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Site Log - Beijing, China (7249)
ILRS Site and System Information Form
International Laser Ranging Service
0. Form
Prepared by (Full Name) : Shushan Fang
Preparer E-mail : susan@casm.ac.cn
Date Prepared : 2025-11-20
Report Type : UPDATE
Site Log Format Version : 2.0
Site Log Revision :
1. Identification of the Ranging System Reference Point (SRP)
Site Name : Beijing SLR Station
IERS DOMES Number : 21601S004
CDP Pad ID : 7249
Subnetwork : WPLTN
Description : AZ EL INTERSECT
Monument Description : PILLAR
Monument Inscription : N.A.
Mark Description : N.A.
Date Installed : 1988-12-31
Date Removed :
Geologic Characteristic : SANDSTONES
Additional Information :
2. Site Location Information
City or Town : Fangshan district
State or Province : Beijing
Country : China
Tectonic Plate : Eurasian plate
Local Time (UTC +/- hours) : 8
Approximate Position
X coordinate [m]: -2148760.7559
Y coordinate [m]: 4426759.5583
Z coordinate [m]: 4044509.6074
Latitude [deg]: 39.6069 N
Longitude [deg]: 115.8920 E
Elevation [m]: 82.300
Survey Method : ITRF2014
Date Measured :
Additional Information :
3. General System Information
3.01 System Name : SLR Beijing
4-Character Code : beil
CDP System Number : 61
CDP Occupation Number : 02
Eccentricity to SRP (if Not Identical With SRP)
North [m]: 0.000 +- 0.000
East [m]: 0.000 +- 0.000
Up [m]: 0.000 +- 0.000
Date Measured : N.A.
Date Installed : 1988-12-31
Date Removed :
Additional Information :
4. Telescope Information
4.01 Receiving Telescope Type : CASSEGRAIN
Aperture [m]: 0.60
Mount : AZ-EL
Date Installed : 1988-12-31
Date Removed :
Xmitting Telescope Type : GALILEI
Aperture [m]: 0.16
Date Installed : 1988-12-31
Date Removed :
Tracking Camera Type : ICCD
Model : WAT-902H(just for CCD)
Manufacturer : SLR Beijing station
Field of View [deg]: 0.30
Minimum Magnitude [mag]: 13
Date Installed : 1988-12-31
Date Removed : 2016-05-30
Transmit/Receive Path : SEPARATE
Transmit/Receive Switch : NONE
Max Slew Rate Az [deg/s]: 15
Max Slew Rate El [deg/s]: 5
Max Used Tracking Rate Az : 15
Max Used Tracking Rate El : 5
Telescope Shelter : SEALED DOME
Daylight Filter Type : Andover/USA
Dayl. Filt. Bandwidth [nm]: 0.16
Adjustable Attenuation : RECEIVE
Adjustable Field of View :
Transmit Efficiency : 0.70
Receive Efficiency : 0.70
Date Installed : 1988-12-31
Date Removed :
Additional Information : The image intensifier of the ICCD
: was made in Kunming, China
4.02 Receiving Telescope Type : CASSEGRAIN
Aperture [m]: 0.60
Mount : AZ-EL
Date Installed : 1988-12-31
Date Removed :
Xmitting Telescope Type : GALILEI
Aperture [m]: 0.16
Date Installed : 1988-12-31
Date Removed :
Tracking Camera Type : CCD
Model : WAT-120N+
Manufacturer : Watec
Field of View [deg]: 0.30
Minimum Magnitude [mag]: 0.15
Date Installed : 2016-05-31
Date Removed :
Transmit/Receive Path : SEPARATE
Transmit/Receive Switch : NONE
Max Slew Rate Az [deg/s]: 15
Max Slew Rate El [deg/s]: 5
Max Used Tracking Rate Az : 15
Max Used Tracking Rate El : 5
Telescope Shelter : SEALED DOME
Daylight Filter Type : Barr/USA
Dayl. Filt. Bandwidth [nm]: 0.2
Adjustable Attenuation : RECEIVE
Adjustable Field of View : N
Transmit Efficiency : 0.70
Receive Efficiency : 0.70
Date Installed : 2016-05-31
Date Removed : 2023-04-19
Additional Information :
4.03 Receiving Telescope Type : CASSEGRAIN
Aperture [m]: 0.60
Mount : AZ-EL
Date Installed : 1988-12-31
Date Removed :
Xmitting Telescope Type : GALILEI
Aperture [m]: 0.16
Date Installed : 1988-12-31
Date Removed :
Tracking Camera Type : CMOS
Model : C13440-20U
Manufacturer : HAMAMATSU
Field of View [deg]: 0.30
Minimum Magnitude [mag]: 12
Date Installed : 2023-03-27
Date Removed :
Transmit/Receive Path : SEPARATE
Transmit/Receive Switch : NONE
Max Slew Rate Az [deg/s]: 15
Max Slew Rate El [deg/s]: 5
Max Used Tracking Rate Az : 15
Max Used Tracking Rate El : 5
Telescope Shelter : SEALED DOME
Daylight Filter Type : SPECTRAL FILTER
Dayl. Filt. Bandwidth [nm]:
Adjustable Attenuation : RECEIVE
Adjustable Field of View : NO
Transmit Efficiency : 0.70
Receive Efficiency : 0.70
Date Installed : 2023-04-20
Date Removed :
Additional Information :
5. Laser System Information
5.01 Laser Type : ND:YAG
Model :
Manufacturer :
Number of Amplifiers : 3
Primary Wavelength [nm]: 1064
Primary Maximum Energy [mJ]: 1
Secondary Wavelength [nm]: 532
Secondary Max. Energy [mJ]: 30
Xmit Energy Adjustable : NO
Additional Information :
Pulse Width (FWHM) [ps]: 200
Max. Repetition Rate [Hz]: 10
Fullw. Beam Divergence ["]: 0 - 200
Theoretical Beam Div :
Measured Beam Div :
Method Used :
Additional Information :
Final Beam Diameter [m]: 0.01
Eyesafe : NO
Eyesafe Standard : N.A.
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 : 1990-05-20
Date Removed : 2010-07-27
Additional Information :
5.02 Laser Type : ND:VAN
Model :
Manufacturer :
Number of Amplifiers : 2
Primary Wavelength [nm]: 1064
Primary Maximum Energy [mJ]: 2.28
Secondary Wavelength [nm]: 532
Secondary Max. Energy [mJ]: 1.45
Xmit Energy Adjustable : NO
Additional Information :
Pulse Width (FWHM) [ps]: 10.8
Max. Repetition Rate [Hz]: 2000
Fullw. Beam Divergence ["]: 0 - 200
Theoretical Beam Div :
Measured Beam Div :
Method Used :
Additional Information :
Final Beam Diameter [m]: 0.06
Eyesafe : NO
Eyesafe Standard : N.A.
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 : 2010-07-12
Date Removed : 2012-01-31
Additional Information :
5.03 Laser Type : ND:YVO
Model :
Manufacturer :
Number of Amplifiers : 2
Primary Wavelength [nm]: 1064
Primary Maximum Energy [mJ]: N.A.
Secondary Wavelength [nm]: 532
Secondary Max. Energy [mJ]: 1.5
Xmit Energy Adjustable : NO
Additional Information :
Pulse Width (FWHM) [ps]: 10
Max. Repetition Rate [Hz]: 1000
Fullw. Beam Divergence ["]: 103
Theoretical Beam Div :
Measured Beam Div :
Method Used :
Additional Information :
Final Beam Diameter [m]: 0.05
Eyesafe : NO
Eyesafe Standard : N.A.
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 : 2012-01-03
Date Removed : 2016-05-10
Additional Information :
5.04 Laser Type : ND:YVO
Model :
Manufacturer :
Number of Amplifiers : 2
Primary Wavelength [nm]: 1064
Primary Maximum Energy [mJ]:
Secondary Wavelength [nm]: 532
Secondary Max. Energy [mJ]: 1.2
Xmit Energy Adjustable : NO
Additional Information :
Pulse Width (FWHM) [ps]: 10
Max. Repetition Rate [Hz]: 2000
Fullw. Beam Divergence ["]: 103
Theoretical Beam Div :
Measured Beam Div :
Method Used :
Additional Information :
Final Beam Diameter [m]: 0.02
Eyesafe : NO
Eyesafe Standard : N.A.
Polarization on Exit :
Laser Fire Control :
Laser Energy Monitor : OCCASSIONAL
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 : 2016-05-01
Date Removed : 2019-01-19
Additional Information :
5.05 Laser Type : ND:YVO
Model : IC470
Manufacturer : HighQLaser Production GmbH
Number of Amplifiers : 0
Primary Wavelength [nm]: 1064
Primary Maximum Energy [mJ]: 2.0
Secondary Wavelength [nm]: 532
Secondary Max. Energy [mJ]: 1.0
Xmit Energy Adjustable : YES
Additional Information :
Pulse Width (FWHM) [ps]: 10
Max. Repetition Rate [Hz]: 1000
Fullw. Beam Divergence ["]: 103
Theoretical Beam Div : 103
Measured Beam Div :
Method Used :
Additional Information :
Final Beam Diameter [m]: 0.002
Eyesafe : NO
Eyesafe Standard : N.A.
Polarization on Exit :
Laser Fire Control : CONTROLLED
Laser Energy Monitor : OCCASSIONAL
Start Diode Type : GT106
Manufactorer :
Model :
Quantum Efficiency [%]:
Rise/Fall Time [ps]:
Date Installed :
Date Removed :
Signal Processing :
Manufacturer :
Model :
Date Installed :
Date Removed :
Additional Information :
Date Installed : 2019-01-20
Date Removed :
Additional Information :
5.06 Laser Type : ND:YAG
Model :
Manufacturer : Daheng Optics
Number of Amplifiers : 1
Primary Wavelength [nm]: 1064
Primary Maximum Energy [mJ]: N.A.
Secondary Wavelength [nm]: 532
Secondary Max. Energy [mJ]: 2.5
Xmit Energy Adjustable : YES
Additional Information :
Pulse Width (FWHM) [ps]: 25
Max. Repetition Rate [Hz]: 1000
Fullw. Beam Divergence ["]: 103
Theoretical Beam Div : 103
Measured Beam Div :
Method Used :
Additional Information :
Final Beam Diameter [m]: 0.01
Eyesafe : NO
Eyesafe Standard : N.A.
Polarization on Exit :
Laser Fire Control : CONTROLLED
Laser Energy Monitor : OCCASSIONAL
Start Diode Type : GT106
Manufactorer :
Model :
Quantum Efficiency [%]:
Rise/Fall Time [ps]:
Date Installed :
Date Removed :
Signal Processing :
Manufacturer :
Model :
Date Installed :
Date Removed :
Additional Information :
Date Installed : 2021-12-20
Date Removed : 2024-09-23
Additional Information :
5.07 Laser Type : ND:YAG
Model :
Manufacturer : Daheng Optics
Number of Amplifiers : 1
Primary Wavelength [nm]: 1064
Primary Maximum Energy [mJ]: N.A.
Secondary Wavelength [nm]: 532
Secondary Max. Energy [mJ]: 2.5
Xmit Energy Adjustable : YES
Additional Information :
Pulse Width (FWHM) [ps]: 25
Max. Repetition Rate [Hz]: 2000
Fullw. Beam Divergence ["]: 103
Theoretical Beam Div : 103
Measured Beam Div :
Method Used :
Additional Information :
Final Beam Diameter [m]: 0.01
Eyesafe : NO
Eyesafe Standard : N.A.
Polarization on Exit :
Laser Fire Control : CONTROLLED
Laser Energy Monitor : OCCASSIONAL
Start Diode Type : GT106
Manufactorer :
Model :
Quantum Efficiency [%]:
Rise/Fall Time [ps]:
Date Installed :
Date Removed :
Signal Processing :
Manufacturer :
Model :
Date Installed :
Date Removed :
Additional Information :
Date Installed : 2024-09-23
Date Removed :
Additional Information :
6. Receiver System
6.01.01 Primary Chain
Wavelength [nm]: 532
Detector Type : C-SPAD
Manufacturer : Czech Technical University + Graz
Model : SN980610/403
Quantum Efficiency [%]: 20
Nominal Gain :
Rise Time [ps]: 100
Jitter (Single PE)[ps]: 22
Field of View Diam ["]:
Date Installed : 1998-12-26
Date Removed :
Amplifier Type :
Manufacturer :
Model :
Gain :
Bandwidth :
Date Installed :
Date Removed :
Additional Information:
Signal Processing : CFD
Manufacturer : TENILEC
Model : TC-454
Date Installed : 1994-08-20
Date Removed : 2010-07-31
Amplitude Measurement : NO
Return-Rate Controlled: NO
Mode of Operation : MULTI PHOTON
Additional Information:
Time of Flight Observ. : EVENT
Manufacturer : Latvia
Model : A032-Event Timer
Resolution [ps]: 1
Precision [ps]: 10
Date Installed : 2010-07-12
Date Removed :
Additional Information :
6.02.01 Secondary Chain
Wavelength [nm]: 532
Detector Type : CSPAD
Manufacturer : Czech Technical University + Graz
Model : SN980610/403
Quantum Efficiency [%]: 20
Nominal Gain :
Rise Time [ps]: 10
Jitter (Single PE)[ps]: 22
Field of View Diam ["]:
Date Installed : 1998-12-26
Date Removed :
Amplifier Type :
Manufacturer :
Model :
Gain :
Bandwidth :
Date Installed :
Date Removed :
Additional Information:
Signal Processing : CFD
Manufacturer : Graz
Model : NO
Date Installed : 2010-08-01
Date Removed :
Amplitude Measurement : NO
Return-Rate Controlled: NO
Mode of Operation : MULTI
Additional Information:
Time of Flight Observ. : EVENT
Manufacturer : Latvia
Model : A032-Event Timer
Resolution [ps]: 1
Precision [ps]: 10
Date Installed : 2010-07-12
Date Removed : 2021-12-20
Additional Information :
6.02.02 Secondary Chain
Wavelength [nm]: 532
Detector Type : CSPAD
Manufacturer : Czech Technical University + Graz
Model :
Quantum Efficiency [%]: 20
Nominal Gain :
Rise Time [ps]: 10
Jitter (Single PE)[ps]: 22
Field of View Diam ["]:
Date Installed :
Date Removed :
Amplifier Type :
Manufacturer :
Model :
Gain :
Bandwidth :
Date Installed :
Date Removed :
Additional Information:
Signal Processing : CFD
Manufacturer : Graz
Model :
Date Installed : 2010-08-01
Date Removed :
Amplitude Measurement : NO
Return-Rate Controlled: NO
Mode of Operation : MULTI
Additional Information:
Time of Flight Observ. : EVENT
Manufacturer : Latvian University
Model : A033-ET/USB
Resolution [ps]: 1
Precision [ps]: 5
Date Installed : 2021-12-20
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 :
7. Tracking Capabilities
7.01 Satellites
Very Low Alt (<400 km) : NIGHT
Low Altitude (400-2000) : NIGHT
LAGEOS/LARES : NIGHT
GLONASS : NIGHT
Etalon : NIGHT
GNSS : NIGHT
Geosynchronous : NIGHT
Moon : NO
Ave. Pass Switch Time [s]: 30
Average values for LAGEOS
Single Shot RMS [mm]: 15
# of Obs per NP : 50
Use of Semi-trains : NO
# of Semi-train Tracks : N.A.
Range Gate Width [ns]: 10 - 10000
Beam Pointing Accuracy ["]: 5
Angle Encoder Resolution["]: 1
Min. Tracking Elev. [deg]: 0
Laser Polarization @emitter:
Operation
Months per Year : 12
Days per Week : 7
Hours per Day : 12
Staff per Shift : 1
System Shared With : NOTHING
Time Allocated to SLR [%]: 100
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 : 1998-12-26 00:00 UT
Date Last Applicable :
Additional Information :
8. Calibration
8.01 Calibration Type : POST
Target Location : EXTERNAL
Target Type : FLAT SURFACE
Target Structure : METAL POLE
Number of Targets : 1
Target Distance(s) [m]: 188.725
Date Measured : 2002-03-25
Accuracy [mm]: 1.0
Verification : 3 other targets
Return-Rate Controlled : YES
Eye-Safe Method :
Additional Information :
Mode of Operation : MULTI PHOTON
Calibration performed : 60
Single Shot RMS [mm]: 8
Edit Criterion 1st Chain : ITERATIVE 2.5 SIGMA
Edit Criterion 2nd Chain : N.A.
Application of Cal Data : AVERAGE
Date Installed : 1998-10-21
Date Removed :
Additional Information :
9. Time and Frequency Standards
9.01.01 Frequency Standard Type : QUARTZ
Model : 58503A
Manufacturer : HP company
Short Term Stab. [e-12]: 5
Long Term Stab. [e-12]: 1
Time Reference : GPS
Synchronization : GPS
Epoch Accuracy [ns]: 100
Date Installed : 1998-12-26
Date Removed :
Additional Information :
9.01.02 Frequency Standard Type : Oven Controlled Crystal Oscillator
Model : Meridian Precision GPS TimeBase
Manufacturer : EndRun
Short Term Stab. [e-12]: 0.1
Long Term Stab. [e-12]: 0.1
Time Reference : GPS
Synchronization : GPS
Epoch Accuracy [ns]: 100
Date Installed : 2021-10-13
Date Removed :
Additional Information :
9.02.01 GNSS Timing Rcvr Model : HP58503A
Manufacturer : HP company
Date Installed : 1998-12-26
Date Removed :
Additional Information :
9.03.01 One-way System Calibration
Date performed :
Direction Calibrated :
Additional Information :
10. Preprocessing Information
10.01 On-site NP Generation : YES
Data Screening : POLYNOMIAL
Return-Rate Rejection :
Edit Criterion 1st Chain : 2.5 SIGMA
Edit Criterion 2nd Chain : N.A.
Upload interval : AFTER EACH SHIFT
Date First Applicable : 1994-12-30 HH:MM UT
Date Last Applicable :
Additional Information :
11. Aircraft Detection
11.01 Detection Type : MOUNT OBSERVER
Manufacturer/Provider :
Automatic Laser Shutoff :
Alarms Recorded :
Hazard Distance [km]:
Date Installed :
Date Removed :
Additional Information :
12. Meteorological Instrumentation
12.01.01 Pressure Sensor Model : PTU-200
Manufacturer : Vaisala, Finland
Recording Interval : PER PASS
Accuracy [mbar]: 0.5
Height Diff to SRP [m]: -1.2
Distance from SRP [m]:
Date Installed : 1998-06-30 HH:MM UT
Calibration Interval : Every 2 years
Date Removed :
Additional Information :
12.02.01 Temp Sensor Model : HMP-450
Manufacturer : Vaisala, Finland
Recording Interval : Per Pass
Accuracy [deg C]: 0.1
Date Installed : 1998-06-30 HH:MM UT
Calibration Interval : Every 2 years
Date Removed :
Additional Information :
12.03.01 Humidity Sensor Model : HMP-450
Manufacturer : Vaisala, Finland
Recording Interval : Per Pass
Accuracy [% rel h]: 2.0
Date Installed : 1998-06-30 HH:MM UT
Calibration Interval : Every 2 years
Date Removed :
Additional Information :
13. Local Ties, Eccentricities, and Collocation Information
13.01 Collocated Permanent Geodetic Systems
13.01.01.01 GNSS : IGS
Date Installed : 1995-09-20
Date Removed :
Additional Info :
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 : ABSOLUTE
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 : BJFS
Instrumentation Type : GNSS(Trimble NetR8)
Instrumentation Status : PERMANENT
DOMES Number : 21601M001
CDP Number :
Differential Components (ITRS)
dx [m]: -16.5167 +- 0.0001
dy [m]: 118.3174 +- 0.0001
dz [m]: -146.2830 +- 0.000
Date Measured : 2011-10-20
Determined by : The Chinese Academy of Surveying and Mapping
Date Installed : 1995-09-15
Date Removed :
Additional Information :
14. Local Events Possibly Affecting Computed Position
14.01 Date :
Event :
Additional Information :
15. On-Site, Point of Contact Agency Information
Agency : Chinese Academy of Surveying and mapping
Mailing Address : 28 Lianhuachi Road
: 100830 Beijing,China
Website : www.casm.ac.cn
Primary Contact
Contact Name : Shushan Fang
Telephone (primary) : 010-63880586
Telephone (secondary) :
Fax :
E-mail : susan@casm.ac.cn
Secondary Contact
Contact Name : Jinzhong Mi
Telephone (primary) : 010-63880708
Telephone (secondary) :
Fax :
E-mail : goldheal@casm.ac.cn
Tertiary Contact
Contact Name :
Telephone (primary) :
Telephone (secondary) :
Fax :
E-mail :
Additional Information :
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 :
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 :