NRL1 Site Information Form (site log) International GPS Service See Instructions at: ftp://igscb.jpl.nasa.gov/pub/station/general/sitelog_instr.txt 0. Form Prepared by (full name) : Ken Senior Date Prepared : 2007-11-21 Report Type : UPDATE If Update: Previous Site Log : nrl1_20050705 Modified/Added Sections : 6.2, 4.1, 11, 13 1. Site Identification of the GNSS Monument Site Name : U.S. Naval Research Laboratory Four Character ID : NRL1 Monument Inscription : no monument, ARP IERS DOMES Number : 40451S301 CDP Number : NONE Monument Description : STEEL PLATE Height of the Monument : 0.005 m Monument Foundation : ROOF Foundation Depth : (m) Marker Description : (CHISELLED CROSS/DIVOT/BRASS NAIL/etc) Date Installed : 2005-01-01 Geologic Characteristic : Bedrock Type : Bedrock Condition : Fracture Spacing : Fault zones nearby : NO Distance/activity : Additional Information : The antenna is mounted near the center of and : a few inches above a penthouse which rests atop : 3-story building. 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 : United States Tectonic Plate : North American Approximate Position (ITRF) X coordinate (m) : 1117249.15762 Y coordinate (m) : -4848758.67469 Z coordinate (m) : 3976821.16656 Latitude (N is +) : +384914.71 Longitude (E is +) : -0770127.85 Elevation (m,ellips.) : -26.010 Additional Information : (multiple lines) 3. GNSS Receiver Information 3.1 Receiver Type : ASHTECH Z-XII3T Satellite System : GPS Serial Number : RT920010202 Firmware Version : IL01-1D04-MCF-12MX Elevation Cutoff Setting : (deg) Date Installed : 2005-01-01 Date Removed : CCYY-MM-DDThh:mmZ Temperature Stabiliz. : 2 Additional Information : Resides in thermally-controlled chamber. : Absolute receiver delay was determined : during two absolute calibrations of the : receiver. : RECEIVER DELAYS : cal #1 cal #2 avg : P1 294.8 ns 294.8 ns 294.8 ns : P2 306.8 ns 308.0 ns 307.4 ns : P3 276.3 ns 274.4 ns 275.4 ns : : TtP = +23.6 ns (tick-to-phase delay at : receiver input) : : NOTE: One must also subtract from the above : receiver delays the value of the : tick-to-phase. The TtP is the time : difference between the rising tick of : the 1PPS input and the next (rising) : zero crossing of the 20 MHz. : : See section 13 for full system timing : calibration calculation. 3.x Receiver Type : (A20, from rcvr_ant.tab; see instructions) Satellite System : (GPS+GLO+GAL+BDS+QZSS+SBAS) 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 : ASH701945C_M Serial Number : CR620011801 Antenna Reference Point : BPA Marker->ARP Up Ecc. (m) : 000.0000 Marker->ARP North Ecc(m) : 000.0000 Marker->ARP East Ecc(m) : 000.0000 Alignment from True N : 0 Antenna Radome Type : NONE Radome Serial Number : Antenna Cable Type : Andrew FSJ1-50A Antenna Cable Length : 26.5176 m Date Installed : 2005-01-01 Date Removed : CCYY-MM-DDThh:mmZ Additional Information : Absolute antenna calibration info: : absolute antenna delays: : L1=25.251 ns : L2=26.266 ns : L3=23.682 ns : : antenna cable delay = 109.455 ns : : See section 13 for full system timing : calibration calculation. : : More information on antenna cable: : Andrew FSJ1-50A (35422-33 phase stabilized) : 1/4 inch Superflexible Foam Dielectric : Heliax -- physical length 87 feet : (26.5176 m), mostly outside; measured electrical : length is 109.455 ns +/- 30 ps : specifications - : Velocity factor 0.84 : DC resistance 2 to 3 ohms per 1000 foot : Capacitance, 24.2 pF/foot : Inductance, .061 uH/foot : Loss at 1250 MHz 6.77 dB/100 foot : Loss at 1500 MHz 7.47 dB/100 foot : Electrical Length Change verses Temperature - : 400 PPM over (-40 to 30 C) or 5.7 PPM/C : => 0.02 ps/m/C 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) : (m) dy (m) : (m) dz (m) : (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 : 20 Mhz Effective Dates : 2005-01-01 Notes : 5 Mhz is multiplied to 20 Mhz using a multiplier : built in-house. 6.2 Standard Type : H-MASER Input Frequency : 20 Mhz Effective Dates : 2007-08-01 Notes : 5 Mhz is multiplied to 20 Mhz using a multiplier : built in-house. Input to NRL1 is now the : steered : (Auxiliary Output Generator) output of a H-MASER : and also represents the NRL realization of UTC, : UTC(NRL). 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 : (GPS/GLONASS/DORIS/PRARE/SLR/VLBI/TIME/etc) Status : (PERMANENT/MOBILE) Effective Dates : (CCYY-MM-DD/CCYY-MM-DD) Notes : (multiple lines) 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 : (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) 8.1.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 : (sec) Accuracy : (hPa) Height Diff to Ant : (m) Calibration date : (CCYY-MM-DD) Effective Dates : (CCYY-MM-DD/CCYY-MM-DD) Notes : (multiple lines) 8.2.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 : (sec) 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 : (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) 8.4.1 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 : (multiple lines) 9. Local Ongoing Conditions Possibly Affecting Computed Position 9.1.1 Radio Interferences : (TV/CELL PHONE ANTENNA/RADAR/etc) Observed Degradations : (SN RATIO/DATA GAPS/etc) Effective Dates : (CCYY-MM-DD/CCYY-MM-DD) Additional Information : (multiple lines) 9.1.x Radio Interferences : (TV/CELL PHONE ANTENNA/RADAR/etc) Observed Degradations : (SN RATIO/DATA GAPS/etc) Effective Dates : (CCYY-MM-DD/CCYY-MM-DD) Additional Information : (multiple lines) 9.2.1 Multipath Sources : (METAL ROOF/DOME/VLBI ANTENNA/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) 9.3.1 Signal Obstructions : (TREES/BUILDINGS/etc) Effective Dates : (CCYY-MM-DD/CCYY-MM-DD) Additional Information : (multiple lines) 9.3.x Signal Obstructions : (TREES/BUILDINGS/etc) Effective Dates : (CCYY-MM-DD/CCYY-MM-DD) Additional Information : (multiple lines) 10. Local Episodic Effects Possibly Affecting Data Quality 10.1 Date : (CCYY-MM-DD/CCYY-MM-DD) Event : (TREE CLEARING/CONSTRUCTION/etc) 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 Research Laboratory Preferred Abbreviation : NRL Mailing Address : 4555 Overlook Ave SW : Washington, DC 20375 Primary Contact Contact Name : Ken Senior Telephone (primary) : +1 202 767 2043 Telephone (secondary) : +1 202 767 2595 Fax : +1 202 767 2845 E-mail : Ken.Senior@nrl.navy.mil Secondary Contact Contact Name : Joe White Telephone (primary) : +1 202 767 5111 Telephone (secondary) : +1 202 767 2595 Fax : +1 202 767 2845 E-mail : Joe.White@nrl.navy.mil Additional Information : 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 : CDDIS Secondary Data Center : SOPAC URL for More Information : https://goby.nrl.navy.mil/NRL1/ Hardcopy on File Site Map : (Y or URL) Site Diagram : (Y or URL) Horizon Mask : (Y or URL) Monument Description : (Y or URL) Site Pictures : https://goby.nrl.navy.mil/NRL1/images/ Additional Information : : : FULL SYSTEM TIMING CALIBRATION: : : TOTAL (L1) = REC - TtP + Antenna + Cable : = 294.8 + 23.6 + 25.3 + 109.46 : = 453.16 ns : : TOTAL (L2) = REC - TtP + Antenna + Cable : = 307.4 + 23.6 + 26.3 + 109.46 : = 466.76 ns : : TOTAL (L3) = REC - TtP + Antenna + Cable : = 275.4 + 23.6 + 23.8 + 109.46 : = 432.26 ns Antenna Graphics with Dimensions ----- / + \ <-- 0.128 L2 | + | <-- 0.110 L1 +--------------------------------------------------+ <-- 0.102 TCR | | | | | | | | +-+--------------------------------------------------+-+ <-- 0.038 +-------------------+-------------+--------------------+ <-- 0.035 BCR | | | | +------x------+ <-- 0.000 BPA <-- 0.381 --> BPA: Bottom of Preamplifier L1 : L1 Phase Center L2 : L2 Phase Center TCR: Top of Chokering BCR: Bottom of Chokering