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Greenbelt (NGSLR): Site Log
Instructions and Update Site Log
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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) : Julie Horvath
Preparer E-mail : julie.horvath@honeywell.com
Date Prepared : 2014-10-19
Report Type : UPDATE
Format Version : 1.0
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1. Identification of the Ranging System Reference Point (SRP)
Site Name : NGSLR
IERS DOMES Number : 40451M114
CDP Pad ID : 7125
Subnetwork : NASA
Description : MONUMENT
Monument Description : STANDARD NASA DISK EPOXIED INTO CONCRETE
Monument Inscription : 7125
Mark Description : DIMPLE WITH CONCENTRIC CIRCLE
Date Installed : 1985
Date Removed : (yyyy-mm-dd)
Geologic Characteristic : CRETACEOUS SAND AND GRAVEL
Additional Information : (multiple lines)
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2. Site Location Information
City or Town : Greenbelt
State or Province : Maryland
Country : USA
Tectonic Plate : NORTH AMERICAN
Approximate Position
X coordinate [m]: 1130745.549
Y coordinate [m]: -4831368.033
Z coordinate [m]: 3994077.168
Latitude [deg]: 39.0202694 N
Longitude [deg]: 283.1723048 E
Elevation [m]: 18.496
Additional Information : (multiple lines)
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3. General System Information
3.01 System Name : NGSLR
4-Character Code : GO1L
CDP System Number : 93
CDP Occupation Number : 1
Eccentricity to SRP (if Not Identical With SRP)
North [m]: -0.081 m +- 0.0005 m
East [m]: -2.814 m +- 0.0005 m
Up [m]: +3.695 m +- 0.0005 m
Date Measured : 2012-10-01
Date Installed : 2002-10-15
Date Removed : (yyyy-mm-dd)
Additional Information : (multiple lines)
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4. Telescope Information
4.01 Receiving Telescope Type : CASSEGRAIN
Aperture [m]: 0.40
Mount : AZ-EL
Xmitting Telescope Type : CASSEGRAIN
Aperture [m]: 0.40
Tracking Camera Type : CCD
Model : CCC1390H Day/Night, WDR, High Resolution
Manufacturer : Pelco
Field of View [deg]: 17 degrees
Minimum Magnitude [mag]: 3.8
Transmit/Receive Path : COMMON COUDE
Transmit/Receive Switch : PASSIVE POLARIZING
Max Slew Rate Az [deg/s]: 20
Max Slew Rate El [deg/s]: 20
Max Used Tracking Rate Az : 5 deg/sec
Max Used Tracking Rate El : 5 deg/sec
Telescope Shelter : DOME
Daylight Filter Type : SPECTRAL FILTER
Dayl. Filt. Bandwidth [nm]: 0.2
Adjustable Attenuation : TRANSMIT & RECEIVE 0-3 OD T, 0-4 OD R
Transmit Efficiency : 0.5
Receive Efficiency : 0.5
Date Installed : 2002-10-15
Date Removed : (yyyy-mm-dd)
Additional Information : (multiple lines)
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5. Laser System Information
5.01 Laser Type : ND:YAG
Number of Amplifiers : 1
Primary Wavelength [nm]: 1064
Primary Maximum Energy [mJ]: 5.6
Secondary Wavelength [nm]: 532
Secondary Max. Energy [mJ]: 2.8
Xmit Energy Adjustable : YES
Pulse Width (FWHM) [ps]: 50
Max. Repetition Rate [Hz]: 2 khz
Fullw. Beam Divergence ["]: 4 in to 12 in
Final Beam Diameter [m]: 0.357
Eyesafe : NO
Eyesafe Standard : ANSI Z136.1, ANSI Z136.6
Date Installed : 2012-08-27
Date Removed : (yyyy-mm-dd)
Additional Information : (multiple lines)
5.02 Laser Type : ND:YAG
Number of Amplifiers : 1
Primary Wavelength [nm]: 1064
Primary Maximum Energy [mJ]: 50
Secondary Wavelength [nm]: 532
Secondary Max. Energy [mJ]: 40
Xmit Energy Adjustable : yes
Pulse Width (FWHM) [ns]: <8.0
Max. Repetition Rate [Hz]: 28
Fullw. Beam Divergence [mrad]: <1.6
Final Beam Diameter [mm]: >6.5
Eyesafe : NO
Eyesafe Standard : ANSI Z136.1, ANSI Z136.6
Date Installed : 2008
Date Removed : 2014-09-30
Additional Information : This laser was used for LRO only
: The LR-LRO project ended on 2014-09-30
: The beam diameter # is directly out of the laser
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6. Receiver System
6.01.01 Primary Chain
Wavelength [nm]: 532
Detector Type : MCP
Manufacturer : Hamamatsu
Model : R5916U-64
Quantum Efficiency [%]: 43
Nominal Gain : 2.0E+5
Rise Time [ps]: 178
Jitter (Single PE)[ps]: 124
Field of View ["]: 10" to 40"
Date Installed : 2012-02-08
Date Removed : (yyyy-mm-dd)
Signal Processing : CFD
Manufacturer : Tennelec
Model : TC454
Date Installed : 2010-03-01
Date Removed : (yyyy-mm-dd)
Amplitude Measurement : NO
Return-rate Controlled: NOT YET
Mode of Operation : SINGLE to MULTI-PHOTON
Time of Flight Observ. : EVENT TIMER
Manufacturer : HTSI
Model : 002
Resolution [ps]: <2 ps
Precision [ps]: 30
Date Installed : 2002-02-01
Date Removed : (yyyy-mm-dd)
Additional Information : (multiple lines)
6.02.01 Secondary Chain
Wavelength [nm]: N/A
Detector Type : (PM/MCP/SPAD/etc))
Manufacturer :
Model :
Quantum Efficiency [%]:
Nominal Gain :
Rise Time [ps]:
Jitter (Single PE)[ps]:
Field of View ["]: (minimum-maximum or fixed value)
Date Installed : (yyyy-mm-dd)
Date Removed : (yyyy-mm-dd)
Signal Processing : (CFD/PEAK/etc)
Manufacturer :
Model :
Date Installed : (yyyy-mm-dd)
Date Removed : (yyyy-mm-dd)
Amplitude Measurement : (YES/NO)
Return-rate Controlled: (YES/NO)
Mode of Operation : (MULTI/SINGLE/FEW PHOTON/DON'T KNOW)
Time of Flight Observ. : (INTERVAL/EVENT/STREAK CAMERA/etc)
Manufacturer :
Model :
Resolution [ps]:
Precision [ps]:
Date Installed : (yyyy-mm-dd)
Date Removed : (yyyy-mm-dd)
Additional Information : (multiple lines)
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7. Tracking Capabilities
7.01 Satellites
Very Low Alt (<400 km) : YES
Low Altitude (400-2000) : YES
Lageos : YES
GLONASS : YES
Etalon : YES
GPS : NOT YET
Moon : YES (LRO, not LLR)
Avge Pass Switch Time [s]: N/A
Average values for Lageos
Single Shot RMS [mm]: 45
# of Obs per NP : 100-5000
Use of Semi-trains : NO
# of Semi-train Tracks : N/A
Range Gate Width [ns]: 600 ns
Beam Pointing Accuracy ["]: 1
Angle Encoder Resolution["]: 0.3
Min. Tracking Elev. [deg]: 20
Operation
Months per Year : N/A (not yet operational)
Days per Week :
Hours per Day :
Staff per Shift : 1
System Shared With :
Time Allocated to SLR [%]:
Remotely Controllable : NO
Date First Applicable : 2010-12-06 17:00 UT
Date Last Applicable : (yyyy-mm-dd hh:mm UT)
Additional Information : (multiple lines)
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8. Calibration
8.01 Calibration Type : PRE+POST
Target Location : EXTERNAL
Target Type : CORNER CUBE
Target Structure : CONCRETE PIER
Target Distance [m]: 146.283
Date Measured : 2012-10-01
Accuracy (mm) [mm]: +/- 1.0 mm
Verification : first order survey and ranging to multiple ground targets
Return-rate Controlled : YES
Mode of Operation : SINGLE PHOTON
Average Cal Interval [min]: 5
Single Shot RMS [mm]: 30
Edit Criterion 1st Chain : ITERATIVE 3.0 SIGMA
Edit Criterion 2nd Chain : N/A
Application of Cal Data : AVERAGE
Date Installed : 2002-10
Date Removed : (yyyy-mm-dd)
Additional Information : (multiple lines)
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9. Time and Frequency Standards
9.01.01 Frequency Standard Type : GPS Steered Clock with Rubidium Oscillator
Model : XL-DC
Manufacturer : TrueTime (now Microsemi)
Short Term Stab. [e-12]: 0.1 Sec=n/a, 1.0 Sec=40, 10.0 Sec=n/a, 100.0 Sec=n/a, 1000.0 Sec=4
Long Term Stab. [e-12]: 1.0 per day (while XL-DC is locked to GPS satellites)
Time Reference : USNO via GPS
Synchronization : GPS
Epoch Accuracy [ns]: +/- 150
Date Installed : 2002-10-15
Date Removed : n/a
Additional Information : UTC-USNO <40 ns rms (150 ns peak)
9.01.02 Frequency Standard Type : Maser
Model : NR
Manufacturer : Johns Hopkins APL
Short Term Stab. [e-12]: 0.1 Sec=3, 1.0 Sec=0.4, 10.0 Sec=0.05, 100.0 Sec=0.006, 1000.0 Sec=0.002
Long Term Stab. [e-12]: < 0.05 per day
Time Reference : USNO
Synchronization : GPS
Epoch Accuracy [ns]: n/a
Date Installed : 2010-10-16
Date Removed : 2012-04-02
Additional Information : 2004-04-29 installed at VLBI
: The Maser unit was used from 2010 through 2012, however it was
: not used continuously due to multiple stability concerns.
: Dates for timing configuration changes are available upon request.
9.01.03 Frequency Standard Type : Cesium
Model : 4310B
Manufacturer : Symmetricom
Short Term Stab. [e-12]: 0.1 Sec=n/a, 1.0 Sec=12, 10.0 Sec=8.5, 100.0 Sec=2.7, 1000.0 Sec=0.85
Long Term Stab. [e-12]: 0.05 per day
Time Reference : USNO
Synchronization : GPS
Epoch Accuracy [ns]: n/a
Date Installed : 2010-04-02
Date Removed : 2012-07-28
Additional Information : Cesium unit failed on 2012-07-28
: The Cesium unit Symmetricom 4310B was used from 2010 through 2012,
: however it was not used continuously due to multiple failures.
: Dates for timing configuration changes are available upon request.
9.01.04 Frequency Standard Type : Active Hydrogen Maser
Model : MHM 2010 (Part # 75001-106)
Manufacturer : Symmetricom (now Microsemi)
Short Term Stab. [e-12]: 0.1 Sec=n/a, 1.0 Sec=0.15, 10.0 Sec=0.02, 100.0 Sec=0.005, 1000.0 Sec=0.002
Long Term Stab. [e-12]: < 0.0002 per day (with internal auto-tuning)
Time Reference : n/a
Synchronization : n/a
Epoch Accuracy [ns]: n/a
Date Installed : 2012-07-28
Date Removed : n/a
Additional Information : Maser is located in the VLBI2010 electronics van
: Maser 10 MHz is sent to NGSLR via fiber optic cable
: Maser 10 MHz is used as frequency source only
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10. Preprocessing Information
10.01 On-site NP Generation : YES
Data Screening : CPF orbit + polynomial fit
Edit Criterion 1st Chain : ITERATIVE 3.0 SIGMA
Edit Criterion 2nd Chain : N/A
Upload interval : HOURLY
Date First Applicable : 2010-12-10
Date Last Applicable : (yyyy-mm-dd hh:mm UT)
Additional Information : Noise Filtering prior to Normal point generation
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11. Aircraft Detection
11.01 Detection Type : RADAR
Date Installed : 2007-05-31
Date Removed : (yyyy-mm-dd)
Additional Information : (multiple lines)
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12. Meteorological Instrumentation
12.01.01 Pressure Sensor Model : MET3
Manufacturer : Paroscientific
Recording Interval : Once / minute
Accuracy [mbar]: +/- 0.08
Height Diff to SRP [m]: unknown
Date Installed : 2002-09
Calibration Interval : BIYEARLY
Date Removed : 2013-03-20
Additional Information : Removed for the MET4 Installation
12.01.02 Pressure Sensor Model : MET4
Manufacturer : Paroscientific
Recording Interval : Once / minute
Accuracy [mbar]: +/- 0.08
Height Diff to SRP [m]: unknown
Date Installed : 2013-03-20
Calibration Interval : BIYEARLY
Date Removed : (yyyy-mm-dd hh:mm UT)
Additional Information : (multiple lines)
12.02.01 Temp Sensor Model : MET3
Manufacturer : Paroscientific
Recording Interval : Once / minute
Accuracy [deg C]: +/- 0.5
Date Installed : 2002-09
Calibration Interval : BIYEARLY
Date Removed : 2013-03-20
Additional Information : Removed for the MET4 Installation
12.02.02 Temp Sensor Model : MET4
Manufacturer : Paroscientific
Recording Interval : Once / minute
Accuracy [deg C]: +/- 0.5
Date Installed : 2013-03-20
Calibration Interval : BIYEARLY
Date Removed : (yyyy-mm-dd hh:mm UT)
Additional Information : (multiple lines)
12.03.01 Humidity Sensor Model : MET3
Manufacturer : Paroscientific
Recording Interval : Once / minute
Accuracy [% rel h]: +/- 2
Date Installed : 2002-09
Calibration Interval : BIYEARLY
Date Removed : 2013-03-20
Additional Information : Removed for the MET4 Installation
12.03.02 Humidity Sensor Model : MET4
Manufacturer : Paroscientific
Recording Interval : Once / minute
Accuracy [% rel h]: +/- 2
Date Installed : 2013-03-20
Calibration Interval : BIYEARLY
Date Removed : (yyyy-mm-dd hh:mm UT)
Additional Information : (multiple lines)
12.04.01 Wind Sensor Model : 05103
Manufacturer : Belfort/Young
Recording Interval [hms]: Once / minute
Accuracy []: +/- 0.3 m/s and +/- 3 deg
Date Installed : 2004-06-30
Calibration Interval : N/A
Date Removed : (yyyy-mm-dd hh:mm UT)
Additional Information : (multiple lines)
12.05.01 Precipitation Sensor Model : FD12P
Manufacturer : Vaisala
Recording Interval [hms]: Once / minute
Accuracy []: N/A
Date Installed : 2004-06-30
Calibration Interval : N/A
Date Removed : (yyyy-mm-dd hh:mm UT)
Additional Information : (multiple lines)
12.06.01 Cloud Cover Model : None
Manufacturer : Raytheon
Recording Interval [hms]: Once / minute
Accuracy []: N/A
Date Installed : 2006-06-30
Calibration Interval : N/A
Date Removed : (yyyy-mm-dd hh:mm UT)
Additional Information : Thermal Camera Model JENOPTIK VarioCAM
12.07.01 Star Camera Model : SBIG-402ME
Manufacturer : Santa Barbara Instrument Group (SBIG)
Recording Interval [hms]: When requested during starcal
Accuracy ["]: 0.3 arcsec (of centroid)
Date Installed : 2006-09-21
Calibration Interval : N/A
Date Removed : (yyyy-mm-dd hh:mm UT)
Additional Information : Field of view ['] 2 arcmin
: Minimum magnitude [mag] 6.0
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13. Local Ties, Eccentricities, and Collocation Information
13.01 Collocated Permanent Geodetic Systems
GPS : IGS
Date Installed : 1993-04-02
Date Removed : (yyyy-mm-dd)
Additional Information : (multiple lines)
GLONASS : IGS
Date Installed : 1998-08-28
Date Removed : (yyyy-mm-dd)
Additional Information : (multiple lines)
DORIS : IDS
Date Installed : 2000-06-29
Date Removed : (yyyy-mm-dd)
Additional Information : (multiple lines)
PRARE : NO
Date Installed : (yyyy-mm-dd)
Date Removed : (yyyy-mm-dd)
Additional Information : (multiple lines)
VLBI : IVS
Date Installed : 1993-04-01
Date Removed : (yyyy-mm-dd)
Additional Information : (multiple lines)
Gravimeter : NO
Date Installed : (yyyy-mm-dd)
Date Removed : (yyyy-mm-dd)
Additional Information : (multiple lines)
13.02.01 Local Ties from the SRP to Other Monuments or Systems on Site
Monument Name :
Instrumentation Type : (GPS/GLONASS/DORIS/PRARE/SLR/VLBI/NONE)
Instrumentation Status : (PERMANENT/MOBILE)
DOMES Number : (XXXXXXXXX)
CDP Number : (XXXX)
Differential Components (ITRS)
dx [m]: (m +- m)
dy [m]: (m +- m)
dz [m]: (m +- m)
Date Measured : (yyyy-mm-dd)
Determined by :
Date Installed : (yyyy-mm-dd)
Date Removed : (yyyy-mm-dd)
Additional Information : (multiple lines)
13.03.01 Eccentricities Between Other Monuments on Site
From: Monument Name : CDP Station 7125
DOMES Number : 40451M114
CDP Number : 7125
To: Monument Name : CDP Station 7105
DOMES Number : 40451M105
CDP Number :
Differential Components (ITRS)
dx [m]: -23.438 +- 0.002
dy [m]: 18.559 +- 0.002
dz [m]: 29.096 +- 0.002
Date Measured : 2012-10-01
Determined by : Strategic Services
Additional Information : For more information about
: contact Jan McGarry
: jan.f.mcgarry@nasa.gov
13.03.02 Eccentricities Between Other Monuments on Site
From: Monument Name : CDP Station 7125
DOMES Number : 40451M114
CDP Number : 7125
To: Monument Name : CDP Station 7108(93)
DOMES Number : 40451M125
CDP Number :
Differential Components (ITRS)
dx [m]: - 49.089 +- 0.002
dy [m]: -134.221 +- 0.002
dz [m]: -139.898 +- 0.002
Date Measured : 2008-08-01
Determined by : HTSI
Additional Information : For more information about
: contact Jan McGarry
: jan.f.mcgarry@nasa.gov
13.03.03 Eccentricities Between Other Monuments on Site
From: Monument Name : CDP Station 7125
DOMES Number : 40451M114
CDP Number : 7125
To: Monument Name : CDP Station GODE
DOMES Number : 40451M123
CDP Number :
Differential Components (ITRS)
dx [m]: - 28.195 +- 0.002
dy [m]: -114.467 +- 0.002
dz [m]: -123.253 +- 0.002
Date Measured : 2008-08-01
Determined by : HTSI
Additional Information : For more information about
: contact Jan McGarry
: jan.f.mcgarry@nasa.gov
13.03.04 Eccentricities Between Other Monuments on Site
From: Monument Name : CDP Station 7125
DOMES Number : 40451M114
CDP Number : 7125
To: Monument Name : CDP Station NGEOS
DOMES Number : 40451M110
CDP Number :
Differential Components (ITRS)
dx [m]: 14.430 +- 0.002
dy [m]: -45.428 +- 0.002
dz [m]: -59.347 +- 0.002
Date Measured : 2008-08-01
Determined by : HTSI
Additional Information : For more information about
: contact Jan McGarry
: jan.f.mcgarry@nasa.gov
13.03.04 Eccentricities Between Other Monuments on Site
From: Monument Name : CDP Station 7125
DOMES Number : 40451M114
CDP Number : 7125
To: Monument Name : CDP Station DORIS MK
DOMES Number :
CDP Number :
Differential Components (ITRS)
dx [m]: 34.472 +- 0.002
dy [m]: 23.496 +- 0.002
dz [m]: 16.299 +- 0.002
Date Measured : 2008-08-01
Determined by : HTSI
Additional Information : For more information about
: contact Jan McGarry
: jan.f.mcgarry@nasa.gov
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14. Local Events Possibly Affecting Computed Position
14.01 Date : (yyyy-mm-dd hh:mm UT)
Event : (EARTHQUAKE/CONSTRUCTION/etc)
Additional Information : (multiple lines)
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15. On-Site, Point of Contact Agency Information
Agency : NASA / GSFC
Mailing Address : Jan McGarry
: Code 694
: NASA Goddard Space Flight Center
: Greenbelt, MD 20771
Primary Contact
Contact Name : Jan McGarry
Telephone (primary) : 301-614-5867
Telephone (secondary) :
Fax :
E-mail : Jan.McGarry@nasa.gov
Secondary Contact
Contact Name : Howard Donovan
Telephone (primary) : 301-805-3985
Telephone (secondary) :
Fax :
E-mail : Howard.Donovan@Honeywell.com
Additional Information : (multiple lines)
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16. Responsible Agency (if different from 15.)
Agency : (multiple lines)
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)
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17. More Information
URL for More Information : (N.A.)
Hardcopy on File
Site Map : (YES/NO)
Site Diagram : (YES/NO)
Horizon Mask : (YES/NO)
Monument Description : (YES/NO)
Site Pictures : (YES/NO)
Additional Information : (multiple lines)
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