International GPS Service ALRT Site Information Form See Instructions at: ftp://igscb.jpl.nasa.gov/pub/station/general/sitelog_instr.txt 0. Form Prepared by (full name) : Mike Craymer Date Prepared : 2007-10-23 Report Type : UPDATE If Update: Previous Site Log : alrt_20070425.log Modified/Added Sections : 10.9 1. Site Identification of the GNSS Monument Site Name : Alert Four Character ID : ALRT Monument Inscription : M029001 IERS DOMES Number : 40162M001 CDP Number : N/A Monument Description : Galvanized steel pipe Height of the Monument : 2 m Monument Foundation : Permafrost and shale Foundation Depth : 6 m Marker Description : Brass plate with steel centering bolt Date Installed : 2002-07-15 Geologic Characteristic : Bedrock Type : Shale Bedrock Condition : Fracture Spacing : Fault zones nearby : No Distance/activity : (multiple lines) Additional Information : The GPS reference mark consists of a brass plate with a forced centering stainless steel bolt cemented on top of a 12.7cm diameter, 8m long galvanized steel pipe, set in shale and permafrost to a depth of 6m. A slurry was poured into the pipe to ground level and insulation added to a 0.3m from the top. Cement was used to top off the remaining part for setting the brass plate. A 0.8m high, 3m square berme was built around the above-ground section of the pipe. A 25 cm diameter culvert was placed around the pipe and filed with sand, and a 0.8m high, 3m square berme built around it. 2. Site Location Information City or Town : Alert (Ellesmere Island) State or Province : Nunavut Country : Canada Tectonic Plate : North American Approximate Position (ITRF) X coordinate (m) : 388042.75 Y coordinate (m) : -740382.40 Z coordinate (m) : 6302001.85 Latitude (N is +) : +822939.46 Longitude (E is +) : -0622025.66 Elevation (m,ellips.) : 78.11 Additional Information : 3. GNSS Receiver Information 3.1 Receiver Type : ASHTECH UZ-12 Satellite System : GPS Serial Number : ZR520021002 Firmware Version : CJ00 Elevation Cutoff Setting : 0 deg Date Installed : 2002-07-16 Date Removed : 2005-08-12T00:00Z Temperature Stabiliz. : NONE Additional Information : 3.2 Receiver Type : ASHTECH UZ-12 Satellite System : GPS Serial Number : ZR520021002 Firmware Version : CK00 Elevation Cutoff Setting : 0 deg Date Installed : 2005-08-12T02:02Z Date Removed : (CCYY-MM-DDThh:mmZ) Temperature Stabiliz. : NONE 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 : ASH701945C_M Serial Number : CR520020903 Antenna Reference Point : BPA Marker->ARP Up Ecc. (m) : 0.1000 Marker->ARP North Ecc(m) : 0.0000 Marker->ARP East Ecc(m) : 0.0000 Alignment from True N : 0 Antenna Radome Type : NONE Radome Serial Number : Antenna Cable Type : LMR-240 coaxial cable, Times Microwave System 68999 Antenna Cable Length : 30 m Date Installed : 2002-07-16 Date Removed : (CCYY-MM-DDThh:mmZ) Additional Information : 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) : 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 : Internal Input Frequency : Effective Dates : 2002-07-16/CCYY-MM-DD Notes : 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.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.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.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.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.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 : Tide gauge 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 10.1 Date : 2006-01-06T14:40Z/2006-01-06T14:50Z Event : Removed hard packed snow from antenna choke rings 10.2 Date : 2006-01-15T16:33Z/2006-01-15T16:39Z Event : Removed hard packed snow from antenna choke rings 10.3 Date : 2006-02-20T19:55Z/2006-02-20T20:00Z Event : Removed light dry snow from antenna choke rings 10.4 Date : 2006-03-09T19:34Z/2006-03-09T19:40Z Event : Removed light dry snow from antenna choke rings 10.5 Date : 2006-03-22T19:00Z/2006-03-22T19:01Z Event : Removed light dry snow from antenna choke rings 10.6 Date : 2006-12-18T18:30Z/2006-12-18T18:44Z Event : Removed hard packed snow from antenna choke rings 10.7 Date : 2007-02-02T18:25Z/2007-02-02T18:35Z Event : Removed hard packed snow from antenna choke rings 10.8 Date : 2007-04-25T11:57Z/2007-04-25T11:58Z Event : Removed hard packed snow from antenna choke rings 10.9 Date : 2007-10-23T16:59Z/2007-10-23T16:04Z Event : Removed snow from antenna choke rings 10.x Date : (CCYY-MM-DD/CCYY-MM-DD) Event : (TREE CLEARING/CONSTRUCTION/etc) 11. On-Site, Point of Contact Agency Information Agency : Natural Resources Canada Preferred Abbreviation : NRCan/GSD Mailing Address : 615 Booth Street Primary Contact Contact Name : Mike Craymer Telephone (primary) : (613) 947-1829 Telephone (secondary) : Fax : (613) 992-6628 E-mail : craymer@nrcan.gc.ca Secondary Contact Contact Name : Jason Silliker Telephone (primary) : (613) 992-4367 Telephone (secondary) : Fax : (613) 992-6628 E-mail : jsillike@nrcan.gc.ca Additional Information : (multiple lines) 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 : NRCan/GSD URL for More Information : Hardcopy on File Site Map : Y Site Diagram : Y Horizon Mask : Y Monument Description : Y Site Pictures : Y Additional Information : Antenna Graphics with Dimensions Ashtech: ASH701945C_M ----- / + \ <-- 0.228 L2 | + | <-- 0.210 L1 +--------------------------------------------------+ <-- 0.202 TCR | | | | | | | | +-+--------------------------------------------------+-+ <-- 0.138 +-------------------+-------------+--------------------+ <-- 0.135 BCR <-- | 0.381 | --> | +-+ | +=====| |=====+ <-- 0.100 ARP | | | | | | Mount => | | | | | | | +-+ | +----------------+=====| |=====+-----------------+ <-- 0.000 MRP | | | | | STAINLESS STEEL PILLAR | | | | | ARP: Antenna Reference Point MRP: Monument Reference Point L1 : L1 Phase Center L2 : L2 Phase Center TCR: Top of Chokering BCR: Bottom of Chokering