HELM Site Information Form (site log)
     International GPS Service
     See Instructions at:
       ftp://igscb.jpl.nasa.gov/pub/station/general/sitelog_instr.txt

0.   Form
     
     Prepared by (full name)  : Geodesy and Positioning
     Date Prepared            : 2008-12-18
     Report Type              : Update
     If Update:
      Previous Site Log       : helm_20080710.log
      Modified/Added Sections : 3.2, 4.1, 13


1.   Site Identification of the GNSS Monument

     Site Name                : Helmsdale
     Four Character ID        : HELM
     Monument Inscription     : 
     IERS DOMES Number        : 
     CDP Number               : 
     Monument Description     : 1m Stainless Steel pole
       Height of the Monument : Apprx 0.6m above top bracet
       Monument Foundation    : 2 storey stone building
       Foundation Depth       : Unknown
     Marker Description       : Centre of mount thread on plane of antenna ARP
     Date Installed           : 2007-06-22
     Geologic Characteristic  : Unknown
       Bedrock Type           : Unknown
       Bedrock Condition      : Unknown
       Fracture Spacing       : Unknown
       Fault zones nearby     : No
         Distance/activity    : 
     Additional Information   : Antenna is approx 10m above ground level


2.   Site Location Information

     City or Town             : Helmsdale
     State or Province        : Highland
     Country                  : United Kingdom
     Tectonic Plate           : Eurasian
     Approximate Position (ITRF)
       X coordinate (m)       : 3370353
       Y coordinate (m)       : -214960
       Z coordinate (m)       : 5392588
       Latitude (N is +)      : +580655.08
       Longitude (E is +)     : -0033857.69
       Elevation (m,ellips.)  : 00066.7
     Additional Information   : 


3.   GNSS Receiver Information

3.1  Receiver Type            : LEICA SR530
     Satellite System         : GPS
     Serial Number            : 0034807 
     Firmware Version         : 4.20
     Elevation Cutoff Setting : 5 
     Date Installed           : 2007-06-22T00:00Z 
     Date Removed             : 2008-07-10T10:55Z
     Temperature Stabiliz.    : none
     Additional Information   :  

3.2  Receiver Type            : LEICA SR530
     Satellite System         : GPS
     Serial Number            : 0039819 
     Firmware Version         : 4.20
     Elevation Cutoff Setting : 5 
     Date Installed           : 2008-07-10T11:00Z 
     Date Removed             : 2008-12-18T09:30Z 
     Temperature Stabiliz.    : none
     Additional Information   : Station destroyed 2008-12-18 


4.   GNSS Antenna Information

4.1  Antenna Type             : LEIAT504        LEIS
     Serial Number            : 
     Antenna Reference Point  : BPA
     Marker->ARP Up Ecc. (m)  : 000.0000
     Marker->ARP North Ecc(m) : 000.0000
     Marker->ARP East Ecc(m)  : 000.0000
     Alignment from True N    : 0
     Antenna Radome Type      : LEIS
     Radome Serial Number     : 
     Antenna Cable Type       : 
     Antenna Cable Length     : 
     Date Installed           : 2007-06-22T00:00Z
     Date Removed             : 2008-12-18T09:30Z
     Additional Information   : Station destroyed 2008-12-18


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            : INTERNAL
       Input Frequency        : 
       Effective Dates        : 2007-06-22/2008-12-18
       Notes                  : 

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     : 
       Status                 : 
       Effective Dates        : 
       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)     : 
       Aspiration             : 
       Height Diff to Ant     : 
       Calibration date       : 
       Effective Dates        : 
       Notes                  : 

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               : 
       Height Diff to Ant     : 
       Calibration date       : 
       Effective Dates        : 
       Notes                  : 

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               : 
       Aspiration             : 
       Height Diff to Ant     : 
       Calibration date       : 
       Effective Dates        : 
       Notes                  : 

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)

8.4.1 Water Vapor Radiometer  : 
       Manufacturer           : 
       Serial Number          : 
       Distance to Antenna    : 
       Height Diff to Ant     : 
       Calibration date       : 
       Effective Dates        : 
       Notes                  : 

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   : 

8.5.x Other Instrumentation   : (multiple lines)


9.  Local Ongoing Conditions Possibly Affecting Computed Position

9.1.1 Radio Interferences     : 
       Observed Degradations  : 
       Effective Dates        : 
       Additional Information : 

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       : 
       Effective Dates        : 
       Additional Information : 

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

9.3.1 Signal Obstructions     : 
       Effective Dates        : 
       Additional Information : 

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

10.1 Date                     : 
     Event                    : 

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

11.   On-Site, Point of Contact Agency Information

     Agency                   : Ordnance Survey
     Preferred Abbreviation   : 
     Mailing Address          : Ordnance Survey
                              : Adanac Drive
                              : Southampton
                              : SO16 0AS
     Primary Contact
       Contact Name           : Customer Service Centre
       Telephone (primary)    : 03456 050505
       Telephone (secondary)  :  
       Fax                    : 
       E-mail                 : customerservices@os.uk
     Secondary Contact
       Contact Name           : 
       Telephone (primary)    : 
       Telephone (secondary)  : 
       Fax                    : 
       E-mail                 : 
     Additional Information   : 


12.  Responsible Agency (if different from 11.)

     Agency                   : Ordnance Survey
     Preferred Abbreviation   : 
     Mailing Address          : Ordnance Survey
                              : Adanac Drive
                              : Southampton
                              : SO16 0AS
     Primary Contact
       Contact Name           : Customer Service Centre
       Telephone (primary)    : 03456 050505
       Telephone (secondary)  :  
       Fax                    : 
       E-mail                 : customerservices@os.uk
     Secondary Contact
       Contact Name           : 
       Telephone (primary)    : 
       Telephone (secondary)  : 
       Fax                    : 
       E-mail                 :
     Additional Information   : 


13.  More Information

     Primary Data Center      :
     Secondary Data Center    :
     URL for More Information : 
     Hardcopy on File
       Site Map               : 
       Site Diagram           : 
       Horizon Mask           : 
       Monument Description   : 
       Site Pictures          : 
     Additional Information   : 
     Antenna Graphics with Dimensions



LEIAT504
L1/L2 Dorne Margolin antenna with chokerings
(designed after DORNE MARGOLIN T) 

                       +-------+                          <-- 0.1393
                     /     +     \                        <-- 0.1282 L2
                    |      +      |                       <-- 0.1093 L1
  +-----------------+-------------+------------------+    <-- 0.1020 TCR
  |                                                  | 
  |                                                  |
  |                                                  |
  |                                                  |
+-+--------------------------------------------------+-+  <-- 0.0380
+-------------------+-------------+--------------------+  <-- 0.1020 BCR
                    |             |
                    |             |
                    +------x------+                       <-- 0.000  BPA=ARP

<--                      0.3794                      -->


   ARP: Antenna Reference Point
   L1 : L1 Phase Center                   L2 : L2 Phase Center
   TCR: Top of Chokering                  BCR: Bottom of Chokering
   BPA: Bottom of Preamplifier