| Date: | 2006-06-06 22:52:00 | |
| Sender: | Ron Noomen <Ron Noomen <ron@astro.lr.tudelft.nl>> | |
| Subject: | [SLR-Report] No. 7214: Delft QL Report June 06, 2006 | |
| Author: | Ron Noomen | |
| Content: | ******************************************************************************** SLR Electronic Report 2006-06-06 22:52:00 UTC Message No. 7214 ******************************************************************************** Author: Ron Noomen Subject: Delft QL Report June 06, 2006 WEGENER-2 IERS REPORT OF THE QUICK-LOOK DATA ANALYSIS CENTER DELFT UNIVERSITY OF TECHNOLOGY FACULTY OF AEROSPACE ENGINEERING THE NETHERLANDS June 3, 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 Sat, Jun 3, 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 Sat, Jun 3, 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) 060529 - 060604 3 7 1873 Simeiz, Crimea, Ukraine 060530 - 060604 - 4 1884 Riga, Latvia 060602 - 060602 - 1 6405 Concepcion, Chile (TIGO 847) 060517 - 060603 13 14 6810 Zimmerwald 846, Switzerland 060530 - 060603 3 1 7080 McDonald Obs., Fort Davis, TX 060531 - 060605 6 5 7090 Yarragadee, Australia 060530 - 060604 21 12 7105 Greenbelt, Maryland 060530 - 060601 - 4 7110 Monument Peak, California 060530 - 060605 19 13 7124 Papeete, Tahiti 060601 - 060605 4 1 7237 Changchun, China 060603 - 060605 1 3 7406 San Juan, Argentina 060530 - 060605 14 8 7501 Hartebeesthoek, SA (MOB-6) 060530 - 060604 15 14 7810 Zimmerwald 423, Switzerland 060530 - 060603 3 1 7811 Borowiec, Poland 060531 - 060602 - 3 7821 Shanghai Observatory, China 060602 - 060602 1 2 7824 San Fernando, Spain 060602 - 060602 1 - 7825 Mount Stromlo, Australia 060530 - 060603 11 6 7832 Riyad, Saudi Arabia 060530 - 060605 12 16 7838 Simosato Observatory, Japan 060530 - 060605 4 4 7839 Graz, Austria 060531 - 060601 4 2 7840 Herstmonceux, United Kingdom 060530 - 060605 10 8 7841 Potsdam, Germany 060601 - 060602 - 2 7941 Matera, Italy (MLRO 532) 060530 - 060605 9 7 8834 Wettzell, Germany 060601 - 060603 2 3 ------ ------ --- --- TOTAL 060517 - 060605 156 141 ------------------------------------------------------------------------------ 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, May 26, 2006 to Sat, Jun 3, 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 0 0 Number of Passes 0/ 0 0/ 0 Number of Normal Points 0/ 0 0000/ 0 Weighted RMS of Fit (mm) 0 0 ----------------------------------------------------------------------- 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) -------------------------------------------------------------------------------- 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 - 060604 0/ 52/ 0 0/ 29/ 0 81 1873 SIMLAS 060328 - 060604 0/ 11/ 0 0/ 11/ 0 22 1884 RIGLAS 060112 - 060602 0/ 33/ 1 0/ 18/ 1 53 1893 CRMLAS 060113 - 060523 0/ 8/ 0 0/ 2/ 0 10 6405 TIGO 060103 - 060603 21/ 56/ 1 20/ 54/ 10 162 6810 ZIMLAT 060103 - 060603 111/ 86/ 11 92/ 53/ 9 362 7080 MLRS25 060102 - 060605 7/ 57/ 3 10/ 47/ 1 125 7090 ML0514 060101 - 060604 180/267/ 20 123/237/ 20 847 7105 ML0725 060106 - 060601 16/ 65/ 4 25/ 38/ 5 153 7110 ML0414 060103 - 060605 107/ 85/ 10 77/ 69/ 8 356 7124 ML0819 060225 - 060605 0/ 33/ 0 0/ 19/ 0 52 7130 TL04** 060125 - 060316 9/ 9/ 0 3/ 4/ 2 27 7237 CHALAS 060101 - 060605 0/ 95/ 0 0/ 47/ 0 142 7249 BEJLAS 060104 - 060528 0/ 55/ 0 0/ 17/ 0 72 7308 CRLLAS 060110 - 060521 8/ 19/ 0 6/ 14/ 0 47 7358 GMSL 060111 - 060430 1/ 12/ 0 1/ 7/ 0 21 7405 TIGO 060103 - 060302 0/ 9/ 0 0/ 5/ 0 14 7406 060223 - 060605 0/193/ 0 0/159/ 0 352 7501 ML0616 060117 - 060604 34/ 99/ 6 28/ 91/ 6 264 7810 ZIMLAT 060103 - 060603 111/ 89/ 11 90/ 53/ 8 362 7811 POLLAS 060109 - 060602 0/ 31/ 0 0/ 14/ 0 45 7821 CHILAS 060106 - 060602 0/ 18/ 0 0/ 13/ 0 31 7824 SPNLAS 060109 - 060602 0/ 80/ 1 0/ 33/ 1 115 7825 STL3 060102 - 060603 110/172/ 16 103/182/ 16 599 7832 SALRO 060103 - 060605 59/104/ 7 80/ 85/ 9 344 7838 SHOLAS 060105 - 060605 33/ 80/ 3 34/ 44/ 4 198 7839 AUSLAS 060109 - 060601 80/ 69/ 5 74/ 32/ 6 266 7840 RGOLAS 060104 - 060605 97/ 77/ 12 77/ 37/ 8 308 7841 GFZLA3 060107 - 060602 11/ 56/ 5 17/ 31/ 7 127 7941 MLROnn 060125 - 060605 82/ 62/ 5 56/ 46/ 10 261 8834 WLRS01 060105 - 060603 73/ 59/ 3 91/ 43/ 12 281 -------------------------------------------------------------------------- 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. 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 ******************************************************************************** |