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Stafford: 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) : Jake Griffiths
Preparer E-mail : jake.griffiths@nrl.navy.mil
Date Prepared : 2020-03-12
Report Type : UPDATE
Site Log Format Version : 2.0
Site Log Revision :
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1. Identification of the Ranging System Reference Point (SRP)
Site Name : NRL OPTICAL TEST FACILITY
IERS DOMES Number : 49654M001
CDP Pad ID : 7865
Subnetwork : US DOD
Description : MONUMENT IN TELESCOPE PIER
Monument Description : BRASS MARKER CIRCLE WITH DIVOT
Monument Inscription : NONE
Mark Description : NONE
Date Installed : 2002-08-01
Date Removed :
Geologic Characteristic : CLAY/SAND
Additional Information : THIS IS A MARKER ON TELESCOPE FOUNDATION,
: Epoch 2015:232 and tied to ITRF2008 using
: GPS
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2. Site Location Information
City or Town : STAFFORD
State or Province : VIRGINIA
Country : UNITED STATES
Tectonic Plate : NORTH AMERICAN
Local Time (UTC +/- hours) :
Approximate Position
X coordinate [m]: 1092770.4387
Y coordinate [m]: -4877220.3267
Z coordinate [m]: 3948976.2350
Latitude [deg]: 38.4992167 N
Longitude [deg]: 282.628892 E
Elevation [m]: 23.92248
Survey Method : TRILATERATION+GNSS
Date Measured : 2015-08-20
Additional Information :
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3. General System Information
3.01 System Name : NRL OPTICAL TEST FACILITY
4-Character Code : STAL
CDP System Number : 86
CDP Occupation Number : 01
Eccentricity to SRP (if Not Identical With SRP)
North [m]: -1.2022 +- 0.0007
East [m]: -0.0102 +- 0.0007
Up [m]: 4.0545 +- 0.0007
Date Measured : 2015-08-20
Date Installed : 2002-08-01
Date Removed :
Additional Information : AXIS INTERSECTION IN X,Y,Z is
: 1092771.2861, -4877224.1556,
: 3948977.81812
: Local re-survey and analysis completed
: in September, 2016.
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4. Telescope Information
4.01 Receiving Telescope Type : CASSEGRAIN
Aperture [m]: 1
Mount : AZ-EL
Date Installed : 2002-08-01
Date Removed :
Xmitting Telescope Type : CASSEGRAIN
Aperture [m]: 1
Date Installed : 2002-08-01
Date Removed :
Tracking Camera Type : ICCD
Model : VARIOUS
Manufacturer : VARIOUS
Field of View [deg]: 0.4011
Minimum Magnitude [mag]: 12
Date Installed : 2003-MM-DD
Date Removed :
Transmit/Receive Path : COMMON COUDE
Transmit/Receive Switch : POLARIZER
Max Slew Rate Az [deg/s]: 20
Max Slew Rate El [deg/s]: 10
Max Used Tracking Rate Az :
Max Used Tracking Rate El :
Telescope Shelter : DOME; Observa-Dome with bi-parting shutter
Daylight Filter Type : SPECTRAL FILTER
Dayl. Filt. Bandwidth [nm]: 4
Adjustable Attenuation : BOTH
Adjustable Field of View : NO
Transmit Efficiency : 0.8
Receive Efficiency : 0.8
Date Installed : 2002-08-01
Date Removed :
Additional Information :
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5. Laser System Information
5.01 Laser Type : ND:YAG
Model :
Manufacturer :
Number of Amplifiers : 3
Primary Wavelength [nm]: 1064
Primary Maximum Energy [mJ]: 100
Secondary Wavelength [nm]:
Secondary Max. Energy [mJ]:
Xmit Energy Adjustable : YES
Additional Information :
Pulse Width (FWHM) [ps]: 190
Max. Repetition Rate [Hz]: 10
Fullw. Beam Divergence ["]: 16.5 - 206.3
Theoretical Beam Div : 20.6
Measured Beam Div : 24.8
Method Used : ILRS DIVERGENCE PROCEDURE
Additional Information :
Final Beam Diameter [m]: 1
Eyesafe : NO
Eyesafe Standard : ANSI Z136.1 & Z136.6
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 : 2002-08-01
Date Removed : N.A.
Additional Information :
5.02 Laser Type : ND:YAG
Model : PicoBlade with autoNLO module
Manufacturer : Lumentum
Number of Amplifiers : 4
Primary Wavelength [nm]: 1064
Primary Maximum Energy [mJ]: 0.9
Secondary Wavelength [nm]: 532
Secondary Max. Energy [mJ]: 0.75
Xmit Energy Adjustable : YES
Additional Information : FREQUENCY DOUBLED OUTPUT OF LASER 5.03
Pulse Width (FWHM) [ps]: 34
Max. Repetition Rate [Hz]: 2000
Fullw. Beam Divergence ["]: 20.6
Theoretical Beam Div :
Measured Beam Div :
Method Used :
Additional Information :
Final Beam Diameter [m]: 0.707
Eyesafe : YES
Eyesafe Standard : ANSI 136.1
Polarization on Exit : CIRCULAR
Laser Fire Control : SYNCRONIZED TO UTC
Laser Energy Monitor : CONTINUOUS
Start Diode Type : Silicon
Manufactorer : PESO Consulting
Model : Optical Trigger Device v2014.01
Quantum Efficiency [%]:
Rise/Fall Time [ps]: <150 (Fall Time)
Date Installed : 2018-08-23
Date Removed :
Signal Processing : FIXER THRESHOLD DISCRIM.; PULSE FORMING ELEC.
Manufacturer :
Model :
Date Installed :
Date Removed :
Additional Information :
Date Installed : 2018-08-23
Date Removed :
Additional Information :
5.03 Laser Type : ND:YAG
Model : PicoBlade with autoNLO module
Manufacturer : Lumentum
Number of Amplifiers : 4
Primary Wavelength [nm]: 1064
Primary Maximum Energy [mJ]: 0.9
Secondary Wavelength [nm]:
Secondary Max. Energy [mJ]:
Xmit Energy Adjustable : YES
Additional Information :
Pulse Width (FWHM) [ps]: 28
Max. Repetition Rate [Hz]: 2000
Fullw. Beam Divergence ["]: 20.6
Theoretical Beam Div :
Measured Beam Div :
Method Used :
Additional Information :
Final Beam Diameter [m]: 0.707
Eyesafe : YES
Eyesafe Standard : ANSI 136.1
Polarization on Exit : CIRCULAR
Laser Fire Control : SYNCRONIZED TO UTC
Laser Energy Monitor : CONTINUOUS
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 : 2018-08-23
Date Removed :
Additional Information :
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6. Receiver System
6.01.01 Primary Chain
Wavelength [nm]: 1064
Detector Type : Si APD
Manufacturer : VARIOUS
Model : VARIOUS
Quantum Efficiency [%]:
Nominal Gain :
Rise Time [ps]:
Jitter (Single PE)[ps]:
Field of View Diam ["]: 16.5 - 206.3
Date Installed : 2002-08-01
Date Removed :
Amplifier Type :
Manufacturer :
Model :
Gain :
Bandwidth :
Date Installed :
Date Removed :
Additional Information:
Signal Processing : CFD
Manufacturer : TENNELEC
Model : 454
Date Installed : 2002-08-01
Date Removed :
Amplitude Measurement : NO
Return-Rate Controlled: NO
Mode of Operation : MULTI
Additional Information:
Time of Flight Observ. : INTERVAL
Manufacturer : STANFORD
Model : 620
Resolution [ps]:
Precision [ps]:
Date Installed : 2002-08-01
Date Removed : 2009-06-15
Additional Information : HP 5370A USED FOR CALIBRATION
6.01.02 Primary Chain
Wavelength [nm]: 1064
Detector Type : Si APD
Manufacturer : VARIOUS
Model : VARIOUS
Quantum Efficiency [%]:
Nominal Gain :
Rise Time [ps]:
Jitter (Single PE)[ps]:
Field of View Diam ["]: 16.5 - 206.3
Date Installed : 2002-08-01
Date Removed :
Amplifier Type :
Manufacturer :
Model :
Gain :
Bandwidth :
Date Installed :
Date Removed :
Additional Information:
Signal Processing : CFD
Manufacturer : TENNELEC
Model : 454
Date Installed : 2002-08-01
Date Removed :
Amplitude Measurement : NO
Return-Rate Controlled: NO
Mode of Operation : MULTI
Additional Information:
Time of Flight Observ. : EVENT
Manufacturer : HTSI
Model :
Resolution [ps]:
Precision [ps]:
Date Installed : 2009-06-15
Date Removed :
Additional Information : HP 5370A USED FOR CALIBRATION
6.02.01 Secondary Chain
Wavelength [nm]: 532
Detector Type : CSPAD
Manufacturer : PESO Consulting
Model : #0450
Quantum Efficiency [%]: 20
Nominal Gain :
Rise Time [ps]:
Jitter (Single PE)[ps]:
Field of View Diam ["]:
Date Installed : 2018-08-23
Date Removed :
Amplifier Type :
Manufacturer :
Model :
Gain :
Bandwidth :
Date Installed :
Date Removed :
Additional Information:
Signal Processing : Time walk compensated
Manufacturer : PESO Consulting
Model :
Date Installed :
Date Removed :
Amplitude Measurement :
Return-Rate Controlled: YES
Mode of Operation : MULTI
Additional Information:
Time of Flight Observ. : EVENT
Manufacturer : PESO Consulting
Model : NPET 1CH01-112015-0017
: NPET 1CH01-112015-0018
Resolution [ps]: 0.16
Precision [ps]: 0.9
Date Installed : 2018-08-23
Date Removed : 2020-02-05
Additional Information :
6.02.01 Secondary Chain
Wavelength [nm]: 532
Detector Type : CSPAD
Manufacturer : PESO Consulting
Model : #0450
Quantum Efficiency [%]: 20
Nominal Gain :
Rise Time [ps]:
Jitter (Single PE)[ps]:
Field of View Diam ["]:
Date Installed : 2018-08-23
Date Removed :
Amplifier Type :
Manufacturer :
Model :
Gain :
Bandwidth :
Date Installed :
Date Removed :
Additional Information:
Signal Processing : Time walk compensated
Manufacturer : PESO Consulting
Model :
Date Installed :
Date Removed :
Amplitude Measurement :
Return-Rate Controlled: YES
Mode of Operation : MULTI
Additional Information:
Time of Flight Observ. : EVENT
Manufacturer : PESO Consulting
Model : NPET 2CH02-0818-001
Resolution [ps]: 0.16
Precision [ps]: 0.9
Date Installed : 2020-02-05
Date Removed :
Additional Information :
6.03.01 Tertiary Chain
Wavelength [nm]: 1064
Detector Type : CSPAD
Manufacturer : PESO Consulting
Model : #0451
Quantum Efficiency [%]: 0.1
Nominal Gain :
Rise Time [ps]:
Jitter (Single PE)[ps]:
Field of View Diam ["]:
Date Installed : 2020-02-05
Date Removed :
Amplifier Type :
Manufacturer :
Model :
Gain :
Bandwidth :
Date Installed :
Date Removed :
Additional Information:
Signal Processing : Time walk compensated @532nm
Manufacturer : PESO Consulting
Model :
Date Installed :
Date Removed :
Amplitude Measurement :
Return-Rate Controlled: YES
Mode of Operation : MULTI
Additional Information:
Time of Flight Observ. : EVENT
Manufacturer : PESO Consulting
Model : NPET 2CH02-1119-0005
Resolution [ps]: 0.120
Precision [ps]: 0.9
Date Installed : 2020-02-05
Date Removed :
Additional Information :
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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 :
Moon : YES
Ave. Pass Switch Time [s]:
Average values for LAGEOS
Single Shot RMS [mm]:
# of Obs per NP :
Use of Semi-trains : NO
# of Semi-train Tracks : NA
Range Gate Width [ns]: 100 - 10000
Beam Pointing Accuracy ["]: 0.1
Angle Encoder Resolution["]: 0.005
Min. Tracking Elev. [deg]: 12
Laser Polarization @emitter:
OperationIntermittent
Months per Year : 12
Days per Week : 7
Hours per Day : 24
Staff per Shift : 3 - 5
System Shared With : R&D
Time Allocated to SLR [%]: 25
Remotely Controllable : NO
Tracking Restrictions
Go/No-go flag :
Satellite Verification :
Date Verified :
Maximum elevation :
Satellite Verification :
Date Verified :
Pass segments :
Satellite Verification :
Date Verified :
Schedule segments :
Satellite Verification :
Date Verified :
Maximum laser power limit:
Satellite Verification :
Date Verified :
Date First Applicable : 2002-08-01 HH:MM UT
Date Last Applicable :
Additional Information :
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8. Calibration
8.01 Calibration Type : HOURLY
Target Location : EXTERNAL
Target Type : CORNER CUBE
Target Structure : PIERS OF VARIOUS CONSTRUCTION
Number of Targets : 5
Target Distance(s) [m]: 13.7595, 34.8803, 36.6595, 38.6958, 410.8936
Date Measured : 2018-08-20
Accuracy [mm]: 0.7
Verification : (multiple lines)
Return-Rate Controlled : YES
Eye-Safe Method : ND FILTERS
Additional Information :
Mode of Operation : MULTI PHOTON
Calibration performed : HOUR
Single Shot RMS [mm]: 4
Edit Criterion 1st Chain : ITERATIVE 3.0 SIGMA
Edit Criterion 2nd Chain : ITERATIVE 3.0 SIGMA
Application of Cal Data : LINEAR FIT
Date Installed : 2002-08-01
Date Removed :
Additional Information :
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9. Time and Frequency Standards
9.01.01 Frequency Standard Type : GPS-DISCIPLINED RUBIDIUM
Model :
Manufacturer : BALL EFFRATOM
Short Term Stab. [e-12]:
Long Term Stab. [e-12]:
Time Reference : USNO
Synchronization : GPS
Epoch Accuracy [ns]:
Date Installed : 2002-08-01
Date Removed : 2016-11-02
Additional Information : Internal GPS receiver failed,
: switched to backup
9.01.02 Frequency Standard Type : GPS-DISCIPLINED RUBIDIUM
Model :
Manufacturer : BALL EFFRATOM
Short Term Stab. [e-12]:
Long Term Stab. [e-12]:
Time Reference : USNO
Synchronization : GPS
Epoch Accuracy [ns]:
Date Installed : 2016-11-02
Date Removed :
Additional Information :
9.01.03 Frequency Standard Type : H-MASER
Model : MHM 2010 LPN
Manufacturer : Microsemi
Short Term Stab. [e-12]: 0.08
Long Term Stab. [e-12]: 0.0015
Time Reference : USNO
Synchronization : TWSTT
Epoch Accuracy [ns]: 1
Date Installed : 2018-01-11
Date Removed :
Additional Information :
9.02.01 GNSS Timing Rcvr Model : DATUM 635 & 638 CARDS ON IRIG B
Manufacturer :
Date Installed : 2002-08-01
Date Removed :
Additional Information :
9.03.01 One-way System Calibration
Date performed :
Direction Calibrated :
Additional Information :
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10. Preprocessing Information
10.01 On-site NP Generation : YES
Data Screening : IRV+POLYNOMIAL
Return-Rate Rejection :
Edit Criterion 1st Chain : ITERATIVE 3.0 SIGMA
Edit Criterion 2nd Chain :
Upload interval : AFTER EACH SHIFT
Date First Applicable : 2002-08-01 HH:MM UT
Date Last Applicable :
Additional Information :
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11. Aircraft Detection
11.01 Detection Type : RADAR, OBSERVER
Manufacturer/Provider : HONEYWELL TECHNOLOGY SOLUTIONS INC.
Automatic Laser Shutoff : YES
Alarms Recorded :
Hazard Distance [km]: 41.8
Date Installed : 2002-08-01
Date Removed : 2019-06-07
Additional Information :
11.02 Detection Type : RADAR, OBSERVER
Manufacturer/Provider : KBR
Automatic Laser Shutoff : YES
Alarms Recorded : YES
Hazard Distance [km]: 41.8
Date Installed : 2019-06-11
Date Removed :
Additional Information :
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12. Meteorological Instrumentation
12.01.01 Pressure Sensor Model : MET3A
Manufacturer : PAROSCIENTIFIC
Recording Interval : 00:00:10
Accuracy [mbar]: 0.1
Height Diff to SRP [m]: TBD
Distance from SRP [m]:
Date Installed : 2002-08-01 HH:MM UT
Calibration Interval : YEARLY
Date Removed : 2015-09-23 HH:MM UT
Additional Information : RECALIBRATED Sep 2002
12.01.02 Pressure Sensor Model : MET4A-1
Manufacturer : PAROSCIENTIFIC
Recording Interval : 00:00:10
Accuracy [mbar]: 0.1
Height Diff to SRP [m]: TBD
Distance from SRP [m]:
Date Installed : 2015-09-23 HH:MM UT
Calibration Interval : 2015-09-23
Date Removed :
Additional Information : New
12.01.03 Pressure Sensor Model : MET4A-1
Manufacturer : PAROSCIENTIFIC
Recording Interval : 00:00:10
Accuracy [mbar]: 0.1
Height Diff to SRP [m]: TBD
Distance from SRP [m]:
Date Installed : 2019-06-03 HH:MM UT
Calibration Interval : 2019-03-28
Date Removed :
Additional Information : REFURBISHED AND UPGRADED MET3A
12.02.01 Temp Sensor Model : SAME AS ABOVE MET3A
Manufacturer : PAROSCIENTIFIC
Recording Interval : 00:00:10
Accuracy [deg C]:
Date Installed :
Calibration Interval :
Date Removed :
Additional Information :
12.02.02 Temp Sensor Model : SAME AS ABOVE MET4A-1
Manufacturer : PAROSCIENTIFIC
Recording Interval : 00:00:10
Accuracy [deg C]:
Date Installed :
Calibration Interval :
Date Removed :
Additional Information :
12.02.03 Temp Sensor Model : SAME AS ABOVE MET4A-1
Manufacturer : PAROSCIENTIFIC
Recording Interval : 00:00:10
Accuracy [deg C]:
Date Installed :
Calibration Interval :
Date Removed :
Additional Information :
12.03.01 Humidity Sensor Model : SAME AS ABOVE MET 3A
Manufacturer : PAROSCIENTIFIC
Recording Interval : 00:00:10
Accuracy [% rel h]:
Date Installed :
Calibration Interval :
Date Removed :
Additional Information :
12.03.02 Humidity Sensor Model : SAME AS ABOVE MET4A-1
Manufacturer : PAROSCIENTIFIC
Recording Interval : 00:00:10
Accuracy [% rel h]:
Date Installed :
Calibration Interval :
Date Removed :
Additional Information :
12.03.03 Humidity Sensor Model : SAME AS ABOVE MET4A-1
Manufacturer : PAROSCIENTIFIC
Recording Interval : 00:00:10
Accuracy [% rel h]:
Date Installed :
Calibration Interval :
Date Removed :
Additional Information :
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13. Local Ties, Eccentricities, and Collocation Information
13.01 Collocated Permanent Geodetic Systems
13.01.01.01 GNSS : IGS
Date Installed : 2017-07-26
Date Removed :
Additional Info : MRC1
13.01.02.01 DORIS : NO
Date Installed :
Date Removed :
Additional Info :
13.01.03.01 PRARE : NO
Date Installed :
Date Removed :
Additional Info :
13.01.04.01 VLBI : NO
Date Installed :
Date Removed :
Additional Info :
13.01.05.01 Gravimeter : NO
Date Installed :
Date Removed :
Additional Info :
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 :
Instrumentation Type :
Instrumentation Status :
DOMES Number :
CDP Number :
Differential Components (ITRS)
dx [m]:
dy [m]:
dz [m]:
Date Measured :
Determined by :
Date Installed :
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 :
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14. Local Events Possibly Affecting Computed Position
14.01 Date : 2011-08-23 17:51 UT
Event : EARTHQUAKE
Additional Information : Magnitude 5.8 earthquake located
: at 37.936 N, 77.933 W
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15. On-Site, Point of Contact Agency Information
Agency : NAVAL RESEARCH LABORATORY
Mailing Address : 4555 OVERLOOK AVE SW, CODE 8123,
: WASHINGTON, DC 20375
Website :
Primary Contact
Contact Name : JAKE GRIFFITHS
Telephone (primary) : 202-404-3508
Telephone (secondary) : 765-413-6690
Fax : 202-404-1226
E-mail : JAKE.GRIFFITHS@NRL.NAVY.MIL
Secondary Contact
Contact Name : LINDA THOMAS
Telephone (primary) : 202-404-2062
Telephone (secondary) : 703-551-1875
Fax : 202-404-1226
E-mail : LINDA.THOMAS@NRL.NAVY.MIL
Tertiary Contact
Contact Name :
Telephone (primary) :
Telephone (secondary) :
Fax :
E-mail :
Additional Information :
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16. Responsible Agency (if different from 15.)
Agency :
Mailing Address :
Primary Contact
Contact Name :
Telephone (primary) :
Telephone (secondary) :
Fax :
E-mail :
Secondary Contact
Contact Name :
Telephone (primary) :
Telephone (secondary) :
Fax :
E-mail :
Additional Information :
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17. More Information
URL for More Information : N.A.
Hardcopy on File
Site Map : NO
Site Diagram : NO
Horizon Mask : NO
Monument Description : NO
Site Pictures : NO
Additional Information :
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- Web Curator: Lori J. Tyahla
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- Last modified date: Nov 5, 2024
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