| Date: | 2005-01-02 13:15:00 | |
| Sender: | Ron Noomen <Ron Noomen <ron@astro.lr.tudelft.nl>> | |
| Subject: | [SLR-Report] No. 4746: Delft QL Report January 02, 2005 | |
| Author: | Ron Noomen | |
| Content: | ******************************************************************************** SLR Electronic Report 2005-01-02 13:15:00 UTC Message No. 4746 ******************************************************************************** Author: Ron Noomen Subject: Delft QL Report January 02, 2005 WEGENER-2 IERS REPORT OF THE QUICK-LOOK DATA ANALYSIS CENTER DELFT UNIVERSITY OF TECHNOLOGY FACULTY OF AEROSPACE ENGINEERING THE NETHERLANDS January 2, 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 Sun, Jan 2, 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 Sun, Jan 2, 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 ------------------------------------------------------------------------------ 6810 Zimmerwald 846, Switzerland 050101 - 050101 2 1 7090 Yarragadee, Australia 041231 - 050101 3 1 7237 Changchun, China 041231 - 041231 1 - 7249 Beijing, China 041231 - 050101 3 3 7810 Zimmerwald 423, Switzerland 050101 - 050101 2 1 7825 Mount Stromlo, Australia 041231 - 050101 4 5 7832 Riyad, Saudi Arabia 050101 - 050102 4 5 7837 Shanghai Observatory, China 041231 - 041231 - 1 7840 Herstmonceux, United Kingdom 041231 - 050102 2 1 ------ ------ --- --- TOTAL 041231 - 050102 21 18 ------------------------------------------------------------------------------ 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, Dec 25, 2004 to Sun, Jan 2, 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 14 13 Number of Passes 106/106 88/ 87 Number of Normal Points 1167/1156 1149/1136 Weighted RMS of Fit (mm) 12 10 ----------------------------------------------------------------------- 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 6405 (Concepcion) (position solved, acc. 20 mm) 6405 29 Dec 04 22:39 LAG1 2 0 0 0 +- 416 0 +- 497 0 Station 6810 (Zimmerwald 846) (position fixed, acc. 60 mm) 6810 25 Dec 04 07:53 LAG1 6 0 17 -81 +- 625 26 +- 251 4 6810 25 Dec 04 08:29 LAG2 25 0 7 -4 +- 36 -1 +- 20 5 6810 29 Dec 04 13:10 LAG2 15 0 7 -3 +- 47 0 +- 35 6 6810 30 Dec 04 11:05 LAG1 13 0 19 -17 +- 51 4 +- 36 3 6810 30 Dec 04 11:07 LAG2 20 0 12 -7 +- 40 -5 +- 23 4 6810 30 Dec 04 14:35 LAG1 15 0 5 -2 +- 49 -1 +- 30 3 6810 30 Dec 04 15:14 LAG2 18 0 16 -9 +- 43 -9 +- 28 2 6810 30 Dec 04 17:57 LAG1 18 0 8 -4 +- 43 2 +- 25 5 6810 1 Jan 05 08:27 LAG1 15 0 8 -7 +- 47 0 +- 31 4 6810 1 Jan 05 11:23 LAG2 21 0 8 -4 +- 40 -3 +- 22 4 6810 1 Jan 05 11:49 LAG1 13 0 18 -16 +- 51 0 +- 31 8 Station 7080 (McDonald Obs.) (position fixed, acc. 20 mm) 7080 30 Dec 04 03:03 LAG1 5 0 37 11 +- 49 -41 +- 46 13 Station 7090 (Yarragadee) (position fixed, acc. 10 mm) 7090 26 Dec 04 11:43 LAG1 6 0 3 14 +- 125 7 +- 54 1 7090 26 Dec 04 12:07 LAG2 19 0 8 0 +- 9 -4 +- 5 1 7090 26 Dec 04 15:34 LAG1 2 0 13 98 +- 291 -91 +- 250 0 7090 26 Dec 04 16:25 LAG2 24 0 8 4 +- 8 -4 +- 7 3 7090 26 Dec 04 18:31 LAG1 11 0 8 6 +- 12 -3 +- 15 2 7090 27 Dec 04 19:01 LAG2 15 0 11 -2 +- 16 7 +- 10 2 7090 27 Dec 04 20:31 LAG1 19 0 23 -7 +- 9 14 +- 5 1 7090 28 Dec 04 19:17 LAG1 10 0 17 -8 +- 14 -8 +- 9 1 7090 29 Dec 04 10:29 LAG2 19 0 5 1 +- 9 3 +- 7 3 7090 29 Dec 04 11:27 LAG1 8 0 7 -2 +- 20 -3 +- 17 2 7090 29 Dec 04 14:49 LAG1 7 0 5 -3 +- 16 -1 +- 30 4 7090 29 Dec 04 15:11 LAG2 4 0 13 -23 +- 141 9 +- 127 0 7090 29 Dec 04 18:01 LAG1 10 0 11 -9 +- 13 -1 +- 18 4 7090 29 Dec 04 18:57 LAG2 25 0 6 -5 +- 8 1 +- 5 1 7090 30 Dec 04 08:55 LAG2 9 0 19 -19 +- 18 1 +- 26 7 7090 30 Dec 04 09:51 LAG1 13 0 15 -14 +- 11 0 +- 8 2 7090 31 Dec 04 19:03 LAG1 6 0 4 -12 +- 93 4 +- 51 1 7090 31 Dec 04 19:13 LAG2 21 0 6 -4 +- 9 2 +- 4 2 7090 31 Dec 04 22:27 LAG1 7 0 6 -21 +- 65 11 +- 33 2 7090 1 Jan 05 10:53 LAG1 9 0 15 -11 +- 20 -4 +- 17 2 Station 7124 (Papeete) (position fixed, acc. 10 mm) 7124 27 Dec 04 11:26 LAG2 6 0 65 75 +- 29 25 +- 60 1 Station 7237 (Changchun) (position fixed, acc. 50 mm) 7237 25 Dec 04 10:24 LAG1 5 0 36 -35 +- 72 -1 +- 115 9 7237 26 Dec 04 21:12 LAG1 8 0 16 -19 +- 82 -7 +- 86 7 7237 28 Dec 04 09:45 LAG1 5 0 5 -3 +- 221 0 +- 172 3 7237 28 Dec 04 21:47 LAG2 5 0 34 -26 +- 139 7 +- 153 11 7237 28 Dec 04 22:00 LAG1 3 0 21 -31 +- 898 -28 +- 499 7 7237 30 Dec 04 22:13 LAG2 6 0 31 -39 +- 153 7 +- 123 4 7237 31 Dec 04 09:09 LAG1 6 0 19 -7 +- 64 7 +- 37 13 Station 7249 (Beijing) (position solved, acc. 50 mm) 7249 30 Dec 04 10:35 LAG1 8 0 9 -4 +- 56 5 +- 41 6 7249 30 Dec 04 21:51 LAG2 5 0 20 -3 +- 118 -16 +- 86 4 7249 31 Dec 04 10:15 LAG2 13 0 8 0 +- 55 2 +- 63 7 7249 31 Dec 04 12:49 LAG1 7 0 12 -16 +- 89 -30 +- 178 5 7249 31 Dec 04 20:12 LAG2 3 0 299 62 +- 100 -1471 +- 562 34*CHK* 7249 31 Dec 04 21:39 LAG1 8 0 12 -9 +- 61 5 +- 61 9 7249 1 Jan 05 11:27 LAG1 12 0 14 -5 +- 52 12 +- 47 8 7249 1 Jan 05 22:11 LAG2 5 1 132 187 +- 116 221 +- 153 41*CHK* Station 7810 (Zimmerwald 423) (position fixed, acc. 60 mm) 7810 25 Dec 04 07:53 LAG1 6 0 6 -41 +- 580 15 +- 231 1 7810 29 Dec 04 12:27 LAG1 11 0 14 -12 +- 64 1 +- 58 4 7810 29 Dec 04 13:17 LAG2 17 0 6 -5 +- 45 0 +- 36 4 7810 30 Dec 04 11:06 LAG1 14 0 21 -18 +- 50 4 +- 40 4 7810 30 Dec 04 11:11 LAG2 19 0 9 -1 +- 42 -5 +- 25 3 7810 30 Dec 04 14:35 LAG1 15 0 10 -6 +- 49 -3 +- 30 2 7810 30 Dec 04 15:14 LAG2 19 0 16 -11 +- 42 -8 +- 26 3 7810 30 Dec 04 17:57 LAG1 18 0 10 -9 +- 43 1 +- 25 3 7810 1 Jan 05 08:27 LAG1 15 0 5 -3 +- 47 0 +- 30 3 7810 1 Jan 05 11:23 LAG2 18 0 9 -8 +- 45 -3 +- 24 2 7810 1 Jan 05 11:49 LAG1 14 0 21 -19 +- 50 -1 +- 29 6 Station 7824 (San Fernando) (position fixed, acc. 40 mm) 7824 26 Dec 04 19:59 LAG1 7 0 48 44 +- 120 -4 +- 107 1 7824 27 Dec 04 18:29 LAG1 7 0 55 89 +- 265 16 +- 122 1 Station 7825 (Mount Stromlo) (position solved, acc. 10 mm) 7825 25 Dec 04 09:23 LAG1 5 0 17 33 +- 43 10 +- 23 4 7825 25 Dec 04 18:35 LAG2 26 0 10 3 +- 8 5 +- 4 2 7825 25 Dec 04 19:39 LAG1 16 1 18 -1 +- 10 11 +- 7 8 7825 26 Dec 04 08:11 LAG1 12 0 8 -8 +- 12 0 +- 11 2 7825 26 Dec 04 08:35 LAG2 16 0 6 0 +- 11 4 +- 9 1 7825 26 Dec 04 11:51 LAG1 7 0 8 16 +- 39 -11 +- 30 5 7825 26 Dec 04 12:53 LAG2 8 0 10 -4 +- 26 -5 +- 19 1 7825 26 Dec 04 15:01 LAG1 11 0 13 1 +- 13 -15 +- 15 1 7825 26 Dec 04 16:41 LAG2 25 0 15 3 +- 8 -8 +- 4 4 7825 26 Dec 04 18:09 LAG1 21 0 18 -2 +- 9 -9 +- 4 2 7825 26 Dec 04 20:51 LAG2 14 0 11 3 +- 11 -12 +- 13 2 7825 26 Dec 04 21:49 LAG1 17 0 11 9 +- 10 -2 +- 9 4 7825 27 Dec 04 14:43 LAG2 20 0 7 0 +- 9 3 +- 6 3 7825 27 Dec 04 16:55 LAG1 19 0 7 -3 +- 9 2 +- 6 6 7825 27 Dec 04 18:51 LAG2 24 0 17 6 +- 8 9 +- 5 4 7825 27 Dec 04 20:19 LAG1 15 1 15 -6 +- 15 5 +- 9 2 7825 28 Dec 04 08:53 LAG1 12 0 14 9 +- 12 4 +- 6 6 7825 28 Dec 04 09:09 LAG2 9 0 13 33 +- 81 -11 +- 40 2 7825 28 Dec 04 12:21 LAG1 13 0 2 0 +- 11 1 +- 9 2 7825 28 Dec 04 12:53 LAG2 19 0 8 -5 +- 9 -4 +- 8 1 7825 28 Dec 04 15:39 LAG1 13 0 16 -3 +- 11 -12 +- 9 4 7825 28 Dec 04 16:55 LAG2 26 0 8 -7 +- 8 -1 +- 4 2 7825 28 Dec 04 19:11 LAG1 13 1 35 -12 +- 15 -15 +- 9 6 7825 29 Dec 04 06:47 LAG2 16 0 8 1 +- 11 8 +- 11 2 7825 29 Dec 04 07:31 LAG1 15 0 15 -12 +- 10 -8 +- 9 3 7825 29 Dec 04 10:57 LAG1 14 0 5 3 +- 14 -1 +- 9 2 7825 29 Dec 04 14:25 LAG1 13 0 10 9 +- 11 -5 +- 12 3 7825 29 Dec 04 14:57 LAG2 21 0 15 12 +- 9 -2 +- 5 5 7825 29 Dec 04 17:37 LAG1 22 0 7 0 +- 8 -3 +- 4 4 7825 29 Dec 04 19:04 LAG2 20 0 11 -4 +- 9 5 +- 5 5 7825 29 Dec 04 21:13 LAG1 19 0 6 -5 +- 9 0 +- 7 2 7825 30 Dec 04 09:07 LAG2 15 0 9 12 +- 16 -4 +- 11 3 7825 30 Dec 04 09:37 LAG1 18 0 14 13 +- 10 4 +- 6 3 7825 30 Dec 04 12:57 LAG2 21 0 13 -6 +- 9 -9 +- 6 2 7825 30 Dec 04 16:21 LAG1 19 0 6 4 +- 9 0 +- 6 5 7825 30 Dec 04 17:09 LAG2 26 0 7 4 +- 8 1 +- 4 5 7825 30 Dec 04 19:45 LAG1 20 0 18 -15 +- 9 1 +- 4 9 7825 31 Dec 04 06:57 LAG2 16 1 10 9 +- 11 5 +- 9 5 7825 31 Dec 04 08:14 LAG1 22 0 6 5 +- 9 0 +- 5 3 7825 31 Dec 04 11:15 LAG2 6 0 6 -7 +- 21 -4 +- 42 2 7825 31 Dec 04 11:49 LAG1 11 0 9 -3 +- 13 4 +- 10 7 7825 31 Dec 04 15:09 LAG1 12 0 9 0 +- 12 -7 +- 10 4 7825 31 Dec 04 15:19 LAG2 19 0 6 4 +- 10 -2 +- 6 5 7825 31 Dec 04 18:23 LAG1 13 0 9 -5 +- 11 0 +- 5 8 7825 31 Dec 04 19:41 LAG2 9 0 7 -11 +- 30 9 +- 26 4 7825 1 Jan 05 13:37 LAG2 5 0 8 11 +- 28 -21 +- 48 1 Station 7832 (Riyad) (position solved, acc. 20 mm) 7832 25 Dec 04 03:59 LAG1 16 0 6 0 +- 17 0 +- 10 6 7832 25 Dec 04 04:50 LAG2 9 0 12 11 +- 25 -10 +- 30 7 7832 26 Dec 04 02:37 LAG1 4 0 18 33 +- 194 33 +- 130 1 7832 26 Dec 04 06:16 LAG1 8 0 9 -8 +- 36 13 +- 36 2 7832 26 Dec 04 07:05 LAG2 9 0 19 -7 +- 32 -17 +- 40 3 7832 26 Dec 04 11:19 LAG2 14 0 11 9 +- 19 -8 +- 14 3 7832 26 Dec 04 12:37 LAG1 9 0 12 8 +- 37 -3 +- 31 2 7832 26 Dec 04 15:17 LAG2 7 0 8 -32 +- 100 -21 +- 76 2 7832 26 Dec 04 16:07 LAG1 6 0 2 -5 +- 85 -4 +- 63 1 7832 27 Dec 04 00:57 LAG2 8 0 38 23 +- 40 -22 +- 54 1 7832 27 Dec 04 01:13 LAG1 10 0 13 16 +- 27 15 +- 34 4 7832 27 Dec 04 13:17 LAG2 11 0 12 -13 +- 70 -13 +- 39 2 7832 27 Dec 04 14:39 LAG1 7 0 22 -44 +- 134 -10 +- 61 3 7832 28 Dec 04 02:57 LAG2 6 0 11 18 +- 156 4 +- 85 3 7832 28 Dec 04 07:01 LAG1 6 0 13 9 +- 31 7 +- 59 5 7832 28 Dec 04 07:15 LAG2 8 0 5 -5 +- 26 -10 +- 53 2 7832 28 Dec 04 11:25 LAG2 7 0 3 -8 +- 151 -6 +- 91 2 7832 28 Dec 04 15:45 LAG2 13 0 13 -8 +- 28 -4 +- 30 4 7832 28 Dec 04 17:01 LAG1 13 0 5 5 +- 19 -3 +- 23 1 7832 29 Dec 04 01:07 LAG2 12 0 15 -13 +- 23 -20 +- 26 4 7832 29 Dec 04 05:09 LAG2 11 0 5 2 +- 25 -3 +- 25 1 7832 29 Dec 04 05:39 LAG1 8 0 12 11 +- 23 -8 +- 32 2 7832 29 Dec 04 09:37 LAG2 10 0 9 -7 +- 20 9 +- 40 3 7832 29 Dec 04 12:07 LAG1 5 0 2 1 +- 92 0 +- 82 1 7832 29 Dec 04 13:39 LAG2 11 0 3 -3 +- 31 -2 +- 27 2 7832 29 Dec 04 15:25 LAG1 11 0 7 -10 +- 50 -2 +- 27 1 7832 30 Dec 04 07:37 LAG2 11 0 7 0 +- 28 5 +- 27 4 7832 30 Dec 04 11:43 LAG2 10 0 10 -11 +- 36 -10 +- 30 7 7832 1 Jan 05 05:05 LAG1 7 0 14 13 +- 26 -4 +- 15 6 7832 1 Jan 05 07:48 LAG2 5 0 3 -3 +- 53 -6 +- 121 3 7832 1 Jan 05 11:41 LAG1 7 0 14 -13 +- 25 -7 +- 48 2 7832 1 Jan 05 12:01 LAG2 7 0 13 -22 +- 65 -9 +- 57 3 7832 1 Jan 05 14:51 LAG1 8 0 9 -25 +- 120 -7 +- 54 3 7832 1 Jan 05 16:09 LAG2 7 0 3 0 +- 25 -5 +- 90 2 Station 7837 (Shanghai Observatory) (position fixed, acc. 50 mm) 7837 31 Dec 04 10:31 LAG2 6 0 24 -5 +- 183 19 +- 239 22 Station 7838 (Simosato Observatory) (position fixed, acc. 30 mm) 7838 26 Dec 04 03:41 LAG2 13 0 27 8 +- 29 20 +- 29 9 7838 26 Dec 04 05:29 LAG1 11 0 15 19 +- 39 -7 +- 34 5 7838 26 Dec 04 07:35 LAG2 26 0 21 6 +- 18 11 +- 11 8 7838 26 Dec 04 08:37 LAG1 25 0 18 16 +- 19 0 +- 9 7 7838 27 Dec 04 00:45 LAG1 8 0 18 0 +- 37 -14 +- 31 8 7838 27 Dec 04 01:35 LAG2 16 0 14 6 +- 24 5 +- 23 10 7838 27 Dec 04 07:21 LAG1 20 0 25 19 +- 22 -10 +- 12 9 7838 27 Dec 04 09:49 LAG2 17 0 7 0 +- 23 6 +- 28 5 7838 27 Dec 04 11:07 LAG1 10 0 20 -19 +- 35 -3 +- 51 3 7838 28 Dec 04 06:07 LAG1 9 0 30 21 +- 39 -12 +- 39 4 7838 28 Dec 04 07:48 LAG2 21 0 29 18 +- 21 18 +- 15 4 7838 28 Dec 04 09:36 LAG1 5 0 13 0 +- 128 -10 +- 103 3 Station 7839 (Graz) (position fixed, acc. 10 mm) 7839 29 Dec 04 09:12 LAG1 4 0 19 -19 +- 30 0 +- 56 0 7839 29 Dec 04 09:25 LAG2 6 0 9 -11 +- 23 10 +- 19 2 7839 29 Dec 04 13:13 LAG2 17 0 3 -2 +- 11 -3 +- 8 0 7839 29 Dec 04 16:13 LAG1 9 0 5 -5 +- 54 0 +- 21 3 7839 29 Dec 04 17:39 LAG2 4 0 18 -28 +- 126 8 +- 108 0 7839 29 Dec 04 19:35 LAG1 13 0 4 -3 +- 12 0 +- 15 2 7839 30 Dec 04 03:19 LAG2 11 0 5 4 +- 12 -1 +- 10 1 7839 30 Dec 04 03:55 LAG1 19 0 6 -1 +- 9 1 +- 5 5 7839 30 Dec 04 07:13 LAG2 14 0 6 -4 +- 11 2 +- 6 2 7839 30 Dec 04 07:29 LAG1 17 0 12 -7 +- 10 3 +- 4 3 7839 30 Dec 04 11:23 LAG1 4 0 8 -19 +- 49 11 +- 28 0 7839 30 Dec 04 14:27 LAG1 13 0 2 0 +- 14 1 +- 9 1 Station 7840 (Herstmonceux) (position fixed, acc. 20 mm) 7840 25 Dec 04 07:51 LAG1 6 0 6 -41 +- 180 18 +- 79 2 7840 25 Dec 04 11:01 LAG1 6 0 21 -11 +- 27 10 +- 17 3 7840 27 Dec 04 04:43 LAG1 9 0 14 14 +- 24 -1 +- 27 2 7840 27 Dec 04 05:07 LAG2 6 0 8 8 +- 30 0 +- 40 2 7840 27 Dec 04 08:11 LAG1 7 0 23 -17 +- 30 5 +- 20 6 7840 27 Dec 04 09:25 LAG2 3 0 22 58 +- 865 -16 +- 383 0 7840 27 Dec 04 11:55 LAG1 10 0 13 -5 +- 32 12 +- 24 2 7840 27 Dec 04 12:51 LAG2 5 0 18 42 +- 314 12 +- 154 2 7840 27 Dec 04 17:13 LAG2 8 0 7 -7 +- 43 1 +- 36 2 7840 28 Dec 04 11:07 LAG2 9 0 4 3 +- 22 0 +- 15 1 7840 28 Dec 04 13:49 LAG1 17 0 14 11 +- 16 -6 +- 10 4 7840 28 Dec 04 15:01 LAG2 16 0 2 2 +- 16 0 +- 10 1 7840 28 Dec 04 17:13 LAG1 13 0 21 6 +- 22 -11 +- 10 5 7840 29 Dec 04 05:13 LAG2 9 0 7 -6 +- 22 2 +- 28 1 7840 29 Dec 04 05:23 LAG1 9 0 13 3 +- 22 -7 +- 13 4 7840 29 Dec 04 08:59 LAG1 11 0 7 -5 +- 19 -2 +- 10 1 7840 29 Dec 04 09:05 LAG2 13 0 9 0 +- 19 5 +- 11 2 7840 30 Dec 04 18:21 LAG1 13 0 8 12 +- 32 -4 +- 20 2 7840 31 Dec 04 13:17 LAG1 6 0 14 13 +- 58 -1 +- 48 2 7840 31 Dec 04 13:47 LAG2 8 0 19 7 +- 97 -15 +- 57 1 Station 7941 (Matera) (position solved, acc. 10 mm) 7941 27 Dec 04 14:51 LAG1 24 0 9 7 +- 8 3 +- 4 2 7941 27 Dec 04 17:21 LAG2 4 0 3 -3 +- 30 4 +- 100 1 7941 28 Dec 04 10:21 LAG1 5 0 21 0 +- 68 17 +- 53 2 7941 28 Dec 04 11:07 LAG2 12 0 3 -1 +- 15 2 +- 12 1 7941 29 Dec 04 09:27 LAG2 12 0 1 0 +- 28 0 +- 19 1 7941 30 Dec 04 14:59 LAG1 3 0 9 45 +- 752 -20 +- 282 0 7941 30 Dec 04 15:25 LAG2 5 0 9 -9 +- 20 -5 +- 16 1 -------------------------------------------------------------------------------- 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 - 041105 0/ 15/ 0 0/ 17/ 0 32 1831 LVIL 040815 - 041105 0/ 21/ 0 0/ 24/ 0 45 1864 MD2LAS 040701 - 041206 0/ 85/ 0 0/ 73/ 0 158 1873 SIMLAS 040703 - 040813 0/ 25/ 0 0/ 15/ 0 40 1884 RIGLAS 040712 - 041221 0/ 39/ 1 0/ 18/ 2 60 1893 CRMLAS 040705 - 041012 0/ 45/ 0 0/ 35/ 0 80 6405 TIGO 040710 - 041229 5/ 4/ 0 2/ 2/ 0 13 6810 ZIMLAT 040805 - 050101 135/ 81/ 14 73/ 88/ 13 404 7080 MLRS25 040701 - 041230 37/ 46/ 1 42/ 57/ 3 186 7090 ML0514 040716 - 050101 94/244/ 20 92/149/ 18 617 7105 ML0725 040701 - 041215 0/ 69/ 4 2/ 75/ 5 155 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 - 041231 0/126/ 0 0/133/ 1 260 7249 BEJLAS 040701 - 050101 0/ 71/ 0 0/ 88/ 0 159 7308 CRLLAS 041201 - 041222 2/ 6/ 1 2/ 6/ 0 17 7355 TROS02 040702 - 040829 0/ 37/ 0 0/ 29/ 0 66 7405 TIGO 040710 - 041124 2/ 6/ 0 0/ 3/ 0 11 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 - 050101 189/107/ 20 98/108/ 16 538 7811 POLLAS 040706 - 041215 0/ 48/ 0 0/ 56/ 0 104 7824 SPNLAS 040701 - 041227 0/ 81/ 0 0/ 77/ 0 158 7825 STL3 040807 - 050101 72/105/ 20 82/ 71/ 15 365 7832 SALRO 040702 - 050102 102/178/ 10 135/207/ 22 654 7835 GRASSE 040702 - 041222 0/ 36/ 0 0/ 26/ 1 63 7836 GFZLAS 040701 - 040701 0/ 1/ 0 0/ 0/ 0 1 7837 CHILAS 040704 - 041231 0/ 82/ 0 0/111/ 1 194 7838 SHOLAS 040701 - 041228 41/ 99/ 3 69/114/ 7 333 7839 AUSLAS 040701 - 041230 133/127/ 24 61/122/ 20 487 7840 RGOLAS 040701 - 050102 84/ 80/ 19 51/ 70/ 9 313 7841 GFZLA3 040702 - 041222 22/ 53/ 11 14/ 55/ 7 162 7845 GRASLL 040705 - 040920 11/ 14/ 0 3/ 12/ 1 41 7941 MLROnn 040701 - 041230 74/ 52/ 9 66/ 45/ 5 251 8834 WLRS01 040701 - 041221 170/109/ 19 96/120/ 15 529 -------------------------------------------------------------------------- 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) -------------------------------------------------------------- 041226.0 159.1 +/- 0.2 245.6 +/- 0.2 -32559.03 +/- 0.03 041227.0 157.0 +/- 0.1 245.2 +/- 0.1 -32558.83 +/- 0.03 041228.0 155.3 +/- 0.1 243.0 +/- 0.2 -32558.67 +/- 0.05 041229.0 153.1 +/- 0.1 241.5 +/- 0.2 -32558.55 +/- 0.06 041230.0 151.9 +/- 0.1 240.3 +/- 0.1 -32558.68 +/- 0.06 041231.0 150.2 +/- 0.2 238.5 +/- 0.3 -32559.02 +/- 0.07 050101.0 150.2 +/- 0.2 237.5 +/- 0.2 -32559.63 +/- 0.07 -------------------------------------------------------------- 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 ******************************************************************************** |