SEY100SYC Site Information Form (site log) International GNSS Service See Instructions at: https://ftp.igs.org/pub/station/general/sitelog_instr.txt 0. Form Prepared by (full name) : Sarah Doelger Date Prepared : 2021-05-05 Report Type : UPDATE If Update: Previous Site Log : sey1_20160505.log Modified/Added Sections : 12 1. Site Identification of the GNSS Monument Site Name : Republic of Seychelles Permanent Four Character ID : SEY1 Monument Inscription : 4016-S IERS DOMES Number : 39801M001 CDP Number : none Monument Description : Seismic wellhead steel pipe Height of the Monument : 0.0254 m Monument Foundation : Steel pipe grouted to granite Foundation Depth : 100 m Marker Description : Mark in steel plate Date Installed : 1995-05-15T00:00Z Geologic Characteristic : Bedrock Bedrock Type : IGNEOUS Bedrock Condition : Fracture Spacing : Fault zones nearby : Distance/activity : Additional Information : Monument was removed and the station : decommissioned on 2016-03-04. The IGS site has : been transferred to the SEY2 monument, which : was built adjacent to SEY1 and has been running : continuously since 2015-03-06. 2. Site Location Information City or Town : La Misere State or Province : Mahe Island Country : Seychelles Tectonic Plate : EAST AFRICAN Approximate Position (ITRF) X coordinate (m) : 3602870.9328 Y coordinate (m) : 5238175.0780 Z coordinate (m) : -516275.4452 Latitude (N is +) : -044025.3877 Longitude (E is +) : +0552845.8577 Elevation (m,ellips.) : 537.9123 Additional Information : Site is collocated with the seismic station : of UCSD on the lower pad of the former Air : Force Tracking Station,10km NW of the : International Airport at an altitute of 575m : above sea level. 3. GNSS Receiver Information 3.1 Receiver Type : ROGUE SNR-8000 Satellite System : GPS Serial Number : T334 Firmware Version : 3.2 link 3/9/1995 Elevation Cutoff Setting : 4 deg Date Installed : 1995-05-15T00:00Z Date Removed : 1996-08-25T00:00Z Temperature Stabiliz. : NONE Additional Information : Serial Port B connected to computer's serial : port (COM3). 3.2 Receiver Type : ROGUE SNR-8000 Satellite System : GPS Serial Number : T391 Firmware Version : 3.2 LINK 3/9/1995 Elevation Cutoff Setting : 4 deg Date Installed : 1996-08-25T00:00Z Date Removed : 1998-08-13T00:00Z Temperature Stabiliz. : NONE Additional Information : 3.3 Receiver Type : ROGUE SNR-8000 Satellite System : GPS Serial Number : T194 Firmware Version : 3.2 Elevation Cutoff Setting : 4 deg Date Installed : 1998-08-13T00:00Z Date Removed : 1999-04-29T00:00Z Temperature Stabiliz. : NONE Additional Information : Standard 8-channel T-Rogue receiver, 10Mb : flashcard, 30 sec sampling rate. 3.4 Receiver Type : ROGUE SNR-8000 Satellite System : GPS Serial Number : T194 Firmware Version : 3.2.32.8 Elevation Cutoff Setting : 4 deg Date Installed : 1999-04-29T00:00Z Date Removed : 2003-02-06T00:00Z Temperature Stabiliz. : NONE Additional Information : Serial Port B connected to computer's serial : port (COM3). 3.5 Receiver Type : ASHTECH UZ-12 Satellite System : GPS Serial Number : zr520013802 Firmware Version : CJ12 Elevation Cutoff Setting : 0 deg Date Installed : 2003-02-06T00:00Z Date Removed : 2004-06-21T00:00Z Temperature Stabiliz. : NONE Additional Information : 3.6 Receiver Type : ASHTECH UZ-12 Satellite System : GPS Serial Number : UC1200345005 Firmware Version : CN00 Elevation Cutoff Setting : 0 deg Date Installed : 2004-06-21T00:00Z Date Removed : 2005-04-01T02:14Z Temperature Stabiliz. : NONE Additional Information : 3.7 Receiver Type : ASHTECH UZ-12 Satellite System : GPS Serial Number : UC120031609 Firmware Version : CQ00 Elevation Cutoff Setting : 0 deg Date Installed : 2006-03-07T17:30Z Date Removed : 2006-11-20T00:00Z Temperature Stabiliz. : NONE Additional Information : 3.8 Receiver Type : ASHTECH UZ-12 Satellite System : GPS Serial Number : ZR220013847 Firmware Version : CQ00 Elevation Cutoff Setting : 0 deg Date Installed : 2007-04-09T21:30Z Date Removed : 2007-04-11T08:45Z Temperature Stabiliz. : NONE Additional Information : 3.9 Receiver Type : ASHTECH UZ-12 Satellite System : GPS Serial Number : UC1200325010 Firmware Version : CN00 Elevation Cutoff Setting : 0 deg Date Installed : 2007-06-29T00:00Z Date Removed : 2007-12-07T08:00Z Temperature Stabiliz. : NONE Additional Information : 3.10 Receiver Type : ASHTECH UZ-12 Satellite System : GPS Serial Number : ZR520021802 Firmware Version : CQ00 Elevation Cutoff Setting : 4 deg Date Installed : 2007-12-07T09:00Z Date Removed : 2011-08-02T23:59Z Temperature Stabiliz. : NONE Additional Information : 3.11 Receiver Type : ASHTECH UZ-12 Satellite System : GPS Serial Number : IR2200709004 Firmware Version : CQ00 Elevation Cutoff Setting : 4 deg Date Installed : 2011-08-03T00:00Z Date Removed : 2013-02-06T09:00Z Temperature Stabiliz. : NONE Additional Information : See section 10.2 3.12 Receiver Type : JAVAD TRE_G3TH DELTA Satellite System : GPS+GLO Serial Number : 01322 Firmware Version : 3.4.8 Elevation Cutoff Setting : 4 deg Date Installed : 2013-05-15T17:36Z Date Removed : 2013-05-23T16:17Z Temperature Stabiliz. : NONE Additional Information : See section 10.3 3.13 Receiver Type : JAVAD TRE_G3TH DELTA Satellite System : GPS+GLO Serial Number : 01321 Firmware Version : 3.5.2b1 Elevation Cutoff Setting : 4 deg Date Installed : 2013-07-22T14:30Z Date Removed : 2013-09-30T15:38Z Temperature Stabiliz. : NONE Additional Information : 3.14 Receiver Type : JAVAD TRE_G3TH DELTA Satellite System : GPS+GLO Serial Number : 01321 Firmware Version : 3.5.3 Elevation Cutoff Setting : 4 deg Date Installed : 2013-09-30T15:38Z Date Removed : 2014-03-26T16:29Z Temperature Stabiliz. : NONE Additional Information : 3.15 Receiver Type : JAVAD TRE_G3TH DELTA Satellite System : GPS+GLO Serial Number : 01321 Firmware Version : 3.5.5 Elevation Cutoff Setting : 0 deg Date Installed : 2014-03-26T16:30Z Date Removed : 2014-10-22T01:00Z Temperature Stabiliz. : NONE Additional Information : L1 center = 1573 3.16 Receiver Type : JAVAD TRE_G3TH DELTA Satellite System : GPS+GLO Serial Number : 01321 Firmware Version : 3.5.7b0 Elevation Cutoff Setting : 0 deg Date Installed : 2014-10-22T01:30Z Date Removed : 2015-01-21T00:06Z Temperature Stabiliz. : NONE Additional Information : SBAS off, L1 center = 1573 3.17 Receiver Type : JAVAD TRE_G3TH DELTA Satellite System : GPS+GLO Serial Number : 01321 Firmware Version : 3.5.8b0-12-52e9 Elevation Cutoff Setting : 0 deg Date Installed : 2015-01-21T00:07Z Date Removed : 2016-03-04T00:00Z Temperature Stabiliz. : NONE Additional Information : SBAS off, L1 center = 1573. Station SEY1 has : been decommissioned. The receiver was removed : and installed at SEY2. 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 : AOAD/M_T DOME Serial Number : 427 Antenna Reference Point : BPA Marker->ARP Up Ecc. (m) : 0.5011 Marker->ARP North Ecc(m) : 0.0000 Marker->ARP East Ecc(m) : 0.0000 Alignment from True N : 0 deg Antenna Radome Type : DOME Radome Serial Number : Antenna Cable Type : Antenna Cable Length : Date Installed : 1995-05-15T00:00Z Date Removed : 1996-02-01T00:00Z Additional Information : Located within a PVC enclosure. 4.2 Antenna Type : AOAD/M_T DOME Serial Number : 487 Antenna Reference Point : BPA Marker->ARP Up Ecc. (m) : 0.5011 Marker->ARP North Ecc(m) : 0.0000 Marker->ARP East Ecc(m) : 0.0000 Alignment from True N : 0 deg Antenna Radome Type : DOME Radome Serial Number : Antenna Cable Type : Antenna Cable Length : Date Installed : 1996-02-01T00:00Z Date Removed : 1998-08-13T00:00Z Additional Information : Located within a PVC enclosure. 4.3 Antenna Type : AOAD/M_T DOME Serial Number : 233 Antenna Reference Point : BPA Marker->ARP Up Ecc. (m) : 1.2065 Marker->ARP North Ecc(m) : 0.0000 Marker->ARP East Ecc(m) : 0.0000 Alignment from True N : -6 deg Antenna Radome Type : DOME Radome Serial Number : Antenna Cable Type : Antenna Cable Length : Date Installed : 1998-08-13T00:00Z Date Removed : 2003-02-06T00:00Z Additional Information : Antenna is within a PVC enclosure; 26" clear : raydome protects antenna. The antenna is : screwed onto a modified UNAVCO spike mount : with a fixed height of 1.2065m (the rod was : machined at 47.500"). 4.4 Antenna Type : ASH701945C_M DOME Serial Number : cr20004605 Antenna Reference Point : BPA Marker->ARP Up Ecc. (m) : 1.2065 Marker->ARP North Ecc(m) : 0.0000 Marker->ARP East Ecc(m) : 0.0000 Alignment from True N : -6 deg Antenna Radome Type : DOME Radome Serial Number : Antenna Cable Type : Antenna Cable Length : Date Installed : 2003-02-06T00:00Z Date Removed : 2006-11-20T00:00Z Additional Information : Antenna is within a PVC enclosure; 26" clear : raydome protects antenna. The antenna is : screwed onto a modified UNAVCO spike mount : with a fixed height of 1.2065m (the rod was : machined at 47.500"). Antenna is aligned to : magnetic north. 4.5 Antenna Type : ASH701945B_M DOME Serial Number : CR519992106 Antenna Reference Point : BPA Marker->ARP Up Ecc. (m) : 1.2065 Marker->ARP North Ecc(m) : 0.0000 Marker->ARP East Ecc(m) : 0.0000 Alignment from True N : -6 deg Antenna Radome Type : DOME Radome Serial Number : Antenna Cable Type : Antenna Cable Length : Date Installed : 2007-04-09T21:30Z Date Removed : 2007-04-11T08:45Z Additional Information : Antenna is within a PVC enclosure; 26" clear : raydome protects antenna. The antenna is : screwed onto a modified UNAVCO spike mount : with a fixed height of 1.2065m (the rod was : machined at 47.500"). Antenna is aligned to : magnetic north. 4.6 Antenna Type : ASH701945B_M DOME Serial Number : CR519993002 Antenna Reference Point : BPA Marker->ARP Up Ecc. (m) : 1.2065 Marker->ARP North Ecc(m) : 0.0000 Marker->ARP East Ecc(m) : 0.0000 Alignment from True N : -6 deg Antenna Radome Type : DOME Radome Serial Number : Antenna Cable Type : Antenna Cable Length : Date Installed : 2007-06-29T00:00Z Date Removed : 2011-08-02T23:59Z Additional Information : Antenna is within a PVC enclosure; 26" clear : raydome protects antenna. The antenna is : screwed onto a modified UNAVCO spike mount : with a fixed height of 1.2065m (the rod was : machined at 47.500"). Antenna is aligned to : magnetic north. 4.7 Antenna Type : ASH701945E_M NONE Serial Number : CR6200548023 Antenna Reference Point : BPA Marker->ARP Up Ecc. (m) : 1.2065 Marker->ARP North Ecc(m) : 0.0000 Marker->ARP East Ecc(m) : 0.0000 Alignment from True N : Antenna Radome Type : NONE Radome Serial Number : Antenna Cable Type : Time LMR 400 Antenna Cable Length : Date Installed : 2011-08-03T00:00Z Date Removed : 2016-03-04T00:00Z Additional Information : Dome broken, appears a large object was dropped : onto antenna. Guy wires for 220ft tower : installed by Sheik travel directly over : antenna. On 2016-03-04 the SEY1 monument was : decommissioned. The monument has been : demolished and the antenna retired. The IGS : site now operates on the adjacent SEY2 monument : with a new antenna. 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 : 1995-05-15/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 : Seismic Status : PERMANENT Effective Dates : 1998-08-13/CCYY-MM-DD Notes : UCSD operates a seismic station collocated : with the GPS site. 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 : MET3 Manufacturer : Paroscientific Serial Number : 69944 Data Sampling Interval : 300 sec Accuracy (% rel h) : 2 Aspiration : Height Diff to Ant : 2 m Calibration date : (CCYY-MM-DD) Effective Dates : 2003-02-06/2014-06-01 Notes : 8.1.2 Humidity Sensor Model : MET4 Manufacturer : Paroscientific Serial Number : 118041 Data Sampling Interval : 60 sec Accuracy (% rel h) : 2 Aspiration : UNASPIRATED Height Diff to Ant : 1 m Calibration date : (CCYY-MM-DD) Effective Dates : 2015-05-04/CCYY-MM-DD Notes : 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 : MET3 Manufacturer : Paroscientific Serial Number : 69944 Data Sampling Interval : 300 sec Accuracy : 0.010 hPa Height Diff to Ant : 2 m Calibration date : (CCYY-MM-DD) Effective Dates : 2003-02-06/2014-06-01 Notes : 8.2.2 Pressure Sensor Model : MET4 Manufacturer : Paroscientific Serial Number : 118041 Data Sampling Interval : 60 sec Accuracy : 0.010 hPa Height Diff to Ant : 1 m Calibration date : (CCYY-MM-DD) Effective Dates : 2015-05-04/CCYY-MM-DD Notes : 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 : MET3 Manufacturer : Paroscientific Serial Number : 69944 Data Sampling Interval : 300 sec Accuracy : 0.5 deg C Aspiration : Height Diff to Ant : 2 m Calibration date : Effective Dates : 2003-02-06/2014-06-01 Notes : 8.3.2 Temp. Sensor Model : MET4 Manufacturer : Paroscientific Serial Number : 118041 Data Sampling Interval : 60 sec Accuracy : 0.5 deg C Aspiration : UNASPIRATED Height Diff to Ant : 1 m Calibration date : Effective Dates : 2015-05-04/CCYY-MM-DD Notes : 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) 9.2.1 Multipath Sources : 220 ft metal tower Effective Dates : 2011-08-03/2015-03-04 Additional Information : 220 ft tower is guy wired into ground between : recording room and seismic wellhead (antenna). : Guy wires pass directly over GPS antenna. : Site being used as vehicle turnaround, antenna : cable is driven over each time. : New Dormitory built 80-100 yards below site : which houses 80-100 people. 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 Effective Dates : 2004-06-21/CCYY-MM-DD Additional Information : Continuously growing trees around : antenna will affect signal reception. 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 : 2012-03-26/2012-03-26 Event : Transitioned from .soc to .ash data types. For : soc data typed used soc2rnx to do the : conversion to RINEX data. For ash data types : using teqc directly to do the conversion to : RINEX. 10.2 Date : 2013-02-06/2013-05-15 Event : Ashtech receiver failed on 2013-02-06. : It was replaced with a Javad receiver on : 2013-05-14. There is a data gap from 2013-02-06 : to 2013-05-15. 10.3 Date : 2013-05-23/2013-07-22 Event : Javad receiver did not come back up after : firmware update, so it was replaced. 10.4 Date : 2013-07-22/2013-07-22 Event : L1 center frequency offset to 1573 from nominal : 1575, allowing some functional BeiDou tracking. 10.x Date : (CCYY-MM-DD/CCYY-MM-DD) Event : (TREE CLEARING/CONSTRUCTION/etc) 11. On-Site, Point of Contact Agency Information Agency : Seychelles Petroleum Company Ltd. Preferred Abbreviation : SEYPEC Mailing Address : P.O. Box 222 : Victoria : Seychelles Primary Contact Contact Name : Vincent Horeau Telephone (primary) : +248-224240 Telephone (secondary) : Fax : +284-224456 E-mail : Secondary Contact Contact Name : Brown Horter Telephone (primary) : Telephone (secondary) : Fax : E-mail : B.Horter@petroseychelles.com Additional Information : 12. Responsible Agency (if different from 11.) Agency : Jet Propulsion Laboratory Preferred Abbreviation : JPL Mailing Address : 4800 Oak Grove Drive : Pasadena, CA : USA 91109 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 : Sarah Doelger Telephone (primary) : 303-381-7520 Telephone (secondary) : Fax : 303-381-7451 E-mail : ggn-ops@postal.unavco.org Additional Information : 13. More Information Primary Data Center : JPL Secondary Data Center : CDDIS URL for More Information : Hardcopy on File Site Map : Y Site Diagram : Y Horizon Mask : N Monument Description : Y Site Pictures : Y Additional Information : Updated antenna graphics below. Antenna Graphics with Dimensions ASH701945B_M ASH701945C_M ASH701945D_M ASH701945E_M ASH701945G_M +-------+ / \ | | +-----------------+-------------+-----------------+ <-- 0.1006 TCR | | | | | | | | +-+-------------------------------------------------+-+ <-- 0.0376 +-------------------+-------------+-------------------+ <-- 0.0346 BCR | | | | +------x------+ <-- 0.0000 BPA=ARP <-- 0.3794 --> 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.