 1 7941 24 Jul 04 19:43 LAG1 14 0 6 6 +- 11 0 +- 7 2 Station 8834 (Wettzell) (position fixed, acc. 10 mm) 8834 17 Jul 04 00:00 LAG1 2 0 10 -20 +- 62 7 +- 30 0 8834 17 Jul 04 02:35 LAG2 19 0 12 -7 +- 9 6 +- 7 7 8834 17 Jul 04 06:45 LAG2 22 0 11 -4 +- 10 -4 +- 6 6 8834 17 Jul 04 10:39 LAG2 12 0 13 -7 +- 12 7 +- 11 2 8834 17 Jul 04 12:17 LAG1 8 0 3 9 +- 85 -4 +- 40 2 8834 17 Jul 04 15:31 LAG1 9 0 3 0 +- 14 0 +- 15 3 8834 18 Jul 04 00:59 LAG2 3 0 20 -23 +- 88 6 +- 146 0 8834 18 Jul 04 09:01 LAG2 9 0 16 3 +- 15 20 +- 26 8 8834 18 Jul 04 10:41 LAG1 9 0 12 -23 +- 26 21 +- 27 1 8834 18 Jul 04 14:02 LAG1 8 0 10 -6 +- 15 -2 +- 8 6 8834 18 Jul 04 17:39 LAG1 7 0 13 -14 +- 17 -4 +- 24 2 8834 18 Jul 04 21:03 LAG1 15 0 16 -14 +- 12 -1 +- 7 2 8834 18 Jul 04 22:53 LAG2 10 0 14 -13 +- 13 0 +- 13 4 8834 19 Jul 04 12:37 LAG1 17 0 14 -1 +- 10 8 +- 6 3 8834 19 Jul 04 16:15 LAG1 4 0 30 -12 +- 110 11 +- 72 1 8834 19 Jul 04 19:43 LAG1 13 0 8 -9 +- 14 4 +- 9 3 8834 19 Jul 04 23:10 LAG1 16 0 13 -11 +- 12 8 +- 7 3 8834 20 Jul 04 01:08 LAG2 15 0 13 -19 +- 21 14 +- 12 5 8834 20 Jul 04 09:05 LAG2 17 0 11 -5 +- 10 -2 +- 7 8 8834 20 Jul 04 11:15 LAG1 8 0 9 -8 +- 15 -2 +- 11 2 8834 20 Jul 04 14:55 LAG1 2 0 6 103 +- 515 56 +- 281 0 8834 21 Jul 04 01:21 LAG1 16 0 13 4 +- 10 -4 +- 9 11 8834 21 Jul 04 03:13 LAG2 13 0 11 -12 +- 16 5 +- 10 6 8834 21 Jul 04 07:01 LAG2 15 0 11 -8 +- 11 -3 +- 7 8 8834 21 Jul 04 09:49 LAG1 7 0 5 -7 +- 48 -6 +- 52 4 8834 21 Jul 04 11:19 LAG2 5 0 10 -11 +- 26 2 +- 49 1 8834 21 Jul 04 13:33 LAG1 13 0 11 -10 +- 12 0 +- 6 4 8834 21 Jul 04 20:33 LAG1 12 0 6 -8 +- 16 3 +- 10 2 8834 21 Jul 04 21:45 LAG2 2 0 16 524 +-2885 -326 +-1741 0 8834 21 Jul 04 23:52 LAG1 16 0 8 -4 +- 10 4 +- 6 3 8834 22 Jul 04 01:15 LAG2 8 0 17 -22 +- 20 5 +- 10 2 8834 22 Jul 04 09:07 LAG2 9 0 11 15 +- 51 15 +- 31 3 8834 22 Jul 04 12:18 LAG1 4 0 14 -12 +- 23 -2 +- 18 2 8834 22 Jul 04 15:47 LAG1 4 0 9 -13 +- 53 -6 +- 66 3 8834 22 Jul 04 19:11 LAG1 13 0 7 -4 +- 16 -1 +- 8 3 8834 22 Jul 04 22:51 LAG1 7 0 22 -39 +- 44 10 +- 22 5 8834 22 Jul 04 23:17 LAG2 12 0 26 -26 +- 12 3 +- 9 3 8834 23 Jul 04 02:21 LAG1 5 0 2 1 +- 19 -3 +- 76 2 8834 23 Jul 04 03:14 LAG2 7 0 21 -1 +- 39 13 +- 27 4 8834 23 Jul 04 07:15 LAG2 11 0 7 1 +- 30 3 +- 19 5 8834 23 Jul 04 14:17 LAG1 13 0 12 -11 +- 12 -5 +- 8 5 8834 23 Jul 04 18:00 LAG1 5 0 15 -16 +- 41 1 +- 44 5 8834 24 Jul 04 09:42 LAG2 1 0 9 0 +- 0 0 +- 0 0 -------------------------------------------------------------------------------- Distribution of daytime, nighttime and twilight passes since Jan 1, 2003: -------------------------------------------------------------------------- Station System Period Number of Passes LAGEOS-1 LAGEOS-2 Day/Night/Twil. Day/Night/Twil. Total -------------------------------------------------------------------------- 1824 KIEVLA 040314 - 040724 0/ 13/ 0 0/ 3/ 0 16 1863 MDNLAS 040103 - 040117 0/ 2/ 0 0/ 4/ 0 6 1864 MD2LAS 040102 - 040725 0/ 98/ 0 0/ 34/ 0 132 1868 KOMLAS 040315 - 040614 0/ 15/ 0 0/ 3/ 0 18 1873 SIMLAS 040118 - 040723 0/ 39/ 0 0/ 16/ 0 55 1884 RIGLAS 040310 - 040725 0/ 45/ 0 0/ 3/ 0 48 1893 CRMLAS 040331 - 040723 0/ 28/ 0 0/ 13/ 0 41 6405 TIGO 040103 - 040226 1/ 10/ 2 1/ 0/ 0 14 6810 ZIMLAT 040107 - 040621 93/161/ 22 116/ 79/ 8 479 7080 MLRS25 040104 - 040724 38/ 74/ 12 55/ 62/ 5 246 7090 ML0514 040101 - 040726 168/164/ 41 122/242/ 25 762 7105 ML0725 040104 - 040722 20/ 60/ 7 5/ 45/ 5 142 7110 ML0414 040102 - 040725 78/166/ 15 89/ 85/ 13 446 7124 ML0819 040315 - 040726 0/ 9/ 0 0/ 14/ 0 23 7210 HOLLAS 040105 - 040607 33/ 49/ 3 50/ 52/ 6 193 7231 WUHA01 040408 - 040701 0/ 0/ 0 0/ 2/ 0 2 7237 CHALAS 040101 - 040725 0/252/ 6 0/125/ 2 385 7249 BEJLAS 040101 - 040713 0/177/ 1 0/125/ 0 303 7308 CRLLAS 040106 - 040311 5/ 47/ 0 0/ 38/ 2 92 7355 TROS02 040509 - 040722 0/ 64/ 0 0/ 18/ 0 82 7405 TIGO 040103 - 040215 0/ 9/ 2 0/ 0/ 0 11 7501 ML0616 040106 - 040722 53/ 50/ 18 42/109/ 10 282 7806 METLAS 040720 - 040725 0/ 2/ 0 0/ 3/ 0 5 7810 ZIMLAT 040507 - 040726 83/ 64/ 17 89/ 10/ 8 271 7811 POLLAS 040105 - 040723 0/ 85/ 0 0/ 24/ 0 109 7823 FTLR** 040612 - 040626 0/ 9/ 0 1/ 1/ 1 12 7824 SPNLAS 040109 - 040721 0/ 88/ 0 0/ 52/ 1 141 7832 SALRO 040102 - 040726 82/206/ 23 149/161/ 24 645 7835 GRASSE 040301 - 040722 1/ 58/ 3 0/ 28/ 1 91 7836 GFZLAS 040105 - 040701 0/ 38/ 0 0/ 21/ 1 60 7837 CHILAS 040102 - 040726 0/ 39/ 0 0/ 37/ 0 76 7838 SHOLAS 040105 - 040723 20/162/ 2 42/110/ 7 343 7839 AUSLAS 040107 - 040726 46/126/ 17 51/ 69/ 7 316 7840 RGOLAS 040102 - 040724 87/177/ 33 98/ 81/ 14 490 7841 GFZLA3 040112 - 040725 14/ 59/ 11 13/ 24/ 5 126 7845 GRASLL 040318 - 040712 2/ 15/ 0 9/ 2/ 0 28 7941 MLROnn 040111 - 040725 100/140/ 22 101/102/ 9 474 8834 WLRS01 040108 - 040725 126/142/ 34 134/ 75/ 13 524 -------------------------------------------------------------------------- C. EARTH ROTATION PARAMETER SOLUTIONS FOR IERS The following solutions for the polar motion and the UT1-UTC time difference were also obtained in the 10-day data arc analysis described in the previous section. Only solutions submitted to IERS are presented here. -------------------------------------------------------------- DATE X Y UT1-UTC (YYMMDD.D) (MAS) (MAS) (MS) -------------------------------------------------------------- 040718.0 35.8 +/- 0.1 520.9 +/- 0.1 -32510.46 +/- 0.02 040719.0 38.8 +/- 0.1 521.1 +/- 0.1 -32509.62 +/- 0.02 040720.0 41.9 +/- 0.1 520.8 +/- 0.1 -32508.99 +/- 0.04 040721.0 44.3 +/- 0.1 520.4 +/- 0.1 -32508.66 +/- 0.05 040722.0 47.2 +/- 0.1 519.7 +/- 0.1 -32508.57 +/- 0.05 040723.0 50.1 +/- 0.1 519.7 +/- 0.1 -32508.68 +/- 0.06 040724.0 53.1 +/- 0.1 519.1 +/- 0.1 -32508.79 +/- 0.06 -------------------------------------------------------------- D. COMMENTS 1. The analysis covered in this report is based on a new set of station coordinates: instead of the solution SSC(DUT)93L05, which was extrapolated over some 10 years beyond the epoch of the latest observations, the current analysis relies on the ITRF2000 solution. Tests performed during the last year show that the rms-of-fit that can be obtained when using ITRF2000 can be reduced to about 2 cm (instead of the 3+ cm which was achieved with the old model, for present-day epochs). Other model modifications are to be expected. We hope to serve the community with this development. 2. As of July 1, a new computation model and analysis strategy are in use: in terms of geometric modeling, models for ocean loading and atmospheric pressure loading have been turned on. The frequency of the solutions for the Earth Orientation Parameters has been increased to once per day (rather than once per 3 days). As a consequence, the arc length has been changed from 10 days to 8 days. Also, the empirical accelerations acting on the spacecraft are estimated twice per arc (i.e. for 4-day periods). To absorb (unmodeled) geocenter motion, 3 coefficients of the gravity field model are estimated: C(1,0), C(1,1) and S(1,1). Finally, the overall weighting scheme for the individual SLR observations is also modified slightly. 3. As of the same date, provisions for handling the dual-wavelength systems 7405 and 7810 properly have been installed. This is done by introducing dummy station ids 6405 and 6810 for the observations taken on 2nd wavelength. The specific analysis results are easily recognizable because the wavelength has been added to the printout of the station name. 4. As of July 7, 2004, similar provisions for handling the dual-wavelength syste 7941 properly have been installed. This is done by introducing a dummy station id 6941 for the observations taken on 2nd wavelength. From: Ron Noomen ******************************************************************************** |