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SLR-Report No.5081

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Date:2005-03-19 13:15:00
Sender:Ron Noomen <Ron Noomen <ron@astro.lr.tudelft.nl>>
Subject:[SLR-Report] No. 5081: Delft QL Report March 19, 2005
Author:Ron Noomen
Content:********************************************************************************
SLR Electronic Report 2005-03-19 13:15:00 UTC Message No. 5081
********************************************************************************

Author: Ron Noomen
Subject: Delft QL Report March 19, 2005


WEGENER-2 IERS

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


March 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, Mar 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,
Mar 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
------------------------------------------------------------------------------
1873 Simeiz, Crimea, Ukraine 050317 - 050318 1 -
7080 McDonald Obs., Fort Davis, TX 050317 - 050317 1 1
7105 Greenbelt, Maryland 050318 - 050318 - 2
7110 Monument Peak, California 050317 - 050317 1 1
7237 Changchun, China 050318 - 050318 1 2
7249 Beijing, China 050317 - 050318 2 5
7825 Mount Stromlo, Australia 050317 - 050317 3 1
7832 Riyad, Saudi Arabia 050318 - 050319 2 3
7835 Grasse, France 050317 - 050318 - 1
7837 Shanghai Observatory, China 050317 - 050318 2 5
7838 Simosato Observatory, Japan 050318 - 050318 1 1
7839 Graz, Austria 050317 - 050318 4 2
7840 Herstmonceux, United Kingdom 050318 - 050318 2 -
7941 Matera, Italy (MLRO 532) 050317 - 050319 2 6
------ ------ --- ---
TOTAL 050317 - 050319 22 30
------------------------------------------------------------------------------


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, Mar 11, 2005 to Sat, Mar 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 18 19
Number of Passes 105/105 129/127
Number of Normal Points 1134/1119 1449/1420
Weighted RMS of Fit (mm) 12 11
-----------------------------------------------------------------------


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 1873 (Simeiz) (position fixed, acc. 200 mm)
1873 16 Mar 05 22:22 LAG2 1 0 148 0 +- 0 0 +- 0 0
1873 17 Mar 05 23:57 LAG1 8 0 889 782 +- 212 -268 +- 198 295*CHK*

Station 1884 (Riga) (position fixed, acc. 100 mm)
1884 13 Mar 05 23:40 LAG2 9 0 43 40 +- 129 -4 +- 119 5
1884 15 Mar 05 23:49 LAG2 13 0 30 28 +- 112 0 +- 84 7

Station 7080 (McDonald Obs.) (position fixed, acc. 20 mm)
7080 11 Mar 05 04:31 LAG2 9 0 24 7 +- 22 -15 +- 14 2
7080 11 Mar 05 08:33 LAG2 15 0 10 1 +- 17 -8 +- 16 5
7080 11 Mar 05 10:16 LAG1 15 0 6 5 +- 20 0 +- 12 3
7080 11 Mar 05 12:45 LAG2 7 0 16 -1 +- 96 9 +- 65 4
7080 12 Mar 05 06:40 LAG2 13 0 7 -8 +- 20 3 +- 17 2
7080 12 Mar 05 08:45 LAG1 17 0 6 3 +- 16 2 +- 12 4
7080 12 Mar 05 10:43 LAG2 11 0 6 -6 +- 20 -2 +- 18 2
7080 12 Mar 05 12:31 LAG1 13 0 22 5 +- 32 -14 +- 18 2
7080 16 Mar 05 20:45 LAG1 7 0 4 -4 +- 50 4 +- 39 3
7080 17 Mar 05 17:51 LAG2 4 0 29 64 +- 155 -56 +- 216 12
7080 17 Mar 05 19:12 LAG1 9 0 6 1 +- 22 0 +- 16 6

Station 7090 (Yarragadee) (position fixed, acc. 10 mm)
7090 11 Mar 05 11:43 LAG2 3 0 4 -52 +- 676 21 +- 292 0
7090 11 Mar 05 11:49 LAG1 4 0 5 1 +- 29 -7 +- 75 3
7090 11 Mar 05 14:57 LAG1 12 0 4 1 +- 12 4 +- 14 2
7090 11 Mar 05 15:21 LAG2 7 0 8 -11 +- 22 9 +- 31 3
7090 11 Mar 05 18:19 LAG1 17 0 13 4 +- 10 7 +- 5 1
7090 12 Mar 05 07:09 LAG1 6 0 16 -13 +- 38 0 +- 34 10
7090 12 Mar 05 13:18 LAG2 7 0 3 -1 +- 16 2 +- 14 1
7090 15 Mar 05 11:23 LAG2 25 0 6 5 +- 8 1 +- 4 1
7090 15 Mar 05 19:55 LAG1 19 0 4 2 +- 9 1 +- 6 2
7090 16 Mar 05 13:45 LAG2 18 0 11 -4 +- 10 9 +- 8 1
7090 16 Mar 05 18:49 LAG1 10 0 22 -10 +- 32 14 +- 15 1

Station 7105 (Greenbelt) (position fixed, acc. 10 mm)
7105 15 Mar 05 01:11 LAG2 15 0 7 3 +- 10 -7 +- 12 2
7105 15 Mar 05 05:05 LAG2 11 0 10 -5 +- 12 -5 +- 8 1
7105 15 Mar 05 08:09 LAG1 16 0 16 15 +- 12 -11 +- 7 2
7105 15 Mar 05 09:11 LAG2 3 0 6 -25 +- 583 -15 +- 280 1
7105 16 Mar 05 03:27 LAG2 9 0 2 3 +- 23 -4 +- 20 0
7105 18 Mar 05 03:23 LAG2 5 0 9 -31 +- 141 -20 +- 72 2
7105 18 Mar 05 07:37 LAG2 10 0 5 -3 +- 13 -3 +- 13 1

Station 7110 (Monument Peak) (position fixed, acc. 10 mm)
7110 11 Mar 05 04:37 LAG2 8 0 10 5 +- 18 -13 +- 19 1
7110 11 Mar 05 08:25 LAG2 9 0 11 0 +- 14 -7 +- 9 3
7110 11 Mar 05 10:19 LAG1 7 0 6 0 +- 19 -2 +- 10 4
7110 11 Mar 05 12:35 LAG2 9 0 6 -5 +- 14 0 +- 7 3
7110 12 Mar 05 06:39 LAG2 6 0 5 -4 +- 19 2 +- 34 1
7110 12 Mar 05 08:57 LAG1 10 0 8 -7 +- 16 0 +- 21 3
7110 12 Mar 05 10:49 LAG2 8 0 4 -2 +- 15 -5 +- 29 1
7110 12 Mar 05 12:31 LAG1 4 0 2 0 +- 29 -5 +- 55 0
7110 12 Mar 05 14:59 LAG2 7 0 9 -3 +- 16 0 +- 11 8
7110 14 Mar 05 06:38 LAG2 3 0 11 8 +- 39 11 +- 26 0
7110 14 Mar 05 15:15 LAG2 8 0 19 -13 +- 15 -6 +- 11 3
7110 15 Mar 05 04:47 LAG2 18 0 18 14 +- 10 -6 +- 7 2
7110 15 Mar 05 08:55 LAG2 11 0 5 0 +- 12 -3 +- 11 3
7110 15 Mar 05 11:45 LAG1 9 0 35 17 +- 21 -10 +- 11 5
7110 15 Mar 05 13:09 LAG2 8 0 9 -11 +- 21 -4 +- 18 2
7110 16 Mar 05 03:11 LAG2 6 0 4 -3 +- 17 1 +- 56 1
7110 16 Mar 05 10:21 LAG1 4 0 20 25 +- 306 2 +- 136 0
7110 16 Mar 05 11:17 LAG2 9 0 7 6 +- 14 -2 +- 25 2
7110 16 Mar 05 14:03 LAG1 6 0 14 -15 +- 18 -7 +- 32 1
7110 16 Mar 05 15:41 LAG2 7 0 8 -6 +- 52 10 +- 37 1
7110 16 Mar 05 20:53 LAG1 7 0 14 -21 +- 50 18 +- 30 6
7110 17 Mar 05 12:37 LAG1 5 0 13 0 +- 78 -8 +- 50 1
7110 17 Mar 05 13:25 LAG2 7 0 6 -1 +- 15 -3 +- 9 2

Station 7237 (Changchun) (position fixed, acc. 50 mm)
7237 12 Mar 05 18:34 LAG2 2 0 32 227 +-4250 -125 +-2065 0
7237 12 Mar 05 19:58 LAG1 4 0 33 27 +- 87 -20 +- 187 4
7237 13 Mar 05 12:39 LAG2 2 0 30 100 +-2252 -82 +-1418 0
7237 13 Mar 05 16:23 LAG2 10 0 25 22 +- 118 -27 +- 75 8
7237 13 Mar 05 18:25 LAG1 7 0 22 -2 +- 62 10 +- 41 14
7237 14 Mar 05 14:25 LAG2 5 0 9 -5 +- 79 -4 +- 89 2
7237 18 Mar 05 14:57 LAG2 9 0 19 -4 +- 135 -8 +- 79 5
7237 18 Mar 05 18:39 LAG1 7 0 17 2 +- 187 -8 +- 116 8
7237 18 Mar 05 19:01 LAG2 7 0 7 7 +- 113 -4 +- 71 6

Station 7249 (Beijing) (position solved, acc. 50 mm)
7249 11 Mar 05 16:15 LAG2 8 0 39 -61 +- 482 40 +- 207 20
7249 11 Mar 05 17:49 LAG1 12 0 11 0 +- 57 7 +- 57 9
7249 11 Mar 05 19:57 LAG2 16 0 13 9 +- 38 0 +- 34 9
7249 11 Mar 05 21:31 LAG1 5 0 8 -6 +- 159 1 +- 140 6
7249 12 Mar 05 14:17 LAG2 9 0 17 27 +- 200 -11 +- 111 14
7249 12 Mar 05 18:03 LAG2 17 0 25 -1 +- 44 -16 +- 32 9
7249 12 Mar 05 19:53 LAG1 15 0 34 16 +- 39 4 +- 22 29
7249 14 Mar 05 18:19 LAG2 7 0 13 6 +- 57 -4 +- 75 11
7249 14 Mar 05 20:44 LAG1 8 0 15 0 +- 54 2 +- 54 15
7249 15 Mar 05 16:14 LAG2 12 0 37 28 +- 44 17 +- 32 8
7249 15 Mar 05 19:21 LAG1 11 0 16 6 +- 46 -1 +- 39 14
7249 16 Mar 05 14:21 LAG2 10 0 32 11 +- 51 -10 +- 42 25
7249 16 Mar 05 17:57 LAG1 14 0 30 -23 +- 41 -10 +- 40 14
7249 16 Mar 05 18:29 LAG2 14 0 20 -17 +- 41 8 +- 40 7
7249 17 Mar 05 12:29 LAG2 6 0 262 732 +- 189 530 +- 155 90*CHK*
7249 17 Mar 05 16:29 LAG2 17 0 22 -1 +- 37 0 +- 27 22
7249 17 Mar 05 20:03 LAG1 15 0 9 -7 +- 44 -1 +- 28 7
7249 17 Mar 05 20:33 LAG2 18 0 21 -1 +- 36 -10 +- 25 15
7249 18 Mar 05 14:42 LAG2 14 0 21 -16 +- 59 8 +- 33 17
7249 18 Mar 05 18:36 LAG2 12 0 57 -2 +- 71 32 +- 56 38
7249 18 Mar 05 19:01 LAG1 11 0 14 -24 +- 117 13 +- 62 11

Station 7501 (Hartebeesthoek) (position fixed, acc. 10 mm)
7501 11 Mar 05 03:12 LAG1 3 0 17 -16 +- 89 1 +- 137 2

Station 7811 (Borowiec) (position fixed, acc. 60 mm)
7811 14 Mar 05 21:42 LAG2 7 0 11 9 +- 69 -1 +- 47 6
7811 15 Mar 05 03:58 LAG1 5 0 37 89 +- 295 30 +- 149 12

Station 7824 (San Fernando) (position fixed, acc. 40 mm)
7824 13 Mar 05 23:16 LAG2 3 0 55 178 +- 691 61 +- 340 1
7824 16 Mar 05 03:03 LAG1 3 0 104 119 +- 157 30 +- 302 0

Station 7825 (Mount Stromlo) (position solved, acc. 10 mm)
7825 11 Mar 05 03:19 LAG2 11 1 4 14 +- 73 -7 +- 38 3
7825 11 Mar 05 04:33 LAG1 13 0 15 -13 +- 11 -7 +- 11 2
7825 11 Mar 05 07:37 LAG2 9 0 5 29 +- 76 -16 +- 41 1
7825 11 Mar 05 07:59 LAG1 16 0 10 0 +- 10 -5 +- 6 3
7825 11 Mar 05 11:19 LAG2 6 0 10 -7 +- 17 4 +- 10 1
7825 11 Mar 05 11:35 LAG1 8 0 8 -6 +- 24 -2 +- 26 0
7825 11 Mar 05 14:47 LAG1 17 0 4 -3 +- 11 2 +- 6 2
7825 11 Mar 05 18:35 LAG1 8 0 6 0 +- 50 -3 +- 34 2
7825 12 Mar 05 05:27 LAG2 5 0 12 12 +- 46 0 +- 69 1
7825 12 Mar 05 06:43 LAG1 19 0 10 2 +- 10 4 +- 5 2
7825 12 Mar 05 09:23 LAG2 21 0 17 10 +- 9 6 +- 6 2
7825 12 Mar 05 10:09 LAG1 13 0 4 0 +- 11 4 +- 11 1
7825 12 Mar 05 13:33 LAG1 12 0 8 2 +- 15 -7 +- 12 1
7825 12 Mar 05 16:53 LAG1 14 0 18 -18 +- 11 -4 +- 8 3
7825 13 Mar 05 03:24 LAG2 12 1 18 3 +- 31 -13 +- 22 11
7825 13 Mar 05 05:15 LAG1 19 0 15 0 +- 9 -5 +- 5 11
7825 13 Mar 05 07:25 LAG2 22 0 33 22 +- 9 -23 +- 6 4
7825 13 Mar 05 08:57 LAG1 13 1 13 5 +- 15 -12 +- 13 2
7825 13 Mar 05 11:23 LAG2 19 0 6 5 +- 9 0 +- 6 3
7825 13 Mar 05 12:11 LAG1 5 0 4 6 +- 48 5 +- 57 3
7825 13 Mar 05 15:29 LAG1 21 0 10 -5 +- 9 5 +- 5 3
7825 13 Mar 05 19:23 LAG1 5 0 6 7 +- 59 -3 +- 77 4
7825 14 Mar 05 01:13 LAG2 19 0 11 11 +- 11 -4 +- 7 5
7825 14 Mar 05 04:05 LAG1 8 0 25 7 +- 20 15 +- 16 3
7825 14 Mar 05 05:39 LAG2 4 0 12 13 +- 24 -13 +- 98 2
7825 14 Mar 05 07:35 LAG1 15 0 13 9 +- 13 1 +- 8 5
7825 14 Mar 05 09:57 LAG2 11 0 50 10 +- 43 20 +- 22 2
7825 14 Mar 05 14:13 LAG1 17 0 4 -1 +- 11 2 +- 7 3
7825 14 Mar 05 18:13 LAG1 3 0 13 31 +- 746 -7 +- 329 0
7825 15 Mar 05 06:09 LAG1 19 0 12 -8 +- 10 -3 +- 5 3
7825 15 Mar 05 07:37 LAG2 17 0 9 7 +- 10 -2 +- 6 4
7825 17 Mar 05 10:31 LAG1 3 0 9 -8 +- 32 -2 +- 140 2
7825 17 Mar 05 12:05 LAG2 11 0 6 -6 +- 16 7 +- 20 2
7825 17 Mar 05 14:07 LAG1 3 0 6 84 +- 579 -36 +- 245 4
7825 17 Mar 05 17:09 LAG1 14 0 4 -3 +- 11 1 +- 9 2

Station 7832 (Riyad) (position solved, acc. 20 mm)
7832 11 Mar 05 23:27 LAG2 11 0 12 16 +- 27 11 +- 34 2
7832 12 Mar 05 01:10 LAG1 5 0 12 -11 +- 148 -13 +- 80 1
7832 14 Mar 05 00:07 LAG2 6 0 17 -12 +- 124 23 +- 109 9
7832 15 Mar 05 00:43 LAG1 11 0 4 -1 +- 20 3 +- 17 2
7832 15 Mar 05 02:09 LAG2 10 0 15 -14 +- 21 4 +- 35 4
7832 15 Mar 05 06:15 LAG2 7 0 12 -1 +- 37 -18 +- 52 1
7832 15 Mar 05 23:09 LAG1 11 0 4 7 +- 43 2 +- 25 2
7832 16 Mar 05 00:13 LAG2 9 0 7 -6 +- 32 4 +- 49 5
7832 18 Mar 05 22:13 LAG2 11 0 13 -3 +- 24 14 +- 31 3
7832 18 Mar 05 22:34 LAG1 8 0 8 -34 +- 95 -17 +- 53 2

Station 7835 (Grasse) (position fixed, acc. 30 mm)
7835 11 Mar 05 02:53 LAG1 6 0 26 33 +- 181 -4 +- 102 1
7835 15 Mar 05 23:41 LAG2 19 0 5 3 +- 22 2 +- 15 1
7835 16 Mar 05 21:53 LAG2 11 0 2 2 +- 29 0 +- 31 1
7835 17 Mar 05 23:57 LAG2 9 0 6 8 +- 48 -3 +- 23 2

Station 7837 (Shanghai Observatory) (position fixed, acc. 50 mm)
7837 12 Mar 05 17:59 LAG2 18 0 20 15 +- 37 -13 +- 32 7
7837 12 Mar 05 19:57 LAG1 10 0 14 7 +- 48 -5 +- 25 5
7837 13 Mar 05 12:05 LAG2 10 0 13 -6 +- 49 -16 +- 79 8
7837 13 Mar 05 15:55 LAG2 22 0 12 7 +- 33 -6 +- 20 5
7837 13 Mar 05 18:29 LAG1 21 0 31 20 +- 33 12 +- 19 8
7837 13 Mar 05 20:18 LAG2 16 0 15 9 +- 41 -1 +- 39 11
7837 14 Mar 05 18:13 LAG2 19 0 14 -5 +- 36 -8 +- 30 7
7837 14 Mar 05 20:51 LAG1 12 0 42 29 +- 51 11 +- 37 11
7837 15 Mar 05 12:13 LAG2 15 0 13 -9 +- 39 -4 +- 40 9
7837 17 Mar 05 12:38 LAG2 3 0 1227 1228 +- 88 16 +- 381 7*CHK*
7837 17 Mar 05 16:35 LAG2 14 0 14 3 +- 49 -10 +- 40 8
7837 17 Mar 05 20:09 LAG1 15 0 15 11 +- 39 5 +- 24 6
7837 17 Mar 05 20:47 LAG2 16 0 10 -5 +- 38 -5 +- 37 6
7837 18 Mar 05 14:59 LAG2 8 0 26 -38 +- 425 27 +- 187 12
7837 18 Mar 05 18:51 LAG2 8 0 8 -1 +- 56 11 +- 112 6
7837 18 Mar 05 19:09 LAG1 8 0 35 0 +- 236 16 +- 110 10

Station 7838 (Simosato Observatory) (position fixed, acc. 30 mm)
7838 13 Mar 05 05:59 LAG1 20 0 7 2 +- 22 -2 +- 13 5
7838 13 Mar 05 12:01 LAG2 21 0 46 43 +- 21 -11 +- 14 15
7838 16 Mar 05 05:25 LAG1 20 0 19 12 +- 22 5 +- 12 7
7838 18 Mar 05 06:17 LAG1 10 0 8 8 +- 37 -2 +- 21 3
7838 18 Mar 05 10:37 LAG2 19 0 28 25 +- 22 11 +- 19 2

Station 7839 (Graz) (position fixed, acc. 10 mm)
7839 11 Mar 05 05:17 LAG2 19 0 7 4 +- 9 -3 +- 6 1
7839 11 Mar 05 05:56 LAG1 19 0 10 -10 +- 9 1 +- 5 1
7839 13 Mar 05 19:39 LAG2 12 0 9 -7 +- 15 -1 +- 11 3
7839 13 Mar 05 23:29 LAG2 19 0 10 0 +- 10 4 +- 4 1
7839 14 Mar 05 01:55 LAG1 9 0 19 1 +- 14 11 +- 8 3
7839 14 Mar 05 03:51 LAG2 18 0 15 12 +- 16 1 +- 9 2
7839 14 Mar 05 05:23 LAG1 10 0 9 9 +- 15 5 +- 10 1
7839 14 Mar 05 12:22 LAG1 12 0 12 -12 +- 13 5 +- 7 2
7839 14 Mar 05 21:27 LAG2 8 0 13 -4 +- 15 -6 +- 7 1
7839 15 Mar 05 00:21 LAG1 6 0 26 -3 +- 23 19 +- 19 1
7839 15 Mar 05 01:45 LAG2 4 0 3 6 +- 122 1 +- 88 0
7839 15 Mar 05 07:51 LAG1 8 0 7 23 +- 54 -10 +- 29 1
7839 15 Mar 05 10:49 LAG1 17 0 16 -7 +- 10 -7 +- 5 0
7839 15 Mar 05 14:27 LAG1 16 0 7 -2 +- 10 -4 +- 7 1
7839 15 Mar 05 19:39 LAG2 18 0 9 -4 +- 10 4 +- 7 1
7839 15 Mar 05 23:09 LAG1 10 0 5 0 +- 13 9 +- 25 1
7839 15 Mar 05 23:37 LAG2 14 0 6 -2 +- 11 4 +- 7 0
7839 16 Mar 05 02:43 LAG1 10 0 12 11 +- 13 -1 +- 7 4
7839 16 Mar 05 04:05 LAG2 8 0 13 14 +- 17 -2 +- 23 0
7839 16 Mar 05 07:53 LAG2 16 0 4 3 +- 10 -2 +- 8 0
7839 16 Mar 05 09:31 LAG1 12 0 5 -1 +- 12 2 +- 7 1
7839 16 Mar 05 13:03 LAG1 19 0 4 -4 +- 10 0 +- 4 1
7839 16 Mar 05 21:41 LAG2 18 0 9 -7 +- 9 2 +- 5 2
7839 17 Mar 05 01:19 LAG1 8 0 10 5 +- 14 5 +- 8 3
7839 17 Mar 05 01:53 LAG2 13 0 8 1 +- 11 5 +- 7 1
7839 17 Mar 05 04:43 LAG1 25 0 7 2 +- 8 2 +- 4 4
7839 17 Mar 05 05:51 LAG2 26 0 4 2 +- 8 -2 +- 4 1
7839 17 Mar 05 08:14 LAG1 7 0 13 14 +- 19 4 +- 18 1
7839 17 Mar 05 12:03 LAG1 11 0 13 9 +- 45 -9 +- 20 2
7839 17 Mar 05 19:53 LAG2 13 0 8 -6 +- 11 -3 +- 7 3
7839 18 Mar 05 13:47 LAG1 16 0 4 3 +- 10 0 +- 6 2

Station 7840 (Herstmonceux) (position fixed, acc. 20 mm)
7840 12 Mar 05 07:23 LAG2 19 0 13 13 +- 15 0 +- 11 2
7840 12 Mar 05 08:19 LAG1 11 0 11 13 +- 24 -3 +- 20 2
7840 12 Mar 05 21:29 LAG2 14 0 20 0 +- 17 -20 +- 18 1
7840 13 Mar 05 01:25 LAG2 20 0 13 2 +- 16 -8 +- 10 2
7840 13 Mar 05 03:23 LAG1 13 0 23 22 +- 21 -14 +- 13 5
7840 13 Mar 05 06:47 LAG1 17 0 23 15 +- 16 -10 +- 9 6
7840 13 Mar 05 10:41 LAG1 4 0 23 12 +- 331 -17 +- 159 0
7840 14 Mar 05 21:37 LAG2 9 0 2 2 +- 24 1 +- 25 2
7840 15 Mar 05 01:33 LAG2 13 0 4 2 +- 19 -1 +- 10 3
7840 15 Mar 05 04:05 LAG1 20 0 21 15 +- 15 -8 +- 8 8
7840 15 Mar 05 05:37 LAG2 24 0 16 10 +- 13 -7 +- 8 4
7840 16 Mar 05 09:59 LAG1 7 0 8 15 +- 64 -6 +- 45 3
7840 18 Mar 05 10:28 LAG1 16 0 16 4 +- 16 -10 +- 11 5
7840 18 Mar 05 14:01 LAG1 14 0 6 3 +- 17 1 +- 10 4

Station 7841 (Potsdam) (position solved, acc. 10 mm)
7841 16 Mar 05 21:57 LAG2 12 0 4 0 +- 12 0 +- 12 4

Station 7941 (Matera) (position solved, acc. 10 mm)
7941 11 Mar 05 09:33 LAG2 6 0 7 -5 +- 17 5 +- 58 5
7941 11 Mar 05 13:15 LAG1 3 0 12 11 +- 342 0 +- 154 1
7941 11 Mar 05 23:17 LAG2 18 0 5 0 +- 10 2 +- 6 3
7941 12 Mar 05 01:23 LAG1 11 0 6 -10 +- 25 7 +- 17 2
7941 12 Mar 05 03:17 LAG2 12 0 22 8 +- 12 9 +- 6 8
7941 12 Mar 05 04:53 LAG1 7 0 7 9 +- 20 -3 +- 22 1
7941 12 Mar 05 07:31 LAG2 15 0 10 10 +- 11 3 +- 10 2
7941 12 Mar 05 21:57 LAG2 3 0 60 39 +- 620 -41 +- 261 4
7941 12 Mar 05 23:47 LAG1 6 0 10 1 +- 38 17 +- 60 1
7941 13 Mar 05 01:33 LAG2 8 0 7 -2 +- 18 -11 +- 26 2
7941 13 Mar 05 03:27 LAG1 8 0 15 9 +- 15 -12 +- 12 2
7941 13 Mar 05 19:39 LAG2 5 0 11 -8 +- 42 4 +- 68 2
7941 13 Mar 05 23:55 LAG2 9 0 7 -10 +- 74 1 +- 36 0
7941 14 Mar 05 05:37 LAG1 9 0 6 6 +- 16 0 +- 17 2
7941 14 Mar 05 07:42 LAG2 14 0 8 1 +- 11 7 +- 10 3
7941 16 Mar 05 13:25 LAG1 6 0 9 -3 +- 94 -2 +- 46 3
7941 16 Mar 05 21:47 LAG2 10 0 6 -6 +- 13 0 +- 9 1
7941 17 Mar 05 01:17 LAG1 12 0 12 5 +- 14 9 +- 9 4
7941 17 Mar 05 01:49 LAG2 14 0 10 -5 +- 11 4 +- 7 3
7941 17 Mar 05 05:19 LAG1 3 0 7 -38 +- 268 23 +- 141 2
7941 17 Mar 05 19:51 LAG2 9 0 11 -16 +- 27 -4 +- 17 3
7941 17 Mar 05 23:51 LAG2 12 0 7 -5 +- 12 -1 +- 6 0
7941 18 Mar 05 03:28 LAG1 5 0 14 8 +- 19 -8 +- 12 3
7941 18 Mar 05 04:01 LAG2 15 0 8 0 +- 11 -5 +- 8 3
7941 18 Mar 05 08:13 LAG2 9 0 9 -11 +- 18 -4 +- 26 2
--------------------------------------------------------------------------------



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 - 050303 0/ 20/ 0 0/ 24/ 0 44
1831 LVIL 040815 - 050303 0/ 25/ 0 0/ 31/ 0 56
1864 MD2LAS 040701 - 050310 0/ 88/ 0 0/ 78/ 0 166
1873 SIMLAS 040703 - 050318 0/ 26/ 0 0/ 16/ 0 42
1884 RIGLAS 040712 - 050316 0/ 43/ 1 0/ 27/ 2 73
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 - 050317 56/ 62/ 4 52/ 77/ 6 257
7090 ML0514 040716 - 050316 135/382/ 35 116/255/ 28 951
7105 ML0725 040701 - 050318 0/ 86/ 4 2/107/ 7 206
7110 ML0414 040701 - 050317 76/134/ 17 79/141/ 20 467
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 - 050318 0/147/ 1 0/160/ 1 309
7249 BEJLAS 040701 - 050318 0/105/ 0 0/130/ 0 235
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 - 050209 5/ 28/ 0 3/ 10/ 0 46
7501 ML0616 040701 - 050311 21/ 35/ 3 58/ 76/ 6 199
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 - 050315 0/ 54/ 0 0/ 64/ 0 118
7824 SPNLAS 040701 - 050316 0/106/ 0 0/ 99/ 0 205
7825 STL3 040807 - 050317 135/205/ 36 129/144/ 23 672
7832 SALRO 040702 - 050319 144/219/ 19 186/253/ 24 845
7835 GRASSE 040702 - 050318 0/ 49/ 2 0/ 41/ 2 94
7836 GFZLAS 040701 - 040701 0/ 1/ 0 0/ 0/ 0 1
7837 CHILAS 040704 - 050318 0/ 98/ 0 0/138/ 2 238
7838 SHOLAS 040701 - 050318 61/120/ 4 80/147/ 7 419
7839 AUSLAS 040701 - 050318 199/173/ 29 93/165/ 23 682
7840 RGOLAS 040701 - 050318 134/103/ 24 80/ 94/ 14 449
7841 GFZLA3 040702 - 050316 44/ 60/ 15 25/ 66/ 8 218
7845 GRASLL 040705 - 040920 11/ 14/ 0 3/ 12/ 1 41
7941 MLROnn 040701 - 050319 94/ 66/ 10 79/ 77/ 7 333
8834 WLRS01 040701 - 050304 205/137/ 26 129/143/ 19 659
--------------------------------------------------------------------------


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)
--------------------------------------------------------------
050312.0 0.2 +/- 0.1 220.5 +/- 0.1 -32618.49 +/- 0.01
050313.0 -1.5 +/- 0.1 222.1 +/- 0.1 -32619.77 +/- 0.02
050314.0 -2.6 +/- 0.1 222.3 +/- 0.1 -32620.84 +/- 0.03
050315.0 -4.2 +/- 0.1 223.0 +/- 0.1 -32621.60 +/- 0.04
050316.0 -5.5 +/- 0.1 223.5 +/- 0.1 -32622.08 +/- 0.05
050317.0 -6.9 +/- 0.1 223.5 +/- 0.1 -32622.31 +/- 0.05
050318.0 -7.9 +/- 0.1 224.2 +/- 0.1 -32622.49 +/- 0.06
--------------------------------------------------------------



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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