NPLD00GBR Site Information Form (site log)
     International GNSS Service
     See Instructions at:
       https://files.igscb.org/pub/station/general/sitelog_instr.txt


0.   Form

     Prepared by (full name)  : 
     Date Prepared            : 2007-12-14
     Report Type              : UPDATE
     If Update:
      Previous Site Log       : npld00gbr_20061207.log
      Modified/Added Sections : 11, 13


1.   Site Identification of the GNSS Monument

     Site Name                : Teddington
     Four Character ID        : NPLD
     Monument Inscription     : NPLD
     IERS DOMES Number        : 13234M003
     CDP Number               : (A4)
     Monument Description     : STEEL BOLT
       Height of the Monument : (m)
       Monument Foundation    : ROOF
       Foundation Depth       : (m)
     Marker Description       : (CHISELLED CROSS/DIVOT/BRASS NAIL/etc)
     Date Installed           : 2000-08-15T12:00Z
     Geologic Characteristic  : (BEDROCK/CLAY/CONGLOMERATE/GRAVEL/SAND/etc)
       Bedrock Type           : (IGNEOUS/METAMORPHIC/SEDIMENTARY)
       Bedrock Condition      : (FRESH/JOINTED/WEATHERED)
       Fracture Spacing       : (0 cm/1-10 cm/11-50 cm/51-200 cm/over 200 cm)
       Fault zones nearby     : NO
         Distance/activity    : (multiple lines)
     Additional Information   : centre of top of bolt through steel railing,
                              : NE corner of liftshaft roof, Building 2.
                              : Note that the same receiver was previously
                              : used for different monuments as listed here -
                              : 20-AUG-1997-07-SEP-1998, used unlabelled
                              : monument
                              : 07-SEP-1998 - 15-AUG-2000, moved to monument
                              : NPLB 13234M002.
                              : 15-AUG-2000 - present, moved to monument
                              : NPLD 13234M003.


2.   Site Location Information

     City or Town             : Teddington
     State or Province        : Greater London
     Country                  : United Kingdom of Great Britain and Northern 
                              : Ireland (the)
     Tectonic Plate           : EURASIAN
     Approximate Position (ITRF)
       X coordinate (m)       : 3985500.414
       Y coordinate (m)       : -23625.493
       Z coordinate (m)       : 4962941.695
       Latitude (N is +)      : +512515.53
       Longitude (E is +)     : -0002022.69
       Elevation (m,ellips.)  : 72.7
     Additional Information   : This location estimate is from Gipsy on
                              : NPLD3400.00O.
                              : The antenna offset has been added.
                              : Previous NPLB 13234M002 monument position:
                              : 3985502.5969, -23625.5546, 4962941.9106


3.   GNSS Receiver Information

3.1  Receiver Type            : ASHTECH Z-XII3T
     Satellite System         : GPS
     Serial Number            : LP0Z962
     Firmware Version         : 1I08
     Elevation Cutoff Setting : 0 deg
     Date Installed           : 1997-08-20T12:00Z
     Date Removed             : 2003-07-03T12:00Z
     Temperature Stabiliz.    : (deg C) +/- 2.0
     Additional Information   : Prior to March 2004, receiver was listed as
                              : ASHTECH Z-XII3 in site logs, but receiver
                              : was an ASHTECH Z-XII3T

3.2  Receiver Type            : ASHTECH Z-XII3T
     Satellite System         : GPS
     Serial Number            : LP0Z962
     Firmware Version         : 1L01
     Elevation Cutoff Setting : 0 deg
     Date Installed           : 2003-07-03T12:00Z
     Date Removed             : 2007-12-15
     Temperature Stabiliz.    : (deg C) +/- 2.0
     Additional Information   : Prior to March 2004, receiver was listed as
                              : ASHTECH Z-XII3 in site logs, but receiver
                              : was an ASHTECH Z-XII3T

3.x  Receiver Type            : (A20, from rcvr_ant.tab; see instructions)
     Satellite System         : (GPS+GLO+GAL+BDS+QZSS+IRNSS+SBAS)
     Serial Number            : (A20, but note the first A5 is used in SINEX)
     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             : AOAD/M_T        NONE
     Serial Number            : 340
     Antenna Reference Point  : BPA
     Marker->ARP Up Ecc. (m)  :   0.0796
     Marker->ARP North Ecc(m) :   0.0000
     Marker->ARP East Ecc(m)  :   0.0000
     Alignment from True N    : 0 deg
     Antenna Radome Type      : NONE
     Radome Serial Number     : NONE
     Antenna Cable Type       : Andrews phase-stabilised FSJ1-50A
     Antenna Cable Length     : 30 m
     Date Installed           : 2000-08-15T12:00Z
     Date Removed             : 2007-12-15
     Additional Information   : Moved from monument NPLB to NPLD, for better
                              : mechanical stability.
                              : A levelling mount is used with a 79.63mm tall
                              : spike above the monument point.
                              : Antenna cable is 30m of phase-stabilised
                              : Andrews FSJ1-50A, delay =
                              : (122.15+-0.1)ns (measured, 15-AUG-2000)

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.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)                 : (m)
       dy (m)                 : (m)
       dz (m)                 : (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 H-MASER
       Input Frequency        : 5 MHz
       Effective Dates        : 1997-08-20/1998-07-13
       Notes                  : HM2, a Sigma Tau active H maser.
                              : It is the source of UTC(NPL)

6.2  Standard Type            : EXTERNAL H-MASER
       Input Frequency        : 5 MHz
       Effective Dates        : 1998-07-13/2006-10-26
       Notes                  : HM1, a Sigma Tau active H maser.
                              : It is the source of UTC(NPL).
                              : HM2 replaced by HM1 for UTC(NPL) following
                              : malfunction on 11-JUL-1998.
                              : 1PPS from port C2 of distr. amp. id 182,
                              : UTC(NPL)-NPLD_1PPS_in = +8433.7 ns
                              : (15-AUG-2000 to 15-JAN-2001).
                              : UTC(NPL)-NPLD_1PPS_in = +8426.4 ns
                              : (15-JAN-2001 onwards).
                              : 5MHz from port 6 of distr. amp. id 184,
                              : then quadrupler up to 20MHz.

6.3  Standard Type            : EXTERNAL H-MASER
       Input Frequency        : 10 MHz
       Effective Dates        : 2006-10-26/CCYY-MM-DD
       Notes                  : HM2, a Datum active H maser.
                              : It is the source of UTC(NPL).
                              : UTC(NPL)-NPLD_1PPS_in = +8382.3 ns
                              : 10MHz multiplied up to 20MHz for receiver

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     : GLONASS
       Status                 : PERMANENT
       Effective Dates        : 1998-10-21/2001-07-20
       Notes                  : NPLC/NPLE IGEX station, 3SNAV R100-40T with
                              : TSA-100 3S CR.

7.2  Instrumentation Type     : TWSTFT
       Status                 : PERMANENT
       Effective Dates        : 1997-08-20/CCYY-MM-DD
       Notes                  : Two-way satellite time and frequency
                              : earth station, NPL1.

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.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.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.x  Temp. Sensor Model     : 
       Manufacturer           : 
       Serial Number          : 
       Data Sampling Interval : (sec)
       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)

8.4.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.x  Other Instrumentation  : (multiple lines)


9.   Local Ongoing Conditions Possibly Affecting Computed Position

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

9.2.1  Multipath Sources      : METAL DOME
       Effective Dates        : 2000-08-15/CCYY-MM-DD
       Additional Information : Copper dome with 2m radius has centre ~10m
                              : West of NPLD.

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/BUILDINGS/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                   : National Physical Laboratory
     Preferred Abbreviation   : NPL
     Mailing Address          : Hampton Road
                              : TW11 0LW Teddington
                              : United Kingdom of Great Britain and Northern 
                              : Ireland (the)
     Primary Contact
       Contact Name           : 
       Telephone (primary)    : 
       Telephone (secondary)  : 
       Fax                    : 
       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                   : (multiple lines)
     Preferred Abbreviation   : (A10)
     Mailing Address          : (multiple lines)
     Primary Contact
       Contact Name           : 
       Telephone (primary)    : 
       Telephone (secondary)  : 
       Fax                    : 
       E-mail                 : 
     Secondary Contact
       Contact Name           : 
       Telephone (primary)    : 
       Telephone (secondary)  : 
       Fax                    : 
       E-mail                 : 
     Additional Information   : (multiple lines)


13.  More Information

     Primary Data Center      : BKG
     Secondary Data Center    : BEV
     URL for More Information : http://www.npl.co.uk/npl/ctm/gnss.html
     Hardcopy on File
       Site Map               : (Y or URL)
       Site Diagram           : (Y)
       Horizon Mask           : (Y)
       Monument Description   : (Y)
       Site Pictures          : (Y)
     Additional Information   : (multiple lines)
     Antenna Graphics with Dimensions

AOAD/M_T
Dorne Margolin with chokerings (TurboRogue)

                      +---------+
                     /     +     \                        <-- 0.1280 L2
                    |      +      |                       <-- 0.1100 L1
  +-----------------+-------------+------------------+    <-- 0.1020 TCR
  |                                                  |   
  |                                                  |
  |                                                  |
  |                                                  |
+-+--------------------------------------------------+-+  <-- 0.0380
+-------------------+-------------+--------------------+  <-- 0.0350 BCR
                    |             |
                    |             |
                    +------x------+                       <-- 0.0 BPA=ARP

<--                      0.3810                      -->


   ARP: Antenna Reference Point
   L1 : L1 Phase Center                   L2 : L2 Phase Center