Quick Links
- Network Map
- List of Stations
- Monthly Report Card
- Quarterly Report Card
- Network Status Page
- Potsdam CPF time bias service
- Procedure for estimating laser beam divergence
- Recent Station Upgrades
- Network station application form
- Revised ILRS station screening process at ILRS Operations Centers (NASA and EDC)
Herstmonceux: Site Log
Instructions and Update Site Log
You can use the hyperlinks to quickly get to the section of interest or you can scroll down to read them all.
Section: 0. Form
Section: 1. Identification of the Ranging System Reference Point (SRP)
Section: 2. Site Location Information
Section: 3. General System Information
Section: 4. Telescope Information
Section: 5. Laser System Information
Section: 6. Receiver System
Section: 7. Tracking Capabilities
Section: 8. Calibration
Section: 9. Time and Frequency Standards
Section: 10. Preprocessing Information
Section: 11. Aircraft Detection
Section: 12. Meteorological Instrumentation
Section: 13. Local Ties, Eccentricities, and Collocation Information
Section: 14. Local Events Possibly Affecting Computed Position
Section: 15. On-Site, Point of Contact Agency Information
Section: 16. Responsible Agency (if different from 15.)
Section: 17. More Information
ILRS Site and System Information Form International Laser Ranging Service 0. Form Prepared by (Full Name) : Robert Sherwood Preparer E-mail : rshe@nerc.ac.uk Date Prepared : 2024-04-04 Report Type : UPDATE Site Log Format Version : 2.0 Site Log Revision : Back to top 1. Identification of the Ranging System Reference Point (SRP) Site Name : Herstmonceux IERS DOMES Number : 13212S001 CDP Pad ID : 7840 Subnetwork : EUROLAS Description : AZ EL INTERSECT Monument Description : N.A. Monument Inscription : N.A. Mark Description : N.A. Date Installed : 1982-01-01 Date Removed : Geologic Characteristic : CLAYS/SANDSTONES Additional Information : Local geology: The site is bounded to the : south by old, but now drained, marshland : with the English Channel about 6 km away. : The underlying structure is interbedded : clays and sandstones called the Hastings : Beds. There is no history of seismic : activity in the area. Back to top 2. Site Location Information City or Town : Hailsham State or Province : East Sussex Country : UK Tectonic Plate : Eurasian Local Time (UTC +/- hours) : Approximate Position X coordinate [m]: 4033463.1 Y coordinate [m]: 23662.8 Z coordinate [m]: 4924305.6 Latitude [deg]: 50.8674 N Longitude [deg]: 0.3361 E Elevation [m]: 75 Survey Method : Date Measured : Additional Information : The site is located in the grounds of : Herstmonceux Castle Back to top 3. General System Information 3.01 System Name : Herstmonceux 4-Character Code : HERL CDP System Number : 35 CDP Occupation Number : 01 Eccentricity to SRP (if Not Identical With SRP) North [m]: East [m]: Up [m]: Date Measured : N.A. Date Installed : 1982-01-01 Date Removed : Additional Information : Back to top 4. Telescope Information 4.01 Receiving Telescope Type : CASSEGRAIN Aperture [m]: 0.5 Mount : AZ-EL Date Installed : 1982-01-01 Date Removed : Xmitting Telescope Type : REFRACTOR Aperture [m]: 0.1 Date Installed : 1982-01-01 Date Removed : Tracking Camera Type : TV on wide field Celestron Model : Manufacturer : Field of View [deg]: 2.0 Minimum Magnitude [mag]: 8 Date Installed : Date Removed : Transmit/Receive Path : SEPARATE Transmit/Receive Switch : NONE Max Slew Rate Az [deg/s]: 20 Max Slew Rate El [deg/s]: 5 Max Used Tracking Rate Az : 20 Max Used Tracking Rate El : 5 Telescope Shelter : EYE-LID DOME, see additional information Daylight Filter Type : Oven controlled spectral filter Dayl. Filt. Bandwidth [nm]: 0.15 Adjustable Attenuation : NO Adjustable Field of View : Transmit Efficiency : 0.7 Receive Efficiency : 0.7 Date Installed : 1983-01-01 Date Removed : 2010-09-01 Additional Information : The dome`s hemisphere is divided into 4 : segments the bottom two of which are fixed : to a circular rail and the top two open by : sliding over the bottom two. : The whole structure can be rotated manually, : normally only necessary to protect the : telescope/observer from the wind : since this scheme means that all the sky : above 25 degrees elevation is available with : the dome in any position. In normal operation : the lowest part of the opening are aligned : East-West to provide access to the ground : targets. 4.02 Receiving Telescope Type : CASSEGRAIN Aperture [m]: 0.5 Mount : AZ-EL Date Installed : 2010-09-01 Date Removed : Xmitting Telescope Type : REFRACTOR Aperture [m]: 0.1 Date Installed : 2010-09-01 Date Removed : Tracking Camera Type : TV on wide field Celestron Model : Manufacturer : Field of View [deg]: 2.0 Minimum Magnitude [mag]: 8 Date Installed : Date Removed : Transmit/Receive Path : SEPARATE Transmit/Receive Switch : NONE Max Slew Rate Az [deg/s]: 20 Max Slew Rate El [deg/s]: 5 Max Used Tracking Rate Az : 20 Max Used Tracking Rate El : 5 Telescope Shelter : EYE-LID DOME Daylight Filter Type : Oven controlled spectral filter Dayl. Filt. Bandwidth [nm]: 0.15 Adjustable Attenuation : NO Adjustable Field of View : Transmit Efficiency : 0.7 Receive Efficiency : 0.7 Date Installed : 2010-09-01 Date Removed : Additional Information : The diocroic beam-splitter in the receive : path has been replaced by a modern : equivalent. The diocroic reflects : non-green light to an intensified camera : to enable star and satellite imaging : The new optic`s transmit efficiency is : greater than 95% and its polarisation : discrimination is very low. There is : sufficient reflection (~2%) of : backscattered green laser light to enable : the `beam` to be visible in the camera. Back to top 5. Laser System Information 5.01 Laser Type : ND:YAG Model : Manufacturer : Number of Amplifiers : 2 Primary Wavelength [nm]: 1064 Primary Maximum Energy [mJ]: Secondary Wavelength [nm]: 532 Secondary Max. Energy [mJ]: 20 Xmit Energy Adjustable : NO Additional Information : Pulse Width (FWHM) [ps]: 100 Max. Repetition Rate [Hz]: 14 Fullw. Beam Divergence ["]: 5 - 200 Theoretical Beam Div : Measured Beam Div : Method Used : Additional Information : Final Beam Diameter [m]: 0.03 Eyesafe : NO Eyesafe Standard : British Standard 4803 Polarization on Exit : Laser Fire Control : Laser Energy Monitor : Start Diode Type : Manufactorer : Model : Quantum Efficiency [%]: Rise/Fall Time [ps]: Date Installed : Date Removed : Signal Processing : Manufacturer : Model : Date Installed : Date Removed : Additional Information : Date Installed : 1982-01-01 Date Removed : Additional Information : An observer is always present at the : telescope during ranging and using a slaved : radar system to detect aircraft close to : the beam and kill the laser. For terrestrial : calibration a ND filter is inserted : to render the beam eyesafe. 5.02 Laser Type : ND:VAN Model : Manufacturer : Number of Amplifiers : 2 Primary Wavelength [nm]: 1064 Primary Maximum Energy [mJ]: Secondary Wavelength [nm]: 532 Secondary Max. Energy [mJ]: 0.5 Xmit Energy Adjustable : NO Additional Information : Pulse Width (FWHM) [ps]: 10 Max. Repetition Rate [Hz]: 2000 Fullw. Beam Divergence ["]: 5 - 200 Theoretical Beam Div : Measured Beam Div : Method Used : Additional Information : Final Beam Diameter [m]: 0.03 Eyesafe : NO Eyesafe Standard : British Standard 4803 Polarization on Exit : Laser Fire Control : Laser Energy Monitor : Start Diode Type : Manufactorer : Model : Quantum Efficiency [%]: Rise/Fall Time [ps]: Date Installed : Date Removed : Signal Processing : Manufacturer : Model : Date Installed : Date Removed : Additional Information : Date Installed : 2005-06-01 Date Removed : 2014-10-06 Additional Information : Each one of the two lasers is selectable : by the observer via the control interface : in real time during observing. : For example, for LRO ranging the 14Hz YAG : is employed and the 2kHz VAN for most : other observing, depending on sky : conditions. The control system `knows` : which laser was used for a given pass, : and selects during reduction appropriate : range calibration values from recent : calibration ranging, carried out for each : laser at least hourly. 5.03 Laser Type : ND:YAG Model : Manufacturer : Number of Amplifiers : 2 Primary Wavelength [nm]: 1064 Primary Maximum Energy [mJ]: Secondary Wavelength [nm]: 532 Secondary Max. Energy [mJ]: 1.0 Xmit Energy Adjustable : NO Additional Information : Pulse Width (FWHM) [ps]: 10 Max. Repetition Rate [Hz]: 1000 Fullw. Beam Divergence ["]: 5 - 200 Theoretical Beam Div : Measured Beam Div : Method Used : Additional Information : Final Beam Diameter [m]: 0.03 Eyesafe : NO Eyesafe Standard : British Standard 4803 Polarization on Exit : Laser Fire Control : Laser Energy Monitor : Start Diode Type : Manufactorer : Model : Quantum Efficiency [%]: Rise/Fall Time [ps]: Date Installed : Date Removed : Signal Processing : Manufacturer : Model : Date Installed : Date Removed : Additional Information : Date Installed : 2014-10-06 Date Removed : Additional Information : Upgrade to Nd-Van 2kHz laser system, : now Nd-Yag and gives more energy in the : green (approx 1mj at 1 kHz). : While 2 kHz operation is possible with : less energy per pulse, we are currently : running at 1 kHz. Back to top 6. Receiver System 6.01.01 Primary Chain Wavelength [nm]: 532 Detector Type : CSPAD Manufacturer : PESO Consulting Model : Quantum Efficiency [%]: 20 Nominal Gain : Rise Time [ps]: 1500 Jitter (Single PE)[ps]: 30 Field of View Diam ["]: 20 - 250 Date Installed : 1999-07-30 Date Removed : 2001-01-03 Amplifier Type : Manufacturer : Model : Gain : Bandwidth : Date Installed : Date Removed : Additional Information: Signal Processing : N.A. Manufacturer : Model : Date Installed : Date Removed : Amplitude Measurement : NO Return-Rate Controlled: YES Mode of Operation : Single Photon Additional Information: Time of Flight Observ. : INTERVAL Manufacturer : Stanford Model : 620 Resolution [ps]: 4 Precision [ps]: 30 Date Installed : 1995-01-01 Date Removed : 2007-02-01 Additional Information : Four Stanford counters of varying : ages were used historically - for : details of usage see SCH and : SCI files. The telescope has a field of : view of 10 arc minutes. However this is : reduced to a maximum of 250 arcsecs : by an iris in the light path. : For normal daytime observing : the iris size is reduced to 50 arcsecs. : For normal night observing a 100 arcsecs : iris is used. : Whichever iris is used, the light is : focused onto the detector via a field lens. 6.01.02 Primary Chain Wavelength [nm]: 532 Detector Type : SPAD3b Manufacturer : PESO Consulting Model : Quantum Efficiency [%]: 20 Nominal Gain : Rise Time [ps]: 1500 Jitter (Single PE)[ps]: 30 Field of View Diam ["]: 20 - 250 Date Installed : 2001-01-03 Date Removed : 2001-01-24 Amplifier Type : Manufacturer : Model : Gain : Bandwidth : Date Installed : Date Removed : Additional Information: Signal Processing : N.A. Manufacturer : Model : Date Installed : Date Removed : Amplitude Measurement : NO Return-Rate Controlled: YES Mode of Operation : Single Photon Additional Information: Time of Flight Observ. : INTERVAL Manufacturer : Stanford Model : 620 Resolution [ps]: 4 Precision [ps]: 30 Date Installed : 1995-01-01 Date Removed : 2007-02-01 Additional Information : Four Stanford counters of varying : ages were used historically - for details : of usage see SCH and SCI files. : The telescope has a field of : view of 10 arc minutes. However this is : reduced to a maximum of 250 arcsecs : by an iris in the light path. : For normal daytime observing : the iris size is reduced to 50 arcsecs. : For normal night observing a 100 arcsecs : iris is used. : Whichever iris is used, the light is : focused onto the detector via a field lens. 6.01.03 Primary Chain Wavelength [nm]: 532 Detector Type : CSPAD Manufacturer : PESO Consulting Model : Quantum Efficiency [%]: 20 Nominal Gain : Rise Time [ps]: 1500 Jitter (Single PE)[ps]: 30 Field of View Diam ["]: 20 - 250 Date Installed : 2001-01-24 Date Removed : 2002-10-04 Amplifier Type : Manufacturer : Model : Gain : Bandwidth : Date Installed : Date Removed : Additional Information: Signal Processing : N.A. Manufacturer : Model : Date Installed : Date Removed : Amplitude Measurement : NO Return-Rate Controlled: YES Mode of Operation : Single Photon Additional Information: Time of Flight Observ. : INTERVAL Manufacturer : Stanford Model : 620 Resolution [ps]: 4 Precision [ps]: 30 Date Installed : 1995-01-01 Date Removed : 2007-02-01 Additional Information : Four Stanford counters of varying : ages were used historically - : for details of usage see SCH and : SCI files. The telescope has a field of : view of 10 arc minutes. However this is : reduced to a maximum of 250 arcsecs : by an iris in the light path. : For normal daytime observing : the iris size is reduced to 50 arcsecs. : For normal night observing a 100 arcsecs : iris is used. : Whichever iris is used, the light is : focused onto the detector via a field lens. 6.01.04 Primary Chain Wavelength [nm]: 532 Detector Type : SPAD3b Manufacturer : PESO Consulting Model : Quantum Efficiency [%]: 20 Nominal Gain : Rise Time [ps]: 1500 Jitter (Single PE)[ps]: 30 Field of View Diam ["]: 20 - 250 Date Installed : 2002-10-04 Date Removed : 2002-10-16 Amplifier Type : Manufacturer : Model : Gain : Bandwidth : Date Installed : Date Removed : Additional Information: Signal Processing : N.A. Manufacturer : Model : Date Installed : Date Removed : Amplitude Measurement : NO Return-Rate Controlled: YES Mode of Operation : Single Photon Additional Information: Time of Flight Observ. : INTERVAL Manufacturer : Stanford Model : 620 Resolution [ps]: 4 Precision [ps]: 30 Date Installed : 1995-01-01 Date Removed : 2007-02-01 Additional Information : Four Stanford counters of varying : ages were used historically - : for details of usage see SCH and SCI : files. The telescope has a field of : view of 10 arc minutes. However this is : reduced to a maximum of 250 arcsecs : by an iris in the light path. : For normal daytime observing : the iris size is reduced to 50 arcsecs. : For normal night observing a 100 arcsecs : iris is used. : Whichever iris is used, the light is : focused onto the detector via a field lens. 6.01.05 Primary Chain Wavelength [nm]: 532 Detector Type : CSPAD Manufacturer : PESO Consulting Model : Quantum Efficiency [%]: 20 Nominal Gain : Rise Time [ps]: 1500 Jitter (Single PE)[ps]: 30 Field of View Diam ["]: 20 - 250 Date Installed : 2002-10-16 Date Removed : Amplifier Type : Manufacturer : Model : Gain : Bandwidth : Date Installed : Date Removed : Additional Information: Signal Processing : N.A. Manufacturer : Model : Date Installed : Date Removed : Amplitude Measurement : NO Return-Rate Controlled: YES Mode of Operation : Single Photon Additional Information: Time of Flight Observ. : INTERVAL Manufacturer : Stanford Model : 620 Resolution [ps]: 4 Precision [ps]: 30 Date Installed : 1995-01-01 Date Removed : 2007-02-01 Additional Information : Four Stanford counters of varying : ages were used historically - : for details of usage see SCH and SCI : files. The telescope has a field of : view of 10 arc minutes. However this is : reduced to a maximum of 250 arcsecs : by an iris in the light path. : For normal daytime observing : the iris size is reduced to 50 arcsecs. : For normal night observing a 100 arcsecs : iris is used. : Whichever iris is used, the light is : focused onto the detector via a field lens. 6.01.06 Primary Chain Wavelength [nm]: 532 Detector Type : CSPAD Manufacturer : PESO Consulting Model : Quantum Efficiency [%]: 20 Nominal Gain : Rise Time [ps]: 1500 Jitter (Single PE)[ps]: 30 Field of View Diam ["]: 20 - 250 Date Installed : 2002-10-16 Date Removed : 2009-02-01 Amplifier Type : Manufacturer : Model : Gain : Bandwidth : Date Installed : Date Removed : Additional Information: Signal Processing : N.A. Manufacturer : Model : Date Installed : Date Removed : Amplitude Measurement : NO Return-Rate Controlled: YES Mode of Operation : Single Photon Additional Information: Time of Flight Observ. : Event Timer Manufacturer : Home Build around 3 Thales Modules: Model : 2x timing modules 2396-201-000 No.s 12 & 13 : 1x clock module 3396-211-000 No. 6 Resolution [ps]: 1 Precision [ps]: 5 Date Installed : 2007-02-01 Date Removed : Additional Information : 6.01.07 Primary Chain Wavelength [nm]: 532 Detector Type : SPAD Manufacturer : PESO Consulting Model : Quantum Efficiency [%]: 20 Nominal Gain : Rise Time [ps]: 1500 Jitter (Single PE)[ps]: 30 Field of View Diam ["]: 20 - 250 Date Installed : 2009-02-01 Date Removed : Amplifier Type : Manufacturer : Model : Gain : Bandwidth : Date Installed : Date Removed : Additional Information: Signal Processing : N.A. Manufacturer : Model : Date Installed : Date Removed : Amplitude Measurement : NO Return-Rate Controlled: YES Mode of Operation : Single Photon Additional Information: Time of Flight Observ. : Event Timer Manufacturer : Home build around 3 Thales Modules Model : 2x timing modules 2396-201-000 No.s 12 & 13 : 1x clock module 3396-211-000 No. 6 Resolution [ps]: 1 Precision [ps]: 5 Date Installed : 2007-02-01 Date Removed : Additional Information : 6.02.01 Secondary Chain Wavelength [nm]: Detector Type : Manufacturer : Model : Quantum Efficiency [%]: Nominal Gain : Rise Time [ps]: Jitter (Single PE)[ps]: Field of View Diam ["]: Date Installed : Date Removed : Amplifier Type : Manufacturer : Model : Gain : Bandwidth : Date Installed : Date Removed : Additional Information: Signal Processing : Manufacturer : Model : Date Installed : Date Removed : Amplitude Measurement : Return-Rate Controlled: Mode of Operation : Additional Information: Time of Flight Observ. : Manufacturer : Model : Resolution [ps]: Precision [ps]: Date Installed : Date Removed : Additional Information : 6.03.01 Tertiary Chain Wavelength [nm]: Detector Type : Manufacturer : Model : Quantum Efficiency [%]: Nominal Gain : Rise Time [ps]: Jitter (Single PE)[ps]: Field of View Diam ["]: Date Installed : Date Removed : Amplifier Type : Manufacturer : Model : Gain : Bandwidth : Date Installed : Date Removed : Additional Information: Signal Processing : Manufacturer : Model : Date Installed : Date Removed : Amplitude Measurement : Return-Rate Controlled: Mode of Operation : Additional Information: Time of Flight Observ. : Manufacturer : Model : Resolution [ps]: Precision [ps]: Date Installed : Date Removed : Additional Information : Back to top 7. Tracking Capabilities 7.01 Satellites Very Low Alt (<400 km) : YES Low Altitude (400-2000) : YES LAGEOS/LARES : YES GLONASS : YES Etalon : YES GNSS : YES Geosynchronous : NIGHT Moon : NO Ave. Pass Switch Time [s]: ~30 Average values for LAGEOS Single Shot RMS [mm]: 16 # of Obs per NP : 150 Use of Semi-trains : YES # of Semi-train Tracks : 4 Range Gate Width [ns]: 200 - 30000 Beam Pointing Accuracy ["]: 2 Angle Encoder Resolution["]: 2 Min. Tracking Elev. [deg]: 25 Laser Polarization @emitter: Operation Months per Year : 12 Days per Week : 7 Hours per Day : 20 Staff per Shift : 1 System Shared With : NOTHING Time Allocated to SLR [%]: 100 Remotely Controllable : NO Tracking Restrictions Go/No-go flag : YES Satellite Verification : Date Verified : Maximum elevation : YES Satellite Verification : Date Verified : Pass segments : YES Satellite Verification : Date Verified : Schedule segments : Satellite Verification : Date Verified : Maximum laser power limit: Satellite Verification : Date Verified : Date First Applicable : 1982-01-01 HH:MM UT Date Last Applicable : Additional Information : Hz laser : With no ND filters in the receive path : the daytime range-gate limit is of : order 600ns. However for low satellites : and considerable ND (up to 10^4), a : range gate of 3000ns is possible. In : practice a small range gate 500ns for : low satellites is possible and the : use of observer-entered time bias : corrections is used to level the : satellite O-C track satellite into : the range gate. At night time a RG of : up to 30000ns is possible without : saturation. 7.02 Satellites Very Low Alt (<400 km) : YES Low Altitude (400-2000) : YES LAGEOS/LARES : YES GLONASS : YES Etalon : YES GNSS : YES Geosynchronous : NIGHT Moon : NO Ave. Pass Switch Time [s]: ~30 Average values for LAGEOS Single Shot RMS [mm]: 12 # of Obs per NP : 1000 Use of Semi-trains : NO # of Semi-train Tracks : n/a Range Gate Width [ns]: 200 - 2000 Beam Pointing Accuracy ["]: 2 Angle Encoder Resolution["]: 2 Min. Tracking Elev. [deg]: 25 Laser Polarization @emitter: Operation Months per Year : 12 Days per Week : 7 Hours per Day : 20 Staff per Shift : 1 System Shared With : NOTHING Time Allocated to SLR [%]: 100 Remotely Controllable : NO Tracking Restrictions Go/No-go flag : YES Satellite Verification : Date Verified : Maximum elevation : YES Satellite Verification : Date Verified : Pass segments : YES Satellite Verification : Date Verified : Schedule segments : Satellite Verification : Date Verified : Maximum laser power limit: Satellite Verification : Date Verified : Date First Applicable : 1982-01-01 HH:MM UT Date Last Applicable : Additional Information : KhZ laser : With no ND filters in the receive path : the daytime range-gate limit is of order : 600ns. However for low satellites and : considerable ND (up to 10^4), a range : gate of 2000ns is possible. : In practice a small range gate <500ns : for low satellites is possible and the : use of observer-entered time bias : corrections is used to level the : satellite O-C track satellite into the : range gate. : At night time a RG of up to 2000ns is : possible without saturation. Back to top 8. Calibration 8.01 Calibration Type : PRE+POST Target Location : EXTERNAL Target Type : see additional information Target Structure : BRICK BUILDING, see additional information Number of Targets : Target Distance(s) [m]: 120 Date Measured : 1993-06-09 Accuracy [mm]: 2-3 Verification : 4 other targets Return-Rate Controlled : YES Eye-Safe Method : ND filters plus partial mirror Additional Information : Mode of Operation : SINGLE PHOTON Calibration performed : 60 see additional information Single Shot RMS [mm]: 9 Edit Criterion 1st Chain : ITERATIVE 2.5 SIGMA Edit Criterion 2nd Chain : N.A. Application of Cal Data : LINEAR FIT Date Installed : 1982-01-01 Date Removed : 2018-02-05 Additional Information : Targets are made of two polished steel : sheets at right angles so as to : translate the beam horizontally from : the emitter telescope to the receiving : telescope. The 2 polished sheets are : mounted on brick building about 30 feet : above the ground, 120m from dome. The : HERT IGS system is co-mounted and offers : local stability monitoring. : A secondary target of 2 polished sheets is : mounted on standard concrete survey : pillar about 3 feet above the ground : at 600m. : We will always attempt to get calibrations : before and after satellite but when there : are several satellites back-to-back we will : calibrate before and after the batch. The : realtime system gives alarm messages should : the time since last calibration exceed 60 : minutes 8.03 Calibration Type : PRE+POST Target Location : EXTERNAL Target Type : see additional information Target Structure : BRICK BUILDING, see additional information Number of Targets : Target Distance(s) [m]: 120 Date Measured : 2017-04-26 Accuracy [mm]: 1-2 Verification : 2 other targets Return-Rate Controlled : YES Eye-Safe Method : ND filters plus partial mirror Additional Information : Mode of Operation : SINGLE PHOTON Calibration performed : 60 see additional information Single Shot RMS [mm]: 4 Edit Criterion 1st Chain : ITERATIVE 2.5 SIGMA Edit Criterion 2nd Chain : N.A. Application of Cal Data : LINEAR FIT Date Installed : 2018-02-05 Date Removed : Additional Information : Targets are made of two polished steel : sheets at right angles so as to : translate the beam horizontally from : the emitter telescope to the receiving : telescope. The 2 polished sheets are : mounted on brick building about 30 feet : above the ground, 120m from dome. The : HERT IGS system is co-mounted and offers : local stability monitoring. A new target : of similar construction but easier to : survey has been installed alongside the : existing external target and surveyed : in 2017. : The new target is adopted as primary : calibration as of 2018-02-05. Back to top 9. Time and Frequency Standards 9.01.01 Frequency Standard Type : Crystal Oscillator Model : 2110 Manufacturer : Austron Short Term Stab. [e-12]: 3 Long Term Stab. [e-12]: 1 Time Reference : GPS Synchronization : GPS Epoch Accuracy [ns]: 100 - 300 Date Installed : 1996-06-19 Date Removed : 2010-05-15 Additional Information : Epoch accuracy not measured explicitly. : A 10 MHz signal from the Datum GPS : receiver is feed to the Austron : Disciplined Frequency and that output : is used for our time interval frequency. 9.01.02 Frequency Standard Type : Active Hydrogen maser (AHM) Model : iMaser Manufacturer : T4Science Short Term Stab. [e-12]: 0.003 Long Term Stab. [e-12]: 0.001 Time Reference : GPS Synchronization : N/A Epoch Accuracy [ns]: 50 Date Installed : 2010-05-15 Date Removed : Additional Information : A 10 MHz signal from the AHM is fed to : the event timer and used as a very : stable source of time interval frequency. : A 1pps signal from the AHM is fed to the : event timer in order to generate LR epochs. : AHM drift is monitored relative to : UTC (GPS) and as a result LR epochs are : never allowed to drift relative to UTC(GPS) : by more than ~30ns but greatly benefit from : being independent of the ~20ns steering : events in the GPS timescale. : The AHM also drives the SGF IGS : receiver HERS. 9.02.01 GNSS Timing Rcvr Model : 9390-52133 Manufacturer : Datum Date Installed : 1995-01-01 Date Removed : 2018-12-05 Additional Information : 9.02.02 GNSS Timing Rcvr Model : S650 Manufacturer : Microsemi Date Installed : 2018-12-05 Date Removed : Additional Information : 9.03.01 One-way System Calibration Date performed : Direction Calibrated : Additional Information : Back to top 10. Preprocessing Information 10.01 On-site NP Generation : YES Data Screening : Orbit solution (SOLVE) + Gaussian fit Return-Rate Rejection : above 20% return rate Edit Criterion 1st Chain : 3.0 SIGMA Edit Criterion 2nd Chain : N.A. Upload interval : after each pass Date First Applicable : 1982-01-01 HH:MM UT Date Last Applicable : Additional Information : Back to top 11. Aircraft Detection 11.01 Detection Type : RADAR Manufacturer/Provider : Automatic Laser Shutoff : Alarms Recorded : Hazard Distance [km]: Date Installed : 1984-01-01 Date Removed : Additional Information : RADAR interfaced to LR control s/w and : automatically interrupts laser on detection : of aircraft within ~2 degrees of laser : direction. : Observer always on the observing platform : when ranging to satellites 11.02 Detection Type : Aircraft ADS-B receiver Manufacturer/Provider : Automatic Laser Shutoff : Alarms Recorded : Hazard Distance [km]: Date Installed : 2013-01-01 Date Removed : Additional Information : Aircraft locations in alt-az are computed : and displayed for the observer in ltime : Audible warning sounds when any aircraft : is predicted to pass close to direction of : laser Observer always on the observing : platform when ranging to satellites Back to top 12. Meteorological Instrumentation 12.01.01 Pressure Sensor Model : DPI 141 Manufacturer : Druck Recording Interval : EVERY 5 MINUTES Accuracy [mbar]: 0.15 Height Diff to SRP [m]: 0 Distance from SRP [m]: Date Installed : 1999-06-29 HH:MM UT Calibration Interval : see below Date Removed : Additional Information : Pressures continuously compared with : results from second Druck and with local : mercury and UK Met Office barometers 12.02.01 Temp Sensor Model : HMP 140 Manufacturer : Vaisala Recording Interval : EVERY 5 MINUTES Accuracy [deg C]: 0.1 Date Installed : 1997-07-04 HH:MM UT Calibration Interval : see below Date Removed : 2001-12-18 HH:MM UT Additional Information : Temperatures continuously compared with : results from another temperature sensor 12.02.02 Temp Sensor Model : MP103A-T7-W4W Manufacturer : Rotronics Recording Interval : EVERY 5 MINUTES Accuracy [deg C]: 0.1 Date Installed : 2001-12-18 HH:MM UT Calibration Interval : see below Date Removed : 2010-09-07 HH:MM UT Additional Information : Temperatures continuously compared with : results from another temperature sensor 12.02.03 Temp Sensor Model : MP103A-T7-W4W Manufacturer : Rotronics Recording Interval : EVERY 5 MINUTES Accuracy [deg C]: 0.1 Date Installed : 2010-09-07 HH:MM UT Calibration Interval : see below Date Removed : Additional Information : Temperatures continuously compared with : results from another temperature sensor. : Upgrade of previous model. 12.03.01 Humidity Sensor Model : HMP 140 Manufacturer : Vaisala Recording Interval : EVERY 5 MINUTES Accuracy [% rel h]: 5 Date Installed : 1996-06-19 HH:MM UT Calibration Interval : see below Date Removed : 2001-12-18 HH:MM UT Additional Information : Relative humidities continuously compared : with results from another device 12.03.02 Humidity Sensor Model : MP103A-T7-W4W Manufacturer : Rotronics Recording Interval : EVERY 5 MINUTES Accuracy [% rel h]: 1.5 Date Installed : 2001-12-18 HH:MM UT Calibration Interval : see below Date Removed : 2010-09-07 HH:MM UT Additional Information : Relative humidities continuously compared : with results from another device 12.03.03 Humidity Sensor Model : MP103A-T7-W4W Manufacturer : Rotronics Recording Interval : EVERY 5 MINUTES Accuracy [% rel h]: 1.5 Date Installed : 2010-09-07 HH:MM UT Calibration Interval : see below Date Removed : Additional Information : Relative humidities continuously compared : with results from another device. : Upgrade of previous model. Back to top 13. Local Ties, Eccentricities, and Collocation Information 13.01 Collocated Permanent Geodetic Systems 13.01.01.01 GNSS : IGS+EUREF Date Installed : 1992-07-29 Date Removed : Additional Info : HERS 13.01.01.02 GNSS : IGS+EUREF Date Installed : 2003-03-01 Date Removed : Additional Info : HERT 13.01.02.01 DORIS : NO Date Installed : Date Removed : Additional Info : 13.01.03.01 PRARE : YES Date Installed : 2005-06-01 Date Removed : 2005-11-01 Additional Info : PRARE System owned by UK Proudman : Oceanography Lab installed for 6 months : prior to shipping to South Atlantic 13.01.04.01 VLBI : NO Date Installed : Date Removed : Additional Info : 13.01.05.01 Gravimeter : YES Date Installed : 2006-10-19 Date Removed : Additional Info : Absolute Gravimeter manufactured by Micro-g : solutions, FG-5 229. Installed in basement : of SGF below ground level to the south : east of the SLR and to the south and below : the HERS GNSS receiver. : British Ordinance Survey positions for four : position studs measured to allow for three : visiting gravimeters to be run alongside the : SGF 229 unit. : Gravimeter room is constantly dehumidified : and temperature controlled Hum~55% : temp~22degC Routine Operations began 2007 : November. : Nominally in use for 24hrs once per week. : Upgraded to FG5-X in early 2013. 13.01.06.01 Other SLR : Date Installed : Date Removed : Additional Info : 13.02.01.01 Local Ties from the SRP to Other Monuments or Systems on Site Monument Name : HERS Instrumentation Type : GPS+GLONASS Instrumentation Status : PERMANENT DOMES Number : 13212M007 CDP Number : Differential Components (ITRS) dx [m]: 6.4992 +- 0.001 dy [m]: 10.2707 +- 0.001 dz [m]: -3.9410 +- 0.001 Date Measured : 2008-06-15 Determined by : IGN, France Date Installed : 1998-07-01 Date Removed : Additional Information : IGS code for the GPS is HERS. The IGN major : re-measurement gave up to 6mm changes from : the original UK OS tie-results of 1992 13.02.02.01 Local Ties from the SRP to Other Monuments or Systems on Site Monument Name : HERT Instrumentation Type : GPS+GLONASS (realtime stream) Instrumentation Status : PERMANENT DOMES Number : 13212M010 CDP Number : Differential Components (ITRS) dx [m]: -2.6863 +- 0.001 dy [m]: -124.8209 +- 0.001 dz [m]: 13.0074 +- 0.001 Date Measured : 2008-06-15 Determined by : IGN, France Date Installed : 2003-03-01 Date Removed : Additional Information : IGS code for the GPS is HERT. The IGN major : re-measurements gave up to 15mm changes : from the previous 2002 GPS campaign results 13.02.03.01 Local Ties from the SRP to Other Monuments or Systems on Site Monument Name : Absolute Gravimeter PIER 1 Instrumentation Type : FG-5 Instrumentation Status : FG-5 to be moved around piers DOMES Number : CDP Number : Differential Components (ITRS) dx [m]: 10.2216 +- 0.002 dy [m]: 8.8863 +- 0.005 dz [m]: -22.4002 +- 0.002 Date Measured : 2006-07-DD Determined by : British Ordinance Survey Date Installed : 2006-10-19 Date Removed : Additional Information : 13.02.04.01 Local Ties from the SRP to Other Monuments or Systems on Site Monument Name : Absolute Gravimeter PIER 2 Instrumentation Type : FG-5 Instrumentation Status : FG-5 to be moved around piers DOMES Number : CDP Number : Differential Components (ITRS) dx [m]: dy [m]: dz [m]: Date Measured : 2006-MM-DD Determined by : British Ordinance Survey Date Installed : 2006-10-19 Date Removed : Additional Information : 13.02.05.01 Local Ties from the SRP to Other Monuments or Systems on Site Monument Name : Absolute Gravimeter PIER 3 Instrumentation Type : FG-5 Instrumentation Status : FG-5 to be moved around piers DOMES Number : CDP Number : Differential Components (ITRS) dx [m]: dy [m]: dz [m]: Date Measured : 2006-MM-DD Determined by : British Ordinance Survey Date Installed : 2006-10-19 Date Removed : Additional Information : 13.02.06.01 Local Ties from the SRP to Other Monuments or Systems on Site Monument Name : Absolute Gravimeter PIER 4 Instrumentation Type : FG-5 Instrumentation Status : FG-5 to be moved around piers DOMES Number : CDP Number : Differential Components (ITRS) dx [m]: dy [m]: dz [m]: Date Measured : 2006-MM-DD Determined by : British Ordinance Survey Date Installed : 2006-10-19 Date Removed : Additional Information : 13.03.01.01 Eccentricities Between Other Monuments on Site From: Monument Name : DOMES Number : CDP Number : To: Monument Name : DOMES Number : CDP Number : Differential Components (ITRS) dx [m]: dy [m]: dz [m]: Date Measured : Determined by : Additional Information : Back to top 14. Local Events Possibly Affecting Computed Position 14.01 Date : Event : Additional Information : Back to top 15. On-Site, Point of Contact Agency Information Agency : Natural Environment Research Council Mailing Address : NERC Space Geodesy Facility : Herstmonceux Castle : Hailsham : East Sussex BN27 1RN Website : sgf.rgo.ac.uk Primary Contact Contact Name : Robert Sherwood Telephone (primary) : +44 (0)1323 833888 Telephone (secondary) : Fax : E-mail : rshe@bgs.ac.uk Secondary Contact Contact Name : Matthew Wilkinson Telephone (primary) : +44 (0)1323 833888 Telephone (secondary) : Fax : E-mail : matwi@bgs.ac.uk Tertiary Contact Contact Name : Telephone (primary) : Telephone (secondary) : Fax : E-mail : Additional Information : Back to top 16. Responsible Agency (if different from 15.) Agency : Natural Environment Research Council, : British Geological Survey Mailing Address : Director of Earth Hazards and Observatories : British Geological Survey, : West Mains Road, Edinburgh EH9 3LA Primary Contact Contact Name : Dr David Kerridge Telephone (primary) : +44 131 650 0220 Telephone (secondary) : Fax : E-mail : djk@bgs.ac.uk Secondary Contact Contact Name : Telephone (primary) : Telephone (secondary) : Fax : E-mail : Additional Information : Back to top 17. More Information URL for More Information : http://sgf.rgo.ac.uk/ Hardcopy on File Site Map : YES Site Diagram : YES Horizon Mask : NO Monument Description : NO Site Pictures : YES Additional Information : Back to top
- NASA Official: Frank Lemoine
- Web Curator: Lori J. Tyahla
- Contact Us
- Last modified date: Oct 4, 2024
- Privacy Policy & Important Notices