| Date: | 2005-02-19 13:15:00 | |
| Sender: | Ron Noomen <Ron Noomen <ron@astro.lr.tudelft.nl>> | |
| Subject: | [SLR-Report] No. 4958: Delft QL Report February 19, 2005 | |
| Author: | Ron Noomen | |
| Content: | ******************************************************************************** SLR Electronic Report 2005-02-19 13:15:00 UTC Message No. 4958 ******************************************************************************** Author: Ron Noomen Subject: Delft QL Report February 19, 2005 WEGENER-2 IERS REPORT OF THE QUICK-LOOK DATA ANALYSIS CENTER DELFT UNIVERSITY OF TECHNOLOGY FACULTY OF AEROSPACE ENGINEERING THE NETHERLANDS February 19, 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 Sat, Feb 19, 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 Sat, Feb 19, 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 ------------------------------------------------------------------------------ 7090 Yarragadee, Australia 050217 - 050218 2 - 7105 Greenbelt, Maryland 050218 - 050218 1 1 7110 Monument Peak, California 050217 - 050218 - 2 7249 Beijing, China 050218 - 050218 1 2 7824 San Fernando, Spain 050217 - 050218 1 2 7825 Mount Stromlo, Australia 050217 - 050218 5 3 7832 Riyad, Saudi Arabia 050217 - 050219 2 3 7835 Grasse, France 050218 - 050218 - 1 7839 Graz, Austria 050218 - 050218 2 1 7840 Herstmonceux, United Kingdom 050218 - 050219 1 2 ------ ------ --- --- TOTAL 050217 - 050219 15 17 ------------------------------------------------------------------------------ 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 Fri, Feb 11, 2005 to Sat, Feb 19, 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 17 16 Number of Passes 87/ 87 66/ 66 Number of Normal Points 875/ 856 0697/ 678 Weighted RMS of Fit (mm) 18 17 ----------------------------------------------------------------------- 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 11 Feb 05 02:01 LAG1 6 0 38 0 +- 511 0 +- 442 38 Station 1864 (Maidanak) (position fixed, acc. 200 mm) 1864 13 Feb 05 20:55 LAG2 3 0 117 137 +-1265 -27 +-1637 9 Station 7080 (McDonald Obs.) (position fixed, acc. 20 mm) 7080 14 Feb 05 19:20 LAG1 1 0 20 0 +- 0 0 +- 0 0 7080 14 Feb 05 20:07 LAG2 7 0 14 4 +- 28 -14 +- 38 7 7080 14 Feb 05 22:45 LAG1 10 0 12 -13 +- 22 3 +- 16 2 7080 15 Feb 05 10:01 LAG2 9 0 13 11 +- 40 0 +- 33 5 7080 15 Feb 05 11:13 LAG1 17 0 11 11 +- 17 -1 +- 10 4 7080 16 Feb 05 10:20 LAG1 1 0 1 0 +- 0 0 +- 0 0 Station 7090 (Yarragadee) (position fixed, acc. 10 mm) 7090 11 Feb 05 11:07 LAG1 14 0 15 9 +- 11 -7 +- 9 4 7090 11 Feb 05 11:53 LAG2 21 0 5 -2 +- 10 3 +- 8 4 7090 11 Feb 05 14:33 LAG1 10 0 10 -9 +- 13 -6 +- 20 2 7090 11 Feb 05 16:01 LAG2 22 0 10 2 +- 9 -6 +- 5 2 7090 11 Feb 05 17:45 LAG1 15 0 7 -7 +- 10 0 +- 7 1 7090 11 Feb 05 21:13 LAG1 8 0 3 4 +- 38 0 +- 25 1 7090 12 Feb 05 13:31 LAG1 6 0 20 -22 +- 60 2 +- 50 5 7090 14 Feb 05 10:12 LAG2 13 0 13 -8 +- 14 -7 +- 17 3 7090 14 Feb 05 10:55 LAG1 5 0 25 14 +- 59 -24 +- 37 7 7090 14 Feb 05 14:09 LAG1 3 0 19 -20 +- 29 7 +- 155 0 7090 14 Feb 05 14:21 LAG2 15 0 8 -5 +- 10 -4 +- 7 2 7090 14 Feb 05 17:13 LAG1 18 0 12 -12 +- 10 2 +- 7 2 7090 14 Feb 05 18:29 LAG2 10 0 16 -14 +- 16 -4 +- 27 1 7090 14 Feb 05 20:47 LAG1 18 0 14 11 +- 12 2 +- 7 3 7090 15 Feb 05 12:11 LAG2 18 0 5 -1 +- 14 3 +- 10 1 7090 15 Feb 05 12:51 LAG1 7 0 13 -11 +- 20 -5 +- 33 1 7090 15 Feb 05 16:03 LAG1 10 0 10 -10 +- 14 1 +- 18 2 7090 15 Feb 05 16:23 LAG2 22 0 14 -13 +- 8 1 +- 6 3 7090 16 Feb 05 08:01 LAG1 7 0 9 -3 +- 16 -8 +- 27 7 7090 16 Feb 05 11:15 LAG1 16 0 6 3 +- 10 -3 +- 7 1 7090 16 Feb 05 14:59 LAG2 3 0 15 53 +- 312 -24 +- 196 1 7090 16 Feb 05 17:53 LAG1 9 0 6 -9 +- 35 -6 +- 19 4 7090 17 Feb 05 19:59 LAG1 17 0 9 -8 +- 10 0 +- 4 2 7090 18 Feb 05 08:39 LAG1 9 0 14 -16 +- 15 -5 +- 10 2 Station 7105 (Greenbelt) (position fixed, acc. 10 mm) 7105 11 Feb 05 05:35 LAG2 17 0 6 -4 +- 10 -1 +- 8 3 7105 11 Feb 05 09:09 LAG1 4 0 13 -92 +- 841 -28 +- 306 3 7105 15 Feb 05 07:18 LAG1 18 0 10 3 +- 10 7 +- 9 6 7105 16 Feb 05 08:11 LAG2 17 0 8 -5 +- 12 -2 +- 8 2 7105 18 Feb 05 04:15 LAG2 5 0 10 -25 +- 47 -18 +- 35 2 7105 18 Feb 05 06:50 LAG1 8 0 13 1 +- 17 18 +- 25 7 Station 7110 (Monument Peak) (position fixed, acc. 10 mm) 7110 16 Feb 05 08:07 LAG2 7 0 23 -14 +- 37 -8 +- 32 1 7110 16 Feb 05 10:01 LAG1 5 0 22 -23 +- 28 4 +- 61 2 7110 16 Feb 05 12:05 LAG2 4 0 16 4 +- 23 15 +- 28 4 7110 16 Feb 05 13:17 LAG1 11 0 11 0 +- 16 -6 +- 9 5 7110 17 Feb 05 10:17 LAG2 3 0 13 -1 +- 136 -10 +- 117 1 7110 18 Feb 05 08:27 LAG2 3 0 21 -11 +- 192 -6 +- 125 0 Station 7237 (Changchun) (position fixed, acc. 50 mm) 7237 11 Feb 05 16:59 LAG2 4 0 67 77 +- 106 -27 +- 181 8 7237 11 Feb 05 20:58 LAG1 3 0 26 -89 +- 781 48 +- 390 22 7237 16 Feb 05 20:59 LAG1 3 0 27 6 +- 158 -27 +- 311 18 Station 7249 (Beijing) (position solved, acc. 50 mm) 7249 18 Feb 05 15:51 LAG2 5 0 23 68 +- 347 -45 +- 264 17 7249 18 Feb 05 19:33 LAG2 15 0 18 8 +- 44 -13 +- 35 10 7249 18 Feb 05 21:45 LAG1 12 0 16 -2 +- 44 -9 +- 35 10 Station 7501 (Hartebeesthoek) (position fixed, acc. 10 mm) 7501 15 Feb 05 00:37 LAG1 11 0 25 24 +- 12 6 +- 11 2 7501 16 Feb 05 02:49 LAG1 9 0 5 1 +- 14 3 +- 17 4 7501 17 Feb 05 01:23 LAG1 6 0 7 8 +- 42 1 +- 31 0 Station 7824 (San Fernando) (position fixed, acc. 40 mm) 7824 11 Feb 05 01:42 LAG2 6 0 42 52 +- 541 4 +- 239 8 7824 12 Feb 05 00:03 LAG2 3 0 25 -19 +- 743 -36 +- 612 1 7824 12 Feb 05 04:09 LAG1 2 0 48 -364 +-5293 -183 +-2360 0 7824 12 Feb 05 04:25 LAG2 1 0 43 0 +- 0 0 +- 0 0 7824 13 Feb 05 02:01 LAG2 4 0 84 -75 +- 466 -76 +- 228 13 7824 14 Feb 05 19:09 LAG1 6 0 21 31 +- 179 -13 +- 201 5 7824 15 Feb 05 02:49 LAG2 3 0 73 39 +- 989 15 +- 448 2 7824 15 Feb 05 03:43 LAG1 4 0 40 48 +- 240 9 +- 237 5 7824 17 Feb 05 04:51 LAG1 5 0 30 44 +- 407 -6 +- 199 2 7824 17 Feb 05 18:25 LAG1 7 0 17 27 +- 80 -18 +- 87 3 7824 18 Feb 05 04:47 LAG2 7 0 42 36 +- 85 -8 +- 96 3 7824 18 Feb 05 23:09 LAG2 5 0 34 35 +- 150 -1 +- 142 0 Station 7825 (Mount Stromlo) (position solved, acc. 10 mm) 7825 11 Feb 05 07:19 LAG1 17 0 25 3 +- 10 2 +- 4 25 7825 11 Feb 05 08:13 LAG2 12 0 19 -48 +- 33 26 +- 22 5 7825 11 Feb 05 10:53 LAG1 16 0 13 -3 +- 10 3 +- 8 12 7825 11 Feb 05 12:03 LAG2 19 0 21 2 +- 9 5 +- 5 18 7825 11 Feb 05 14:17 LAG1 14 0 16 5 +- 12 7 +- 10 11 7825 12 Feb 05 06:00 LAG1 8 0 22 17 +- 17 -4 +- 7 16 7825 13 Feb 05 08:41 LAG2 3 0 29 32 +- 742 -2 +- 430 1 7825 13 Feb 05 11:45 LAG1 11 0 55 30 +- 14 34 +- 15 17 7825 13 Feb 05 12:17 LAG2 16 0 34 15 +- 10 13 +- 6 24 7825 14 Feb 05 06:35 LAG2 7 0 14 -85 +- 99 51 +- 57 2 7825 14 Feb 05 06:51 LAG1 16 0 18 8 +- 10 3 +- 6 15 7825 14 Feb 05 10:12 LAG2 13 0 55 22 +- 14 11 +- 8 40 7825 14 Feb 05 10:19 LAG1 10 0 40 37 +- 13 2 +- 8 15 7825 14 Feb 05 13:39 LAG1 15 0 27 16 +- 10 -11 +- 9 16 7825 14 Feb 05 14:19 LAG2 24 0 55 44 +- 8 10 +- 5 31 7825 14 Feb 05 16:55 LAG1 23 0 43 0 +- 8 -11 +- 4 36 7825 15 Feb 05 15:37 LAG1 22 0 31 -16 +- 8 -2 +- 4 26 7825 15 Feb 05 19:17 LAG1 11 0 42 33 +- 12 10 +- 8 15 7825 16 Feb 05 04:09 LAG1 14 0 48 47 +- 11 6 +- 14 8 7825 16 Feb 05 06:47 LAG2 10 0 17 -64 +- 57 40 +- 33 7 7825 16 Feb 05 07:35 LAG1 17 0 23 -13 +- 10 0 +- 5 19 7825 16 Feb 05 10:27 LAG2 24 0 36 10 +- 8 0 +- 5 35 7825 16 Feb 05 11:07 LAG1 10 0 44 43 +- 13 -2 +- 11 12 7825 16 Feb 05 14:27 LAG1 4 0 22 -33 +- 96 -43 +- 77 0 7825 16 Feb 05 14:35 LAG2 6 0 19 -55 +- 109 -43 +- 66 5 7825 17 Feb 05 06:19 LAG1 21 0 36 -10 +- 9 15 +- 5 24 7825 17 Feb 05 08:35 LAG2 24 0 21 1 +- 8 2 +- 6 21 7825 17 Feb 05 09:45 LAG1 18 0 21 6 +- 9 -1 +- 7 20 7825 18 Feb 05 04:53 LAG1 12 0 15 10 +- 13 0 +- 10 10 7825 18 Feb 05 10:43 LAG2 15 0 30 -2 +- 11 8 +- 6 27 7825 18 Feb 05 12:15 LAG1 2 0 8 0 +- 724 5 +- 499 0 7825 18 Feb 05 14:51 LAG2 13 0 11 0 +- 14 -11 +- 15 6 7825 18 Feb 05 15:23 LAG1 7 0 13 0 +- 24 -11 +- 23 3 Station 7832 (Riyad) (position solved, acc. 20 mm) 7832 12 Feb 05 00:16 LAG2 9 0 3 2 +- 22 -2 +- 31 1 7832 12 Feb 05 00:35 LAG1 8 0 27 12 +- 26 -14 +- 20 1 7832 14 Feb 05 00:19 LAG2 10 0 30 41 +- 58 8 +- 37 9 7832 14 Feb 05 01:19 LAG1 9 0 13 -1 +- 60 6 +- 32 3 7832 14 Feb 05 15:05 LAG1 11 0 3 1 +- 25 0 +- 31 3 7832 15 Feb 05 13:43 LAG1 2 0 22 45 +- 213 121 +- 403 0 7832 16 Feb 05 12:31 LAG1 7 0 17 -9 +- 104 -3 +- 53 3 7832 17 Feb 05 14:25 LAG1 8 0 12 -12 +- 30 -9 +- 43 7 7832 18 Feb 05 22:55 LAG2 13 0 12 -4 +- 22 6 +- 18 3 Station 7835 (Grasse) (position fixed, acc. 30 mm) 7835 15 Feb 05 17:29 LAG1 14 0 9 9 +- 25 5 +- 32 1 7835 17 Feb 05 04:17 LAG1 21 0 11 10 +- 21 -1 +- 11 2 7835 18 Feb 05 00:47 LAG2 16 0 5 0 +- 24 -2 +- 16 3 Station 7839 (Graz) (position fixed, acc. 10 mm) 7839 14 Feb 05 08:37 LAG2 12 0 6 5 +- 12 -2 +- 12 1 7839 14 Feb 05 11:36 LAG1 7 0 7 -6 +- 64 -6 +- 32 0 7839 14 Feb 05 15:15 LAG1 12 0 5 0 +- 12 -3 +- 9 2 7839 16 Feb 05 23:04 LAG2 2 0 12 -15 +- 53 4 +- 60 0 7839 17 Feb 05 00:41 LAG1 8 0 2 -3 +- 20 -5 +- 37 1 7839 17 Feb 05 02:35 LAG2 13 0 11 -1 +- 11 4 +- 5 4 7839 17 Feb 05 06:59 LAG2 10 0 4 -1 +- 13 -3 +- 12 0 7839 17 Feb 05 07:55 LAG1 3 0 13 11 +- 34 -5 +- 62 1 7839 18 Feb 05 08:50 LAG2 12 0 14 -11 +- 12 -6 +- 8 5 7839 18 Feb 05 09:51 LAG1 11 0 12 -6 +- 14 6 +- 12 2 7839 18 Feb 05 13:13 LAG1 20 0 7 -4 +- 9 -2 +- 5 4 Station 7840 (Herstmonceux) (position fixed, acc. 20 mm) 7840 12 Feb 05 18:15 LAG1 4 0 30 4 +- 109 47 +- 153 6 7840 13 Feb 05 02:21 LAG2 10 0 9 5 +- 20 -6 +- 25 4 7840 13 Feb 05 02:41 LAG1 7 0 28 -3 +- 44 33 +- 59 2 7840 13 Feb 05 10:07 LAG1 4 0 3 -25 +- 294 12 +- 151 1 7840 13 Feb 05 10:21 LAG2 4 0 10 -6 +- 215 1 +- 145 3 7840 14 Feb 05 00:25 LAG2 7 0 13 -7 +- 25 -6 +- 17 1 7840 14 Feb 05 04:15 LAG2 9 0 16 11 +- 26 10 +- 14 2 7840 14 Feb 05 04:47 LAG1 14 0 6 4 +- 18 0 +- 10 5 7840 14 Feb 05 08:56 LAG2 2 0 10 1 +-1151 4 +- 604 0 7840 14 Feb 05 11:46 LAG1 16 0 8 4 +- 16 -4 +- 10 2 7840 15 Feb 05 02:21 LAG2 17 0 13 -2 +- 18 8 +- 12 2 7840 15 Feb 05 03:27 LAG1 16 0 10 3 +- 16 6 +- 12 3 7840 15 Feb 05 06:23 LAG2 15 0 16 14 +- 18 7 +- 10 5 7840 15 Feb 05 07:11 LAG1 14 0 11 11 +- 22 0 +- 14 1 7840 15 Feb 05 10:27 LAG1 6 0 14 13 +- 27 -2 +- 14 2 7840 15 Feb 05 10:31 LAG2 7 0 10 -9 +- 25 0 +- 17 5 7840 18 Feb 05 23:09 LAG2 8 0 8 -2 +- 25 12 +- 43 4 Station 7841 (Potsdam) (position solved, acc. 10 mm) 7841 11 Feb 05 08:49 LAG1 12 0 5 -2 +- 17 -1 +- 11 5 7841 11 Feb 05 10:05 LAG2 15 0 24 -12 +- 13 -10 +- 10 21 Station 7941 (Matera) (position solved, acc. 10 mm) 7941 11 Feb 05 05:55 LAG1 4 0 19 -42 +- 320 9 +- 133 3 7941 11 Feb 05 06:09 LAG2 15 0 21 6 +- 10 16 +- 9 5 7941 12 Feb 05 00:05 LAG2 16 0 10 -3 +- 10 -5 +- 6 4 7941 12 Feb 05 14:27 LAG1 16 1 9 -6 +- 11 6 +- 8 4 7941 12 Feb 05 22:31 LAG2 10 0 16 5 +- 20 -23 +- 22 1 7941 13 Feb 05 09:45 LAG1 8 0 7 -7 +- 15 0 +- 21 3 7941 13 Feb 05 12:57 LAG1 14 0 7 6 +- 12 3 +- 7 2 7941 14 Feb 05 00:25 LAG2 4 0 2 -4 +- 103 -2 +- 78 1 7941 15 Feb 05 14:05 LAG1 7 0 13 1 +- 41 8 +- 27 3 7941 16 Feb 05 22:39 LAG2 18 0 2 1 +- 10 -1 +- 8 1 Station 8834 (Wettzell) (position fixed, acc. 10 mm) 8834 14 Feb 05 15:54 LAG1 2 0 12 14 +-1319 -10 +- 508 0 8834 15 Feb 05 10:43 LAG2 5 0 32 -32 +- 19 1 +- 17 2 8834 15 Feb 05 10:53 LAG1 1 0 20 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 040701 - 050211 0/ 19/ 0 0/ 22/ 0 41 1831 LVIL 040815 - 050210 0/ 24/ 0 0/ 30/ 0 54 1864 MD2LAS 040701 - 050213 0/ 87/ 0 0/ 76/ 0 163 1873 SIMLAS 040703 - 040813 0/ 25/ 0 0/ 15/ 0 40 1884 RIGLAS 040712 - 050119 0/ 43/ 1 0/ 18/ 2 64 1893 CRMLAS 040705 - 041012 0/ 45/ 0 0/ 35/ 0 80 6405 TIGO 040710 - 050209 10/ 13/ 1 6/ 18/ 1 49 6810 ZIMLAT 040805 - 050209 188/116/ 21 111/108/ 19 563 7080 MLRS25 040701 - 050216 47/ 57/ 2 46/ 67/ 5 224 7090 ML0514 040716 - 050218 124/343/ 35 113/232/ 25 872 7105 ML0725 040701 - 050218 0/ 80/ 4 2/ 89/ 7 182 7110 ML0414 040701 - 050218 72/122/ 16 72/121/ 17 420 7124 ML0819 040705 - 050126 0/ 31/ 0 0/ 14/ 0 45 7231 WUHA01 040701 - 041208 0/ 8/ 0 0/ 20/ 0 28 7237 CHALAS 040702 - 050216 0/137/ 1 0/147/ 1 286 7249 BEJLAS 040701 - 050218 0/ 88/ 0 0/101/ 0 189 7308 CRLLAS 041201 - 050205 3/ 11/ 2 3/ 13/ 0 32 7355 TROS02 040702 - 040829 0/ 37/ 0 0/ 29/ 0 66 7405 TIGO 040710 - 050209 5/ 28/ 0 3/ 10/ 0 46 7501 ML0616 040701 - 050217 19/ 33/ 3 58/ 72/ 6 191 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 - 050209 242/142/ 27 136/127/ 23 697 7811 POLLAS 040706 - 050209 0/ 51/ 0 0/ 59/ 0 110 7824 SPNLAS 040701 - 050218 0/100/ 0 0/ 93/ 0 193 7825 STL3 040807 - 050218 118/170/ 29 112/128/ 23 580 7832 SALRO 040702 - 050219 131/202/ 18 175/233/ 23 782 7835 GRASSE 040702 - 050218 0/ 46/ 1 0/ 32/ 1 80 7836 GFZLAS 040701 - 040701 0/ 1/ 0 0/ 0/ 0 1 7837 CHILAS 040704 - 050202 0/ 86/ 0 0/116/ 1 203 7838 SHOLAS 040701 - 050210 47/118/ 3 76/133/ 7 384 7839 AUSLAS 040701 - 050218 168/160/ 29 86/143/ 22 608 7840 RGOLAS 040701 - 050219 113/ 97/ 24 74/ 81/ 13 402 7841 GFZLA3 040702 - 050211 38/ 59/ 15 23/ 60/ 8 203 7845 GRASLL 040705 - 040920 11/ 14/ 0 3/ 12/ 1 41 7941 MLROnn 040701 - 050216 88/ 59/ 9 73/ 54/ 5 288 8834 WLRS01 040701 - 050215 195/127/ 24 118/133/ 18 615 -------------------------------------------------------------------------- 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) -------------------------------------------------------------- 050212.0 62.8 +/- 0.2 202.5 +/- 0.2 -32586.31 +/- 0.02 050213.0 58.3 +/- 0.2 202.9 +/- 0.2 -32587.77 +/- 0.04 050214.0 56.9 +/- 0.2 203.3 +/- 0.2 -32589.01 +/- 0.06 050215.0 54.3 +/- 0.1 203.4 +/- 0.1 -32590.02 +/- 0.06 050216.0 52.0 +/- 0.2 203.3 +/- 0.1 -32590.82 +/- 0.07 050217.0 48.3 +/- 0.1 203.0 +/- 0.2 -32591.29 +/- 0.07 050218.0 44.7 +/- 0.2 203.5 +/- 0.2 -32591.71 +/- 0.08 -------------------------------------------------------------- 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 ******************************************************************************** |