GODS00USA Site Information Form (site log) International GNSS Service See Instructions at: ftp://igs.org/pub/station/general/sitelog_instr.txt 0. Form Prepared by (full name) : Tatevik Shakhbandaryan Date Prepared : 2018-09-28 Report Type : UPDATE If Update: Previous Site Log : gods_20151022.log Modified/Added Sections : 2,3.7,3.8 1. Site Identification of the GNSS Monument Site Name : GGAO SOUTH DEEP DRILL BRACED MONUMENT Four Character ID : GODS Monument Inscription : IERS DOMES Number : 40451M128 CDP Number : none Monument Description : DEEP DRILL BRACED MONUMENT Height of the Monument : 1.5 m Monument Foundation : 1.25 inch SS pipe cemented into Foundation Depth : 12.192 m Marker Description : SCIGN MOUNT MARK Date Installed : 2012-01-13T00:00Z Geologic Characteristic : SAND/CLAY/CONGLOMERATE Bedrock Type : Bedrock Condition : Fracture Spacing : Fault zones nearby : Distance/activity : Additional Information : LINE OF SIGHT TO VLBI, SLR, DORIS, AND GNSS 2. Site Location Information City or Town : Greenbelt State or Province : Maryland Country : United States of America Tectonic Plate : NORTH AMERICAN Approximate Position (ITRF) X coordinate (m) : 1130752.3046 Y coordinate (m) : -4831349.1223 Z coordinate (m) : 3994098.9504 Latitude (N is +) : +390205.2 Longitude (E is +) : -0768273.1 Elevation (m,ellips.) : 19.100 Additional Information : 3. GNSS Receiver Information 3.1 Receiver Type : JAVAD TRE_G3TH DELTA Satellite System : GPS+GLO Serial Number : 00580 Firmware Version : 3.3.5 Elevation Cutoff Setting : 4 deg Date Installed : 2012-01-14T00:00Z Date Removed : 2012-08-30T00:00Z Temperature Stabiliz. : none Additional Information : 3.2 Receiver Type : JAVAD TRE_G3TH DELTA Satellite System : GPS+GLO Serial Number : 00580 Firmware Version : 3.3.12 Elevation Cutoff Setting : 4 deg Date Installed : 2012-08-30T00:00Z Date Removed : 2013-04-01T17:34Z Temperature Stabiliz. : none Additional Information : 3.3 Receiver Type : JAVAD TRE_G3TH DELTA Satellite System : GPS+GLO Serial Number : 00580 Firmware Version : 3.4.7 Elevation Cutoff Setting : 4 deg Date Installed : 2013-04-01T17:34Z Date Removed : 2013-05-22T20:31Z Temperature Stabiliz. : none Additional Information : 3.4 Receiver Type : JAVAD TRE_G3TH DELTA Satellite System : GPS+GLO Serial Number : 00580 Firmware Version : 3.4.9 Elevation Cutoff Setting : 4 deg Date Installed : 2013-05-22T21:02Z Date Removed : 2013-10-31T21:20Z Temperature Stabiliz. : none Additional Information : 3.5 Receiver Type : JAVAD TRE_G3TH DELTA Satellite System : GPS+GLO Serial Number : 00580 Firmware Version : 3.4.12 Elevation Cutoff Setting : 4 deg Date Installed : 2013-10-31T21:20Z Date Removed : 2014-04-10T19:44Z Temperature Stabiliz. : none Additional Information : 3.6 Receiver Type : JAVAD TRE_G3TH DELTA Satellite System : GPS+GLO Serial Number : 00580 Firmware Version : 3.5.5 Elevation Cutoff Setting : 0 deg Date Installed : 2014-04-10T19:45Z Date Removed : 2015-09-14T20:44Z Temperature Stabiliz. : none Additional Information : L1 center offset to 1573 3.7 Receiver Type : JAVAD TRE_3 DELTA Satellite System : GPS+GLO Serial Number : 02123 Firmware Version : 3.6.3 Elevation Cutoff Setting : 0 deg Date Installed : 2015-09-14T20:45Z Date Removed : 2018-09-27T00:00Z Temperature Stabiliz. : none Additional Information : L1 center offset to 1573 3.8 Receiver Type : JAVAD TRE_3 DELTA Satellite System : GPS+GLO+GAL+BDS Serial Number : 02702 Firmware Version : 3.7.2 Elevation Cutoff Setting : 0 deg Date Installed : 2018-09-28T11:15Z 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+GLO+GAL+BDS+QZSS+SBAS) Serial Number : (A20, but note the first A5 is used in SINEX) 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 : TPSCR.G3 SCIS Serial Number : 383-1029 Antenna Reference Point : BPA Marker->ARP Up Ecc. (m) : 0.0083 Marker->ARP North Ecc(m) : 0.0000 Marker->ARP East Ecc(m) : 0.0000 Alignment from True N : 0 deg Antenna Radome Type : SCIS Radome Serial Number : 1239 Antenna Cable Type : LMR600 Antenna Cable Length : 40 m Date Installed : 2012-01-14T00:00Z 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) : (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 : INTERNAL Input Frequency : Effective Dates : 2012-01-14/2013-05-01 Notes : 6.2 Standard Type : EXTERNAL Input Frequency : 5 MHz Effective Dates : 2013-05-01/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 7.1 Instrumentation Type : SLR/VLBI/DORIS Status : PERMANENT Effective Dates : 2012-01-14/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.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 : (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.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 : (multiple lines) 9. Local Ongoing Conditions Possibly Affecting Computed Position 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.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/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 : 2012-08-19/2012-08-19 Event : Saw degradation in track for GODS. : At this point GODS is running on : internal clock with steering enabled. 10.2 Date : 2012-08-23/2012-08-23 Event : Dave reported that clock steering : may be broken. 10.3 Date : 2012-08-30/2012-08-30 Event : Receiver firmware got updated and : clock steering got set to off. Starting from : 2012.243 JPL stopped seeing track degradation. 10.4 Date : 2012-09-19/2012-09-19 Event : GODS clock steering was temporarily set to tied : to collect data for Javad tech analysis. : It was then reverted back to no steering. : This only lasted 15minutes. 10.5 Date : 2012-09-20/2012-09-20 Event : the r/R solution was implemented around : 19:45 and testing began. GODS continued to be : on internal clock with steering off. 10.6 Date : 2012-09-28/2012-09-28 Event : the javad.py running r/R solution was replaced : with a javad.py running new clock steering : commands to test possible clock steering fix. 10.7 Date : 2012-09-29/2012-09-29 Event : the javad.py running new clock steering : commands was replaced with javad.py running : r/R solution. At this point clock steering was : not set to off and track degradation : was introduced again. 10.8 Date : 2012-10-01/2012-10-01 Event : updated javad_gods.py to set clock steering off 10.9 Date : 2012-12-21/2012-12-21 Event : dropped the +C2 teqc option starting 23:00UTC. 10.x Date : (CCYY-MM-DD/CCYY-MM-DD) Event : (TREE CLEARING/CONSTRUCTION/etc) 11. On-Site, Point of Contact Agency Information Agency : NASA Goddard Space Flight Center Preferred Abbreviation : GSFC Mailing Address : Space Geodesy Branch, Code 926.9 : 8800 Greenbelt Road : Greenbelt, MD 20771 USA Primary Contact Contact Name : Mike Perry Telephone (primary) : 301-286-5300 Telephone (secondary) : Fax : E-mail : michael.a.perry@nasa.gov Secondary Contact Contact Name : James Long Telephone (primary) : 301-286-9836 Telephone (secondary) : Fax : E-mail : james.l.long@nasa.gov Additional Information : 12. Responsible Agency (if different from 11.) Agency : Jet Propulsion Laboratory Preferred Abbreviation : JPL Mailing Address : 4800 Oak Grove Drive : Pasadena, CA 91109 USA Primary Contact Contact Name : David A. Stowers Telephone (primary) : 818-354-7055 Telephone (secondary) : Fax : 818-393-4965 E-mail : dstowers@jpl.nasa.gov Secondary Contact Contact Name : UNAVCO/JPL Telephone (primary) : 303-381-7500 Telephone (secondary) : Fax : 303-381-7451 E-mail : ggn-ops@ls.unavco.org Additional Information : ggn@jpl.nasa.gov 13. More Information Primary Data Center : JPL Secondary Data Center : CDDIS URL for More Information : Hardcopy on File Site Map : Site Diagram : Horizon Mask : Monument Description : Site Pictures : Additional Information : Antenna Graphics with Dimensions TPSCR.G3 +-------+ / \ | | +-----------------+-------------+-----------------+ <-- 0.1015 TCR | | | | | | | | +-+-------------------------------------------------+-+ +-------------------+-------------+-------------------+ <-- 0.0345 BCR | | | | +------x------+ <-- 0.0000 BPA=ARP <-- 0.2380 --> <-- 0.3800 --> Abbreviations ------------- ARP: antenna reference point BAM: bottom of antenna mount BCR: bottom of chokering BDG: bottom of dome ground plane BGP: bottom of ground plane BPA: bottom of preamplifier TCR: top of chokering TDG: top of dome ground plane TGP: top of ground plane TOP: top of pole TPA: top of preamplifier Dimensions ---------- All dimensions are in meters.