TORP Site Information Form
     International GPS Service for Geodynamics


0.   Form

     Prepared by (full name)  : Ken Hudnut, John Galtezka
     Date Prepared            : 11-NOV-1997
     Report Type              : UPDATE

Prepared Using

1.   Site Identification of the GPS Monument

     Site Name                : Torrance Airport, CA DGGA station
     Four Character ID        : TORP
     Monument Inscription     : N/A
     IERS DOMES Number        : 49912M001
     CDP Number               : None
     Date Installed           : 03-MAR-1997 hh:mm UT
     Geologic Characteristic  : Consolodated marine sediments
       Bedrock Type           : None
       Bedrock Condition      : NA
       Fracture Spacing       : NA
       Notes                  : (multiple lines)
     Additional Information   : Antenna is attached to a machined adjustable
                              : adaptor on top of a Scripps designed and
                              : installed drilled quadpod monument located at
                              : the southeast end of the main runway. Antenna
                              : cover is an Ashtech-manufactured radome that is
                              : attached by velcro onto the antenna itself (it
                              : is shaped like a missile cone, rather than
                              : hemispherical).
                              : SCIGN - Southern California Integrated GPS
                              : Network


2.   Site Location Information

     City or Town             : Torrance, Los Angeles County
     State or Province        : California
     Country                  : USA
     Tectonic Plate           : Pacific-North American plate boundary
     Approximate Position
       X coordinate (m)       : -2517894.2431
       Y coordinate (m)       : -4670260.2923
       Z coordinate (m)       :  3527827.5211
       Latitude (deg)         :  33.7978 N
       Longitude (deg)        : 118.3306 W
       Elevation (m)          :  -4.0939
     Additional Information   : ITRF92 coordinates. Epoch 1997.17


3.   GPS Receiver Information

3.1  Receiver Type            : ROGUE SNR-8000
     Serial Number            : T 03601 (JPL)
     Firmware Version         : 3.2
     Date Installed           : 03-MAR-1997 hh:mm UT
     Date Removed             : (dd-MMM-yyyy hh:mm UT)
     Additional Information   : First measurements

3.x  Receiver Type            :
     Serial Number            :
     Firmware Version         :
     Date Installed           : (dd-MMM-yyyy hh:mm UT)
     Date Removed             : (dd-MMM-yyyy hh:mm UT)
     Additional Information   : (multiple lines)


4.   GPS Antenna Information

4.1  Antenna Type             : DORNE MARGOLIN T
     Serial Number            : 296
     Antenna Height (m)       : 0.1145
     Antenna Reference Point  : ARP vertical height from drilled hole on
                              : southeast side of pipe to base of antenna
                              : pre-amp.
     Degree Offset from North :
     Antenna Radome Type      :
     Date Installed           : 03-MAR-1997 hh:mm UT
     Date Removed             : (dd-MMM-yyyy hh:mm UT)
     Additional Information   : Vertical datum is a drilled hole in the vertical
                              : pipe and faces southeast.

4.x  Antenna Type             :
     Serial Number            :
     Antenna Height (m)       : (m)
     Antenna Reference Point  : (ARP/BCR/BPA)
     Degree Offset from North :
     Antenna Radome Type      :
     Date Installed           : (dd-MMM-yyyy hh:mm UT)
     Date Removed             : (dd-MMM-yyyy hh:mm UT)
     Additional Information   : (multiple lines)


5.   Local Site Ties

5.x  Monument Name            :
     Site Ref CDP Number      : (XXXX)
     Site Ref Domes Number    : (XXXXXXXXX)
     Differential Components from GPS Mark to Site Reference (ITRS)
       dx (m)                 : (m)
       dy (m)                 : (m)
       dz (m)                 : (m)
     Accuracy (mm)            : (mm)
     Date Measured            : (dd-MMM-yyyy hh:mm UT)
     Additional Information   : (multiple lines)


6.   Frequency Standard

6.1  Standard Type            : INTERNAL
       Frequency              :
       Effective Dates        : dd-MMM-yyyy - dd-MMM-yyyy
       Notes                  : (multiple lines)

6.x  Standard Type            : (H-MASER/CESIUM/QUARTZ/INTERNAL/RUBIDIUM)
       Frequency              :
       Effective Dates        : (dd-MMM-yyyy - dd-MMM-yyyy)
       Notes                  : (multiple lines)


7.   Collocation Information

7.x  Instrumentation Type     : (DORIS/GLONASS/PRARE/SLR/VLBI)
       Status                 : (PERMANENT/MOBILE)
       Effective Dates        : (dd-MMM-yyyy - dd-MMM-yyyy)
       Notes                  : (multiple lines)


8.   Meteorological Instrumentation

8.1  Humidity Sensor Model    :
       Manufacturer           :
       Data Frequency         :
       Accuracy (% rel h)     : (% rel h)
       Effective Dates        : (dd-MMM-yyyy - dd-MMM-yyyy)
       Notes                  : (multiple lines)

8.2  Pressure Sensor Model    :
       Manufacturer           :
       Data Frequency         :
       Accuracy (mbar)        : (mbar)
       Height Diff to GPS (m) : (m)
       Effective Dates        : (dd-MMM-yyyy - dd-MMM-yyyy)
       Notes                  : (multiple lines)

8.3  Temperature Sensor Model :
       Manufacturer           :
       Data Frequency         :
       Accuracy (deg C)       : (deg C)
       Effective Dates        : (dd-MMM-yyyy - dd-MMM-yyyy)
       Notes                  : (multiple lines)

8.4  Water Vapor Radiometer   :
       Manufacturer           :
       Distance to GPS (m)    : (m)
       Elev Diff to GPS (m)   : (m)
       Effective Dates        : (dd-MMM-yyyy - dd-MMM-yyyy)
       Notes                  : (multiple lines)

8.5  Other Instrumentation    : (multiple lines)


9.   On-Site, Point of Contact Agency Information

     Agency                   : U.S. Geological Survey
     Mailing Address          : 525 South Wilson Ave.
                              : Pasadena, CA 91106
     Primary Contact
       Contact Name           : John E. Galetzka
       Telephone (primary)    : 818-583-7230
       Telephone (secondary)  :
       Fax                    : 818-583-7827
       E-mail                 : galetzka@gps.caltech.edu

     Secondary Contact
       Contact Name           :
       Telephone (primary)    :
       Telephone (secondary)  :
       Fax                    :
       E-mail                 :
     Additional Information   : (multiple lines)


10.  Responsible Agency (if different from 9.)

     Agency                   : (multiple lines)
     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)


11.  More Information

     URL for More Information :
     Hardcopy on File
       Site Map               : (Y)
       Site Diagram           : (Y)
       Horizon Mask           : (Y)
       Monument Description   : (Y)
       Site Pictures          : (Y)
     Additional Information   : (multiple lines)
     Antenna Graphics with Dimensions


             ASHTECH: Metal Choke Ring Type
             NOTE: Dimensions and Offsets Presumed to be same as
                   for TURBOROGUE DM-T (tests pending)

                         -----
                     /     +     \                        <-- 0.128  L2
                    |      +      |                       <-- 0.110  L1
  +--------------------------------------------------+    <-- 0.102  TCR
  |                                                  |
  |                                                  |
  |                                                  |
  |                                                  |
+-+--------------------------------------------------+-+  <-- 0.038
+-------------------+-------------+--------------------+  <-- 0.035  BCR
                    |             |
                   =|             |
                    +------x------+                       <-- 0.000 m ARP
                                                             -0.1145 m ARP to
                                                                vert datum mark
<--                      0.381                       -->


   ARP: Antenna Reference Point
   L1 : L1 Phase Center                   L2 : L2 Phase Center
   TCR: Top of Choke ring                 BCR: Bottom of Choke ring