International GPS Service USN1 Site Information Form See Instructions at: ftp://igscb.jpl.nasa.gov/pub/station/general/sitelog_instr.txt 0. Form Prepared by (full name) : Edward Powers Date Prepared : 2002-07-05 Report Type : UPDATE If Update: Previous Site Log : usn1_20010325.log Modified/Added Sections : 0,4.1,6.1,11 1. Site Identification of the GNSS 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 Monument Description : (PILLAR/BRASS PLATE/STEEL MAST/etc) Height of the Monument : (m) Monument Foundation : (STEEL RODS, CONCRETE BLOCK, ROOF, etc) Foundation Depth : (m) Marker Description : (CHISELLED CROSS/DIVOT/BRASS NAIL/etc) Date Installed : 2002-01-01 Geologic Characteristic : on aluminum structure on roof of of 2-story : building Bedrock Type : (IGNEOUS/METAMORPHIC/SEDIMENTARY) Bedrock Condition : (FRESH/JOINTED/WEATHERED) Fracture Spacing : (1-10 cm/11-50 cm/51-200 cm/over 200 cm) Fault zones nearby : (YES/NO/Name of the zone) Distance/activity : (multiple lines) Additional Information : (multiple lines) : 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 (ITRF) X coordinate (m) : 1112161.053 Y coordinate (m) : -4842855.273 Z coordinate (m) : 3985494.218 Latitude (N is +) : +385513.80 Longitude (E is +) : -0770358.68 Elevation (m,ellips.) : 57.405 Additional Information : (multiple lines) 3. GNSS Receiver Information 3.1 Receiver Type : ASHTECH Z-XII3T Satellite System : GPS Serial Number : RT920012203 Firmware Version : IL01-1D04-MCF-12MX Elevation Cutoff Setting : (deg) Date Installed : 2002-01-01 Date Removed : (CCYY-MM-DDThh:mmZ) Temperature Stabiliz. : (none or tolerance in degrees C) Additional Information : 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 : 3S-02-TSADM Serial Number : 12 Antenna Reference Point : TOP Marker->ARP Up Ecc. (m) : 0.0 Marker->ARP North Ecc(m) : (F8.4) Marker->ARP East Ecc(m) : (F8.4) Alignment from True N : Antenna Radome Type : NONE Radome Serial Number : Antenna Cable Type : Andrew FSJ1-50A (35422-33 phase stabilized) Antenna Cable Length : (m) Date Installed : 2002-01-01 Date Removed : (CCYY-MM-DDThh:mmZ) Additional Information : Antenna is a 3S Navigtation TSA-100 : temperature-stabilized antenna. Cable is : 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 is 414.15ns : Note - These delays have already been added : to RAW pseudorange data and they should not : be added to any solutions. 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 5.1 Tied Marker Name : none Tied Marker Usage : (SLR/VLBI/LOCAL CONTROL/FOOTPRINT/etc) Tied Marker CDP Number : none Tied Marker DOMES Number : 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) 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 : H-MASER Input Frequency : 5 MHz Effective Dates : 1998-03-24/CCYY-MM-DD 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 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 : All calibration delays have already been : accounted for in the RAW pseudorange data : produced by USN1. 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 : none Status : Effective Dates : (CCYY-MM-DD/CCYY-MM-DD) 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 : HUMICA H-sensor (pn 16663) Manufacturer : Vaisala Serial Number : Data Sampling Interval : 15 seconds Accuracy (% rel h) : +/-1%(0...90%RH) Aspiration : (UNASPIRATED/NATURAL/FAN/etc) Height Diff to Ant : (m) Calibration date : (CCYY-MM-DD) Effective Dates : 2001-08-21/CCYY-MM-DD Notes : NOAA GSOS # 062 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 : PTB220 Manufacturer : Vaisala Serial Number : Data Sampling Interval : 15 seconds Accuracy : +/-0.1 mbar Height Diff to Ant : -0.724 m Calibration date : (CCYY-MM-DD) Effective Dates : 2001-08-21/CCYY-MM-DD Notes : met sensors are located at USNO on rooftop : of Building 52A (~ few hundred m from GPS ant.) : NOAA GSOS # 062 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) 8.3.3 Temp. Sensor Model : PT100 RTD 1/s DIN 43760B Manufacturer : Vaisala Serial Number : Data Sampling Interval : 15 seconds Accuracy : +/-0.1 @ 20.0C Aspiration : (UNASPIRATED/NATURAL/FAN/etc) Height Diff to Ant : (m) Calibration date : (CCYY-MM-DD) Effective Dates : 2001-08-21/CCYY-MM-DD Notes : NOAA GSOS # 062 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 : none 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.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 : U.S. Naval Observatory Preferred Abbreviation : USNO Mailing Address : TS Dept. : 3450 Massachusetts Ave., NW : Washington, D.C. 20392-5420 Primary Contact Contact Name : Ed Powers (USNO) Telephone (primary) : 202-762-1451 Telephone (secondary) : Fax : 202-762-1511 E-mail : powers.edward@usno.navy.mil Secondary Contact Contact Name : Lisa Nelson (USNO) Telephone (primary) : 202-762-0289 Telephone (secondary) : Fax : 202-762-1511 E-mail : lmm@usno.navy.mil Additional Information : Regional Data Center is JPL : : Dave Stowers (JPL) : 818-354-7055 : : 818-393-4965 : dstowers@jpl.nasa.gov 12. Responsible Agency (if different from 11.) Agency : (same as above in 9.) 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 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.