[IGSMAIL-1598] USNO Site
Dennis
Dennis
Tue May 13 08:35:36 PDT 1997
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IGS Electronic Mail Tue May 13 8:35:36 PDT 1997 Message Number 1598
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Author: Dennis McCarthy
Subject: USNO Site
A new permanent GPS tracking site has been installed at the U.S. Naval
Observatory. The new station is named `USNO' and it is mounted on the
rooftop of Building 52 at the Observatory, located near downtown
Washington, DC. The geodetic reference point is the ARP rather than
a conventional monument.
This receiver uses a reference 5 MHz signal from the steered H-maser
which serves as the realization of the UTC(USNO) timescale. We intend
to calibrate the clock offset from the H-maser to the GPS antenna in
order to provide a direct link between UTC(USNO) and the time standards
at the tracking stations of the IGS global network as well as the GPS
satellites themselves.
The NOAA GODC group has kindly assisted with the installation of this
GPS receiver and will serve as the Regional Data Center for data
distribution.
USNO data are available at CDDIS starting 01 May 1997. A copy of the Site
Information Form is attached below.
Dennis McCarthy
Director of Time, U.S. Naval Observatory
-----------------------------------------------------------------------------
USNO Site Information Form
International GPS Service for Geodynamics
0. Form
Prepared by (full name) : Linda Nussear (NOAA), Jim Ray (USNO)
Date Prepared : 12-MAY-1997
Report Type : NEW
Prepared Using :
1. Site Identification of the GPS Monument
Site Name : U.S. Naval Observatory
Four Character ID : USNO
Monument Inscription : no monument, ARP
IERS DOMES Number : 40451S003
CDP Number : none
Date Installed : 24-APR-1997
Geologic Characteristic : on edge of roof of 3-story building
Bedrock Type :
Bedrock Condition :
Fracture Spacing :
Notes :
Additional Information : The antenna is mounted near the edge of the
roof (flat) of Building 52 (3 stories) at
the U.S. Naval Observatory inside Washington,
DC. There are no nearby geodetic markers or
control points.
2. Site Location Information
City or Town : Washington
State or Province : District of Columbia (DC)
Country : U.S.A.
Tectonic Plate : North American
Approximate Position
X coordinate (m) : 1112189.117
Y coordinate (m) : -4842954.301
Z coordinate (m) : 3985351.389
Latitude (deg) : 38.9190 N
Longitude (deg) : 282.9338 E
Elevation (m) : 47.654
Additional Information : (multiple lines)
3. GPS Receiver Information
3.1 Receiver Type : TurboRogue SNR12
Serial Number : T246
Firmware Version : 3.32.1.4
Date Installed : 24-APR-1997
Date Removed : (dd-MMM-yyyy hh:mm UT)
Additional Information : (multiple lines)
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 : 309
Antenna Height (m) : (m)
Antenna Reference Point : ARP
Degree Offset from North : oriented North but not measured
Antenna Radome Type : none
Date Installed : 24-APR-1997
Date Removed : (dd-MMM-yyyy hh:mm UT)
Additional Information : (multiple lines)
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
5.1 Monument Name : none
Site Ref CDP Number : none
Site Ref Domes Number : none
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)
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 : steered H-MASER
Frequency : 5 MHz
Effective Dates : 24-APR-1997
Notes : reference signal from USNO Master Clock,
the realization of UTC(USNO); calibration
of clock offset to be established later
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
7.1 Instrumentation Type : none
Status :
Effective Dates :
Notes :
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 : Lithium chloride dew point units
Manufacturer : Honeywell probes/General Eastern units
Data Frequency : 10 sec
Accuracy (% rel h) : dew point to 5 deg F
Effective Dates : (dd-MMM-yyyy - dd-MMM-yyyy)
Notes : probes are treated with lithium chloride
activated solution and dried
8.2 Pressure Sensor Model : Digital barometer (model 361)
Manufacturer : Setra
Data Frequency : 10 sec
Accuracy (mbar) : 0.1 mm mercury
Height Diff to GPS (m) : unknown
Effective Dates : (dd-MMM-yyyy - dd-MMM-yyyy)
Notes : all met sensors are located at USNO in
Building 7 (the Transit House for 6-inch
transit circle); air temp, air pressure, and
dew point read every 10 seconds; contact for
met data is Theodore J. Rafferty, Astrometry
Dept., USNO (TJR at sicon.usno.navy.mil)
8.3 Temperature Sensor Model : Platium Res Probes (model CT-807-A)
Manufacturer : Hy-cal
Data Frequency : 10 sec
Accuracy (deg C) : (deg C)
Effective Dates : (dd-MMM-yyyy - dd-MMM-yyyy)
Notes : (multiple lines)
8.4 Water Vapor Radiometer : none
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 : The USNO Master Clock is located in the
same building as this GPS receiver. The
differential time offset between the Master
Clock and the GPS antenna will be monitored
and used to calibrate the receiver clock time
directly to UTC(USNO).
9. On-Site, Point of Contact Agency Information
Agency : U.S. Naval Observatory
Mailing Address : TS Dept.
: 3450 Massachusetts Ave., NW
: Washington, DC 20392-5420
Primary Contact
Contact Name : Paul Wheeler (USNO)
Telephone (primary) : 202-762-1581
Telephone (secondary) :
Fax :
E-mail : paul at tsee2.usno.navy.mil
Secondary Contact
Contact Name : Jim Ray (USNO)
Telephone (primary) : 202-762-1444
Telephone (secondary) :
Fax : 202-762-1563
E-mail : jimr at maia.usno.navy.mil
Additional Information : Regional Data Center is NOAA GODC
Regional Data Center Contact
Contact Name : Linda Nussear (NOAA)
Telephone (primary) : 301-713-2852
Telephone (secondary) :
Fax : 301-713-4475
E-mail : linda at gracie.grdl.noaa.gov
10. Responsible Agency (if different from 9.)
Agency : (same as above in 9.)
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 : N
Site Diagram : N
Horizon Mask : N
Monument Description : no monument
Site Pictures : N
Additional Information : (multiple lines)
Antenna Graphics with Dimensions
TurboRogue: DORNE MARGOLIN T
-----
/ + \ <-- 0.128 L2
| + | <-- 0.110 L1
+--------------------------------------------------+ <-- 0.102 TCR
| |
| |
| |
| |
+-+--------------------------------------------------+-+ <-- 0.038
+-------------------+-------------+--------------------+ <-- 0.035 BCR
| |
=| |
+------x------+ <-- 0.000 ARP
<-- 0.381 -->
ARP: Antenna Reference Point
L1 : L1 Phase Center L2 : L2 Phase Center
TCR: Top of Chokering BCR: Bottom of Chokering
TGP: Top of Ground Plane BGP: Bottom of Ground Plane
TPA: Top of Preamplifier BPA: Bottom of Preamplifier
TOP: Top of Pole
--
Dennis D. McCarthy dmc at maia.usno.navy.mil
Director, Directorate of Time phone: (202) 762-1837
U.S. Naval Observatory fax: (202) 762-1563
Washington, DC 20392-5420
[Mailed From: Dennis McCarthy <dmc at Maia.usno.navy.mil>]
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