| Date: | 2005-01-18 13:15:00 | |
| Sender: | Ron Noomen <Ron Noomen <ron@astro.lr.tudelft.nl>> | |
| Subject: | [SLR-Report] No. 4816: Delft QL Report January 18, 2005 | |
| Author: | Ron Noomen | |
| Content: | ******************************************************************************** SLR Electronic Report 2005-01-18 13:15:00 UTC Message No. 4816 ******************************************************************************** Author: Ron Noomen Subject: Delft QL Report January 18, 2005 WEGENER-2 IERS REPORT OF THE QUICK-LOOK DATA ANALYSIS CENTER DELFT UNIVERSITY OF TECHNOLOGY FACULTY OF AEROSPACE ENGINEERING THE NETHERLANDS January 18, 2005 This is a daily 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 Tue, Jan 18, 2005. 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 Tue, Jan 18, 2005. 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 050118 - 050118 1 1 1831 Lviv, Ukraine 050117 - 050118 2 1 1864 Maidanak, Uzbekistan (site 2) 050117 - 050117 1 1 6810 Zimmerwald 846, Switzerland 050116 - 050117 7 5 7080 McDonald Obs., Fort Davis, TX 050117 - 050117 - 1 7090 Yarragadee, Australia 050116 - 050116 4 2 7810 Zimmerwald 423, Switzerland 050116 - 050117 7 5 7811 Borowiec, Poland 050118 - 050118 - 1 7825 Mount Stromlo, Australia 050116 - 050116 - 1 7832 Riyad, Saudi Arabia 050116 - 050118 5 5 7838 Simosato Observatory, Japan 050106 - 050113 4 3 7839 Graz, Austria 050114 - 050118 10 8 7840 Herstmonceux, United Kingdom 050117 - 050117 1 - 7841 Potsdam, Germany 050116 - 050117 2 2 8834 Wettzell, Germany 050116 - 050118 9 7 ------ ------ --- --- TOTAL 050106 - 050118 53 43 ------------------------------------------------------------------------------ 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 Mon, Jan 10, 2005 to Tue, Jan 18, 2005. 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 23 19 Number of Passes 210/209 158/158 Number of Normal Points 2460/2442 2085/2079 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 1824 (Kiev) (position solved, acc. 200 mm) 1824 12 Jan 05 02:55 LAG2 7 0 52 0 +- 236 0 +- 299 52 1824 12 Jan 05 04:14 LAG1 3 0 39 25 +-1300 -20 +-1073 39 Station 1831 (Lviv) (position fixed, acc. 400 mm) 1831 17 Jan 05 04:28 LAG1 6 0 182 96 +-1470 60 +-1015 10 Station 1864 (Maidanak) (position fixed, acc. 200 mm) 1864 10 Jan 05 13:37 LAG1 4 0 12 30 +-1051 -27 +-1057 8 1864 17 Jan 05 14:23 LAG1 6 0 53 -17 +- 250 32 +- 203 25 1864 17 Jan 05 23:37 LAG2 3 0 16 -106 +-3692 -73 +-2382 9 Station 1884 (Riga) (position fixed, acc. 100 mm) 1884 11 Jan 05 15:48 LAG1 17 0 27 24 +- 72 -7 +- 53 6 Station 6405 (Concepcion) (position solved, acc. 20 mm) 6405 10 Jan 05 00:53 LAG2 7 0 8 20 +- 127 11 +- 78 7 6405 10 Jan 05 01:29 LAG1 3 0 6 -8 +- 230 10 +- 174 0 6405 10 Jan 05 23:23 LAG2 7 0 11 -22 +- 96 7 +- 64 1 Station 6810 (Zimmerwald 846) (position fixed, acc. 60 mm) 6810 10 Jan 05 06:23 LAG2 13 0 18 -12 +- 50 6 +- 28 3 6810 10 Jan 05 06:40 LAG1 13 0 16 -20 +- 64 6 +- 29 2 6810 10 Jan 05 10:10 LAG1 19 0 14 -13 +- 41 3 +- 26 4 6810 10 Jan 05 10:23 LAG2 20 0 7 0 +- 42 4 +- 27 4 6810 10 Jan 05 13:39 LAG1 17 0 10 -10 +- 46 2 +- 25 2 6810 10 Jan 05 14:29 LAG2 17 0 16 -15 +- 44 -2 +- 31 3 6810 10 Jan 05 17:02 LAG1 24 0 15 -11 +- 37 -4 +- 21 4 6810 11 Jan 05 04:28 LAG2 11 0 11 -10 +- 112 0 +- 77 4 6810 11 Jan 05 05:17 LAG1 18 0 15 -5 +- 43 -6 +- 20 6 6810 11 Jan 05 08:27 LAG2 17 0 28 -23 +- 55 4 +- 35 4 6810 11 Jan 05 08:49 LAG1 13 0 29 -29 +- 50 0 +- 25 3 6810 12 Jan 05 03:12 LAG2 2 0 14 -135 +-3095 80 +-2031 0 6810 12 Jan 05 04:17 LAG1 3 0 15 8 +- 331 12 +- 530 2 6810 12 Jan 05 06:43 LAG2 5 0 18 -14 +- 93 2 +- 70 6 6810 12 Jan 05 10:37 LAG2 7 0 20 -7 +- 457 6 +- 221 2 6810 12 Jan 05 10:59 LAG1 7 0 39 -29 +- 100 8 +- 65 5 6810 13 Jan 05 16:27 LAG1 20 0 9 -1 +- 41 -4 +- 20 3 6810 14 Jan 05 02:53 LAG2 20 0 15 0 +- 40 -11 +- 33 4 6810 14 Jan 05 04:41 LAG1 17 0 14 16 +- 55 5 +- 34 4 6810 14 Jan 05 07:02 LAG2 9 0 7 -7 +- 63 1 +- 82 1 6810 14 Jan 05 08:15 LAG1 9 0 16 -10 +- 85 4 +- 57 2 6810 14 Jan 05 11:41 LAG1 17 0 31 -31 +- 45 0 +- 30 4 6810 14 Jan 05 15:05 LAG2 11 0 25 -24 +- 59 0 +- 52 3 6810 14 Jan 05 15:08 LAG1 13 0 10 -9 +- 51 2 +- 23 2 6810 14 Jan 05 18:50 LAG1 12 0 26 -27 +- 55 5 +- 60 3 6810 15 Jan 05 03:21 LAG1 4 0 38 -19 +- 103 20 +- 81 3 6810 15 Jan 05 04:53 LAG2 24 0 10 -10 +- 37 0 +- 21 2 6810 15 Jan 05 06:55 LAG1 18 0 7 -5 +- 43 -1 +- 20 3 6810 15 Jan 05 08:55 LAG2 25 0 14 -14 +- 36 0 +- 21 3 6810 15 Jan 05 10:23 LAG1 15 0 22 -22 +- 47 -1 +- 25 3 6810 15 Jan 05 13:01 LAG2 27 0 20 -17 +- 35 6 +- 21 4 6810 15 Jan 05 13:55 LAG1 15 0 14 -8 +- 49 -6 +- 30 3 6810 15 Jan 05 17:17 LAG1 12 0 13 -13 +- 55 0 +- 27 4 6810 16 Jan 05 03:03 LAG2 18 0 10 -9 +- 43 -3 +- 30 3 6810 16 Jan 05 05:29 LAG1 11 0 17 -12 +- 59 -2 +- 23 9 6810 16 Jan 05 06:59 LAG2 18 0 16 -13 +- 43 6 +- 29 2 6810 16 Jan 05 09:06 LAG1 16 0 10 -6 +- 45 -4 +- 31 3 6810 16 Jan 05 11:05 LAG2 25 0 11 -10 +- 36 1 +- 21 3 6810 16 Jan 05 12:29 LAG1 12 0 6 -8 +- 74 -3 +- 52 2 6810 16 Jan 05 15:13 LAG2 15 0 19 -17 +- 48 3 +- 55 2 6810 16 Jan 05 15:53 LAG1 25 0 10 -8 +- 36 2 +- 18 4 6810 17 Jan 05 04:07 LAG1 17 0 15 -7 +- 44 5 +- 26 8 6810 17 Jan 05 05:03 LAG2 22 0 16 -16 +- 39 0 +- 20 2 6810 17 Jan 05 07:43 LAG1 20 0 8 -4 +- 41 -3 +- 22 5 6810 17 Jan 05 09:19 LAG2 22 0 14 -12 +- 41 -1 +- 27 2 6810 17 Jan 05 11:13 LAG1 10 0 21 -15 +- 64 -5 +- 38 1 6810 17 Jan 05 13:36 LAG2 12 0 19 -11 +- 99 -5 +- 64 4 6810 17 Jan 05 14:37 LAG1 18 0 23 -22 +- 43 -2 +- 26 2 6810 17 Jan 05 18:13 LAG1 14 0 14 -14 +- 48 0 +- 42 2 Station 7080 (McDonald Obs.) (position fixed, acc. 20 mm) 7080 10 Jan 05 21:05 LAG1 12 0 28 28 +- 20 1 +- 19 2 7080 10 Jan 05 22:25 LAG2 15 0 24 -39 +- 34 12 +- 21 3 7080 11 Jan 05 00:41 LAG1 13 0 5 -4 +- 24 0 +- 16 2 7080 11 Jan 05 23:15 LAG1 13 0 3 2 +- 19 0 +- 14 2 7080 13 Jan 05 16:19 LAG2 14 0 10 -10 +- 21 2 +- 19 3 7080 13 Jan 05 20:27 LAG2 16 0 13 -3 +- 18 7 +- 10 3 7080 13 Jan 05 20:41 LAG1 3 0 27 28 +- 83 3 +- 187 3 7080 14 Jan 05 00:05 LAG1 12 0 7 -7 +- 27 0 +- 17 2 7080 14 Jan 05 10:29 LAG2 2 0 12 -2 +- 218 -18 +- 382 0 7080 15 Jan 05 02:24 LAG1 7 0 9 -9 +- 50 0 +- 59 2 7080 16 Jan 05 10:23 LAG2 14 0 15 7 +- 17 -9 +- 13 2 7080 17 Jan 05 08:53 LAG2 4 0 5 18 +- 141 -18 +- 176 1 Station 7090 (Yarragadee) (position fixed, acc. 10 mm) 7090 10 Jan 05 11:49 LAG2 18 0 11 -7 +- 14 -10 +- 10 5 7090 10 Jan 05 12:23 LAG1 10 0 18 1 +- 35 11 +- 19 2 7090 10 Jan 05 16:01 LAG1 5 0 23 -23 +- 29 0 +- 62 0 7090 10 Jan 05 16:09 LAG2 27 0 9 -6 +- 8 4 +- 5 2 7090 10 Jan 05 19:03 LAG1 11 0 18 -8 +- 12 8 +- 6 1 7090 10 Jan 05 20:19 LAG2 12 0 5 0 +- 20 -3 +- 14 1 7090 11 Jan 05 11:07 LAG1 12 0 13 -8 +- 12 -7 +- 8 3 7090 11 Jan 05 14:13 LAG2 13 0 5 -9 +- 19 -6 +- 19 0 7090 11 Jan 05 14:37 LAG1 9 0 10 -9 +- 14 -10 +- 22 0 7090 11 Jan 05 19:05 LAG2 5 0 1 -17 +- 319 6 +- 131 1 7090 11 Jan 05 21:07 LAG1 11 0 19 -17 +- 26 0 +- 14 5 7090 12 Jan 05 12:15 LAG2 13 0 18 4 +- 11 -15 +- 10 0 7090 12 Jan 05 13:43 LAG1 4 0 10 0 +- 277 4 +- 136 2 7090 12 Jan 05 16:25 LAG2 5 0 13 43 +- 300 26 +- 143 2 7090 12 Jan 05 19:56 LAG1 6 0 25 -5 +- 26 12 +- 10 0 7090 12 Jan 05 20:31 LAG2 23 0 7 3 +- 8 -4 +- 6 2 7090 13 Jan 05 10:45 LAG2 5 0 4 11 +- 162 -3 +- 88 1 7090 13 Jan 05 11:47 LAG1 14 0 9 8 +- 12 -1 +- 5 5 7090 13 Jan 05 14:27 LAG2 22 0 5 1 +- 9 -3 +- 7 2 7090 13 Jan 05 15:28 LAG1 4 0 11 -5 +- 29 -7 +- 35 3 7090 13 Jan 05 18:45 LAG1 3 0 6 -5 +- 24 11 +- 116 1 7090 13 Jan 05 19:13 LAG2 7 0 14 0 +- 95 -5 +- 40 3 7090 13 Jan 05 22:11 LAG1 9 0 14 -15 +- 17 2 +- 16 3 7090 14 Jan 05 08:37 LAG2 9 0 16 -16 +- 22 0 +- 20 5 7090 14 Jan 05 10:29 LAG1 11 0 4 -9 +- 27 -5 +- 15 2 7090 14 Jan 05 12:25 LAG2 21 0 8 2 +- 9 -6 +- 8 0 7090 14 Jan 05 14:13 LAG1 9 0 4 -6 +- 24 3 +- 23 0 7090 14 Jan 05 16:37 LAG2 28 0 5 -3 +- 7 1 +- 4 4 7090 14 Jan 05 17:31 LAG1 8 0 3 -6 +- 34 3 +- 29 0 7090 14 Jan 05 20:29 LAG1 7 0 42 -17 +- 144 9 +- 54 2 7090 14 Jan 05 21:05 LAG2 10 0 8 13 +- 22 -6 +- 23 1 7090 15 Jan 05 09:37 LAG1 5 0 26 -34 +- 139 3 +- 72 3 7090 15 Jan 05 10:27 LAG2 17 0 12 0 +- 10 -4 +- 7 9 7090 15 Jan 05 12:43 LAG1 18 0 18 18 +- 10 -2 +- 6 4 7090 15 Jan 05 14:49 LAG2 19 0 9 -3 +- 10 8 +- 8 1 7090 15 Jan 05 18:45 LAG2 15 0 14 4 +- 28 9 +- 14 1 7090 15 Jan 05 19:33 LAG1 12 0 12 -26 +- 25 14 +- 14 1 7090 15 Jan 05 22:45 LAG1 17 0 13 -8 +- 10 6 +- 7 2 7090 16 Jan 05 11:35 LAG1 15 0 7 5 +- 20 -5 +- 10 3 7090 16 Jan 05 12:39 LAG2 18 0 8 0 +- 10 -7 +- 9 1 7090 16 Jan 05 14:51 LAG1 11 0 9 -9 +- 13 0 +- 17 0 7090 16 Jan 05 16:57 LAG2 21 0 3 -2 +- 9 0 +- 5 1 7090 16 Jan 05 17:59 LAG1 17 0 11 -8 +- 10 6 +- 7 1 7090 16 Jan 05 21:41 LAG1 5 0 15 -7 +- 27 13 +- 19 4 Station 7105 (Greenbelt) (position fixed, acc. 10 mm) 7105 15 Jan 05 08:25 LAG2 10 0 3 -4 +- 37 -3 +- 25 2 Station 7237 (Changchun) (position fixed, acc. 50 mm) 7237 14 Jan 05 20:05 LAG1 4 0 13 3 +- 119 -24 +- 312 4 7237 14 Jan 05 21:47 LAG2 5 0 9 -5 +- 70 4 +- 98 7 Station 7249 (Beijing) (position solved, acc. 50 mm) 7249 14 Jan 05 11:21 LAG1 7 0 11 6 +- 61 -4 +- 80 9 7249 14 Jan 05 20:03 LAG1 12 0 10 0 +- 44 9 +- 58 7 7249 14 Jan 05 21:27 LAG2 16 0 22 -17 +- 38 -7 +- 24 8 7249 15 Jan 05 10:07 LAG1 9 0 15 6 +- 130 3 +- 84 9 7249 15 Jan 05 19:33 LAG2 18 0 22 13 +- 36 7 +- 25 11 7249 15 Jan 05 22:05 LAG1 16 0 7 -1 +- 48 0 +- 28 7 Station 7308 (Tokyo) (position fixed, acc. 50 mm) 7308 11 Jan 05 08:13 LAG1 16 0 19 0 +- 50 -11 +- 28 4 Station 7405 (Concepcion) (position solved, acc. 20 mm) 7405 10 Jan 05 01:19 LAG1 4 0 5 -1 +- 36 1 +- 97 5 7405 10 Jan 05 04:37 LAG1 4 0 11 -5 +- 81 -26 +- 129 0 7405 10 Jan 05 23:26 LAG2 4 0 5 -10 +- 215 10 +- 132 0 7405 11 Jan 05 07:17 LAG2 2 0 10 -86 +-4387 -33 +-1911 0 7405 14 Jan 05 06:03 LAG2 2 0 14 23 +- 583 -9 +- 592 0 Station 7810 (Zimmerwald 423) (position fixed, acc. 60 mm) 7810 10 Jan 05 06:23 LAG2 14 0 10 0 +- 48 5 +- 26 2 7810 10 Jan 05 06:40 LAG1 12 0 11 -8 +- 64 6 +- 30 2 7810 10 Jan 05 10:11 LAG1 18 0 5 -3 +- 43 1 +- 28 2 7810 10 Jan 05 10:23 LAG2 21 0 12 11 +- 40 2 +- 26 3 7810 10 Jan 05 13:39 LAG1 16 0 5 0 +- 46 2 +- 27 2 7810 10 Jan 05 14:29 LAG2 16 0 5 -3 +- 45 -2 +- 33 2 7810 10 Jan 05 17:03 LAG1 23 0 10 -2 +- 38 -5 +- 22 4 7810 11 Jan 05 04:27 LAG2 12 0 3 -1 +- 109 -2 +- 71 2 7810 11 Jan 05 05:17 LAG1 18 0 16 9 +- 43 -6 +- 20 4 7810 11 Jan 05 08:27 LAG2 16 0 12 -5 +- 67 5 +- 44 3 7810 11 Jan 05 08:49 LAG1 12 0 14 -13 +- 53 1 +- 27 2 7810 12 Jan 05 03:13 LAG2 1 0 7 0 +- 0 0 +- 0 0 7810 12 Jan 05 04:17 LAG1 4 0 29 30 +- 248 0 +- 329 1 7810 12 Jan 05 07:01 LAG2 2 0 9 10 +- 460 -1 +- 369 0 7810 12 Jan 05 10:37 LAG2 7 0 5 -15 +- 462 -5 +- 223 2 7810 12 Jan 05 10:59 LAG1 6 0 27 -14 +- 99 10 +- 66 3 7810 13 Jan 05 16:27 LAG1 18 0 10 3 +- 44 -3 +- 21 5 7810 14 Jan 05 02:53 LAG2 19 0 15 8 +- 41 -9 +- 35 4 7810 14 Jan 05 04:41 LAG1 16 0 20 24 +- 61 6 +- 38 6 7810 14 Jan 05 07:01 LAG2 10 0 5 -2 +- 58 3 +- 71 3 7810 14 Jan 05 08:15 LAG1 8 0 9 -3 +- 106 3 +- 66 1 7810 14 Jan 05 11:51 LAG1 16 0 17 -16 +- 52 0 +- 35 2 7810 14 Jan 05 15:05 LAG2 10 0 12 -12 +- 59 0 +- 57 1 7810 14 Jan 05 15:08 LAG1 14 0 6 0 +- 50 2 +- 22 3 7810 14 Jan 05 18:51 LAG1 11 0 16 -16 +- 56 4 +- 65 3 7810 15 Jan 05 03:21 LAG1 3 0 34 -8 +- 144 20 +- 101 0 7810 15 Jan 05 04:52 LAG2 21 0 5 3 +- 40 -2 +- 24 3 7810 15 Jan 05 06:55 LAG1 17 0 9 9 +- 44 0 +- 22 2 7810 15 Jan 05 08:55 LAG2 26 0 4 -2 +- 36 0 +- 21 3 7810 15 Jan 05 10:23 LAG1 14 0 11 -10 +- 49 0 +- 27 4 7810 15 Jan 05 13:01 LAG2 25 0 12 1 +- 36 7 +- 23 5 7810 15 Jan 05 13:55 LAG1 14 0 8 4 +- 49 -5 +- 33 2 7810 15 Jan 05 17:18 LAG1 9 0 5 0 +- 69 0 +- 35 4 7810 16 Jan 05 03:05 LAG2 19 0 6 5 +- 42 -1 +- 29 3 7810 16 Jan 05 05:29 LAG1 7 0 5 0 +- 69 0 +- 27 4 7810 16 Jan 05 06:59 LAG2 18 0 8 -4 +- 44 4 +- 28 4 7810 16 Jan 05 09:06 LAG1 14 0 6 2 +- 49 -3 +- 35 3 7810 16 Jan 05 11:06 LAG2 25 0 3 0 +- 36 0 +- 21 2 7810 16 Jan 05 12:29 LAG1 12 0 7 0 +- 74 -4 +- 52 2 7810 16 Jan 05 15:12 LAG2 14 0 4 0 +- 52 4 +- 61 3 7810 16 Jan 05 15:53 LAG1 24 0 7 0 +- 37 3 +- 19 3 7810 17 Jan 05 04:08 LAG1 15 0 11 7 +- 47 4 +- 30 6 7810 17 Jan 05 05:11 LAG2 17 0 3 0 +- 44 0 +- 25 3 7810 17 Jan 05 07:43 LAG1 21 0 10 4 +- 39 -3 +- 21 5 7810 17 Jan 05 09:19 LAG2 23 0 6 -2 +- 41 -2 +- 26 3 7810 17 Jan 05 11:13 LAG1 11 0 13 -4 +- 64 -5 +- 36 2 7810 17 Jan 05 13:37 LAG2 11 0 6 10 +- 101 -6 +- 69 2 7810 17 Jan 05 14:37 LAG1 18 0 9 -6 +- 43 -2 +- 25 5 7810 17 Jan 05 18:13 LAG1 15 0 4 -1 +- 47 0 +- 39 4 Station 7811 (Borowiec) (position fixed, acc. 60 mm) 7811 11 Jan 05 04:43 LAG2 8 0 17 17 +- 65 -4 +- 59 3 7811 11 Jan 05 05:19 LAG1 9 0 39 21 +- 113 -13 +- 80 3 7811 13 Jan 05 05:08 LAG2 7 0 20 19 +- 157 0 +- 133 1 Station 7825 (Mount Stromlo) (position solved, acc. 10 mm) 7825 10 Jan 05 08:47 LAG2 4 0 9 59 +- 538 -21 +- 231 2 7825 10 Jan 05 08:57 LAG1 15 0 9 9 +- 15 0 +- 8 2 7825 10 Jan 05 12:19 LAG2 9 0 11 -2 +- 14 -4 +- 8 6 7825 10 Jan 05 12:23 LAG1 2 0 5 17 +- 159 47 +- 340 0 7825 10 Jan 05 18:49 LAG1 12 0 8 -12 +- 21 -5 +- 10 4 7825 11 Jan 05 06:09 LAG2 22 0 17 -8 +- 8 11 +- 6 2 7825 11 Jan 05 07:23 LAG1 13 0 16 -13 +- 11 -9 +- 9 2 7825 11 Jan 05 10:11 LAG2 17 0 10 7 +- 10 -3 +- 6 3 7825 11 Jan 05 11:00 LAG1 13 0 13 -3 +- 15 -7 +- 10 3 7825 11 Jan 05 14:17 LAG1 11 0 16 -7 +- 12 -13 +- 12 2 7825 11 Jan 05 14:27 LAG2 21 0 12 -9 +- 9 -2 +- 6 3 7825 11 Jan 05 17:29 LAG1 5 0 22 -13 +- 258 -13 +- 100 4 7825 11 Jan 05 18:33 LAG2 14 0 17 -5 +- 11 12 +- 8 2 7825 12 Jan 05 06:00 LAG1 16 0 21 -15 +- 10 -8 +- 10 9 7825 12 Jan 05 08:29 LAG2 14 0 22 20 +- 13 0 +- 7 5 7825 12 Jan 05 09:33 LAG1 19 0 21 18 +- 9 4 +- 5 3 7825 12 Jan 05 12:27 LAG2 17 0 13 0 +- 12 -9 +- 9 3 7825 12 Jan 05 13:05 LAG1 11 0 4 0 +- 13 4 +- 15 2 7825 12 Jan 05 16:13 LAG1 10 0 10 -5 +- 13 -4 +- 8 4 7825 12 Jan 05 16:36 LAG2 23 0 15 -5 +- 8 8 +- 5 3 7825 12 Jan 05 19:39 LAG1 21 0 10 -9 +- 9 0 +- 4 4 7825 13 Jan 05 06:19 LAG2 19 2 22 15 +- 10 8 +- 5 6 7825 13 Jan 05 08:05 LAG1 13 0 7 5 +- 11 0 +- 6 4 7825 13 Jan 05 10:25 LAG2 28 0 13 0 +- 7 -8 +- 5 5 7825 13 Jan 05 11:41 LAG1 11 0 10 -4 +- 12 5 +- 9 6 7825 13 Jan 05 14:43 LAG2 16 0 8 1 +- 10 -3 +- 5 4 7825 13 Jan 05 14:59 LAG1 13 0 14 0 +- 11 -10 +- 8 2 7825 13 Jan 05 18:15 LAG1 14 0 18 -9 +- 11 -7 +- 5 8 7825 13 Jan 05 18:52 LAG2 13 0 4 0 +- 11 1 +- 13 4 7825 14 Jan 05 06:45 LAG1 3 0 30 32 +- 584 1 +- 272 3 7825 14 Jan 05 08:27 LAG2 9 0 14 15 +- 16 4 +- 16 4 7825 14 Jan 05 10:17 LAG1 14 0 14 13 +- 11 -1 +- 7 5 7825 14 Jan 05 12:57 LAG2 17 0 7 -4 +- 10 -2 +- 8 1 7825 14 Jan 05 13:51 LAG1 10 0 15 -15 +- 15 1 +- 18 1 7825 14 Jan 05 16:49 LAG2 11 0 10 0 +- 12 5 +- 7 4 7825 14 Jan 05 16:57 LAG1 10 0 8 2 +- 13 1 +- 6 7 7825 14 Jan 05 20:32 LAG1 15 0 14 -14 +- 11 5 +- 8 3 7825 15 Jan 05 06:49 LAG2 17 0 11 6 +- 11 3 +- 9 4 7825 15 Jan 05 08:57 LAG1 9 0 7 3 +- 40 -1 +- 21 2 7825 15 Jan 05 19:06 LAG1 13 0 13 -11 +- 13 2 +- 6 8 7825 15 Jan 05 19:09 LAG2 10 0 7 6 +- 13 7 +- 25 2 7825 16 Jan 05 13:39 LAG2 2 0 6 105 +- 784 -56 +- 439 0 Station 7832 (Riyad) (position solved, acc. 20 mm) 7832 11 Jan 05 00:29 LAG2 7 0 26 -28 +- 136 -29 +- 76 2 7832 11 Jan 05 01:49 LAG1 9 0 5 -11 +- 74 -3 +- 40 2 7832 11 Jan 05 04:39 LAG2 13 0 5 -5 +- 19 -4 +- 22 1 7832 11 Jan 05 05:33 LAG1 11 0 9 10 +- 24 -5 +- 22 2 7832 11 Jan 05 08:59 LAG2 7 0 13 -7 +- 99 5 +- 81 0 7832 11 Jan 05 11:51 LAG1 7 0 24 -69 +- 132 -44 +- 67 10 7832 11 Jan 05 13:21 LAG2 7 0 31 -26 +- 35 -10 +- 57 1 7832 11 Jan 05 15:27 LAG1 7 0 27 -33 +- 65 -5 +- 52 1 7832 12 Jan 05 00:33 LAG1 7 0 19 -6 +- 59 14 +- 64 4 7832 12 Jan 05 02:35 LAG2 7 0 7 -2 +- 150 -4 +- 75 2 7832 12 Jan 05 04:03 LAG1 14 0 18 16 +- 17 3 +- 10 4 7832 12 Jan 05 07:13 LAG2 8 0 13 -14 +- 40 33 +- 61 3 7832 12 Jan 05 11:31 LAG2 7 0 11 -17 +- 58 8 +- 55 2 7832 12 Jan 05 14:17 LAG1 10 0 16 -26 +- 34 15 +- 24 2 7832 15 Jan 05 00:57 LAG2 9 0 13 -18 +- 64 -18 +- 39 2 7832 15 Jan 05 03:42 LAG1 11 0 15 6 +- 32 5 +- 20 3 7832 15 Jan 05 05:11 LAG2 14 0 6 5 +- 17 3 +- 23 2 7832 15 Jan 05 23:11 LAG2 9 0 9 11 +- 32 5 +- 40 2 7832 16 Jan 05 02:05 LAG1 7 0 4 -7 +- 113 -1 +- 57 2 7832 16 Jan 05 05:47 LAG1 11 0 14 17 +- 27 -4 +- 25 2 7832 16 Jan 05 07:41 LAG2 10 0 8 -6 +- 24 15 +- 40 2 7832 16 Jan 05 11:41 LAG2 7 0 7 -7 +- 76 0 +- 59 3 7832 16 Jan 05 12:11 LAG1 9 0 3 1 +- 33 0 +- 29 2 7832 16 Jan 05 15:41 LAG1 5 0 28 -25 +- 130 2 +- 97 2 7832 17 Jan 05 00:47 LAG1 4 0 9 18 +- 262 7 +- 192 4 7832 17 Jan 05 01:12 LAG2 4 0 13 24 +- 285 6 +- 151 1 7832 17 Jan 05 14:43 LAG1 7 0 9 -43 +- 163 17 +- 73 3 7832 17 Jan 05 23:27 LAG2 5 0 7 -17 +- 81 -14 +- 94 1 Station 7835 (Grasse) (position fixed, acc. 30 mm) 7835 12 Jan 05 17:53 LAG1 11 0 8 7 +- 56 -1 +- 40 1 7835 13 Jan 05 16:35 LAG1 10 0 21 18 +- 39 -3 +- 33 2 7835 14 Jan 05 04:41 LAG1 16 0 20 26 +- 37 4 +- 22 3 Station 7837 (Shanghai Observatory) (position fixed, acc. 50 mm) 7837 11 Jan 05 20:52 LAG1 7 0 14 -15 +- 94 4 +- 97 7 Station 7838 (Simosato Observatory) (position fixed, acc. 30 mm) 7838 11 Jan 05 19:07 LAG2 25 0 46 40 +- 19 10 +- 11 4 7838 12 Jan 05 10:25 LAG1 11 0 40 33 +- 31 2 +- 45 22 7838 12 Jan 05 17:23 LAG2 16 0 59 59 +- 24 7 +- 26 4 7838 12 Jan 05 19:07 LAG1 20 0 41 41 +- 21 -4 +- 15 5 7838 13 Jan 05 09:09 LAG1 11 0 50 35 +- 59 10 +- 36 7 7838 13 Jan 05 19:19 LAG2 20 0 44 42 +- 22 3 +- 12 9 Station 7839 (Graz) (position fixed, acc. 10 mm) 7839 10 Jan 05 06:15 LAG2 8 0 15 -5 +- 72 4 +- 33 0 7839 10 Jan 05 07:01 LAG1 12 0 10 -23 +- 29 11 +- 14 2 7839 10 Jan 05 10:09 LAG1 13 0 2 1 +- 13 1 +- 10 2 7839 10 Jan 05 10:29 LAG2 15 0 6 6 +- 11 0 +- 6 2 7839 10 Jan 05 13:31 LAG1 21 0 8 0 +- 9 4 +- 4 2 7839 10 Jan 05 14:29 LAG2 10 0 11 -8 +- 13 -5 +- 11 4 7839 10 Jan 05 17:05 LAG1 16 0 12 -2 +- 10 -6 +- 5 4 7839 11 Jan 05 00:59 LAG2 5 0 23 -15 +- 26 -23 +- 63 1 7839 11 Jan 05 01:35 LAG1 21 0 17 -10 +- 9 15 +- 10 4 7839 11 Jan 05 04:23 LAG2 20 0 3 -1 +- 11 -1 +- 6 2 7839 11 Jan 05 05:27 LAG1 14 0 11 5 +- 11 -7 +- 7 1 7839 11 Jan 05 08:28 LAG2 7 0 11 3 +- 153 6 +- 69 0 7839 11 Jan 05 12:21 LAG1 12 0 5 2 +- 12 2 +- 8 0 7839 11 Jan 05 12:41 LAG2 18 0 18 0 +- 10 -9 +- 5 1 7839 11 Jan 05 15:39 LAG1 17 0 5 0 +- 10 -2 +- 5 1 7839 11 Jan 05 19:37 LAG1 8 0 15 -12 +- 15 -16 +- 47 0 7839 12 Jan 05 02:41 LAG2 15 0 5 4 +- 10 -3 +- 7 0 7839 12 Jan 05 03:51 LAG1 26 0 17 12 +- 8 5 +- 4 5 7839 12 Jan 05 06:29 LAG2 22 0 10 -1 +- 9 5 +- 5 1 7839 12 Jan 05 07:57 LAG1 6 0 27 -25 +- 90 20 +- 36 1 7839 12 Jan 05 14:21 LAG1 18 0 6 -2 +- 10 3 +- 4 1 7839 12 Jan 05 14:49 LAG2 9 0 2 -1 +- 15 0 +- 15 1 7839 12 Jan 05 17:55 LAG1 11 0 3 -3 +- 17 -1 +- 14 2 7839 13 Jan 05 02:31 LAG1 17 0 21 0 +- 10 22 +- 10 3 7839 13 Jan 05 16:33 LAG1 10 0 8 0 +- 13 -3 +- 6 3 7839 14 Jan 05 01:19 LAG1 4 0 20 -33 +- 34 109 +- 152 1 7839 14 Jan 05 08:14 LAG1 10 0 6 -3 +- 13 2 +- 7 2 7839 14 Jan 05 10:59 LAG2 19 0 9 1 +- 9 -5 +- 5 2 7839 14 Jan 05 11:43 LAG1 11 0 5 -4 +- 12 0 +- 10 3 7839 14 Jan 05 15:05 LAG1 15 0 12 1 +- 11 5 +- 5 1 7839 14 Jan 05 15:09 LAG2 6 0 12 -12 +- 17 -1 +- 26 2 7839 14 Jan 05 18:59 LAG1 7 0 11 -12 +- 18 9 +- 32 2 7839 16 Jan 05 01:57 LAG1 12 0 22 -17 +- 14 10 +- 20 1 7839 16 Jan 05 03:03 LAG2 14 0 2 2 +- 13 0 +- 7 1 7839 17 Jan 05 01:17 LAG2 17 0 8 -1 +- 10 -5 +- 7 3 7839 17 Jan 05 04:01 LAG1 23 0 9 4 +- 8 2 +- 4 6 7839 17 Jan 05 05:03 LAG2 17 0 4 1 +- 10 1 +- 4 2 7839 17 Jan 05 07:51 LAG1 15 0 11 11 +- 12 -5 +- 7 2 7839 17 Jan 05 09:19 LAG2 13 0 5 -1 +- 12 -2 +- 7 1 7839 17 Jan 05 11:07 LAG1 11 0 9 0 +- 12 -4 +- 6 1 7839 17 Jan 05 13:16 LAG2 3 0 20 13 +- 35 -6 +- 26 0 7839 17 Jan 05 14:33 LAG1 20 0 5 -5 +- 9 0 +- 5 2 7839 17 Jan 05 18:17 LAG1 14 0 2 -2 +- 12 0 +- 12 1 Station 7840 (Herstmonceux) (position fixed, acc. 20 mm) 7840 12 Jan 05 06:39 LAG2 16 0 13 4 +- 16 7 +- 10 2 7840 12 Jan 05 07:41 LAG1 10 0 9 0 +- 20 9 +- 20 2 7840 12 Jan 05 10:41 LAG2 17 0 6 0 +- 16 4 +- 10 2 7840 12 Jan 05 11:05 LAG1 11 0 16 -12 +- 20 8 +- 12 2 7840 12 Jan 05 14:59 LAG2 8 0 2 -1 +- 39 2 +- 45 2 7840 12 Jan 05 17:59 LAG1 19 0 3 2 +- 15 -1 +- 10 2 7840 13 Jan 05 06:07 LAG1 15 0 24 23 +- 18 0 +- 11 5 7840 13 Jan 05 08:43 LAG2 10 0 8 11 +- 52 2 +- 33 1 7840 13 Jan 05 09:45 LAG1 13 0 7 -4 +- 19 -2 +- 12 2 7840 13 Jan 05 12:47 LAG2 16 0 6 0 +- 16 -4 +- 10 1 7840 13 Jan 05 13:09 LAG1 5 0 24 19 +- 137 -3 +- 80 3 7840 13 Jan 05 16:35 LAG1 16 0 17 14 +- 16 -3 +- 9 5 7840 14 Jan 05 07:13 LAG2 11 0 15 15 +- 68 0 +- 36 1 7840 14 Jan 05 08:27 LAG1 16 0 5 5 +- 18 0 +- 11 3 7840 14 Jan 05 10:57 LAG2 15 0 8 4 +- 17 -4 +- 10 1 7840 14 Jan 05 11:47 LAG1 11 0 5 2 +- 29 0 +- 21 5 7840 14 Jan 05 15:35 LAG1 8 0 16 12 +- 71 2 +- 39 1 7840 15 Jan 05 17:24 LAG1 17 0 14 10 +- 16 3 +- 10 5 7840 16 Jan 05 09:13 LAG1 14 0 14 12 +- 17 -6 +- 13 3 7840 17 Jan 05 04:11 LAG1 7 0 15 33 +- 85 15 +- 65 3 Station 7841 (Potsdam) (position solved, acc. 10 mm) 7841 10 Jan 05 10:21 LAG1 9 0 7 -7 +- 15 5 +- 16 1 7841 10 Jan 05 10:37 LAG2 16 0 7 -4 +- 10 -3 +- 8 2 7841 12 Jan 05 18:21 LAG1 8 0 5 -10 +- 39 6 +- 35 3 7841 13 Jan 05 06:13 LAG1 12 0 3 0 +- 12 1 +- 6 1 7841 13 Jan 05 08:47 LAG2 16 0 8 -6 +- 11 -2 +- 7 6 7841 16 Jan 05 03:11 LAG2 19 0 4 0 +- 9 -1 +- 7 4 7841 16 Jan 05 05:29 LAG1 22 0 7 2 +- 8 -2 +- 4 5 7841 16 Jan 05 09:00 LAG1 19 0 9 8 +- 9 -1 +- 5 4 7841 16 Jan 05 11:15 LAG2 18 0 6 4 +- 9 -2 +- 7 2 7841 17 Jan 05 04:31 LAG1 7 0 15 -3 +- 60 10 +- 36 6 7841 17 Jan 05 05:17 LAG2 15 0 6 -5 +- 11 1 +- 6 4 7841 17 Jan 05 11:29 LAG1 10 0 24 -53 +- 36 24 +- 19 14 Station 8834 (Wettzell) (position fixed, acc. 10 mm) 8834 10 Jan 05 07:07 LAG2 3 0 2 -67 +-1156 26 +- 465 2 8834 10 Jan 05 07:11 LAG1 7 0 14 -45 +- 135 12 +- 52 2 8834 10 Jan 05 10:09 LAG1 8 0 17 -26 +- 47 -5 +- 27 2 8834 10 Jan 05 10:27 LAG2 13 0 19 -18 +- 11 0 +- 6 3 8834 10 Jan 05 14:01 LAG1 2 0 4 130 +- 852 -75 +- 498 0 8834 10 Jan 05 17:29 LAG1 9 0 17 -2 +- 39 -9 +- 25 3 8834 11 Jan 05 04:59 LAG2 4 0 15 -20 +- 61 3 +- 30 1 8834 11 Jan 05 05:25 LAG1 14 0 21 -7 +- 12 -8 +- 6 4 8834 13 Jan 05 13:07 LAG2 3 0 30 -35 +- 69 -8 +- 127 1 8834 13 Jan 05 13:21 LAG1 7 0 17 -6 +- 40 -6 +- 26 3 8834 15 Jan 05 10:56 LAG1 1 0 6 0 +- 0 0 +- 0 0 8834 15 Jan 05 14:09 LAG1 8 0 7 -8 +- 40 1 +- 21 4 8834 15 Jan 05 17:43 LAG1 10 0 7 0 +- 34 4 +- 24 2 8834 16 Jan 05 01:58 LAG1 6 0 18 -6 +- 33 20 +- 56 4 8834 16 Jan 05 03:29 LAG2 9 0 8 5 +- 35 2 +- 25 2 8834 16 Jan 05 05:33 LAG1 14 0 8 8 +- 15 1 +- 9 5 8834 16 Jan 05 07:21 LAG2 12 0 11 -13 +- 15 9 +- 13 2 8834 16 Jan 05 09:17 LAG1 11 0 13 -7 +- 18 -5 +- 13 0 8834 16 Jan 05 11:27 LAG2 10 0 8 -6 +- 15 1 +- 17 5 8834 16 Jan 05 12:35 LAG1 9 0 14 -15 +- 15 -7 +- 16 3 8834 16 Jan 05 15:19 LAG2 9 0 3 0 +- 14 3 +- 28 3 8834 16 Jan 05 16:09 LAG1 12 0 8 -2 +- 13 7 +- 11 3 8834 17 Jan 05 04:15 LAG1 11 0 6 5 +- 13 1 +- 14 4 8834 17 Jan 05 05:05 LAG2 9 0 13 -39 +- 86 -12 +- 39 2 8834 17 Jan 05 07:45 LAG1 16 0 6 1 +- 10 -1 +- 7 5 8834 17 Jan 05 09:13 LAG2 11 0 13 -10 +- 12 0 +- 6 8 8834 17 Jan 05 11:09 LAG1 3 0 3 -17 +- 389 -6 +- 180 0 8834 17 Jan 05 13:39 LAG2 13 0 4 3 +- 25 -3 +- 17 3 8834 17 Jan 05 15:07 LAG1 2 0 9 162 +- 974 -75 +- 429 0 8834 17 Jan 05 18:25 LAG1 11 0 2 -1 +- 14 2 +- 19 2 -------------------------------------------------------------------------------- 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 040701 - 050118 0/ 17/ 0 0/ 19/ 0 36 1831 LVIL 040815 - 050118 0/ 23/ 0 0/ 25/ 0 48 1864 MD2LAS 040701 - 050117 0/ 87/ 0 0/ 75/ 0 162 1873 SIMLAS 040703 - 040813 0/ 25/ 0 0/ 15/ 0 40 1884 RIGLAS 040712 - 050111 0/ 42/ 1 0/ 18/ 2 63 1893 CRMLAS 040705 - 041012 0/ 45/ 0 0/ 35/ 0 80 6405 TIGO 040710 - 050110 6/ 5/ 0 4/ 4/ 0 19 6810 ZIMLAT 040805 - 050117 163/101/ 18 94/ 96/ 18 490 7080 MLRS25 040701 - 050117 40/ 51/ 2 45/ 63/ 4 205 7090 ML0514 040716 - 050116 104/275/ 23 98/177/ 22 699 7105 ML0725 040701 - 050115 0/ 70/ 4 2/ 76/ 6 158 7110 ML0414 040701 - 041224 63/112/ 13 63/107/ 17 375 7124 ML0819 040705 - 041227 0/ 31/ 0 0/ 11/ 0 42 7231 WUHA01 040701 - 041208 0/ 8/ 0 0/ 20/ 0 28 7237 CHALAS 040702 - 050114 0/129/ 0 0/136/ 1 266 7249 BEJLAS 040701 - 050115 0/ 81/ 0 0/ 91/ 0 172 7308 CRLLAS 041201 - 050111 2/ 7/ 1 2/ 6/ 0 18 7355 TROS02 040702 - 040829 0/ 37/ 0 0/ 29/ 0 66 7405 TIGO 040710 - 050114 2/ 9/ 0 1/ 5/ 0 17 7501 ML0616 040701 - 041215 14/ 20/ 2 55/ 60/ 5 156 7604 BREF 041017 - 041021 0/ 1/ 0 0/ 2/ 0 3 7806 METLAS 040720 - 041203 0/ 16/ 0 0/ 10/ 0 26 7810 ZIMLAT 040701 - 050117 217/127/ 24 119/116/ 21 624 7811 POLLAS 040706 - 050118 0/ 49/ 0 0/ 59/ 0 108 7824 SPNLAS 040701 - 050108 0/ 82/ 0 0/ 77/ 0 159 7825 STL3 040807 - 050116 93/129/ 25 97/ 91/ 19 454 7832 SALRO 040702 - 050118 117/190/ 15 157/218/ 23 720 7835 GRASSE 040702 - 050114 0/ 39/ 1 0/ 27/ 1 68 7836 GFZLAS 040701 - 040701 0/ 1/ 0 0/ 0/ 0 1 7837 CHILAS 040704 - 050111 0/ 85/ 0 0/114/ 1 200 7838 SHOLAS 040701 - 050113 41/105/ 3 69/118/ 7 343 7839 AUSLAS 040701 - 050118 148/148/ 27 74/132/ 21 550 7840 RGOLAS 040701 - 050117 95/ 87/ 22 62/ 73/ 12 351 7841 GFZLA3 040702 - 050117 28/ 56/ 13 19/ 57/ 7 180 7845 GRASLL 040705 - 040920 11/ 14/ 0 3/ 12/ 1 41 7941 MLROnn 040701 - 050104 77/ 54/ 9 68/ 45/ 5 258 8834 WLRS01 040701 - 050118 181/119/ 21 104/124/ 16 565 -------------------------------------------------------------------------- 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) -------------------------------------------------------------- 050111.0 137.1 +/- 0.1 224.6 +/- 0.1 -32565.56 +/- 0.01 050112.0 135.3 +/- 0.1 223.2 +/- 0.1 -32566.20 +/- 0.02 050113.0 132.8 +/- 0.1 222.1 +/- 0.1 -32567.10 +/- 0.03 050114.0 132.1 +/- 0.1 221.3 +/- 0.1 -32568.22 +/- 0.03 050115.0 129.9 +/- 0.1 219.8 +/- 0.1 -32569.42 +/- 0.04 050116.0 128.9 +/- 0.1 218.7 +/- 0.1 -32570.59 +/- 0.04 050117.0 127.7 +/- 0.1 217.2 +/- 0.1 -32571.65 +/- 0.04 -------------------------------------------------------------- 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, 2003, 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 ******************************************************************************** |