| Date: | 2004-08-10 07:15:00 | |
| Sender: | Ron Noomen <Ron Noomen <ron@astro.lr.tudelft.nl>> | |
| Subject: | [SLR-Report] No. 4182: Delft QL Report August 10, 2004 | |
| Author: | Ron Noomen | |
| Content: | ******************************************************************************** SLR Electronic Report 2004-08-10 07:15:00 UTC Message No. 4182 ******************************************************************************** Author: Ron Noomen Subject: Delft QL Report August 10, 2004 WEGENER-2 IERS REPORT OF THE QUICK-LOOK DATA ANALYSIS CENTER DELFT UNIVERSITY OF TECHNOLOGY FACULTY OF AEROSPACE ENGINEERING THE NETHERLANDS August 10, 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, Aug 9, 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, Aug 9, 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 ------------------------------------------------------------------------------ 1864 Maidanak, Uzbekistan (site 2) 040802 - 040808 5 6 1873 Simeiz, Crimea, Ukraine 040806 - 040808 3 2 1884 Riga, Latvia 040805 - 040805 1 - 1893 Kazivili, Crimea, Ukraine 040804 - 040808 2 1 6810 Zimmerwald 846, Switzerland 040805 - 040809 12 5 7080 McDonald Obs., Fort Davis, TX 040804 - 040805 2 1 7090 Yarragadee, Australia 040802 - 040809 18 16 7105 Greenbelt, Maryland 040804 - 040809 5 4 7110 Monument Peak, California 040802 - 040806 8 10 7124 Papeete, Tahiti 040803 - 040804 1 1 7231 Wuhan, China (new) 040807 - 040808 2 3 7237 Changchun, China 040802 - 040809 8 8 7355 Urumqi, China (TROS) 040806 - 040808 3 1 7501 Hartebeesthoek, SA (MOB-6) 040803 - 040808 - 14 7806 Metsahovi, Finland 040806 - 040806 1 - 7810 Zimmerwald 423, Switzerland 040802 - 040809 18 10 7811 Borowiec, Poland 040803 - 040806 5 5 7824 San Fernando, Spain 040803 - 040806 5 1 7825 040807 - 040808 2 3 7832 Riyad, Saudi Arabia 040802 - 040809 11 15 7837 Shanghai Observatory, China 040802 - 040809 10 14 7838 Simosato Observatory, Japan 040806 - 040808 3 3 7839 Graz, Austria 040801 - 040806 11 9 7840 Herstmonceux, United Kingdom 040803 - 040808 16 13 7841 Potsdam, Germany 040802 - 040809 13 14 7845 Grasse, France (LLR) 040804 - 040809 1 1 7941 Matera, Italy (MLRO 532) 040802 - 040802 - 1 8834 Wettzell, Germany 040802 - 040809 24 18 ------ ------ --- --- TOTAL 040801 - 040809 190 179 ------------------------------------------------------------------------------ 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 31, 2004 to Sun, Aug 8, 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 26 26 Number of Passes 192/188 175/169 Number of Normal Points 1810/1760 1946/1878 Weighted RMS of Fit (mm) 13 12 ----------------------------------------------------------------------- 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 1864 (Maidanak) (position fixed, acc. 200 mm) 1864 2 Aug 04 18:37 LAG2 5 0 26 -13 +- 277 10 +- 127 10 1864 3 Aug 04 20:01 LAG1 6 0 33 -29 +- 245 0 +- 158 15 1864 4 Aug 04 18:35 LAG1 2 0 39 391 +-9999 187 +-9999 0 1864 4 Aug 04 18:51 LAG2 5 0 52 -43 +- 276 15 +- 128 19 1864 4 Aug 04 23:19 LAG2 4 0 13 -9 +- 300 64 +-2131 1 1864 6 Aug 04 19:03 LAG2 2 0 75 -346 +-9999 -126 +-9999 0 1864 6 Aug 04 19:25 LAG1 3 0 46 -186 +-5247 -74 +-2749 0 1864 7 Aug 04 18:09 LAG1 6 0 33 -30 +- 246 5 +- 193 15 1864 7 Aug 04 21:15 LAG2 6 0 46 -33 +- 259 14 +- 181 14 Station 1873 (Simeiz) (position fixed, acc. 200 mm) 1873 6 Aug 04 19:03 LAG2 8 0 173 147 +- 262 -43 +- 305 24 1873 6 Aug 04 19:32 LAG1 4 0 231 253 +-1671 11 +- 794 26 1873 7 Aug 04 18:27 LAG1 5 0 232 251 +- 352 -45 +- 511 16 Station 1884 (Riga) (position fixed, acc. 100 mm) 1884 5 Aug 04 21:08 LAG1 9 0 20 -18 +- 116 -12 +- 116 12 Station 1893 (Kazivili) (position fixed, acc. 100 mm) 1893 4 Aug 04 18:51 LAG1 6 0 29 54 +- 327 23 +- 254 6 1893 6 Aug 04 19:15 LAG2 3 0 4 2 +- 227 -10 +-1037 3 Station 6810 (Zimmerwald 846) (position fixed, acc. 60 mm) 6810 5 Aug 04 14:31 LAG1 2 0 6 -5 +- 608 20 +-1085 0 6810 5 Aug 04 17:37 LAG1 13 0 6 0 +- 52 -4 +- 34 2 6810 6 Aug 04 16:21 LAG1 9 0 22 -11 +- 80 10 +- 59 2 6810 7 Aug 04 11:25 LAG1 17 0 5 1 +- 45 3 +- 31 3 6810 7 Aug 04 14:55 LAG1 14 0 14 -6 +- 62 5 +- 37 3 6810 7 Aug 04 18:27 LAG1 14 0 6 4 +- 49 0 +- 40 4 6810 7 Aug 04 21:01 LAG2 16 0 19 -18 +- 47 0 +- 33 1 6810 7 Aug 04 21:45 LAG1 15 0 27 -5 +- 49 -13 +- 24 6 Station 7080 (McDonald Obs.) (position fixed, acc. 20 mm) 7080 31 Jul 04 03:50 LAG2 4 0 34 48 +- 292 -9 +- 199 2 7080 31 Jul 04 05:34 LAG1 10 0 19 19 +- 22 0 +- 13 3 7080 1 Aug 04 04:25 LAG1 9 0 20 20 +- 23 0 +- 30 2 7080 4 Aug 04 16:19 LAG2 7 0 15 16 +- 37 2 +- 40 1 7080 4 Aug 04 19:48 LAG1 5 0 7 7 +- 64 0 +- 60 0 7080 5 Aug 04 18:21 LAG1 18 0 15 13 +- 15 -7 +- 11 3 Station 7090 (Yarragadee) (position fixed, acc. 10 mm) 7090 1 Aug 04 14:51 LAG1 9 0 8 -4 +- 18 6 +- 28 3 7090 1 Aug 04 18:19 LAG1 9 0 7 -2 +- 14 0 +- 5 6 7090 2 Aug 04 10:03 LAG2 15 0 15 -11 +- 10 4 +- 5 2 7090 2 Aug 04 14:15 LAG2 16 0 6 6 +- 10 0 +- 9 2 7090 2 Aug 04 16:54 LAG1 7 0 16 -10 +- 86 -12 +- 40 1 7090 2 Aug 04 20:39 LAG1 6 0 16 16 +- 19 -5 +- 38 3 7090 3 Aug 04 03:23 LAG1 6 0 39 -40 +- 49 0 +- 29 2 7090 3 Aug 04 08:35 LAG2 5 0 28 -25 +- 81 -3 +- 76 2 7090 3 Aug 04 12:19 LAG2 24 0 8 -7 +- 8 0 +- 5 1 7090 3 Aug 04 15:41 LAG1 16 0 6 -5 +- 11 0 +- 7 2 7090 3 Aug 04 19:09 LAG1 3 0 9 -17 +- 263 -14 +- 139 0 7090 4 Aug 04 10:17 LAG2 20 0 12 -9 +- 9 2 +- 5 4 7090 4 Aug 04 14:31 LAG2 18 0 3 -2 +- 10 3 +- 9 1 7090 4 Aug 04 17:39 LAG1 15 0 8 -7 +- 11 0 +- 5 2 7090 5 Aug 04 00:48 LAG1 4 0 17 -6 +- 101 -8 +- 78 5 7090 5 Aug 04 12:29 LAG2 23 0 18 -3 +- 8 -9 +- 4 2 7090 6 Aug 04 14:41 LAG2 12 0 5 -3 +- 12 1 +- 11 3 7090 6 Aug 04 15:15 LAG1 10 0 8 -11 +- 19 9 +- 20 2 7090 6 Aug 04 18:47 LAG1 14 0 3 -4 +- 18 0 +- 10 1 7090 6 Aug 04 22:01 LAG1 11 0 4 2 +- 12 -4 +- 17 2 7090 7 Aug 04 01:17 LAG1 8 0 6 0 +- 18 6 +- 23 1 7090 7 Aug 04 04:47 LAG2 6 0 21 -11 +- 71 -7 +- 53 2 7090 7 Aug 04 05:01 LAG1 2 0 25 -46 +- 471 17 +- 391 0 7090 7 Aug 04 08:35 LAG2 23 0 13 -3 +- 8 -8 +- 6 2 7090 7 Aug 04 12:41 LAG2 25 0 8 7 +- 8 -2 +- 5 1 7090 7 Aug 04 17:11 LAG1 23 0 12 -11 +- 9 -1 +- 4 2 7090 7 Aug 04 20:43 LAG1 15 0 13 4 +- 11 -12 +- 10 2 Station 7105 (Greenbelt) (position fixed, acc. 10 mm) 7105 4 Aug 04 03:53 LAG1 3 0 5 -16 +- 82 24 +- 128 1 7105 4 Aug 04 04:31 LAG2 8 0 11 33 +- 128 -19 +- 59 5 7105 4 Aug 04 08:23 LAG2 8 0 5 -2 +- 18 -5 +- 30 0 7105 6 Aug 04 00:55 LAG1 11 0 7 -8 +- 21 -4 +- 16 5 Station 7110 (Monument Peak) (position fixed, acc. 10 mm) 7110 31 Jul 04 02:28 LAG1 7 0 6 -5 +- 16 -7 +- 30 2 7110 31 Jul 04 05:37 LAG1 15 0 7 7 +- 10 0 +- 6 2 7110 31 Jul 04 07:11 LAG2 19 0 8 6 +- 10 2 +- 6 4 7110 31 Jul 04 09:09 LAG1 7 0 8 7 +- 16 0 +- 8 2 7110 31 Jul 04 11:25 LAG2 14 0 20 -20 +- 17 -27 +- 15 1 7110 2 Aug 04 11:57 LAG2 14 0 14 2 +- 13 -15 +- 12 2 7110 2 Aug 04 16:07 LAG2 3 0 6 -10 +- 117 -19 +- 139 1 7110 3 Aug 04 14:29 LAG2 4 0 16 -29 +- 163 10 +- 118 3 7110 3 Aug 04 21:14 LAG1 5 0 5 2 +- 19 -4 +- 20 3 7110 4 Aug 04 07:10 LAG1 9 0 12 4 +- 14 5 +- 6 2 7110 4 Aug 04 08:19 LAG2 2 0 9 348 +-1697 -194 +- 929 0 7110 4 Aug 04 12:10 LAG2 8 0 10 4 +- 16 -14 +- 32 2 7110 4 Aug 04 16:19 LAG2 9 0 6 5 +- 14 -3 +- 12 2 7110 4 Aug 04 20:09 LAG1 3 0 10 -64 +- 237 32 +- 137 1 7110 4 Aug 04 23:34 LAG1 1 0 17 0 +- 0 0 +- 0 0 7110 5 Aug 04 02:45 LAG1 8 0 5 6 +- 19 -4 +- 27 3 7110 5 Aug 04 05:47 LAG2 3 0 3 -32 +- 613 -16 +- 284 0 7110 5 Aug 04 06:01 LAG1 10 0 21 19 +- 15 1 +- 9 3 7110 5 Aug 04 09:41 LAG1 5 0 7 -5 +- 38 17 +- 60 3 7110 5 Aug 04 10:01 LAG2 3 0 30 -14 +- 354 -32 +- 257 0 7110 5 Aug 04 14:19 LAG2 12 0 10 -9 +- 13 -9 +- 13 2 7110 6 Aug 04 04:07 LAG2 11 0 4 -1 +- 12 -5 +- 18 1 7110 6 Aug 04 04:35 LAG1 4 0 6 6 +- 21 -1 +- 15 1 Station 7124 (Papeete) (position fixed, acc. 10 mm) 7124 31 Jul 04 08:53 LAG1 7 0 4 1 +- 41 -2 +- 40 2 7124 3 Aug 04 12:05 LAG1 3 0 26 -15 +- 75 -16 +- 112 0 7124 4 Aug 04 07:05 LAG2 5 0 15 11 +- 79 14 +- 46 5 Station 7231 (Wuhan) (position fixed, acc. 50 mm) 7231 7 Aug 04 13:27 LAG2 15 0 1209 1213 +- 43 -7 +- 35 14*CHK* 7231 7 Aug 04 14:25 LAG1 6 2 1270 1255 +- 222 16 +- 237 9*CHK* Station 7237 (Changchun) (position fixed, acc. 50 mm) 7237 31 Jul 04 13:18 LAG1 7 0 26 27 +- 59 4 +- 56 3 7237 31 Jul 04 14:43 LAG2 16 0 32 31 +- 38 -2 +- 27 5 7237 1 Aug 04 13:00 LAG2 11 0 11 8 +- 49 -4 +- 45 7 7237 1 Aug 04 15:31 LAG1 7 0 26 13 +- 58 19 +- 46 6 7237 1 Aug 04 16:57 LAG2 11 0 32 15 +- 46 -22 +- 42 11 7237 2 Aug 04 14:11 LAG1 6 0 24 22 +- 94 1 +- 109 10 7237 2 Aug 04 15:02 LAG2 8 0 39 38 +- 54 -2 +- 42 8 7237 4 Aug 04 11:41 LAG1 5 0 43 32 +- 150 13 +- 172 4 7237 4 Aug 04 14:48 LAG1 5 0 18 19 +- 138 11 +- 66 13 7237 4 Aug 04 15:41 LAG2 8 0 15 19 +- 343 -3 +- 172 7 7237 6 Aug 04 11:46 LAG2 6 0 20 0 +- 101 -16 +- 127 15 7237 6 Aug 04 12:11 LAG1 6 0 31 8 +- 64 20 +- 41 5 7237 6 Aug 04 15:47 LAG2 2 0 41 224 +-1416 -346 +-2638 0 7237 6 Aug 04 15:51 LAG1 4 0 31 37 +- 97 28 +- 201 4 Station 7355 (Urumqi) (position solved, acc. 10 mm) 7355 31 Jul 04 17:03 LAG1 13 1 19 -8 +- 13 15 +- 10 8 7355 31 Jul 04 18:39 LAG2 18 0 23 13 +- 10 -6 +- 8 20 7355 1 Aug 04 15:45 LAG1 11 0 48 17 +- 14 33 +- 12 10 7355 1 Aug 04 16:43 LAG2 16 0 38 29 +- 10 -13 +- 9 19 7355 1 Aug 04 19:16 LAG1 8 0 49 29 +- 14 47 +- 22 25 7355 1 Aug 04 20:57 LAG2 13 0 24 -16 +- 14 -4 +- 14 14 7355 6 Aug 04 16:07 LAG1 6 6 0 0 +- 0 0 +- 0 0 7355 6 Aug 04 19:17 LAG2 13 0 43 -52 +- 14 -26 +- 13 6 7355 6 Aug 04 19:43 LAG1 3 0 70 -148 +- 121 243 +- 146 31 Station 7501 (Hartebeesthoek) (position fixed, acc. 10 mm) 7501 3 Aug 04 07:49 LAG2 5 0 14 21 +- 89 -5 +- 65 1 7501 3 Aug 04 11:41 LAG2 5 0 10 -8 +- 52 -25 +- 90 6 7501 3 Aug 04 15:47 LAG2 17 0 12 9 +- 12 11 +- 9 1 7501 3 Aug 04 19:55 LAG2 20 0 3 0 +- 9 -1 +- 7 2 7501 4 Aug 04 14:03 LAG2 5 0 7 6 +- 20 18 +- 71 3 7501 4 Aug 04 17:55 LAG2 25 0 13 1 +- 8 7 +- 4 3 7501 5 Aug 04 12:09 LAG2 4 0 11 11 +- 85 0 +- 105 0 7501 5 Aug 04 16:15 LAG2 18 0 14 11 +- 12 2 +- 8 1 7501 5 Aug 04 20:15 LAG2 5 0 9 -12 +- 49 -5 +- 61 1 7501 6 Aug 04 18:09 LAG2 18 0 13 0 +- 9 6 +- 4 2 7501 7 Aug 04 16:13 LAG2 16 0 13 12 +- 10 2 +- 4 2 7501 7 Aug 04 20:25 LAG2 12 0 3 0 +- 12 2 +- 12 2 Station 7806 (Metsahovi) (position fixed, acc. 30 mm) 7806 6 Aug 04 19:59 LAG1 8 0 17 -13 +- 67 -2 +- 49 5 Station 7810 (Zimmerwald 423) (position fixed, acc. 60 mm) 7810 31 Jul 04 10:35 LAG1 2 0 15 -18 +- 173 -22 +- 626 0 7810 31 Jul 04 14:14 LAG1 1 0 13 0 +- 0 0 +- 0 0 7810 31 Jul 04 17:23 LAG1 15 0 10 8 +- 47 -4 +- 32 2 7810 31 Jul 04 20:47 LAG1 17 0 13 -12 +- 45 -4 +- 28 1 7810 31 Jul 04 22:05 LAG2 18 0 14 -12 +- 46 -2 +- 27 2 7810 1 Aug 04 00:17 LAG1 22 0 11 5 +- 39 -5 +- 24 3 7810 1 Aug 04 02:05 LAG2 26 0 9 -9 +- 35 0 +- 21 3 7810 1 Aug 04 06:13 LAG2 19 0 3 2 +- 44 0 +- 25 1 7810 1 Aug 04 12:31 LAG1 20 0 17 6 +- 41 7 +- 21 7 7810 1 Aug 04 16:05 LAG1 12 0 11 0 +- 71 7 +- 47 2 7810 1 Aug 04 19:29 LAG1 18 0 9 -3 +- 44 5 +- 26 2 7810 2 Aug 04 00:09 LAG2 28 0 6 -5 +- 34 1 +- 20 2 7810 2 Aug 04 04:21 LAG2 24 0 6 1 +- 37 -3 +- 24 3 7810 2 Aug 04 08:25 LAG2 13 0 7 -5 +- 53 2 +- 50 3 7810 2 Aug 04 11:09 LAG1 19 0 13 3 +- 42 8 +- 31 6 7810 2 Aug 04 14:51 LAG1 7 0 9 0 +- 112 -7 +- 93 1 7810 2 Aug 04 18:21 LAG1 13 0 12 12 +- 61 -10 +- 46 2 7810 2 Aug 04 21:33 LAG1 12 0 19 -3 +- 54 -10 +- 27 3 7810 2 Aug 04 22:29 LAG2 9 0 15 -15 +- 64 1 +- 54 3 7810 3 Aug 04 01:13 LAG1 17 0 5 0 +- 44 -3 +- 38 3 7810 3 Aug 04 02:18 LAG2 22 0 9 -6 +- 40 4 +- 26 3 7810 3 Aug 04 06:32 LAG2 15 0 5 -1 +- 57 -4 +- 46 3 7810 4 Aug 04 08:39 LAG2 14 0 12 -11 +- 49 0 +- 48 3 7810 4 Aug 04 11:59 LAG1 11 0 13 3 +- 108 10 +- 69 4 7810 5 Aug 04 06:55 LAG2 12 0 9 3 +- 53 -8 +- 50 3 7810 5 Aug 04 14:31 LAG1 2 0 2 9 +- 558 -18 +- 991 0 7810 5 Aug 04 17:40 LAG1 9 0 6 5 +- 72 -4 +- 53 3 7810 6 Aug 04 16:21 LAG1 11 0 20 -12 +- 71 8 +- 57 2 7810 7 Aug 04 11:25 LAG1 16 0 5 0 +- 48 2 +- 35 4 7810 7 Aug 04 14:55 LAG1 12 0 11 0 +- 71 6 +- 45 5 7810 7 Aug 04 18:27 LAG1 13 0 4 3 +- 51 0 +- 44 3 7810 7 Aug 04 21:01 LAG2 15 0 18 -18 +- 47 0 +- 36 2 7810 7 Aug 04 21:45 LAG1 16 0 30 -6 +- 46 -14 +- 22 6 Station 7811 (Borowiec) (position fixed, acc. 60 mm) 7811 31 Jul 04 00:11 LAG2 13 0 50 13 +- 50 34 +- 35 4 7811 3 Aug 04 23:58 LAG1 10 0 17 18 +- 60 -4 +- 75 3 7811 4 Aug 04 00:51 LAG2 10 0 18 19 +- 94 -1 +- 73 5 7811 4 Aug 04 22:29 LAG1 13 0 21 18 +- 51 -5 +- 43 4 7811 4 Aug 04 22:55 LAG2 10 0 15 14 +- 70 -1 +- 73 8 7811 5 Aug 04 21:00 LAG2 7 0 9 1 +- 71 2 +- 137 9 7811 5 Aug 04 21:15 LAG1 11 0 15 13 +- 73 -13 +- 53 6 7811 6 Aug 04 00:51 LAG2 18 0 16 13 +- 43 -5 +- 32 6 7811 6 Aug 04 19:46 LAG1 13 0 28 27 +- 51 0 +- 40 5 7811 6 Aug 04 23:01 LAG2 13 0 25 24 +- 50 3 +- 52 6 7811 6 Aug 04 23:27 LAG1 9 0 12 15 +- 80 -8 +- 75 5 Station 7824 (San Fernando) (position fixed, acc. 40 mm) 7824 31 Jul 04 00:22 LAG2 1 0 120 0 +- 0 0 +- 0 0 7824 31 Jul 04 01:45 LAG1 19 0 36 38 +- 30 -3 +- 21 4 7824 31 Jul 04 22:27 LAG2 6 0 14 36 +- 297 -15 +- 192 5 7824 3 Aug 04 20:24 LAG1 6 0 41 31 +- 102 -12 +- 110 4 7824 5 Aug 04 02:03 LAG1 4 0 51 59 +- 201 9 +- 228 3 7824 5 Aug 04 02:39 LAG2 8 0 45 48 +- 78 4 +- 96 2 7824 6 Aug 04 00:35 LAG1 14 0 46 50 +- 36 -8 +- 18 9 7824 6 Aug 04 20:07 LAG1 1 0 60 0 +- 0 0 +- 0 0 7824 6 Aug 04 23:17 LAG1 15 0 70 72 +- 34 -6 +- 22 8 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/ 2/ 0 15 1863 MDNLAS 040103 - 040117 0/ 2/ 0 0/ 4/ 0 6 1864 MD2LAS 040102 - 040808 0/108/ 0 0/ 44/ 0 152 1868 KOMLAS 040315 - 040614 0/ 15/ 0 0/ 3/ 0 18 1873 SIMLAS 040118 - 040808 0/ 35/ 0 0/ 15/ 0 50 1884 RIGLAS 040310 - 040805 0/ 49/ 0 0/ 4/ 0 53 1893 CRMLAS 040331 - 040808 0/ 32/ 0 0/ 15/ 0 47 6405 TIGO 040103 - 040226 1/ 10/ 2 1/ 0/ 0 14 6810 ZIMLAT 040107 - 040809 101/164/ 23 117/ 82/ 9 496 7080 MLRS25 040104 - 040805 41/ 76/ 12 58/ 63/ 5 255 7090 ML0514 040101 - 040809 178/185/ 41 130/259/ 26 819 7105 ML0725 040104 - 040809 20/ 65/ 8 5/ 49/ 5 152 7110 ML0414 040102 - 040806 84/176/ 17 100/ 98/ 13 488 7124 ML0819 040315 - 040804 0/ 13/ 0 0/ 15/ 0 28 7210 HOLLAS 040105 - 040607 33/ 49/ 3 50/ 52/ 6 193 7231 WUHA01 040408 - 040808 0/ 4/ 0 0/ 9/ 0 13 7237 CHALAS 040101 - 040809 0/263/ 6 0/136/ 2 407 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 - 040808 0/ 75/ 0 0/ 26/ 0 101 7405 TIGO 040103 - 040215 0/ 9/ 2 0/ 0/ 0 11 7501 ML0616 040106 - 040808 53/ 50/ 18 54/122/ 11 308 7806 METLAS 040720 - 040806 0/ 3/ 0 0/ 3/ 0 6 7810 ZIMLAT 040507 - 040809 107/ 77/ 19 102/ 24/ 9 338 7811 POLLAS 040105 - 040806 0/ 94/ 0 0/ 33/ 0 127 7823 FTLR** 040612 - 040626 0/ 9/ 0 1/ 1/ 1 12 7824 SPNLAS 040109 - 040806 0/ 96/ 0 0/ 57/ 1 154 7832 SALRO 040102 - 040809 84/221/ 23 160/181/ 24 693 7835 GRASSE 040301 - 040727 1/ 60/ 3 0/ 29/ 1 94 7836 GFZLAS 040105 - 040701 0/ 38/ 0 0/ 21/ 1 60 7837 CHILAS 040102 - 040809 0/ 49/ 0 0/ 53/ 1 103 7838 SHOLAS 040105 - 040808 21/167/ 2 44/117/ 7 358 7839 AUSLAS 040107 - 040806 53/136/ 19 55/ 81/ 9 353 7840 RGOLAS 040102 - 040808 104/193/ 35 105/ 95/ 15 547 7841 GFZLA3 040112 - 040809 16/ 75/ 14 14/ 39/ 10 168 7845 GRASLL 040318 - 040809 3/ 15/ 0 10/ 2/ 0 30 7941 MLROnn 040111 - 040802 102/141/ 22 102/102/ 9 478 8834 WLRS01 040108 - 040809 144/159/ 36 151/ 88/ 15 593 -------------------------------------------------------------------------- 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) -------------------------------------------------------------- 040801.0 72.4 +/- 0.1 516.3 +/- 0.2 -32506.44 +/- 0.02 040802.0 75.3 +/- 0.1 516.0 +/- 0.1 -32506.20 +/- 0.03 040803.0 78.3 +/- 0.1 515.5 +/- 0.1 -32506.30 +/- 0.04 040804.0 80.8 +/- 0.1 515.4 +/- 0.1 -32506.54 +/- 0.04 040805.0 83.6 +/- 0.1 515.6 +/- 0.1 -32506.89 +/- 0.05 040806.0 86.4 +/- 0.1 515.2 +/- 0.1 -32507.10 +/- 0.05 040807.0 88.3 +/- 0.1 515.7 +/- 0.1 -32507.26 +/- 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 ******************************************************************************** |