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SLR-Report No.5181

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Date:2005-04-09 13:15:00
Sender:Ron Noomen <Ron Noomen <ron@astro.lr.tudelft.nl>>
Subject:[SLR-Report] No. 5181: Delft QL Report April 09, 2005
Author:Ron Noomen
Content:********************************************************************************
SLR Electronic Report 2005-04-09 13:15:00 UTC Message No. 5181
********************************************************************************

Author: Ron Noomen
Subject: Delft QL Report April 09, 2005


WEGENER-2 IERS

REPORT OF THE QUICK-LOOK DATA ANALYSIS CENTER
DELFT UNIVERSITY OF TECHNOLOGY
FACULTY OF AEROSPACE ENGINEERING
THE NETHERLANDS


April 9, 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, Apr 9, 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,
Apr 9, 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
------------------------------------------------------------------------------
1864 Maidanak, Uzbekistan (site 2) 050329 - 050406 3 4
1873 Simeiz, Crimea, Ukraine 050408 - 050408 1 1
7080 McDonald Obs., Fort Davis, TX 050407 - 050407 - 1
7090 Yarragadee, Australia 050407 - 050407 3 2
7110 Monument Peak, California 050407 - 050407 3 2
7237 Changchun, China 050407 - 050408 - 2
7824 San Fernando, Spain 050407 - 050407 - 1
7825 Mount Stromlo, Australia 050407 - 050408 7 3
7839 Graz, Austria 050408 - 050408 2 -
7840 Herstmonceux, United Kingdom 050408 - 050409 3 3
7841 Potsdam, Germany 050407 - 050409 1 2
7941 Matera, Italy (MLRO 532) 050408 - 050408 - 1
------ ------ --- ---
TOTAL 050329 - 050409 23 22
------------------------------------------------------------------------------


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, Apr 1, 2005 to Sat, Apr 9, 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 22 23
Number of Passes 144/144 163/162
Number of Normal Points 1546/1536 1921/1903
Weighted RMS of Fit (mm) 12 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 2 Apr 05 00:48 LAG1 1 0 103 0 +- 0 0 +- 0 0
1824 2 Apr 05 18:19 LAG2 1 0 12 0 +- 0 0 +- 0 0
1824 2 Apr 05 22:19 LAG2 4 0 52 411 +-2738 -229 +-1601 20
1824 4 Apr 05 18:15 LAG2 2 0 52 -344 +-3130 -396 +-3409 0

Station 1831 (Lviv) (position fixed, acc. 400 mm)
1831 1 Apr 05 01:57 LAG2 4 0 97 -114 +- 730 94 +-1796 3
1831 1 Apr 05 02:11 LAG1 6 0 75 -78 +- 555 25 +- 844 21
1831 1 Apr 05 20:01 LAG2 7 0 22 35 +-1225 -27 +- 858 16
1831 1 Apr 05 23:59 LAG2 4 0 106 -119 +- 695 54 +-1065 14
1831 2 Apr 05 00:43 LAG1 8 0 77 71 +- 435 60 +- 567 17
1831 4 Apr 05 00:10 LAG2 8 0 94 -93 +- 451 71 +- 538 20

Station 1864 (Maidanak) (position fixed, acc. 200 mm)
1864 1 Apr 05 15:49 LAG2 15 0 46 33 +- 155 -1 +- 96 32
1864 1 Apr 05 21:11 LAG1 7 0 58 69 +- 305 -15 +- 237 8
1864 2 Apr 05 18:11 LAG2 9 0 25 9 +- 250 -22 +- 237 16
1864 2 Apr 05 23:09 LAG1 9 0 37 33 +- 276 2 +- 181 20
1864 6 Apr 05 21:19 LAG1 11 0 31 23 +- 186 7 +- 139 14
1864 6 Apr 05 22:37 LAG2 10 0 23 20 +- 229 10 +- 166 16

Station 1873 (Simeiz) (position fixed, acc. 200 mm)
1873 8 Apr 05 22:17 LAG1 9 1 548 720 +- 386 -250 +- 394 129*CHK*
1873 8 Apr 05 22:37 LAG2 11 0 460 450 +- 203 -12 +- 179 58*CHK*

Station 1884 (Riga) (position fixed, acc. 100 mm)
1884 1 Apr 05 01:49 LAG2 9 0 12 10 +- 100 4 +- 131 3
1884 1 Apr 05 02:09 LAG1 10 0 18 10 +- 154 5 +- 105 6
1884 1 Apr 05 19:49 LAG2 8 0 13 -6 +- 196 -16 +- 178 5
1884 1 Apr 05 23:45 LAG2 9 0 10 -16 +- 233 -10 +- 160 7
1884 3 Apr 05 20:12 LAG2 8 0 28 29 +- 144 -3 +- 163 6
1884 4 Apr 05 00:03 LAG2 8 0 10 -9 +- 183 0 +- 166 5
1884 6 Apr 05 18:27 LAG2 14 0 27 27 +- 83 -11 +- 77 4
1884 6 Apr 05 22:27 LAG2 10 0 14 7 +- 95 -7 +- 110 11

Station 7080 (McDonald Obs.) (position fixed, acc. 20 mm)
7080 1 Apr 05 19:57 LAG1 12 0 4 0 +- 20 2 +- 16 2
7080 2 Apr 05 15:23 LAG2 15 0 8 7 +- 18 2 +- 21 2
7080 2 Apr 05 18:34 LAG1 11 0 12 8 +- 21 5 +- 19 4
7080 4 Apr 05 03:25 LAG2 9 0 18 -4 +- 52 -8 +- 31 4
7080 6 Apr 05 03:23 LAG2 18 0 3 2 +- 16 0 +- 10 1
7080 6 Apr 05 07:37 LAG2 17 0 6 4 +- 17 -1 +- 16 4
7080 6 Apr 05 12:17 LAG2 8 0 22 51 +- 231 -12 +- 101 2
7080 7 Apr 05 05:51 LAG2 5 0 6 8 +- 101 -14 +- 104 2
7080 7 Apr 05 08:35 LAG1 14 0 19 10 +- 18 14 +- 13 6
7080 7 Apr 05 09:59 LAG2 17 0 7 -1 +- 22 5 +- 16 4

Station 7090 (Yarragadee) (position fixed, acc. 10 mm)
7090 1 Apr 05 17:43 LAG1 9 0 48 -14 +- 14 17 +- 5 1
7090 2 Apr 05 09:33 LAG2 9 0 11 -4 +- 37 4 +- 25 1
7090 2 Apr 05 10:15 LAG1 3 0 12 28 +- 201 -37 +- 190 3
7090 2 Apr 05 13:17 LAG1 11 0 4 -3 +- 13 4 +- 17 1
7090 2 Apr 05 16:47 LAG1 7 0 14 -20 +- 34 22 +- 26 1
7090 3 Apr 05 07:43 LAG2 16 0 6 -5 +- 11 3 +- 10 3
7090 3 Apr 05 08:34 LAG1 17 0 8 -5 +- 10 -4 +- 6 3
7090 3 Apr 05 11:45 LAG2 16 0 5 5 +- 10 0 +- 8 2
7090 3 Apr 05 12:07 LAG1 5 0 12 -10 +- 20 -6 +- 61 1
7090 3 Apr 05 15:09 LAG1 13 0 10 -7 +- 11 4 +- 8 2
7090 3 Apr 05 18:55 LAG1 14 0 10 -20 +- 23 11 +- 12 1
7090 3 Apr 05 21:23 LAG2 13 0 19 -17 +- 11 10 +- 21 3
7090 4 Apr 05 07:35 LAG1 2 0 6 -45 +- 301 34 +- 255 0
7090 4 Apr 05 14:13 LAG1 5 0 14 -14 +- 55 0 +- 47 4
7090 4 Apr 05 17:23 LAG1 18 0 15 -14 +- 11 8 +- 6 2
7090 5 Apr 05 04:03 LAG2 4 0 17 -38 +- 285 13 +- 186 1
7090 5 Apr 05 19:27 LAG1 16 0 3 2 +- 10 1 +- 8 1
7090 5 Apr 05 21:35 LAG2 14 0 12 -12 +- 11 6 +- 13 3
7090 6 Apr 05 08:03 LAG1 15 0 13 3 +- 10 -8 +- 7 4
7090 6 Apr 05 09:59 LAG2 19 0 7 -5 +- 10 -1 +- 6 3
7090 6 Apr 05 11:27 LAG1 11 0 9 -8 +- 12 -5 +- 17 1
7090 6 Apr 05 14:41 LAG1 10 0 3 2 +- 16 3 +- 17 1
7090 6 Apr 05 18:07 LAG1 18 0 21 -14 +- 10 10 +- 5 1
7090 7 Apr 05 06:43 LAG1 6 0 15 -21 +- 48 -3 +- 33 1
7090 7 Apr 05 08:06 LAG2 17 0 8 2 +- 10 -6 +- 8 2
7090 7 Apr 05 10:09 LAG1 8 0 6 2 +- 14 0 +- 13 6
7090 7 Apr 05 12:21 LAG2 13 0 8 -2 +- 18 9 +- 17 1
7090 7 Apr 05 13:29 LAG1 6 0 9 -6 +- 17 9 +- 22 2
7090 7 Apr 05 16:35 LAG1 18 0 21 -2 +- 10 9 +- 4 2
7090 7 Apr 05 20:23 LAG1 6 0 8 7 +- 32 -1 +- 50 1
7090 7 Apr 05 21:39 LAG2 16 0 9 11 +- 13 3 +- 13 2

Station 7105 (Greenbelt) (position fixed, acc. 10 mm)
7105 4 Apr 05 03:59 LAG2 4 0 22 -10 +- 685 -4 +- 274 1
7105 4 Apr 05 05:47 LAG1 7 0 10 3 +- 71 4 +- 46 2
7105 4 Apr 05 07:25 LAG2 13 0 11 -11 +- 12 0 +- 7 3
7105 5 Apr 05 01:19 LAG2 11 0 8 -11 +- 38 -9 +- 20 2
7105 6 Apr 05 03:31 LAG2 15 0 4 2 +- 12 3 +- 8 2
7105 7 Apr 05 01:55 LAG2 5 0 4 4 +- 29 -11 +- 49 1

Station 7110 (Monument Peak) (position fixed, acc. 10 mm)
7110 5 Apr 05 08:05 LAG1 4 0 5 14 +- 67 -19 +- 98 3
7110 6 Apr 05 07:19 LAG2 11 1 9 6 +- 13 2 +- 12 6
7110 6 Apr 05 10:18 LAG1 4 0 12 -22 +- 88 20 +- 63 9
7110 6 Apr 05 11:39 LAG2 7 0 10 3 +- 16 4 +- 9 6
7110 7 Apr 05 05:44 LAG2 7 0 17 -1 +- 44 -11 +- 34 3
7110 7 Apr 05 09:07 LAG1 3 0 13 7 +- 543 2 +- 250 0
7110 7 Apr 05 09:41 LAG2 15 0 5 2 +- 10 0 +- 8 5
7110 7 Apr 05 12:05 LAG1 10 0 10 4 +- 14 6 +- 8 3
7110 7 Apr 05 13:59 LAG2 11 0 8 -3 +- 18 7 +- 13 3
7110 7 Apr 05 18:55 LAG1 2 0 6 -22 +- 273 -14 +- 245 0

Station 7124 (Papeete) (position fixed, acc. 10 mm)
7124 1 Apr 05 10:35 LAG1 8 0 10 19 +- 26 -13 +- 22 1

Station 7237 (Changchun) (position fixed, acc. 50 mm)
7237 2 Apr 05 14:22 LAG2 5 0 31 18 +- 71 -15 +- 60 10
7237 2 Apr 05 18:45 LAG2 3 0 14 16 +- 146 -20 +- 239 9
7237 2 Apr 05 19:25 LAG1 7 0 23 19 +- 61 -4 +- 41 4
7237 3 Apr 05 12:45 LAG2 4 0 13 13 +- 160 -1 +- 103 7
7237 6 Apr 05 17:33 LAG1 7 0 14 -12 +- 59 0 +- 57 6
7237 6 Apr 05 19:17 LAG2 7 0 37 4 +- 173 -29 +- 127 5
7237 7 Apr 05 12:57 LAG2 14 0 20 16 +- 41 -10 +- 34 6
7237 8 Apr 05 15:19 LAG2 4 0 44 24 +- 144 -113 +- 265 9

Station 7501 (Hartebeesthoek) (position fixed, acc. 10 mm)
7501 4 Apr 05 17:25 LAG2 16 0 9 5 +- 10 -6 +- 9 3
7501 4 Apr 05 21:37 LAG1 6 0 32 7 +- 106 12 +- 54 2
7501 5 Apr 05 00:51 LAG1 5 0 27 29 +- 24 6 +- 47 1
7501 5 Apr 05 20:05 LAG1 2 0 24 65 +- 128 86 +- 245 0
7501 5 Apr 05 23:21 LAG1 7 0 13 20 +- 39 5 +- 26 1
7501 6 Apr 05 12:13 LAG1 3 0 3 -2 +- 55 5 +- 126 3

Station 7811 (Borowiec) (position fixed, acc. 60 mm)
7811 1 Apr 05 19:44 LAG2 14 0 18 15 +- 48 1 +- 42 9
7811 1 Apr 05 23:49 LAG2 13 0 15 14 +- 51 0 +- 44 5
7811 2 Apr 05 00:42 LAG1 9 0 17 12 +- 65 -2 +- 73 12
7811 4 Apr 05 22:05 LAG2 15 0 24 24 +- 48 0 +- 33 5
7811 5 Apr 05 00:03 LAG1 11 0 31 27 +- 55 -9 +- 59 8
7811 5 Apr 05 02:16 LAG2 9 0 28 27 +- 65 3 +- 81 5
7811 6 Apr 05 18:27 LAG2 5 0 24 18 +- 113 -14 +- 215 0

Station 7824 (San Fernando) (position fixed, acc. 40 mm)
7824 7 Apr 05 20:33 LAG2 2 0 34 71 +-2077 -24 +-1366 0

Station 7825 (Mount Stromlo) (position solved, acc. 10 mm)
7825 1 Apr 05 03:17 LAG2 20 1 8 6 +- 9 0 +- 8 6
7825 1 Apr 05 04:02 LAG1 15 1 18 -16 +- 11 -6 +- 9 8
7825 1 Apr 05 07:37 LAG1 9 0 7 -9 +- 18 -8 +- 18 1
7825 1 Apr 05 07:55 LAG2 13 0 3 6 +- 31 -3 +- 16 1
7825 1 Apr 05 10:57 LAG1 13 0 6 -5 +- 11 0 +- 12 1
7825 1 Apr 05 14:13 LAG1 14 0 12 -10 +- 11 0 +- 6 6
7825 1 Apr 05 18:09 LAG1 7 0 13 -36 +- 51 26 +- 43 5
7825 2 Apr 05 01:14 LAG2 18 1 14 3 +- 13 -5 +- 10 10
7825 2 Apr 05 02:53 LAG1 5 0 18 -18 +- 18 -5 +- 59 1
7825 2 Apr 05 09:41 LAG2 11 0 11 -7 +- 12 0 +- 12 9
7825 4 Apr 05 01:59 LAG2 9 0 14 20 +- 41 -5 +- 32 2
7825 4 Apr 05 03:25 LAG1 18 0 12 5 +- 9 -4 +- 5 9
7825 4 Apr 05 05:53 LAG2 18 0 15 14 +- 10 0 +- 5 5
7825 4 Apr 05 06:59 LAG1 17 0 12 11 +- 10 0 +- 7 4
7825 4 Apr 05 13:39 LAG1 21 0 18 12 +- 9 0 +- 5 13
7825 5 Apr 05 04:01 LAG2 18 0 10 10 +- 11 -8 +- 9 3
7825 5 Apr 05 05:59 LAG1 6 0 8 0 +- 50 5 +- 35 1
7825 5 Apr 05 08:03 LAG2 22 0 18 7 +- 9 9 +- 6 6
7825 5 Apr 05 09:07 LAG1 14 0 14 14 +- 11 -3 +- 10 3
7825 5 Apr 05 12:25 LAG1 14 0 9 0 +- 12 2 +- 7 8
7825 5 Apr 05 15:55 LAG1 18 0 10 -9 +- 10 1 +- 6 5
7825 5 Apr 05 21:37 LAG2 18 1 14 5 +- 11 -8 +- 9 4
7825 6 Apr 05 01:51 LAG2 19 0 12 2 +- 9 -10 +- 9 3
7825 6 Apr 05 04:17 LAG1 20 0 20 -17 +- 9 -4 +- 5 5
7825 6 Apr 05 06:19 LAG2 15 0 8 -8 +- 14 0 +- 9 1
7825 6 Apr 05 07:47 LAG1 18 0 12 -10 +- 10 -2 +- 7 3
7825 6 Apr 05 10:11 LAG2 14 0 6 5 +- 11 4 +- 15 1
7825 6 Apr 05 11:09 LAG1 6 0 12 -21 +- 43 -11 +- 44 4
7825 6 Apr 05 14:23 LAG1 20 0 14 -10 +- 9 -5 +- 4 6
7825 6 Apr 05 19:59 LAG2 16 0 11 12 +- 11 -3 +- 12 2
7825 7 Apr 05 02:59 LAG1 5 0 10 -26 +- 72 -15 +- 64 0
7825 7 Apr 05 06:27 LAG1 16 0 5 3 +- 10 0 +- 7 4
7825 7 Apr 05 08:15 LAG2 18 0 3 1 +- 9 0 +- 7 3
7825 7 Apr 05 13:15 LAG1 11 1 10 -8 +- 13 7 +- 13 4
7825 7 Apr 05 17:01 LAG1 4 1 15 -88 +- 164 78 +- 149 8
7825 8 Apr 05 06:19 LAG2 21 0 10 7 +- 9 3 +- 5 2
7825 8 Apr 05 08:35 LAG1 11 0 12 -12 +- 13 -10 +- 14 2
7825 8 Apr 05 11:59 LAG1 13 2 14 22 +- 20 -10 +- 15 1
7825 8 Apr 05 15:11 LAG1 24 0 11 -1 +- 8 -3 +- 4 7
7825 8 Apr 05 20:17 LAG2 15 0 12 -15 +- 15 12 +- 13 3

Station 7832 (Riyad) (position solved, acc. 20 mm)
7832 2 Apr 05 00:43 LAG1 10 0 10 -12 +- 34 -3 +- 23 4
7832 2 Apr 05 04:18 LAG2 12 0 22 -15 +- 21 -9 +- 23 2
7832 2 Apr 05 17:56 LAG2 5 0 3 -1 +- 30 0 +- 49 3
7832 2 Apr 05 22:03 LAG2 9 0 11 -9 +- 31 3 +- 47 2
7832 3 Apr 05 02:17 LAG2 7 0 4 3 +- 74 3 +- 56 4
7832 3 Apr 05 09:38 LAG1 8 0 12 10 +- 49 1 +- 33 2
7832 3 Apr 05 15:47 LAG2 8 0 12 4 +- 88 -3 +- 51 4
7832 3 Apr 05 19:53 LAG2 9 0 8 -20 +- 62 -16 +- 47 3
7832 3 Apr 05 22:07 LAG1 11 0 6 3 +- 20 -1 +- 21 5
7832 4 Apr 05 00:21 LAG2 11 0 2 0 +- 23 3 +- 29 1
7832 4 Apr 05 01:31 LAG1 8 0 17 -7 +- 48 -17 +- 36 5
7832 4 Apr 05 04:41 LAG2 7 0 8 3 +- 60 -4 +- 62 8
7832 4 Apr 05 17:53 LAG2 13 0 10 -12 +- 31 -10 +- 20 4
7832 4 Apr 05 22:19 LAG2 12 0 6 6 +- 20 7 +- 30 1
7832 5 Apr 05 00:11 LAG1 11 0 18 8 +- 23 -8 +- 18 2
7832 5 Apr 05 02:33 LAG2 12 0 6 3 +- 20 -1 +- 21 4
7832 5 Apr 05 15:57 LAG2 10 0 11 -12 +- 27 -9 +- 19 3
7832 5 Apr 05 22:47 LAG1 17 0 11 0 +- 16 -6 +- 10 3
7832 6 Apr 05 00:31 LAG2 11 0 8 14 +- 36 8 +- 31 3
7832 6 Apr 05 04:46 LAG2 10 0 26 24 +- 24 3 +- 35 4
7832 6 Apr 05 18:19 LAG2 14 0 23 -17 +- 18 -9 +- 17 4

Station 7835 (Grasse) (position fixed, acc. 30 mm)
7835 6 Apr 05 22:01 LAG2 11 0 11 -2 +- 97 -7 +- 50 1
7835 7 Apr 05 00:57 LAG1 4 0 3 16 +- 427 8 +- 257 0

Station 7837 (Shanghai Observatory) (position fixed, acc. 50 mm)
7837 3 Apr 05 12:26 LAG2 5 0 12 11 +- 106 0 +- 159 5
7837 3 Apr 05 18:15 LAG1 3 0 9 17 +- 430 24 +- 428 3
7837 6 Apr 05 15:00 LAG2 10 0 12 -3 +- 120 -2 +- 88 9
7837 6 Apr 05 17:33 LAG1 17 0 32 12 +- 37 16 +- 25 15
7837 6 Apr 05 19:07 LAG2 15 0 21 -6 +- 44 -9 +- 40 15

Station 7838 (Simosato Observatory) (position fixed, acc. 30 mm)
7838 1 Apr 05 01:28 LAG1 9 0 18 13 +- 38 5 +- 43 9
7838 1 Apr 05 12:05 LAG2 25 0 57 49 +- 19 12 +- 10 7
7838 3 Apr 05 16:29 LAG2 27 0 36 36 +- 18 0 +- 12 4
7838 3 Apr 05 17:55 LAG1 24 0 37 35 +- 19 -5 +- 9 4
7838 4 Apr 05 04:15 LAG1 12 0 19 18 +- 37 0 +- 18 5
7838 4 Apr 05 10:23 LAG2 26 0 53 45 +- 18 14 +- 10 5
7838 4 Apr 05 14:27 LAG2 27 0 37 31 +- 18 12 +- 11 3
7838 4 Apr 05 16:31 LAG1 24 0 39 37 +- 19 -5 +- 10 2
7838 5 Apr 05 02:47 LAG1 19 0 28 28 +- 22 -1 +- 13 2
7838 5 Apr 05 12:31 LAG2 26 0 48 33 +- 18 18 +- 10 4

Station 7839 (Graz) (position fixed, acc. 10 mm)
7839 1 Apr 05 05:35 LAG1 10 0 2 0 +- 13 -1 +- 8 1
7839 1 Apr 05 05:45 LAG2 9 0 7 7 +- 14 -3 +- 12 0
7839 1 Apr 05 08:55 LAG1 12 0 5 5 +- 12 -1 +- 7 2
7839 1 Apr 05 12:23 LAG1 14 0 11 -4 +- 12 -8 +- 8 0
7839 1 Apr 05 19:33 LAG2 22 0 5 0 +- 8 -2 +- 5 2
7839 1 Apr 05 23:41 LAG2 19 0 6 -5 +- 9 0 +- 5 2
7839 2 Apr 05 00:39 LAG1 13 0 4 -2 +- 12 2 +- 7 1
7839 2 Apr 05 17:57 LAG2 15 0 4 4 +- 14 -3 +- 9 0
7839 2 Apr 05 21:37 LAG2 25 0 5 -4 +- 8 1 +- 4 2
7839 2 Apr 05 23:17 LAG1 10 0 8 -6 +- 13 -3 +- 12 2
7839 3 Apr 05 01:45 LAG2 16 0 3 -3 +- 10 0 +- 5 1
7839 3 Apr 05 02:43 LAG1 20 0 6 -6 +- 9 0 +- 4 1
7839 3 Apr 05 19:47 LAG2 17 0 10 4 +- 10 -5 +- 5 2
7839 3 Apr 05 23:59 LAG2 14 0 8 -2 +- 12 5 +- 7 1
7839 4 Apr 05 01:21 LAG1 17 0 9 -3 +- 10 -3 +- 4 4
7839 4 Apr 05 03:51 LAG2 28 0 5 4 +- 7 0 +- 4 2
7839 4 Apr 05 04:49 LAG1 25 0 7 -2 +- 8 3 +- 4 2
7839 4 Apr 05 08:27 LAG1 12 0 3 -1 +- 12 2 +- 11 1
7839 4 Apr 05 11:51 LAG1 17 0 2 2 +- 10 0 +- 6 1
7839 4 Apr 05 17:59 LAG2 11 0 14 5 +- 14 -7 +- 10 1
7839 4 Apr 05 21:57 LAG2 10 0 5 3 +- 13 1 +- 6 1
7839 5 Apr 05 00:01 LAG1 12 0 7 -1 +- 12 -5 +- 8 2
7839 5 Apr 05 02:01 LAG2 14 0 5 4 +- 11 1 +- 6 0
7839 5 Apr 05 03:27 LAG1 26 0 3 3 +- 8 0 +- 3 2
7839 5 Apr 05 07:07 LAG1 14 0 5 -1 +- 11 3 +- 8 2
7839 5 Apr 05 10:39 LAG1 11 0 5 5 +- 15 0 +- 11 1
7839 5 Apr 05 20:01 LAG2 13 0 11 9 +- 11 -5 +- 6 1
7839 5 Apr 05 22:48 LAG1 4 0 13 -13 +- 28 1 +- 36 0
7839 6 Apr 05 00:07 LAG2 13 0 14 3 +- 11 8 +- 6 1
7839 6 Apr 05 02:15 LAG1 17 0 20 11 +- 10 -10 +- 5 4
7839 8 Apr 05 06:27 LAG1 18 0 7 5 +- 9 -3 +- 5 1
7839 8 Apr 05 10:14 LAG1 5 0 25 -7 +- 48 -9 +- 24 0

Station 7840 (Herstmonceux) (position fixed, acc. 20 mm)
7840 1 Apr 05 23:33 LAG2 13 0 3 1 +- 24 2 +- 16 1
7840 2 Apr 05 00:44 LAG1 5 0 6 6 +- 34 3 +- 67 1
7840 2 Apr 05 03:41 LAG2 20 0 14 2 +- 15 -9 +- 9 1
7840 2 Apr 05 04:11 LAG1 17 0 2 0 +- 16 0 +- 8 1
7840 2 Apr 05 07:57 LAG1 8 0 14 19 +- 41 -4 +- 29 2
7840 2 Apr 05 11:19 LAG1 12 0 12 16 +- 25 -5 +- 16 1
7840 2 Apr 05 21:49 LAG2 8 0 6 6 +- 27 8 +- 35 2
7840 3 Apr 05 06:01 LAG2 10 0 3 4 +- 30 -4 +- 30 1
7840 3 Apr 05 06:21 LAG1 14 0 6 5 +- 18 0 +- 12 3
7840 3 Apr 05 13:19 LAG1 6 0 10 0 +- 108 -6 +- 64 3
7840 3 Apr 05 19:49 LAG2 14 0 9 9 +- 18 -3 +- 11 1
7840 5 Apr 05 06:19 LAG2 3 0 10 13 +- 118 -6 +- 204 1
7840 5 Apr 05 07:11 LAG1 14 0 8 7 +- 17 0 +- 12 3
7840 5 Apr 05 20:01 LAG2 17 0 13 12 +- 16 -1 +- 10 3
7840 6 Apr 05 18:25 LAG2 7 0 18 18 +- 25 -7 +- 56 0
7840 6 Apr 05 22:05 LAG2 14 0 8 7 +- 17 0 +- 9 2
7840 7 Apr 05 07:57 LAG1 12 0 12 0 +- 19 9 +- 15 2
7840 8 Apr 05 22:19 LAG2 13 0 15 4 +- 18 -8 +- 10 1

Station 7841 (Potsdam) (position solved, acc. 10 mm)
7841 1 Apr 05 01:35 LAG2 10 0 17 13 +- 28 17 +- 19 10
7841 1 Apr 05 01:55 LAG1 13 0 10 10 +- 17 2 +- 11 7
7841 1 Apr 05 05:29 LAG1 14 0 2 0 +- 11 0 +- 5 2
7841 1 Apr 05 05:49 LAG2 8 0 3 3 +- 18 -4 +- 27 1
7841 1 Apr 05 19:37 LAG2 17 0 4 1 +- 10 -2 +- 6 2
7841 1 Apr 05 23:35 LAG2 15 0 3 -1 +- 16 -1 +- 10 2
7841 2 Apr 05 00:32 LAG1 11 0 14 17 +- 21 13 +- 16 9
7841 2 Apr 05 03:49 LAG2 9 0 12 1 +- 18 -12 +- 20 1
7841 2 Apr 05 04:15 LAG1 14 0 6 -2 +- 11 3 +- 8 4
7841 2 Apr 05 07:37 LAG1 12 0 11 11 +- 12 3 +- 9 2
7841 2 Apr 05 21:49 LAG2 19 0 5 -3 +- 10 2 +- 6 2
7841 3 Apr 05 01:44 LAG2 25 0 3 -2 +- 8 0 +- 4 2
7841 3 Apr 05 02:53 LAG1 15 0 11 -7 +- 11 -1 +- 6 6
7841 3 Apr 05 05:51 LAG2 15 0 5 3 +- 10 -2 +- 11 2
7841 3 Apr 05 06:21 LAG1 13 0 4 0 +- 11 3 +- 9 1
7841 3 Apr 05 23:59 LAG2 10 0 8 -5 +- 16 4 +- 16 2
7841 4 Apr 05 01:29 LAG1 14 0 7 3 +- 11 0 +- 9 6
7841 4 Apr 05 04:03 LAG2 13 0 9 8 +- 11 0 +- 11 3
7841 4 Apr 05 05:05 LAG1 8 0 7 0 +- 15 7 +- 18 3
7841 4 Apr 05 22:07 LAG2 6 0 2 -2 +- 33 -1 +- 36 1
7841 5 Apr 05 00:03 LAG1 4 1 19 51 +- 136 62 +- 127 2
7841 5 Apr 05 02:19 LAG2 9 0 3 1 +- 21 0 +- 20 2
7841 7 Apr 05 20:25 LAG2 8 2 11 -20 +- 44 -12 +- 38 7
7841 8 Apr 05 22:21 LAG2 11 1 228 -127 +- 49 53 +- 25 4*CHK*

Station 7941 (Matera) (position solved, acc. 10 mm)
7941 1 Apr 05 19:31 LAG2 15 0 8 7 +- 14 0 +- 9 3
7941 1 Apr 05 23:43 LAG2 3 0 7 -39 +- 366 -26 +- 213 0
7941 2 Apr 05 17:45 LAG2 13 0 3 1 +- 11 0 +- 8 2
7941 4 Apr 05 00:03 LAG2 8 0 13 -8 +- 19 8 +- 26 1
7941 4 Apr 05 17:57 LAG2 4 0 1 8 +- 214 5 +- 127 0
7941 6 Apr 05 22:17 LAG2 13 0 9 -7 +- 13 6 +- 8 3
7941 7 Apr 05 02:23 LAG2 16 0 15 -3 +- 10 -9 +- 6 3
7941 8 Apr 05 00:39 LAG2 11 0 7 3 +- 16 5 +- 16 1

Station 8834 (Wettzell) (position fixed, acc. 10 mm)
8834 1 Apr 05 02:03 LAG2 3 0 10 14 +- 301 -17 +- 206 0
8834 1 Apr 05 02:10 LAG1 5 0 10 10 +- 33 20 +- 47 6
8834 1 Apr 05 05:23 LAG1 13 0 6 -2 +- 15 1 +- 8 4
8834 1 Apr 05 05:35 LAG2 11 0 5 1 +- 12 3 +- 8 3
8834 1 Apr 05 08:55 LAG1 9 0 4 2 +- 14 1 +- 7 1
8834 1 Apr 05 12:27 LAG1 8 0 20 -11 +- 16 -14 +- 11 6
8834 1 Apr 05 19:39 LAG2 12 0 6 -2 +- 16 1 +- 13 5
8834 1 Apr 05 23:31 LAG2 13 0 16 -10 +- 26 2 +- 14 5
8834 2 Apr 05 00:35 LAG1 9 0 5 -2 +- 35 1 +- 24 2
8834 2 Apr 05 03:45 LAG2 7 0 16 -3 +- 65 -12 +- 40 1
8834 2 Apr 05 04:19 LAG1 15 0 13 -13 +- 13 0 +- 7 3
8834 2 Apr 05 07:35 LAG1 6 0 12 13 +- 24 11 +- 15 2
8834 2 Apr 05 08:03 LAG2 3 0 24 0 +- 258 -30 +- 330 4
8834 2 Apr 05 15:01 LAG1 9 0 9 -9 +- 41 0 +- 34 3
8834 2 Apr 05 18:17 LAG2 5 0 15 -5 +- 106 -6 +- 64 1
8834 2 Apr 05 21:47 LAG2 5 0 8 -28 +- 111 -13 +- 67 2
8834 2 Apr 05 23:17 LAG1 5 0 6 6 +- 51 5 +- 80 5
8834 3 Apr 05 01:45 LAG2 10 0 7 -18 +- 44 -8 +- 24 4
8834 3 Apr 05 02:53 LAG1 7 0 6 -5 +- 34 0 +- 25 2
8834 3 Apr 05 05:49 LAG2 14 0 6 5 +- 13 4 +- 12 5
8834 3 Apr 05 06:19 LAG1 10 0 14 5 +- 19 12 +- 15 8
8834 3 Apr 05 09:39 LAG1 16 0 8 6 +- 10 0 +- 5 5
8834 3 Apr 05 13:21 LAG1 1 0 12 0 +- 0 0 +- 0 0
8834 3 Apr 05 20:13 LAG2 4 0 6 7 +- 84 -13 +- 82 1
8834 4 Apr 05 00:07 LAG2 6 0 5 -5 +- 17 4 +- 33 1
8834 4 Apr 05 01:23 LAG1 11 0 11 8 +- 25 -1 +- 16 4
8834 4 Apr 05 04:05 LAG2 20 0 5 0 +- 10 0 +- 6 5
8834 4 Apr 05 05:15 LAG1 10 0 9 -9 +- 28 1 +- 15 5
8834 4 Apr 05 08:09 LAG2 8 0 18 -14 +- 34 -5 +- 46 1
8834 4 Apr 05 08:27 LAG1 9 0 15 -11 +- 17 4 +- 16 3
8834 4 Apr 05 12:09 LAG1 3 0 1 -1 +- 62 0 +- 109 0
8834 4 Apr 05 18:15 LAG2 5 0 7 0 +- 18 19 +- 56 3
8834 4 Apr 05 22:33 LAG2 6 0 7 -27 +- 244 14 +- 101 1
8834 5 Apr 05 00:09 LAG1 5 0 8 2 +- 19 -7 +- 17 1
8834 5 Apr 05 02:05 LAG2 9 0 2 0 +- 31 0 +- 22 2
8834 5 Apr 05 03:41 LAG1 10 0 12 -9 +- 13 4 +- 7 3
8834 5 Apr 05 06:08 LAG2 13 0 6 -6 +- 14 2 +- 13 4
8834 5 Apr 05 07:19 LAG1 4 0 10 -8 +- 33 -3 +- 65 3
8834 5 Apr 05 10:35 LAG1 9 0 6 -6 +- 15 0 +- 13 2
8834 6 Apr 05 13:01 LAG1 2 0 18 -231 +- 549 240 +- 608 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 - 050404 0/ 24/ 0 0/ 31/ 0 55
1831 LVIL 040815 - 050404 0/ 27/ 0 0/ 37/ 0 64
1864 MD2LAS 040701 - 050406 0/ 93/ 0 0/ 84/ 0 177
1873 SIMLAS 040703 - 050408 0/ 26/ 0 0/ 18/ 0 44
1884 RIGLAS 040712 - 050406 0/ 46/ 1 0/ 38/ 2 87
1893 CRMLAS 040705 - 041012 0/ 45/ 0 0/ 35/ 0 80
6405 TIGO 040710 - 050323 10/ 13/ 1 7/ 19/ 1 51
6810 ZIMLAT 040805 - 050209 188/116/ 21 111/108/ 19 563
7080 MLRS25 040701 - 050407 62/ 66/ 5 56/ 87/ 7 283
7090 ML0514 040716 - 050407 144/421/ 37 126/268/ 31 1027
7105 ML0725 040701 - 050407 0/ 87/ 4 2/114/ 7 214
7110 ML0414 040701 - 050407 81/138/ 18 81/150/ 20 488
7124 ML0819 040705 - 050401 0/ 34/ 0 0/ 14/ 0 48
7231 WUHA01 040701 - 041208 0/ 8/ 0 0/ 20/ 0 28
7237 CHALAS 040702 - 050408 0/157/ 1 0/179/ 1 338
7249 BEJLAS 040701 - 050328 0/107/ 0 0/133/ 0 240
7308 CRLLAS 041201 - 050307 9/ 11/ 2 3/ 15/ 0 40
7355 TROS02 040702 - 040829 0/ 37/ 0 0/ 29/ 0 66
7405 TIGO 040710 - 050320 6/ 28/ 0 3/ 10/ 0 47
7501 ML0616 040701 - 050406 23/ 45/ 4 58/ 82/ 6 218
7604 BREF 041017 - 041021 0/ 1/ 0 0/ 2/ 0 3
7806 METLAS 040720 - 050301 0/ 16/ 0 0/ 11/ 0 27
7810 ZIMLAT 040701 - 050209 242/142/ 27 136/127/ 23 697
7811 POLLAS 040706 - 050406 0/ 57/ 0 0/ 74/ 0 131
7824 SPNLAS 040701 - 050407 0/106/ 0 0/100/ 0 206
7825 STL3 040807 - 050408 156/244/ 38 153/156/ 27 774
7832 SALRO 040702 - 050406 148/234/ 19 192/282/ 27 902
7835 GRASSE 040702 - 050407 0/ 50/ 2 0/ 43/ 2 97
7836 GFZLAS 040701 - 040701 0/ 1/ 0 0/ 0/ 0 1
7837 CHILAS 040704 - 050406 0/102/ 0 0/145/ 2 249
7838 SHOLAS 040701 - 050405 68/123/ 4 80/158/ 7 440
7839 AUSLAS 040701 - 050408 210/180/ 30 95/179/ 24 718
7840 RGOLAS 040701 - 050409 151/112/ 24 85/116/ 15 503
7841 GFZLA3 040702 - 050409 56/ 71/ 17 28/ 90/ 12 274
7845 GRASLL 040705 - 040920 11/ 14/ 0 3/ 12/ 1 41
7941 MLROnn 040701 - 050408 94/ 69/ 10 80/ 88/ 7 348
8834 WLRS01 040701 - 050406 237/150/ 30 139/167/ 23 746
--------------------------------------------------------------------------


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)
--------------------------------------------------------------
050402.0 -30.5 +/- 0.1 244.1 +/- 0.1 -32631.54 +/- 0.01
050403.0 -32.3 +/- 0.1 245.3 +/- 0.1 -32631.74 +/- 0.02
050404.0 -33.5 +/- 0.1 245.9 +/- 0.1 -32632.14 +/- 0.03
050405.0 -34.6 +/- 0.1 246.1 +/- 0.1 -32632.86 +/- 0.04
050406.0 -35.4 +/- 0.1 247.0 +/- 0.1 -32633.95 +/- 0.04
050407.0 -35.5 +/- 0.1 248.7 +/- 0.1 -32635.15 +/- 0.05
050408.0 -37.2 +/- 0.1 249.6 +/- 0.1 -32636.49 +/- 0.05
--------------------------------------------------------------



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

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