LIBREVILLE DORIS site description form

0. Form
   Prepared by       : SIMB (DORIS installation and maintenance department)
   Date prepared     : 6/05/2004
   Report type       : UPDATE

1. Site location information
   Site name               : LIBREVILLE
   Site DOMES number       : 32809
   Host agency             : CNES / STATION ARIANE
   City                    : N'Koltang
   State or province       : 
   Country                 : GABON
   Tectonic plate          : AFRC
   Geological information  : 
                             
   Geographical coordinates (ITRF) : 
          North Latitude   :    0 deg 21' 15''
          East Longitude   :    9 deg 40' 20''
          Ellipsoid height :   35 m
   Approximate altitude    :   25 m

2. DORIS antenna and reference point information

2.1
   Four character ID        : LIBA
   Antenna model            : Alcatel
   Antenna serial number    : 
   IERS DOMES number        : 32809S002
   CNES/IGN number          : 328091
   CTDP number              : 13
   Date installed (dd/mm/yy): 10/01/1988
   Date removed (dd/mm/yy)  : 04/02/1999
   Antenna support type     : 1 metre tower
   Installed on             : The side wall of a one storied building
   Height above ground mark : 3.411 m
   Ground mark type         : Brass mark 20 mm diameter fixed in the basement of 
                            : the building.
   Ground mark DOMES number : 32809M003
   Notes                    : 

2.2
   Four character ID        : LIBB
   Antenna model            : Starec 52290 type
   Antenna serial number    : 44
   IERS DOMES number        : 32809S003
   CNES/IGN number          : 328092
   CTDP number              : 85
   Date installed (dd/mm/yy): 07/02/1999
   Date removed (dd/mm/yy)  : 
   Antenna support type     : 1 metre tower
   Installed on             : The side wall of a one storied building
   Height above ground mark : 3.663 m
   Ground mark type         : Brass mark 20 mm diameter fixed in the basement of 
                            : the building.
   Ground mark DOMES number : 32809M003
   Notes                    : 


3. DORIS beacons information

3.1
   Beacon serial number        : 86 27 013
   Beacon model                : 1.0
   USO serial number           : 1.413
   4 Char. ID of the REF point : LIBA
   Date installed (dd/mm/yy)   : 15/06/1990
   Date removed (dd/mm/yy)     : 20/07/1995

3.2
   Beacon serial number        : 86 27 010
   Beacon model                : 1.0
   USO serial number           : 1.413
   4 Char. ID of the REF point : LIBA
   Date installed (dd/mm/yy)   : 06/11/1995
   Date removed (dd/mm/yy)     : 04/02/1999

3.3
   Beacon serial number        : 86 27 010
   Beacon model                : 1.0
   USO serial number           : 1.413
   4 Char. ID of the REF point : LIBB
   Date installed (dd/mm/yy)   : 07/02/1999
   Date removed (dd/mm/yy)     : 


4. ITRF coordinates and velocities of the current DORIS ref. point (LIBB)
   Solution : ITRF2000
   Epoch    : 1997.0
   X = 6287388.836 m     Y = 1071574.275 m     Z = 39147.138 m
   Sig X = 0.007 m         Sig Y = 0.008 m         Sig Z = 0.004 m
   VX = -0.0076 m/y        VY = 0.0138 m/y        VZ = 0.0177 m/y
   Sig VX = 0.0022 m/y     Sig VY = 0.0024 m/y     Sig VZ = 0.0013 m/y

5. IERS colocation information
5.1
   Instrument type       : GPS
   Status                : Permanent
   DOMES number of the
   instrument ref. point : 32809M002
   Notes                 : 

6. Tide Gauge colocation information

7. Local site ties
7.1
   Point description      : DORIS mark in the concrete base of the building
   DOMES number           : 32809M003
   Differential components from the current DORIS ref. point (LIBB)
   to the above point (in the ITRS) :
                   dX (m) : -3.611
                   dY (m) : -0.612
                   dZ (m) : -0.025
   Accuracy (m)           : 0.001
   Date measured          : 02/1999
   Additional information : 
7.2
   Point description      : DORIS Alcatel antenna reference point (LIBA)
   DOMES number           : 32809S002
   Differential components from the current DORIS ref. point (LIBB)
   to the above point (in the ITRS) :
                   dX (m) : -0.248
                   dY (m) : -0.047
                   dZ (m) : 0.000
   Accuracy (m)           : 0.002
   Date measured          : 02/1999
   Additional information : 
7.3
   Point description      : Mark in concrete block (NKLG)
   DOMES number           : 32809M002
   Differential components from the current DORIS ref. point (LIBB)
   to the above point (in the ITRS) :
                   dX (m) : -2.993
                   dY (m) : 0.110
                   dZ (m) : -14.392
   Accuracy (m)           : 0.001
   Date measured          : 02/1999
   Additional information : 

8. Meteorological Instrumentation

8.1 Humidity sensor
   Model           : MUC.1 + transmitter M-UTN3
   Manufacturer    : SPSI
   Accuracy        : 
   Notes           : 

8.2 Pressure sensor
   Model           : M-PaTN.8
   Manufacturer    : SPSI
   Accuracy        : 
   Height          : -0.35 m above the current DORIS ref. point (LIBB)
   Notes           : 

8.3 Temperature sensor
   Model           : Constructed for DORIS beacons
   Manufacturer    : CEIS-TM
   Accuracy        : 
   Notes           : 


9. DORIS network contacts

   Primary contact:

   Name                : Herve FAGARD
   Agency              : Institut Geographique National
   Mailing address     : Service de Geodesie et de Nivellement
                       : 2 Avenue PASTEUR
                       : 94165 SAINT-MANDE CEDEX    FRANCE
   Telephone           : + 33 1 43 98 81 48
   Fax                 : + 33 1 43 98 84 50
   E-mail              : herve.fagard@ign.fr

   Secondary contact:

   Name                : Francois BOLDO
   Agency              : Institut Geographique National
   Mailing address     : CNES (ED/AL/MA)
                       : 18 Avenue Edouard BELIN
                       : 31401 TOULOUSE Cedex    FRANCE
   Telephone           : + 33 5 61 27 40 72
   Fax                 : + 33 5 61 28 25 95
   E-mail              : Simb.Doris@cnes.fr