NKLG Site Information Form
     International GPS Service
     See Instructions at:
       ftp://igscb.jpl.nasa.gov/pub/station/general/sitelog_instr.txt

0.   Form

     Prepared by (full name)  : Louis Duquesne
     Date Prepared            : 2002-05-29
     Report Type              : UPDATE
     If Update:
      Previous Site Log       : nklg_20000724.log
      Modified/Added Sections : 1.0,3.1,4.1,5.1,11.0,12.0,13.0

1.  Site Identification of the GNSS Monument

     Site Name                : N'KOLTANG (GABON)
     Four Character ID        : NKLG
     Monument Inscription     : None
     IERS DOMES Number        : 32809M002
     CDP Number               : Not assigned
     Monument Description     : STEEL MAST
       Height of the Monument : 3 
       Monument Foundation    : CONCRETE BLOCK
       Foundation Depth       : (m)
     Marker Description       : BRASS NAIL
     Date Installed           : 2000-02-10
     Geologic Characteristic  : (BEDROCK/CLAY/CONGLOMERATE/GRAVEL/SAND/etc)
       Bedrock Type           : (IGNEOUS/METAMORPHIC/SEDIMENTARY)
       Bedrock Condition      : (FRESH/JOINTED/WEATHERED)
       Fracture Spacing       : (1-10 cm/11-50 cm/51-200 cm/over 200 cm)
       Fault zones nearby     : (YES/NO/Name of the zone)
         Distance/activity    : (multiple lines)
     Additional Information   : (multiple lines)
                              : Antenna supported by a guyed 3 meter tower

2.   Site Location Information

     City or Town             : Libreville
     State or Province        : 
     Country                  : Gabon
     Tectonic Plate           : 
     Approximate Position (ITRF)
       X coordinate (m)       : 6287385.872
       Y coordinate (m)       : 1071574.413
       Z coordinate (m)       : 39132.764
       Latitude (N is +)      : +002108.42
       Longitude (E is +)     : +0094011.28
       Elevation (m,ellips.)  : 31.387
     Additional Information   : Station located in the permise
                              : of  Ariane tracking station

3.  GNSS Receiver Information


3.1  Receiver Type            : TRIMBLE 4000SSI
     Satellite System         : GPS
     Serial Number            : 3919A25765
     Firmware Version         : 7.29
     Elevation Cutoff Setting : (deg)
     Date Installed           : 2000-02-10
     Date Removed             : (CCYY-MM-DDThh:mmZ)
     Temperature Stabiliz.    : (none or tolerance in degrees C)
     Additional Information   : (multiple lines)

3.x  Receiver Type            : (A20, from rcvr_ant.tab; see instructions)
     Satellite System         : (GPS/GLONASS/GPS+GLONASS)
     Serial Number            : (A5)
     Firmware Version         : (A11)
     Elevation Cutoff Setting : (deg)
     Date Installed           : (CCYY-MM-DDThh:mmZ)
     Date Removed             : (CCYY-MM-DDThh:mmZ)
     Temperature Stabiliz.    : (none or tolerance in degrees C)
     Additional Information   : (multiple lines)

4.  GNSS Antenna Information


4.1  Antenna Type             : TRM29659.00
     Serial Number            : 0220160506
     Antenna Reference Point  : BPA
     Marker->ARP Up Ecc. (m)  : 3.109m
     Marker->ARP North Ecc(m) : 000.0000
     Marker->ARP East Ecc(m)  : 000.0000
     Alignment from True N    : 
     Antenna Radome Type      : 
     Radome Serial Number     : 
     Antenna Cable Type       : (vendor & type number)
     Antenna Cable Length     : (m)
     Date Installed           : 2000-02-10
     Date Removed             : (CCYY-MM-DDThh:mmZ)
     Additional Information   : (multiple lines)

4.x  Antenna Type             : (A20, from rcvr_ant.tab; see instructions)
     Serial Number            : (A*, but note the first A5 is used in SINEX)
     Antenna Reference Point  : (BPA/BCR/XXX from "antenna.gra"; see instr.)
     Marker->ARP Up Ecc. (m)  : (F8.4)
     Marker->ARP North Ecc(m) : (F8.4)
     Marker->ARP East Ecc(m)  : (F8.4)
     Alignment from True N    : (deg; + is clockwise/east)
     Antenna Radome Type      : (A4 from rcvr_ant.tab; see instructions)
     Radome Serial Number     : 
     Antenna Cable Type       : (vendor & type number)
     Antenna Cable Length     : (m)
     Date Installed           : (CCYY-MM-DDThh:mmZ)
     Date Removed             : (CCYY-MM-DDThh:mmZ)
     Additional Information   : (multiple lines)

5.  Surveyed Local Ties


5.1  Tied Marker Name         : DORIS antenna ref. pt. (LIBA)
     Tied Marker Usage        : (SLR/VLBI/LOCAL CONTROL/FOOTPRINT/etc)
     Tied Marker CDP Number   : 
     Tied Marker DOMES Number : 32809S002
     Differential Components from GNSS Marker to the tied monument (ITRS)
       dx (m)                 : 
       dy (m)                 : -0.157
       dz (m)                 : 14.392
     Accuracy (mm)            : 2
     Survey method            : GPS CAMPAIGN/TRIANGULATION
     Date Measured            : 1999-02-01
     Additional Information   : Survey by IGN-FRANCE
                              : Exact date in Feb 1999 not known

5.x  Tied Marker Name         : 
     Tied Marker Usage        : (SLR/VLBI/LOCAL CONTROL/FOOTPRINT/etc)
     Tied Marker CDP Number   : (A4)
     Tied Marker DOMES Number : (A9)
     Differential Components from GNSS Marker to the tied monument (ITRS)
       dx (m)                 : 
       dy (m)                 : 
       dz (m)                 : 
     Accuracy (mm)            : (mm)
     Survey method            : (GPS CAMPAIGN/TRILATERATION/TRIANGULATION/etc)
     Date Measured            : (CCYY-MM-DDThh:mmZ)
     Additional Information   : (multiple lines)

6.   Frequency Standard


6.1  Standard Type            : EXTERNAL
       Input Frequency        : 10 MHZ
       Effective Dates        : 2000-07-17T10:30Z/CCYY-MM-DD
       Notes                  : (multiple lines)

6.x  Standard Type            : (INTERNAL or EXTERNAL H-MASER/CESIUM/etc)
       Input Frequency        : (if external)
       Effective Dates        : (CCYY-MM-DD/CCYY-MM-DD)
       Notes                  : (multiple lines)

7.   Collocation Information


7.1  Instrumentation Type     : DORIS
       Status                 : PERMANENT
       Effective Dates        : 1998-01-10/CCYY-MM-DD
       Notes                  : 

7.x  Instrumentation Type     : (GPS/GLONASS/DORIS/PRARE/SLR/VLBI/TIME/etc)
       Status                 : (PERMANENT/MOBILE)
       Effective Dates        : (CCYY-MM-DD/CCYY-MM-DD)
       Notes                  : (multiple lines)

8.   Meteorological Instrumentation


8.1.1  Humidity Sensor Model  : 
       Manufacturer           : 
       Serial Number          : 
       Data Sampling Interval : 
       Accuracy (% rel h)     : (% rel h)
       Aspiration             : (UNASPIRATED/NATURAL/FAN/etc)
       Height Diff to Ant     : (m)
       Calibration date       : (CCYY-MM-DD)
       Effective Dates        : CCYY-MM-DD/CCYY-MM-DD
       Notes                  : (multiple lines)

8.1.x  Humidity Sensor Model  : 
       Manufacturer           : 
       Serial Number          : 
       Data Sampling Interval : (sec)
       Accuracy (% rel h)     : (% rel h)
       Aspiration             : (UNASPIRATED/NATURAL/FAN/etc)
       Height Diff to Ant     : (m)
       Calibration date       : (CCYY-MM-DD)
       Effective Dates        : (CCYY-MM-DD/CCYY-MM-DD)
       Notes                  : (multiple lines)

8.2.1  Pressure Sensor Model  : 
       Manufacturer           : 
       Serial Number          : 
       Data Sampling Interval : 
       Accuracy               : (mbar)
       Height Diff to Ant     : (m)
       Calibration date       : (CCYY-MM-DD)
       Effective Dates        : CCYY-MM-DD/CCYY-MM-DD
       Notes                  : (multiple lines)

8.2.x  Pressure Sensor Model  : 
       Manufacturer           : 
       Serial Number          : 
       Data Sampling Interval : (sec)
       Accuracy               : (hPa)
       Height Diff to Ant     : (m)
       Calibration date       : (CCYY-MM-DD)
       Effective Dates        : (CCYY-MM-DD/CCYY-MM-DD)
       Notes                  : (multiple lines)

8.3.1  Temp. Sensor Model     : 
       Manufacturer           : 
       Serial Number          : 
       Data Sampling Interval : 
       Accuracy               : (deg C)
       Aspiration             : (UNASPIRATED/NATURAL/FAN/etc)
       Height Diff to Ant     : (m)
       Calibration date       : (CCYY-MM-DD)
       Effective Dates        : CCYY-MM-DD/CCYY-MM-DD
       Notes                  : (multiple lines)

8.3.x  Temp. Sensor Model     : 
       Manufacturer           : 
       Serial Number          : 
       Data Sampling Interval : (sec)
       Accuracy               : (hPa)
       Aspiration             : (UNASPIRATED/NATURAL/FAN/etc)
       Height Diff to Ant     : (m)
       Calibration date       : (CCYY-MM-DD)
       Effective Dates        : (CCYY-MM-DD/CCYY-MM-DD)
       Notes                  : (multiple lines)

8.4.1  Water Vapor Radiometer : 
       Manufacturer           : 
       Serial Number          : 
       Distance to Antenna    : (m)
       Height Diff to Ant     : (m)
       Calibration date       : (CCYY-MM-DD)
       Effective Dates        : CCYY-MM-DD/CCYY-MM-DD
       Notes                  : (multiple lines)

8.4.x  Water Vapor Radiometer : 
       Manufacturer           : 
       Serial Number          : 
       Distance to Antenna    : (m)
       Height Diff to Ant     : (m)
       Calibration date       : (CCYY-MM-DD)
       Effective Dates        : (CCYY-MM-DD/CCYY-MM-DD)
       Notes                  : (multiple lines)

8.5.1  Other Instrumentation  : (multiple lines)

8.5.x  Other Instrumentation  : 

9.  Local Ongoing Conditions Possibly Affecting Computed Position


9.1.x  Radio Interferences    : (TV/CELL PHONE ANTENNA/RADAR/etc)
       Observed Degredations  : (SN RATIO/DATA GAPS/etc)
       Effective Dates        : (CCYY-MM-DD/CCYY-MM-DD)
       Additional Information : (multiple lines)

9.2.x  Multipath Sources      : (METAL ROOF/DOME/VLBI ANTENNA/etc)
       Effective Dates        : (CCYY-MM-DD/CCYY-MM-DD)
       Additional Information : (multiple lines)

9.3.x  Signal Obstructions    : (TREES/BUILDLINGS/etc)
       Effective Dates        : (CCYY-MM-DD/CCYY-MM-DD)
       Additional Information : (multiple lines)

10.   Local Episodic Effects Possibly Affecting Data Quality


10.x Date                     : (CCYY-MM-DD/CCYY-MM-DD)
     Event                    : (TREE CLEARING/CONSTRUCTION/etc)

11.   On-Site, Point of Contact Agency Information

     Agency                   : Cenre National d'Etudes Spatiales
     Preferred Abbreviation   : CNES
     Mailing Address          : (multiple lines)
     Primary Contact
       Contact Name           : Roger Baldacchino
       Telephone (primary)    : (241) 761139
       Telephone (secondary)  : 
       Fax                    : (241) 773351
       E-mail                 : 
     Secondary Contact
       Contact Name           : 
       Telephone (primary)    : 
       Telephone (secondary)  : 
       Fax                    : 
       E-mail                 : 
     Additional Information   : (multiple lines)

12.  Responsible Agency (if different from 11.)

     Agency                   : Centre National d'Etudes Spatiales 
     Preferred Abbreviation   : CNES
     Mailing Address          : CNES DEE/EO/ST/SC - 18, avenue Edouard Belin
                              : 31401 Toulouse cedex 04 - France
     Primary Contact
       Contact Name           : Louis Duquesne
       Telephone (primary)    : (33) 5 61 28 19 62
       Telephone (secondary)  : 
       Fax                    : (33) 5 61 28 15 36
       E-mail                 : Louis.Duquesne@cnes.fr
     Secondary Contact
       Contact Name           : 
       Telephone (primary)    : 
       Telephone (secondary)  : 
       Fax                    : 
       E-mail                 : 
     Additional Information   : (multiple lines)

13.  More Information
    
     Primary Data Center      : IGN  
     Secondary Data Center    : CDDIS
     URL for More Information : 
       Hardcopy on File
       Site Map               : (Y or URL)
       Site Diagram           : X
       Horizon Mask           : X
       Monument Description   : (Y)
       Site Pictures          : (Y)
     Additional Information   : (multiple lines)
     Antenna Graphics with Dimensions