USN1 Site Information Form International GPS Service for Geodynamics 0. Form Prepared by (full name) : Ken Senior Date Prepared : 19-FEB-2002 Report Type : INITIAL Prepared Using : 1. Site Identification of the GPS Monument Site Name : U.S. Naval Observatory Time Service Four Character ID : USN1 Monument Inscription : no monument, GPS antenna ARP IERS DOMES Number : 40451S006 CDP Number : none Date Installed : 01-JAN-2002 Geologic Characteristic : on aluminum structure on roof of of 2-story building Bedrock Type : Bedrock Condition : Fracture Spacing : Notes : Additional Information : The antenna is mounted on a baseball-diamond-shaped : aluminum structure mounted on the roof (2 stories) : of the Time Service department building at the : U.S. Naval Observatory, Washington. D.C.. There are : nearby geodetic markers, but this antenna has not : been surveyed to those markers. (see accompanying : pictures). 2. Site Location Information City or Town : Washington State or Province : D.C. Country : U.S.A. Tectonic Plate : North American Approximate Position X coordinate (m) : 1112161.053 Y coordinate (m) : -4842855.273 Z coordinate (m) : 3985494.218 Latitude (deg) : 38.9205 N Longitude (deg) : 282.9337 E Elevation (m) : 57.405 Additional Information : 3. GPS Receiver Information 3.1 Receiver Type : ASHTECH Z-XII3T Serial Number : RT920012203 Firmware Version : IL01-1D04-MCF-12MX Date Installed : Date Removed : Additional Information : 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 : 3S-02-TSADM Serial Number : 12 Antenna Height (m) : 0.0 Antenna Reference Point : TOP Degree Offset from North : Antenna Radome Type : NONE Date Installed : 01-JAN-2002 Date Removed : Additional Information : Antenna is a 3S Navigtation TSA-100 : temperature-stabilized antenna. : Andrew FSJ1-50A (35422-33 phase stabilized) : 1/4 inch Superflexible Foam Dielectric : Heliax fed into a Femtosecond high-isolation : splitter followed by another short length : of Andrew FSJ1-50A cabling. : The final length of cabling is attached to : a DC block and 20db PAD at the receiver input : to improve impedance matching. The measured : delays through each component of the system : are summarized in the table below: : : L1(ns) L2(ns) : --------- --------- : antenna 31.68 25.37 : antenna cable 122.20 122.20 : antenna splitter : port #4 11.63 8.76 : cable to receiver 8.57 8.57 : DC block and 20db : PAD 0.50 0.50 : receiver w/ a : +1.6ns delay : between on-time : signal and : 20MHZ. 243.0 254.4 : : ionosphere-free net total system : delay: 414.15ns 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 : H-MASER Frequency : 5 MHz Effective Dates : 24-MAR-1998 Notes : Reference signal from USNO Master clock (MC2), : the primary realization of UTC(USNO), located : in Bldg. 78 in a thermal chamber. MC2 is : steered to UTC using information obtained : from the Bureau Bureau International des Poids : et Mesures (BIPM) roughly each month. See : the BIPM Circular T for more detail, : http://www.bipm.fr/enus/5_Scientific/c_time/time_ftp.shtml 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 8.1.1 Humidity Sensor Model : HUMICA H-sensor (pn 16663) Manufacturer : Vaisala Data Frequency : 15 seconds Accuracy (% rel h) : +/-1%(0...90%RH) : +/-2%(90...100%RH) Effective Dates : 21-AUG-2001 - dd-MMM-yyyy Notes : NOAA GSOS # 062 8.2.1 Pressure Sensor Model : PTB220 Manufacturer : Vaisala Data Frequency : 15 seconds Accuracy (mbar) : +/-0.1 mbar Height Diff to GPS (m) : -0.724 m Effective Dates : 21-AUG-2001 - dd-MMM-yyyy Notes : met sensors are located at USNO on rooftop : of Building 52A (~ few hundred m from GPS ant.) : NOAA GSOS # 062 8.3.3 Temperature Sensor Model: PT100 RTD 1/s DIN 43760B Manufacturer : Vaisala Data Frequency : 15 seconds Accuracy (deg C) : +/-0.1 @ 20.0C Effective Dates : 21-AUG-2001 - dd-MMM-yyyy Notes : NOAA GSOS # 062 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) 9. On-Site, Point of Contact Agency Information Agency : U.S. Naval Observatory Mailing Address : TS Dept. : 3450 Massachusetts Ave., NW : Wasington, D.C. 20392-5420 Primary Contact Contact Name : Ken Senior Telephone (primary) : 202-762-1456 Telephone (secondary) : Fax : 202-762-1511 E-mail : ksenior@usno.navy.mil Secondary Contact Contact Name : Ed Powers (USNO) Telephone (primary) : 202-762-1451 Telephone (secondary) : Fax : 202-762-1511 E-mail : powers.edward@usno.navy.mil Additional Information : Regional Data Center is JPL Regional Data Center Contact Contact Name : Dave Stowers (JPL) Telephone (primary) : 818-354-7055 Telephone (secondary) : Fax : 818-393-4965 E-mail : dstowers@jpl.nasa.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 3S-02-TSADM ----- / + \ <-- 0.2916 L2 | + | <-- 0.2725 L1 +--------------------------------------------------+ | | | | | | | | +-+--------------------------------------------------+-+ <-- 0.208 TGP +-------------------+-------------+--------------------+ +----------------------| |------------------------------ | =| | ------ | +------x------+ ------ | ------ | <-- 0.381 --> ------ | ------ | ------ | ------ | ------ | ------ | ------ | ------ | ------ | ------ | ------ | ------ +------------------------------------------------------------------- | | --------------x-------------- <-- ARP=TOP 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 All dimensions are in meters.