| Date: | 2006-04-25 13:15:00 | |
| Sender: | Ron Noomen <Ron Noomen <ron@astro.lr.tudelft.nl>> | |
| Subject: | [SLR-Report] No. 7030: Delft QL Report April 25, 2006 | |
| Author: | Ron Noomen | |
| Content: | ******************************************************************************** SLR Electronic Report 2006-04-25 13:15:00 UTC Message No. 7030 ******************************************************************************** Author: Ron Noomen Subject: Delft QL Report April 25, 2006 WEGENER-2 IERS REPORT OF THE QUICK-LOOK DATA ANALYSIS CENTER DELFT UNIVERSITY OF TECHNOLOGY FACULTY OF AEROSPACE ENGINEERING THE NETHERLANDS April 25, 2006 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, Apr 25, 2006. 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, Apr 25, 2006. 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) 060422 - 060422 1 - 1884 Riga, Latvia 060424 - 060424 1 1 6810 Zimmerwald 846, Switzerland 060423 - 060424 6 5 7090 Yarragadee, Australia 060423 - 060424 4 2 7105 Greenbelt, Maryland 060423 - 060423 2 - 7406 San Juan, Argentina 060423 - 060425 7 5 7501 Hartebeesthoek, SA (MOB-6) 060423 - 060424 4 3 7810 Zimmerwald 423, Switzerland 060423 - 060424 6 5 7811 Borowiec, Poland 060424 - 060424 1 1 7821 Shanghai Observatory, China 060424 - 060424 - 1 7824 San Fernando, Spain 060424 - 060424 1 - 7825 Mount Stromlo, Australia 060423 - 060424 6 6 7832 Riyad, Saudi Arabia 060423 - 060425 3 3 7838 Simosato Observatory, Japan 060424 - 060424 1 - 7839 Graz, Austria 060421 - 060425 2 4 7841 Potsdam, Germany 060424 - 060424 1 - 7941 Matera, Italy (MLRO 532) 060424 - 060425 4 4 8834 Wettzell, Germany 060423 - 060425 3 7 ------ ------ --- --- TOTAL 060421 - 060425 53 47 ------------------------------------------------------------------------------ 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, Apr 17, 2006 to Tue, Apr 25, 2006. 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 210/206 165/160 Number of Normal Points 2321/2266 2112/2068 Weighted RMS of Fit (mm) 13 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 1864 (Maidanak) (position fixed, acc. 200 mm) 1864 22 Apr 06 16:01 LAG1 8 0 62 -39 +- 515 10 +- 281 25 Station 1873 (Simeiz) (position fixed, acc. 200 mm) 1873 18 Apr 06 18:05 LAG1 11 0 67 27 +- 182 -5 +- 80 59 1873 19 Apr 06 20:27 LAG1 11 0 98 70 +- 183 -33 +- 209 56 Station 1884 (Riga) (position fixed, acc. 100 mm) 1884 19 Apr 06 20:34 LAG1 12 0 37 32 +- 88 -13 +- 89 8 1884 20 Apr 06 00:57 LAG2 12 0 84 79 +- 93 -13 +- 119 8 1884 22 Apr 06 20:13 LAG1 10 0 37 23 +- 206 9 +- 137 6 1884 24 Apr 06 01:21 LAG2 15 0 79 78 +- 77 -2 +- 80 8 1884 24 Apr 06 20:51 LAG1 14 0 13 12 +- 80 -5 +- 79 4 Station 6810 (Zimmerwald 846) (position fixed, acc. 60 mm) 6810 17 Apr 06 06:15 LAG2 26 0 18 9 +- 35 9 +- 22 6 6810 17 Apr 06 09:05 LAG1 13 0 18 17 +- 77 11 +- 39 11 6810 17 Apr 06 10:41 LAG2 5 0 29 37 +- 168 13 +- 232 2 6810 17 Apr 06 12:49 LAG1 6 0 18 -43 +- 211 -21 +- 133 8 6810 19 Apr 06 09:53 LAG1 11 0 15 15 +- 252 12 +- 105 2 6810 19 Apr 06 17:01 LAG1 18 0 4 0 +- 48 1 +- 27 2 6810 20 Apr 06 01:08 LAG2 3 0 13 8 +- 354 -19 +- 337 4 6810 20 Apr 06 04:35 LAG2 24 0 2 0 +- 37 0 +- 24 1 6810 20 Apr 06 08:31 LAG1 13 0 13 5 +- 55 -4 +- 27 4 6810 20 Apr 06 08:45 LAG2 10 0 8 3 +- 62 -3 +- 36 3 6810 20 Apr 06 12:05 LAG1 14 0 9 1 +- 50 -3 +- 20 2 6810 20 Apr 06 12:47 LAG2 6 0 18 9 +- 78 -7 +- 45 6 6810 20 Apr 06 15:35 LAG1 21 0 7 -3 +- 39 2 +- 23 5 6810 20 Apr 06 18:57 LAG1 22 0 9 0 +- 39 -3 +- 18 6 6810 20 Apr 06 22:39 LAG1 19 0 8 3 +- 42 -2 +- 33 7 6810 21 Apr 06 02:39 LAG2 15 0 6 0 +- 65 3 +- 45 4 6810 21 Apr 06 06:41 LAG2 18 0 5 1 +- 58 3 +- 39 2 6810 21 Apr 06 07:09 LAG1 8 0 13 -8 +- 68 3 +- 46 7 6810 21 Apr 06 10:41 LAG1 17 0 12 2 +- 44 3 +- 20 9 6810 21 Apr 06 10:58 LAG2 14 0 16 10 +- 51 -7 +- 25 3 6810 21 Apr 06 14:15 LAG1 19 0 8 -6 +- 42 0 +- 23 5 6810 21 Apr 06 17:39 LAG1 23 0 10 2 +- 38 -4 +- 19 5 6810 21 Apr 06 21:33 LAG1 12 0 10 3 +- 111 -7 +- 60 2 6810 22 Apr 06 00:53 LAG2 19 0 5 -1 +- 42 -3 +- 34 3 6810 22 Apr 06 04:47 LAG2 21 0 3 1 +- 43 0 +- 29 2 6810 22 Apr 06 08:55 LAG2 17 0 12 5 +- 45 -4 +- 24 5 6810 22 Apr 06 09:19 LAG1 18 0 12 3 +- 43 2 +- 19 9 6810 22 Apr 06 12:55 LAG1 15 0 12 5 +- 47 -6 +- 27 4 6810 22 Apr 06 12:59 LAG2 4 0 11 -37 +- 402 -17 +- 238 5 6810 23 Apr 06 11:07 LAG2 14 0 27 1 +- 53 -15 +- 30 5 6810 23 Apr 06 11:39 LAG1 13 0 16 10 +- 51 -5 +- 28 5 6810 23 Apr 06 15:03 LAG1 19 0 9 5 +- 41 -2 +- 25 5 6810 23 Apr 06 18:24 LAG1 26 0 25 0 +- 36 -11 +- 17 7 6810 23 Apr 06 21:59 LAG1 14 0 13 -2 +- 48 -7 +- 27 3 6810 24 Apr 06 01:03 LAG2 18 0 9 6 +- 43 5 +- 36 5 6810 24 Apr 06 05:03 LAG2 24 0 4 0 +- 37 2 +- 24 2 6810 24 Apr 06 09:09 LAG2 12 0 15 13 +- 62 -1 +- 31 4 6810 24 Apr 06 10:11 LAG1 15 0 10 7 +- 51 3 +- 23 6 6810 24 Apr 06 13:25 LAG2 4 0 7 -19 +- 282 -29 +- 440 4 6810 24 Apr 06 13:48 LAG1 13 0 17 16 +- 50 0 +- 39 6 Station 7090 (Yarragadee) (position fixed, acc. 10 mm) 7090 17 Apr 06 02:21 LAG1 12 0 12 -12 +- 12 -1 +- 6 2 7090 17 Apr 06 07:49 LAG2 21 0 7 -1 +- 10 4 +- 5 1 7090 17 Apr 06 11:55 LAG2 18 0 6 0 +- 10 0 +- 10 6 7090 17 Apr 06 15:01 LAG1 15 0 21 -19 +- 10 -4 +- 6 3 7090 17 Apr 06 16:07 LAG2 24 0 4 -3 +- 8 1 +- 4 3 7090 17 Apr 06 18:33 LAG1 8 0 11 8 +- 14 -9 +- 19 1 7090 17 Apr 06 20:21 LAG2 8 0 14 8 +- 15 -16 +- 17 0 7090 17 Apr 06 21:48 LAG1 10 0 4 3 +- 13 -5 +- 18 1 7090 18 Apr 06 01:07 LAG1 14 0 7 -5 +- 11 -1 +- 6 2 7090 18 Apr 06 06:00 LAG2 11 0 7 7 +- 13 0 +- 11 3 7090 18 Apr 06 09:49 LAG2 28 0 19 7 +- 7 -10 +- 4 3 7090 18 Apr 06 13:31 LAG1 19 0 9 -6 +- 10 1 +- 5 4 7090 18 Apr 06 14:22 LAG2 16 0 8 -3 +- 12 -4 +- 8 1 7090 18 Apr 06 17:11 LAG1 15 0 6 5 +- 10 -2 +- 8 1 7090 18 Apr 06 20:39 LAG1 8 0 7 -7 +- 22 3 +- 30 5 7090 18 Apr 06 23:45 LAG1 16 0 7 -6 +- 10 2 +- 5 1 7090 19 Apr 06 03:23 LAG1 11 0 9 -9 +- 13 3 +- 16 3 7090 19 Apr 06 12:07 LAG2 15 0 12 -7 +- 10 6 +- 7 1 7090 19 Apr 06 12:23 LAG1 12 0 6 -4 +- 13 -2 +- 10 3 7090 19 Apr 06 15:47 LAG1 18 0 3 0 +- 9 0 +- 6 2 7090 19 Apr 06 16:29 LAG2 14 0 6 2 +- 12 6 +- 11 0 7090 19 Apr 06 19:27 LAG1 5 0 18 23 +- 40 -9 +- 60 2 7090 19 Apr 06 22:25 LAG1 15 0 10 2 +- 10 7 +- 7 2 7090 20 Apr 06 01:53 LAG1 13 0 9 2 +- 11 3 +- 5 1 7090 20 Apr 06 10:07 LAG2 26 0 6 -5 +- 8 0 +- 5 2 7090 20 Apr 06 14:47 LAG2 8 0 7 4 +- 21 5 +- 29 1 7090 21 Apr 06 08:21 LAG2 15 0 7 5 +- 12 -4 +- 7 1 7090 21 Apr 06 12:25 LAG2 11 0 8 -1 +- 31 5 +- 25 1 7090 21 Apr 06 13:03 LAG1 12 0 5 -2 +- 17 -4 +- 14 3 7090 22 Apr 06 03:01 LAG1 3 0 3 1 +- 141 2 +- 164 1 7090 22 Apr 06 18:51 LAG1 6 0 8 -7 +- 20 -3 +- 44 1 7090 22 Apr 06 19:05 LAG2 13 0 4 0 +- 22 -3 +- 19 2 7090 22 Apr 06 22:13 LAG1 7 0 6 2 +- 48 -6 +- 36 2 7090 23 Apr 06 01:27 LAG1 8 0 10 -4 +- 15 11 +- 18 1 7090 23 Apr 06 08:46 LAG2 5 0 10 2 +- 36 -7 +- 23 2 7090 23 Apr 06 12:37 LAG2 26 0 13 -2 +- 8 -8 +- 5 1 7090 23 Apr 06 13:45 LAG1 22 0 9 -7 +- 8 -1 +- 4 3 7090 23 Apr 06 16:53 LAG2 25 0 9 0 +- 8 -5 +- 5 1 7090 23 Apr 06 17:41 LAG1 4 0 6 -3 +- 92 -2 +- 95 2 7090 23 Apr 06 20:43 LAG1 5 0 6 -12 +- 50 -11 +- 68 3 7090 23 Apr 06 23:57 LAG1 16 0 8 -8 +- 10 0 +- 7 2 Station 7105 (Greenbelt) (position fixed, acc. 10 mm) 7105 18 Apr 06 07:53 LAG2 20 0 6 -4 +- 9 -3 +- 7 1 7105 18 Apr 06 12:07 LAG2 16 0 17 -2 +- 10 -16 +- 10 0 7105 18 Apr 06 15:35 LAG1 9 0 3 1 +- 18 -1 +- 19 3 7105 18 Apr 06 16:23 LAG2 5 0 7 -18 +- 49 -17 +- 55 1 7105 19 Apr 06 05:35 LAG1 3 0 15 -9 +- 155 -9 +- 266 1 7105 19 Apr 06 06:03 LAG2 13 0 13 9 +- 11 6 +- 10 3 7105 20 Apr 06 08:05 LAG2 14 0 12 8 +- 17 -3 +- 13 2 7105 20 Apr 06 12:09 LAG2 15 0 5 -2 +- 18 -4 +- 13 2 7105 20 Apr 06 16:15 LAG1 5 0 4 4 +- 69 0 +- 49 2 7105 23 Apr 06 19:25 LAG1 2 0 19 -55 +- 420 38 +- 437 0 7105 23 Apr 06 22:33 LAG1 6 0 22 -21 +- 17 0 +- 21 5 Station 7110 (Monument Peak) (position fixed, acc. 10 mm) 7110 17 Apr 06 01:05 LAG1 15 0 6 -3 +- 10 1 +- 9 4 7110 17 Apr 06 04:31 LAG1 5 0 6 18 +- 85 8 +- 52 2 7110 17 Apr 06 22:25 LAG2 4 0 7 24 +- 136 -21 +- 99 3 7110 18 Apr 06 00:09 LAG1 2 0 19 -59 +- 304 39 +- 295 0 7110 18 Apr 06 03:03 LAG1 13 0 5 2 +- 11 0 +- 5 4 7110 18 Apr 06 06:37 LAG1 19 0 7 6 +- 9 1 +- 7 1 7110 18 Apr 06 12:07 LAG2 11 0 18 30 +- 59 -24 +- 30 2 7110 18 Apr 06 15:59 LAG2 11 0 19 11 +- 14 -16 +- 20 1 7110 18 Apr 06 19:07 LAG1 11 0 7 0 +- 13 -3 +- 6 2 7110 18 Apr 06 22:47 LAG1 3 0 18 -20 +- 63 5 +- 128 0 7110 19 Apr 06 01:57 LAG1 8 0 9 -6 +- 18 0 +- 13 6 7110 19 Apr 06 05:15 LAG1 21 0 8 0 +- 9 -4 +- 5 2 7110 19 Apr 06 09:41 LAG2 15 0 17 -4 +- 10 9 +- 6 4 7110 19 Apr 06 13:53 LAG2 18 0 11 11 +- 10 -1 +- 7 3 7110 19 Apr 06 17:55 LAG1 9 0 3 -2 +- 15 1 +- 15 1 7110 19 Apr 06 18:23 LAG2 9 0 8 -7 +- 15 -2 +- 21 1 7110 19 Apr 06 21:31 LAG1 7 0 5 -1 +- 40 4 +- 31 3 7110 19 Apr 06 22:37 LAG2 3 0 6 14 +- 193 -17 +- 180 4 7110 20 Apr 06 00:50 LAG1 2 0 38 -14 +- 89 -24 +- 94 0 7110 20 Apr 06 03:47 LAG1 14 0 21 23 +- 19 1 +- 10 3 7110 20 Apr 06 07:39 LAG1 5 0 22 -15 +- 19 -15 +- 25 1 7110 20 Apr 06 08:05 LAG2 3 0 13 -71 +- 136 -122 +- 243 3 7110 20 Apr 06 12:05 LAG2 11 0 9 6 +- 18 -6 +- 10 3 7110 20 Apr 06 16:17 LAG2 10 0 13 9 +- 14 -10 +- 11 3 7110 20 Apr 06 20:01 LAG1 15 0 5 4 +- 12 -3 +- 8 2 7110 21 Apr 06 22:07 LAG1 10 0 6 -2 +- 14 -4 +- 17 3 7110 22 Apr 06 01:21 LAG1 10 1 29 -27 +- 14 2 +- 16 7 7110 22 Apr 06 04:35 LAG1 16 0 19 3 +- 10 7 +- 4 6 Station 7124 (Papeete) (position fixed, acc. 10 mm) 7124 20 Apr 06 11:23 LAG2 12 0 38 30 +- 15 6 +- 9 5 Station 7249 (Beijing) (position solved, acc. 50 mm) 7249 19 Apr 06 12:51 LAG1 13 0 10 0 +- 46 0 +- 26 10 Station 7308 (Tokyo) (position fixed, acc. 50 mm) 7308 17 Apr 06 03:46 LAG2 5 0 54 -64 +- 482 62 +- 258 5 7308 17 Apr 06 12:16 LAG1 7 0 11 5 +- 154 2 +- 97 4 7308 20 Apr 06 08:11 LAG1 7 0 22 -23 +- 72 7 +- 100 7 7308 20 Apr 06 11:35 LAG1 16 0 18 -9 +- 58 12 +- 30 6 7308 20 Apr 06 15:41 LAG2 10 0 19 -3 +- 83 -19 +- 98 4 Station 7406 (San Juan) (position solved, acc. 100 mm) 7406 17 Apr 06 00:17 LAG1 9 0 47 -47 +- 102 2 +- 204 4 7406 17 Apr 06 00:49 LAG2 20 0 39 29 +- 69 24 +- 50 8 7406 17 Apr 06 05:20 LAG2 4 0 81 -15 +- 286 125 +- 530 1 7406 17 Apr 06 07:17 LAG1 5 0 103 -47 +- 137 220 +- 366 8 7406 17 Apr 06 22:57 LAG2 16 0 20 20 +- 77 -9 +- 55 1 7406 18 Apr 06 02:13 LAG1 15 0 22 -32 +- 116 -12 +- 69 3 7406 18 Apr 06 03:03 LAG2 15 0 11 -14 +- 144 -3 +- 91 5 7406 18 Apr 06 05:43 LAG1 15 0 10 -4 +- 85 -5 +- 57 7 7406 18 Apr 06 07:07 LAG2 26 0 21 -5 +- 59 14 +- 42 6 7406 18 Apr 06 09:13 LAG1 11 0 64 -17 +- 93 85 +- 119 3 7406 19 Apr 06 00:53 LAG1 4 0 16 -136 +-2078 -67 +-1136 0 7406 19 Apr 06 01:25 LAG2 10 0 32 29 +- 112 6 +- 161 1 7406 19 Apr 06 04:23 LAG1 16 0 45 11 +- 75 24 +- 41 6 7406 19 Apr 06 05:21 LAG2 15 0 53 -32 +- 77 31 +- 62 8 7406 19 Apr 06 23:09 LAG2 15 0 33 34 +- 91 3 +- 85 3 7406 20 Apr 06 07:25 LAG2 3 0 62 97 +-4016 96 +-2424 2 7406 21 Apr 06 01:25 LAG2 12 0 34 19 +- 120 -16 +- 110 4 7406 21 Apr 06 01:51 LAG1 7 0 59 -60 +- 196 -1 +- 208 3 7406 21 Apr 06 23:23 LAG2 18 0 35 34 +- 75 -1 +- 67 1 7406 22 Apr 06 00:19 LAG1 17 0 38 -39 +- 76 -6 +- 72 8 7406 22 Apr 06 03:39 LAG2 8 0 72 -33 +- 424 23 +- 255 1 7406 22 Apr 06 04:05 LAG1 10 0 80 -3 +- 102 78 +- 98 2 7406 22 Apr 06 07:23 LAG1 8 0 85 35 +- 135 144 +- 189 1 7406 23 Apr 06 01:37 LAG2 13 0 62 29 +- 91 58 +- 79 10 7406 23 Apr 06 02:35 LAG1 7 0 48 153 +- 361 94 +- 221 3 7406 23 Apr 06 06:11 LAG1 7 0 99 -9 +- 113 184 +- 211 2 7406 23 Apr 06 09:19 LAG1 2 0 297 -106 +-9999 125 +-7198 0 7406 23 Apr 06 23:31 LAG2 19 0 194 203 +- 73 21 +- 44 8*CHK* 7406 24 Apr 06 01:03 LAG1 12 0 209 194 +- 87 47 +- 39 8*CHK* 7406 24 Apr 06 03:45 LAG2 15 0 176 4 +- 183 101 +- 102 8 7406 24 Apr 06 04:43 LAG1 20 0 265 24 +- 69 155 +- 42 4 7406 24 Apr 06 07:55 LAG2 6 0 128 23 +- 466 171 +- 528 3 7406 24 Apr 06 08:17 LAG1 8 0 229 27 +- 196 222 +- 212 4 Station 7501 (Hartebeesthoek) (position fixed, acc. 10 mm) 7501 17 Apr 06 19:17 LAG1 4 0 9 4 +- 63 3 +- 43 0 7501 17 Apr 06 19:37 LAG2 21 0 16 14 +- 9 10 +- 8 3 7501 19 Apr 06 20:01 LAG2 16 0 26 23 +- 10 12 +- 12 2 7501 19 Apr 06 23:36 LAG1 4 0 16 59 +- 129 -29 +- 82 0 7501 20 Apr 06 17:55 LAG2 5 0 3 16 +- 106 13 +- 100 2 7501 23 Apr 06 16:07 LAG2 17 0 19 14 +- 10 7 +- 8 3 7501 23 Apr 06 17:47 LAG1 15 0 7 -4 +- 10 -5 +- 10 2 7501 23 Apr 06 20:27 LAG2 18 0 23 12 +- 10 10 +- 6 3 7501 23 Apr 06 21:15 LAG1 15 0 11 0 +- 11 -5 +- 5 2 7501 24 Apr 06 00:39 LAG2 17 0 12 11 +- 13 1 +- 11 1 7501 24 Apr 06 03:59 LAG1 11 0 11 9 +- 12 9 +- 15 4 7501 24 Apr 06 07:21 LAG1 3 0 17 38 +- 172 28 +- 89 5 Station 7810 (Zimmerwald 423) (position fixed, acc. 60 mm) 7810 17 Apr 06 06:17 LAG2 26 0 23 19 +- 35 6 +- 22 6 7810 17 Apr 06 09:07 LAG1 11 0 20 49 +- 140 21 +- 76 3 7810 17 Apr 06 10:41 LAG2 5 0 35 38 +- 167 5 +- 231 1 7810 17 Apr 06 12:49 LAG1 5 0 5 7 +- 400 1 +- 232 1 7810 19 Apr 06 09:59 LAG1 4 0 5 61 +-1557 25 +- 615 1 7810 19 Apr 06 17:01 LAG1 17 0 15 12 +- 48 2 +- 29 2 7810 20 Apr 06 01:09 LAG2 3 0 5 16 +- 336 -13 +- 308 0 7810 20 Apr 06 04:41 LAG2 20 0 11 11 +- 41 0 +- 30 3 7810 20 Apr 06 08:41 LAG1 5 0 29 26 +- 218 -2 +- 153 3 7810 20 Apr 06 08:55 LAG2 7 0 22 21 +- 69 -4 +- 44 3 7810 20 Apr 06 12:15 LAG1 5 0 21 15 +- 82 -5 +- 38 4 7810 20 Apr 06 12:57 LAG2 4 0 21 19 +- 93 -5 +- 61 6 7810 20 Apr 06 15:37 LAG1 16 0 12 9 +- 47 2 +- 31 5 7810 20 Apr 06 18:59 LAG1 17 0 17 15 +- 44 -2 +- 24 4 7810 20 Apr 06 22:40 LAG1 17 0 18 18 +- 44 -3 +- 38 2 7810 21 Apr 06 02:41 LAG2 14 0 9 10 +- 66 1 +- 48 2 7810 21 Apr 06 06:42 LAG2 18 0 18 18 +- 51 1 +- 36 3 7810 21 Apr 06 07:15 LAG1 4 0 10 23 +- 283 13 +- 256 2 7810 21 Apr 06 10:43 LAG1 14 0 22 19 +- 49 4 +- 24 7 7810 21 Apr 06 10:58 LAG2 8 0 22 21 +- 69 -7 +- 35 7 7810 21 Apr 06 14:17 LAG1 17 0 8 7 +- 44 1 +- 26 4 7810 21 Apr 06 17:39 LAG1 22 0 16 13 +- 39 -4 +- 19 4 7810 21 Apr 06 21:33 LAG1 11 0 9 18 +- 113 -8 +- 65 2 7810 22 Apr 06 00:55 LAG2 17 0 10 9 +- 44 -3 +- 39 3 7810 22 Apr 06 04:49 LAG2 18 0 15 14 +- 48 -1 +- 33 2 7810 22 Apr 06 08:59 LAG2 12 0 27 20 +- 61 -6 +- 40 4 7810 22 Apr 06 09:21 LAG1 13 0 21 18 +- 51 2 +- 25 12 7810 22 Apr 06 13:01 LAG2 2 0 6 37 +- 744 21 +- 450 0 7810 22 Apr 06 13:03 LAG1 12 0 15 14 +- 55 -7 +- 39 3 7810 23 Apr 06 11:07 LAG2 11 0 38 17 +- 150 -12 +- 91 2 7810 23 Apr 06 11:39 LAG1 12 0 27 23 +- 52 -6 +- 28 5 7810 23 Apr 06 15:03 LAG1 19 0 17 16 +- 41 -1 +- 25 6 7810 23 Apr 06 18:25 LAG1 24 0 23 11 +- 37 -9 +- 18 6 7810 23 Apr 06 22:05 LAG1 10 0 12 7 +- 59 -6 +- 38 3 7810 24 Apr 06 01:09 LAG2 14 0 19 18 +- 48 4 +- 49 4 7810 24 Apr 06 05:03 LAG2 22 0 12 12 +- 39 1 +- 26 3 7810 24 Apr 06 09:09 LAG2 12 0 23 21 +- 80 -1 +- 40 4 7810 24 Apr 06 10:11 LAG1 15 0 17 16 +- 48 3 +- 22 6 7810 24 Apr 06 13:24 LAG2 4 0 8 6 +- 269 -3 +- 411 0 7810 24 Apr 06 13:49 LAG1 12 0 21 20 +- 52 1 +- 39 3 Station 7811 (Borowiec) (position fixed, acc. 60 mm) 7811 20 Apr 06 19:09 LAG1 12 0 45 43 +- 53 -2 +- 39 13 7811 24 Apr 06 01:33 LAG2 4 0 31 29 +- 198 -1 +- 339 12 7811 24 Apr 06 20:49 LAG1 13 0 21 18 +- 53 -9 +- 47 11 Station 7821 (Shanghai Observatory) (position solved, acc. 50 mm) 7821 17 Apr 06 12:17 LAG1 7 0 6 7 +- 121 -3 +- 93 4 7821 24 Apr 06 20:07 LAG2 5 0 9 -36 +- 347 24 +- 258 4 Station 7824 (San Fernando) (position fixed, acc. 40 mm) 7824 17 Apr 06 19:50 LAG1 1 0 48 0 +- 0 0 +- 0 0 7824 19 Apr 06 20:29 LAG1 16 0 28 28 +- 31 -4 +- 20 5 7824 20 Apr 06 22:37 LAG1 3 0 35 87 +-3036 26 +-1559 0 7824 24 Apr 06 20:35 LAG1 6 0 57 78 +- 381 8 +- 159 1 Station 7825 (Mount Stromlo) (position solved, acc. 10 mm) 7825 17 Apr 06 03:59 LAG2 22 0 6 2 +- 8 3 +- 6 3 7825 17 Apr 06 08:01 LAG2 25 0 10 -6 +- 8 -4 +- 5 4 7825 17 Apr 06 11:17 LAG1 17 0 13 -3 +- 10 8 +- 6 4 7825 17 Apr 06 12:20 LAG2 22 0 10 -6 +- 9 7 +- 6 4 7825 17 Apr 06 14:49 LAG1 7 0 17 -16 +- 16 -4 +- 11 5 7825 17 Apr 06 16:22 LAG2 8 0 5 -4 +- 14 -1 +- 19 1 7825 18 Apr 06 01:00 LAG1 12 1 10 2 +- 12 7 +- 12 6 7825 18 Apr 06 06:29 LAG2 9 0 9 15 +- 40 -5 +- 24 3 7825 18 Apr 06 09:57 LAG1 13 0 12 5 +- 11 -11 +- 15 6 7825 18 Apr 06 10:27 LAG2 15 0 17 9 +- 12 -17 +- 11 4 7825 18 Apr 06 13:29 LAG1 20 0 16 -16 +- 9 4 +- 5 6 7825 18 Apr 06 14:29 LAG2 19 0 11 -2 +- 9 -6 +- 6 3 7825 18 Apr 06 16:55 LAG1 14 0 4 0 +- 11 1 +- 10 4 7825 18 Apr 06 20:07 LAG1 17 0 3 -2 +- 10 0 +- 6 2 7825 19 Apr 06 04:10 LAG2 21 0 13 10 +- 9 4 +- 6 2 7825 19 Apr 06 08:11 LAG2 27 0 7 4 +- 8 3 +- 5 2 7825 19 Apr 06 11:58 LAG1 10 0 6 -9 +- 37 -3 +- 19 4 7825 19 Apr 06 12:35 LAG2 17 0 8 2 +- 12 3 +- 7 2 7825 19 Apr 06 15:35 LAG1 16 0 16 13 +- 10 4 +- 8 7 7825 19 Apr 06 16:33 LAG2 19 0 11 8 +- 9 6 +- 8 3 7825 19 Apr 06 18:55 LAG1 13 0 21 20 +- 11 3 +- 12 6 7825 19 Apr 06 22:31 LAG1 2 0 20 21 +- 31 -76 +- 270 0 7825 20 Apr 06 06:25 LAG2 21 0 10 6 +- 9 1 +- 6 7 7825 20 Apr 06 10:29 LAG2 16 0 6 -1 +- 10 -1 +- 6 5 7825 20 Apr 06 10:55 LAG1 7 0 3 3 +- 17 -5 +- 28 1 7825 20 Apr 06 14:12 LAG1 16 0 12 -10 +- 10 -5 +- 7 5 7825 20 Apr 06 14:45 LAG2 21 1 3 1 +- 10 0 +- 6 3 7825 21 Apr 06 04:32 LAG2 14 0 15 11 +- 11 0 +- 7 9 7825 21 Apr 06 08:29 LAG2 2 0 17 67 +-1766 23 +- 834 0 7825 21 Apr 06 12:39 LAG2 14 0 6 3 +- 12 2 +- 6 3 7825 21 Apr 06 13:04 LAG1 8 0 16 -15 +- 15 -3 +- 17 2 7825 21 Apr 06 16:21 LAG1 13 0 7 -4 +- 11 -4 +- 10 3 7825 21 Apr 06 16:51 LAG2 13 0 13 4 +- 11 8 +- 12 9 7825 21 Apr 06 19:55 LAG1 8 0 10 -5 +- 36 -2 +- 27 5 7825 21 Apr 06 23:15 LAG1 9 0 8 -1 +- 18 4 +- 9 3 7825 22 Apr 06 06:43 LAG2 14 0 10 9 +- 12 -2 +- 8 4 7825 22 Apr 06 10:55 LAG2 17 0 7 -5 +- 10 0 +- 9 4 7825 22 Apr 06 11:28 LAG1 14 0 10 -8 +- 11 -1 +- 6 5 7825 22 Apr 06 14:50 LAG2 15 0 5 0 +- 10 1 +- 5 4 7825 22 Apr 06 15:09 LAG1 7 0 16 -16 +- 17 -11 +- 23 5 7825 22 Apr 06 21:53 LAG1 8 0 7 -3 +- 15 8 +- 18 4 7825 23 Apr 06 04:47 LAG2 16 0 10 11 +- 11 -3 +- 6 3 7825 23 Apr 06 08:43 LAG2 20 0 20 4 +- 9 -12 +- 5 3 7825 23 Apr 06 10:06 LAG1 14 0 8 7 +- 11 -2 +- 8 2 7825 23 Apr 06 12:54 LAG2 10 0 18 -2 +- 14 -13 +- 9 3 7825 23 Apr 06 13:51 LAG1 7 0 13 -12 +- 15 -2 +- 18 3 7825 23 Apr 06 23:47 LAG1 20 1 10 -1 +- 9 5 +- 6 6 7825 24 Apr 06 06:49 LAG2 23 0 4 2 +- 8 1 +- 5 3 7825 24 Apr 06 10:57 LAG2 24 0 4 0 +- 8 2 +- 5 2 7825 24 Apr 06 12:13 LAG1 24 0 10 -9 +- 8 1 +- 4 4 7825 24 Apr 06 15:03 LAG2 16 0 6 5 +- 10 4 +- 9 2 7825 24 Apr 06 15:53 LAG1 6 0 7 5 +- 17 -3 +- 27 2 7825 24 Apr 06 22:34 LAG1 4 0 20 -12 +- 47 5 +- 33 6 Station 7832 (Riyad) (position solved, acc. 20 mm) 7832 18 Apr 06 04:54 LAG2 9 0 17 12 +- 22 15 +- 50 5 7832 18 Apr 06 18:05 LAG1 9 0 10 -8 +- 25 1 +- 12 7 7832 18 Apr 06 22:45 LAG2 9 0 9 -4 +- 23 -8 +- 38 5 7832 19 Apr 06 02:46 LAG2 10 0 20 10 +- 21 15 +- 22 3 7832 19 Apr 06 06:41 LAG1 9 0 4 -3 +- 22 0 +- 21 3 7832 19 Apr 06 07:31 LAG2 7 2 28 23 +- 183 3 +- 132 6 7832 19 Apr 06 16:39 LAG1 13 0 20 -17 +- 18 6 +- 14 4 7832 20 Apr 06 05:23 LAG2 6 0 2 2 +- 88 0 +- 105 1 7832 20 Apr 06 15:37 LAG1 7 0 8 -25 +- 81 17 +- 55 4 7832 20 Apr 06 18:57 LAG1 7 0 10 7 +- 28 3 +- 37 5 7832 21 Apr 06 21:05 LAG2 11 0 11 10 +- 21 1 +- 37 2 7832 22 Apr 06 06:19 LAG1 7 4 16 -39 +- 160 32 +- 143 13 7832 22 Apr 06 16:11 LAG1 6 0 8 2 +- 33 11 +- 46 5 7832 22 Apr 06 20:06 LAG1 2 0 14 -102 +-1360 54 +- 626 0 7832 23 Apr 06 03:30 LAG2 6 0 20 -22 +- 59 2 +- 77 4 7832 23 Apr 06 14:51 LAG1 12 0 3 -1 +- 19 2 +- 21 2 7832 23 Apr 06 18:09 LAG1 9 0 14 4 +- 54 -5 +- 30 5 7832 24 Apr 06 06:55 LAG1 5 0 20 -2 +- 76 17 +- 70 0 7832 24 Apr 06 23:28 LAG2 8 0 7 6 +- 35 -1 +- 35 4 Station 7838 (Simosato Observatory) (position fixed, acc. 30 mm) 7838 17 Apr 06 02:19 LAG1 4 0 22 133 +- 823 -42 +- 316 2 7838 17 Apr 06 03:48 LAG2 5 0 56 15 +- 358 19 +- 175 3 7838 20 Apr 06 01:33 LAG2 5 0 48 44 +- 43 5 +- 21 9 7838 21 Apr 06 03:25 LAG1 6 0 32 34 +- 42 -4 +- 20 5 7838 21 Apr 06 09:59 LAG1 21 0 71 66 +- 21 9 +- 11 12 7838 21 Apr 06 13:34 LAG1 17 0 29 20 +- 23 15 +- 17 5 7838 21 Apr 06 17:21 LAG2 24 0 62 57 +- 19 12 +- 13 10 7838 24 Apr 06 09:33 LAG1 15 0 65 63 +- 24 8 +- 18 5 Station 7839 (Graz) (position fixed, acc. 10 mm) 7839 20 Apr 06 08:41 LAG1 5 0 11 5 +- 87 -4 +- 55 0 7839 20 Apr 06 08:57 LAG2 5 0 5 2 +- 19 -3 +- 14 0 7839 20 Apr 06 19:01 LAG1 12 0 8 0 +- 12 -3 +- 5 1 7839 21 Apr 06 02:42 LAG2 15 0 8 -1 +- 10 3 +- 6 3 7839 21 Apr 06 07:02 LAG2 9 0 2 1 +- 14 1 +- 13 0 7839 21 Apr 06 10:47 LAG1 3 0 6 -37 +- 707 -12 +- 274 0 7839 21 Apr 06 21:23 LAG1 5 0 4 -6 +- 26 -6 +- 37 0 7839 22 Apr 06 00:57 LAG2 9 0 3 -3 +- 15 -2 +- 12 0 7839 22 Apr 06 19:47 LAG1 16 0 4 -3 +- 10 0 +- 4 2 7839 22 Apr 06 23:23 LAG2 6 0 17 16 +- 18 4 +- 62 0 Station 7840 (Herstmonceux) (position fixed, acc. 20 mm) 7840 17 Apr 06 19:41 LAG1 19 0 7 0 +- 15 -4 +- 8 2 7840 17 Apr 06 23:23 LAG1 15 0 3 0 +- 17 1 +- 18 3 7840 18 Apr 06 04:23 LAG2 20 0 16 -3 +- 14 11 +- 10 2 7840 18 Apr 06 08:31 LAG2 15 0 15 13 +- 17 -4 +- 13 2 7840 18 Apr 06 11:31 LAG1 9 0 10 5 +- 22 -4 +- 14 2 7840 18 Apr 06 12:37 LAG2 9 0 22 8 +- 36 -14 +- 35 2 7840 18 Apr 06 14:59 LAG1 11 0 10 -10 +- 20 2 +- 12 2 7840 18 Apr 06 18:21 LAG1 13 0 8 -3 +- 18 -3 +- 11 2 7840 19 Apr 06 20:35 LAG1 15 0 12 -9 +- 18 -2 +- 10 2 7840 22 Apr 06 08:57 LAG2 15 0 7 3 +- 17 -3 +- 13 2 7840 22 Apr 06 09:35 LAG1 5 0 17 19 +- 34 5 +- 50 2 7840 22 Apr 06 13:06 LAG1 9 0 11 6 +- 24 -9 +- 19 1 7840 22 Apr 06 13:09 LAG2 4 0 14 -18 +- 100 -7 +- 146 0 7840 22 Apr 06 16:29 LAG1 16 0 7 6 +- 16 -1 +- 11 3 7840 22 Apr 06 19:53 LAG1 19 0 5 -4 +- 15 0 +- 7 3 Station 7841 (Potsdam) (position solved, acc. 10 mm) 7841 17 Apr 06 20:03 LAG1 10 0 8 2 +- 56 -4 +- 24 4 7841 19 Apr 06 20:39 LAG1 8 0 17 0 +- 14 17 +- 20 10 7841 20 Apr 06 19:25 LAG1 6 0 5 0 +- 44 3 +- 30 3 7841 24 Apr 06 21:13 LAG1 3 0 6 28 +- 355 -11 +- 181 1 Station 7941 (Matera) (position solved, acc. 10 mm) 7941 18 Apr 06 11:23 LAG1 11 0 5 1 +- 24 3 +- 14 2 7941 18 Apr 06 14:53 LAG1 8 0 9 0 +- 23 10 +- 24 2 7941 19 Apr 06 13:31 LAG1 6 0 17 -13 +- 71 1 +- 44 5 7941 19 Apr 06 16:49 LAG1 21 0 11 4 +- 9 5 +- 5 3 7941 19 Apr 06 20:35 LAG1 14 0 3 5 +- 18 -2 +- 10 1 7941 20 Apr 06 08:41 LAG1 2 0 22 -24 +-1762 -20 +- 750 0 7941 20 Apr 06 19:19 LAG1 9 0 7 14 +- 39 -8 +- 18 3 7941 21 Apr 06 21:07 LAG1 19 0 7 -7 +- 9 -1 +- 6 2 7941 22 Apr 06 00:49 LAG2 21 0 4 -3 +- 9 1 +- 7 1 7941 24 Apr 06 09:17 LAG2 10 0 8 16 +- 54 5 +- 29 3 7941 24 Apr 06 10:15 LAG1 6 0 4 27 +- 127 11 +- 54 1 7941 24 Apr 06 13:47 LAG1 9 0 15 14 +- 19 0 +- 19 6 7941 24 Apr 06 17:01 LAG1 12 0 7 -2 +- 22 2 +- 12 2 7941 24 Apr 06 20:43 LAG1 13 0 10 0 +- 12 -5 +- 7 3 7941 24 Apr 06 23:21 LAG2 6 0 19 28 +- 48 13 +- 64 1 Station 8834 (Wettzell) (position fixed, acc. 10 mm) 8834 19 Apr 06 06:59 LAG2 2 0 95 28 +- 125 237 +- 437 0 8834 20 Apr 06 05:09 LAG2 5 0 19 -43 +- 93 18 +- 67 3 8834 20 Apr 06 08:47 LAG1 5 0 7 -9 +- 33 -8 +- 47 5 8834 20 Apr 06 09:03 LAG2 3 0 5 3 +- 78 -4 +- 137 1 8834 21 Apr 06 02:49 LAG2 10 0 19 -9 +- 27 7 +- 21 3 8834 21 Apr 06 06:52 LAG2 9 0 9 1 +- 41 7 +- 27 3 8834 21 Apr 06 07:25 LAG1 3 0 20 -22 +- 57 -11 +- 214 0 8834 21 Apr 06 11:03 LAG2 6 0 11 8 +- 56 -1 +- 46 6 8834 21 Apr 06 21:33 LAG1 2 0 20 -26 +- 42 83 +- 330 0 8834 22 Apr 06 04:59 LAG2 15 0 9 -8 +- 10 3 +- 8 2 8834 22 Apr 06 09:11 LAG2 5 0 4 8 +- 47 8 +- 42 3 8834 23 Apr 06 07:19 LAG2 2 0 9 -34 +- 330 -28 +- 374 0 8834 23 Apr 06 11:08 LAG2 4 4 0 0 +- 0 0 +- 0 0 8834 23 Apr 06 22:11 LAG1 9 0 235 1 +- 19 -286 +- 23 3*CHK* 8834 24 Apr 06 01:41 LAG2 6 0 510 -48 +- 122 -265 +- 70 8*CHK* 8834 24 Apr 06 05:01 LAG2 22 0 10 -5 +- 9 4 +- 5 3 8834 24 Apr 06 09:25 LAG2 9 0 598 0 +- 17 692 +- 20 3*CHK* 8834 24 Apr 06 10:23 LAG1 2 0 1030 -15 +- 993 691 +- 677 0 8834 24 Apr 06 20:51 LAG1 9 0 1363 -14 +- 18 689 +- 9 5*CHK* 8834 24 Apr 06 23:51 LAG2 5 0 873 7 +- 135 695 +- 109 2*CHK* -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------- 1864 MD2LAS 060104 - 060422 0/ 36/ 0 0/ 13/ 0 49 1873 SIMLAS 060328 - 060419 0/ 7/ 0 0/ 1/ 0 8 1884 RIGLAS 060112 - 060424 0/ 31/ 0 0/ 8/ 0 39 1893 CRMLAS 060113 - 060402 0/ 8/ 0 0/ 0/ 0 8 6405 TIGO 060103 - 060309 20/ 44/ 1 14/ 47/ 9 135 6810 ZIMLAT 060103 - 060424 85/ 81/ 8 78/ 47/ 7 306 7080 MLRS25 060102 - 060416 1/ 45/ 1 4/ 29/ 1 81 7090 ML0514 060101 - 060424 145/165/ 13 80/176/ 17 596 7105 ML0725 060106 - 060423 11/ 63/ 2 11/ 23/ 2 112 7110 ML0414 060103 - 060422 43/ 62/ 5 46/ 31/ 6 193 7124 ML0819 060225 - 060420 0/ 26/ 0 0/ 15/ 0 41 7130 TL04** 060125 - 060316 9/ 9/ 0 3/ 4/ 2 27 7237 CHALAS 060101 - 060405 0/ 94/ 0 0/ 44/ 0 138 7249 BEJLAS 060104 - 060419 0/ 50/ 0 0/ 14/ 0 64 7308 CRLLAS 060110 - 060420 5/ 15/ 0 5/ 13/ 0 38 7358 GMSL 060111 - 060416 1/ 10/ 0 1/ 7/ 0 19 7405 TIGO 060103 - 060302 0/ 9/ 0 0/ 5/ 0 14 7406 060223 - 060425 0/ 99/ 0 0/103/ 0 202 7501 ML0616 060117 - 060424 13/ 40/ 1 5/ 49/ 3 111 7810 ZIMLAT 060103 - 060424 85/ 84/ 8 76/ 48/ 6 307 7811 POLLAS 060109 - 060424 0/ 29/ 0 0/ 6/ 0 35 7821 CHILAS 060106 - 060424 0/ 14/ 0 0/ 8/ 0 22 7824 SPNLAS 060109 - 060424 0/ 60/ 0 0/ 20/ 1 81 7825 STL3 060102 - 060424 91/103/ 10 70/138/ 10 422 7832 SALRO 060103 - 060425 49/ 89/ 4 70/ 51/ 6 269 7838 SHOLAS 060105 - 060424 28/ 70/ 1 33/ 31/ 4 167 7839 AUSLAS 060109 - 060425 57/ 64/ 4 59/ 29/ 5 218 7840 RGOLAS 060104 - 060422 58/ 71/ 8 58/ 23/ 6 224 7841 GFZLA3 060107 - 060424 10/ 50/ 3 12/ 21/ 6 102 7941 MLROnn 060125 - 060425 41/ 52/ 2 37/ 27/ 7 166 8834 WLRS01 060105 - 060425 51/ 50/ 3 58/ 34/ 10 206 -------------------------------------------------------------------------- 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) -------------------------------------------------------------- 060418.0 102.2 +/- 0.1 366.7 +/- 0.1 269.37 +/- 0.01 060419.0 101.8 +/- 0.1 365.8 +/- 0.1 269.10 +/- 0.02 060420.0 102.6 +/- 0.1 365.0 +/- 0.1 268.80 +/- 0.02 060421.0 103.6 +/- 0.1 364.5 +/- 0.1 268.36 +/- 0.03 060422.0 104.0 +/- 0.1 364.3 +/- 0.1 267.72 +/- 0.03 060423.0 105.1 +/- 0.1 364.0 +/- 0.1 266.75 +/- 0.04 060424.0 105.4 +/- 0.1 363.5 +/- 0.1 265.39 +/- 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 system 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 ******************************************************************************** |