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dorismail               30-May-2012 15:11:28 Message No 0825
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Author: "Jerome SAUNIER" <jerome.saunier@ign.fr>
Subject: Network / Antenna change and raising at Greenbelt


#### BEGIN HEADER ####
DORISMail version 1.1
Subject: No 0825 : Network / Antenna change and raising at Greenbelt
#### END HEADER ####

Dear colleagues,

The antenna of the DORIS station at Greenbelt (USA, MD) has been replaced
and the antenna support has been modified in the frame of a global action
aiming at removing bend connectors and standardizing the antenna support
models.

The antenna is now supported by a 40 cm high stainless steel structure, set
on the same concrete pillar.

The transmissions from the former antenna location (GREB) stopped on May 10,
and resumed on May 14 after the antenna raising and change.

Please find below the installation characteristics and the coordinates of
the new reference point :

Concerned site:
#### BEGIN SITE ####
Site name         : GREENBELT     ####
Site DOMES number : 40451     ####
#### END SITE ####

Characteristics of the new point:
#### BEGIN STATION ####
Four character ID           : GRFB     ####
Antenna model               : Starec 52291 type     ####
Station DOMES number        : 40451S178     ####
Date installed (dd/mm/yyyy) : 14/05/2012     ####
Antenna support type        : stainless steel structure 40cm high     ####
Installed on                : concrete pillar 1.8m high     ####
#### END STATION ####

The coordinates of the DORIS antenna reference point are:
#### BEGIN COORDINATES ####
Solution : ITRF2008     ####
Note about the coordinates : tie to GREB     ####
Epoch    : 2005.0     ####
Unit     : metre     ####
X        : 1130711.237     ####
Y        : -4831391.916     ####
Z        : 3994061.383     ####
Sig X    : 0.002     ####
Sig Y    : 0.002     ####
Sig Z    : 0.002     ####
#### END COORDINATES ####

The ITRF velocities for the site are:
#### BEGIN VELOCITIES ####
Note about the velocities :      ####
Unit     : metre / year     ####
VX       : -0.0146     ####
VY       : -0.0027     ####
VZ       : 0.0021     ####
Sig VX   : .0005     ####
Sig VY   : .0004     ####
Sig VZ   : .0003     ####
#### END VELOCITIES ####


Best regards,

Jerome Saunier
_______________________________________________________________
Reseaux et Services Internationaux
Service de Geodesie et Nivellement
IGN
73, AVENUE DE PARIS, 94165 SAINT-MANDE CEDEX
ign.fr - geoportail.fr






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