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

0.   Form

     Prepared by (full name)  : Oivind Ruud
     Date Prepared            : 2004-05-18
     Report Type              : UPDATE
     If Update:
      Previous Site Log       : dgar_20021105.log
      Modified/Added Sections : 1, 2, 3.7, 4.4, 11, 13 

1.  Site Identification of the GNSS Monument

     Site Name                : Diego Garcia Island
     Four Character ID        : DGAR
     Monument Inscription     : None
     IERS DOMES Number        : 30802M001
     CDP Number               : None
     Monument Description     : STAINLESS STEEL BRACKET/MOUNT
       Height of the Monument : (m)
       Monument Foundation    : ROOF
       Foundation Depth       : (m)
     Marker Description       : REFERENCE MARK IN BRACKET
     Date Installed           : 1996-03-11
     Geologic Characteristic  : (BEDROCK/CLAY/CONGLOMERATE/GRAVEL/SAND/etc)
       Bedrock Type           : (IGNEOUS/METAMORPHIC/SEDIMENTARY)
       Bedrock Condition      : (FRESH/JOINTED/WEATHERED)
       Fracture Spacing       : (1-10 cm/10-50 cm/50-200 cm/over 200 cm)
       Fault zones nearby     : (YES/NO/Name of the zone)
         Distance/activity    : (multiple lines)
     Additional Information   : Leveling mount placed over reference
                              : mark in stainless steel bracket.

2.   Site Location Information

     City or Town             : Diego Garcia Island
     State or Province        : 
     Country                  : U.K. Territory
     Tectonic Plate           : 
     Approximate Position (ITRF)
       X coordinate (m)       : 1916269.5191
       Y coordinate (m)       : 6029977.6090
       Z coordinate (m)       : -801719.9793
       Latitude (N is +)      : -071610.8688
       Longitude (E is +)     : +0722212.8584
       Elevation (m,ellips.)  : -64.7482
     Additional Information   : US-UK Military facility

3.  GNSS Receiver Information


3.1  Receiver Type            : ROGUE SNR-8000
     Satellite System         : GPS
     Serial Number            : T335
     Firmware Version         : 3.2 link 3/9/95
     Elevation Cutoff Setting : 4
     Date Installed           : 1996-03-11T00:00Z
     Date Removed             : 1996-10-02T00:00Z
     Temperature Stabiliz.    : none
     Additional Information   : (multiple lines)

3.2  Receiver Type            : ROGUE SNR-8000
     Satellite System         : GPS
     Serial Number            : T-362
     Firmware Version         : 3.2 link 3/9/95
     Elevation Cutoff Setting : 4
     Date Installed           : 1996-10-02T00:00Z
     Date Removed             : 1999-07-12T00:00Z
     Temperature Stabiliz.    : none
     Additional Information   : (multiple lines)

3.3  Receiver Type            : ROGUE SNR-8000
     Satellite System         : GPS
     Serial Number            : T-362
     Firmware Version         : 3.2.32.8
     Elevation Cutoff Setting : 4
     Date Installed           : 1999-07-12T00:00Z
     Date Removed             : 1999-11-02T00:00Z
     Temperature Stabiliz.    : none
     Additional Information   : (multiple lines)

3.4  Receiver Type            : AOA SNR-8000 ACT
     Satellite System         : GPS
     Serial Number            : T341U
     Firmware Version         : 3.3.32.3
     Elevation Cutoff Setting : 4
     Date Installed           : 1999-11-02T00:00Z
     Date Removed             : 2002-01-19T00:00Z
     Temperature Stabiliz.    : none
     Additional Information   : removal date approximate

3.5  Receiver Type            : AOA SNR-8000 ACT
     Satellite System         : GPS
     Serial Number            : 2008
     Firmware Version         : 3.3.32.3
     Elevation Cutoff Setting : 4
     Date Installed           : 2002-01-19T00:00Z
     Date Removed             : 2002-11-02T00:00Z
     Temperature Stabiliz.    : none
     Additional Information   : install date approximate

3.6  Receiver Type            : AOA SNR-8000 ACT
     Satellite System         : GPS
     Serial Number            : 2008
     Firmware Version         : 3.3.32.5
     Elevation Cutoff Setting : 4
     Date Installed           : 2002-11-02T02:16Z
     Date Removed             : 2004-05-18T00:00Z
     Temperature Stabiliz.    : none
     Additional Information   : firmware update, also replaced data
                              : flashcard.

3.7  Receiver Type            : ASHTECH UZ-12
     Satellite System         : GPS
     Serial Number            : UC120031617
     Firmware Version         : CN04
     Elevation Cutoff Setting : 0
     Date Installed           : 2004-05-18T00:00Z
     Date Removed             : (CCYY-MM-DDThh:mmZ)
     Temperature Stabiliz.    : none
     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             : AOAD/M_T        NONE
     Serial Number            : 480
     Antenna Reference Point  : BPA
     Marker->ARP Up Ecc. (m)  : 0.0814
     Marker->ARP North Ecc(m) : 0.0000
     Marker->ARP East Ecc(m)  : 0.0000
     Alignment from True N    : 0
     Antenna Radome Type      : NONE
     Radome Serial Number     : 
     Antenna Cable Type       : (vendor & type number)
     Antenna Cable Length     : (m)
     Date Installed           : 1996-03-11T00:00Z
     Date Removed             : 1996-07-15T00:00Z
     Additional Information   : (multiple lines)

4.2  Antenna Type             : AOAD/M_T        NONE
     Serial Number            : 426
     Antenna Reference Point  : BPA
     Marker->ARP Up Ecc. (m)  : 0.0814
     Marker->ARP North Ecc(m) : 0.0000
     Marker->ARP East Ecc(m)  : 0.0000
     Alignment from True N    : 0
     Antenna Radome Type      : NONE
     Radome Serial Number     : 
     Antenna Cable Type       : (vendor & type number)
     Antenna Cable Length     : (m)
     Date Installed           : 1996-07-15T00:00Z
     Date Removed             : 1996-09-23T00:00Z
     Additional Information   : (multiple lines)

4.3  Antenna Type             : AOAD/M_T        NONE
     Serial Number            : 250
     Antenna Reference Point  : BPA
     Marker->ARP Up Ecc. (m)  : 0.0814
     Marker->ARP North Ecc(m) : 0.0000
     Marker->ARP East Ecc(m)  : 0.0000
     Alignment from True N    : 0
     Antenna Radome Type      : NONE
     Radome Serial Number     : 
     Antenna Cable Type       : (vendor & type number)
     Antenna Cable Length     : (m)
     Date Installed           : 1996-09-23T00:00Z
     Date Removed             : 2004-05-18T00:00Z
     Additional Information   : (multiple lines)

4.4  Antenna Type             : ASH701945E_M    NONE
     Serial Number            : CR620024214
     Antenna Reference Point  : BPA
     Marker->ARP Up Ecc. (m)  : 0.0814
     Marker->ARP North Ecc(m) : 0.0000
     Marker->ARP East Ecc(m)  : 0.0000
     Alignment from True N    : 0
     Antenna Radome Type      : NONE
     Radome Serial Number     :
     Antenna Cable Type       : (vendor & type number)
     Antenna Cable Length     : (m)
     Date Installed           : 2004-05-18T00:00Z
     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.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            : INTERNAL
       Input Frequency        : 
       Effective Dates        : 1996-04-20/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.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                   : Jet Propulsion Laboratory
     Preferred Abbreviation   : JPL
     Mailing Address          : 4800 Oak Grove Drive
                              : Pasadena, CA 91109 USA
     Primary Contact
       Contact Name           : David A. Stowers
       Telephone (primary)    : 818-354-7055
       Telephone (secondary)  : 
       Fax                    : 818-393-4965
       E-mail                 : dstowers@jpl.nasa.gov
     Secondary Contact
       Contact Name           : Network Engineer/UNAVCO
       Telephone (primary)    : 303-381-7476 
       Telephone (secondary)  : 303-381-7500
       Fax                    : 303-381-7451
       E-mail                 : ruud@unavco.org
     Additional Information   : Oivind Ruud (303-381-7476)

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      : JPL (ODC-Operational Data Center)
     Secondary Data Center    : CDDIS (GDC-Global Data Center)
     URL for More Information : www.unavco.net/public/logs/sitedetails.aspx
       Hardcopy on File
       Site Map               : Y
       Site Diagram           : Y
       Horizon Mask           : N
       Monument Description   : Y
       Site Pictures          : Y
     Additional Information   : (multiple lines)
     Antenna Graphics with Dimensions

ASH701945E_M

                         +-------+
                       /     +     \                        <--  0.1280 L2
                      |      +      |                       <--  0.1100 L1
    +-----------------+-------------+------------------+    <--  0.1006 TCR
    |                                                  |
    |                                                  |
    |                                                  |
    |                                                  |
  +-+--------------------------------------------------+-+  <--  0.0376
  +-------------------+-------------+--------------------+  <--  0.0346 BCR
                      |             |
                      |             |
                      +------x------+                    <-- 0.0000 BPA=ARP

  <--                      0.3794                      -->