ILRS Site and System Information Form
      International Laser Ranging Service

 0.   Form

      Prepared by (Full Name)    : Yang Xuhai
      Preparer E-mail            : yyang@ntsc.ac.cn
      Date Prepared              : 2025-04-08
      Report Type                : UPDATE
      Site Log Format Version    : 2.0
      Site Log Revision          : 


 1.   Identification of the Ranging System Reference Point (SRP)

      Site Name                  : Xian
      IERS DOMES Number          : 
      CDP Pad ID                 : 7329
      Subnetwork                 : N.A.
      Description                : AZ EL INTERSECT
      Monument Description       : N.A.
      Monument Inscription       : N.A.
      Mark Description           : N.A.
      Date Installed             : 2023-11-24
      Date Removed               : 
      Geologic Characteristic    : BEDROCK
      Additional Information     : The site is located in northeast 


 2.   Site Location Information

      City or Town               : Xi`an
      State or Province          : Shaanxi
      Country                    : China
      Tectonic Plate             : Eurasian
      Local Time (UTC +/- hours) : 8
      Approximate Position
        X coordinate          [m]: -1735046.9
        Y coordinate          [m]: 4978437.1
        Z coordinate          [m]: 3579256.3
        Latitude            [deg]: 34.3517 N
        Longitude           [deg]: 109.2141 E
        Elevation             [m]: 940.297
      Survey Method              : GNSS CAMPAIGN
      Date Measured              : 2024-10-13
      Additional Information     : The site is located at the top of the 


 3.   General System Information

 3.01 System Name                : Xian
      4-Character Code           : ntsc
      CDP System Number          : 
      CDP Occupation Number      : 
      Eccentricity to SRP (if Not Identical With SRP)
        North                 [m]: N.A.
        East                  [m]: N.A.
        Up                    [m]: N.A.
        Date Measured            : N.A.
      Date Installed             : N.A.
      Date Removed               : N.A.
      Additional Information     : N.A.


 4.   Telescope Information

 4.01 Receiving Telescope Type   : CASSEGRAIN
        Aperture              [m]: 1.05
        Mount                    : AZ-EL
      Date Installed             : 2023-08-30
      Date Removed               : 
      Xmitting Telescope Type    : GALILEI
        Aperture              [m]: 0.2
      Date Installed             : 2023-08-30
      Date Removed               : 
      Tracking Camera Type       : CCD
        Model                    : 910H
        Manufacturer             : Watec/Japan
        Field of View       [deg]: 0.02
        Minimum Magnitude   [mag]: 13
      Date Installed             : 2023-08-30
      Date Removed               : 
      Transmit/Receive Path      : SEPARATE
      Transmit/Receive Switch    : NONE
      Max Slew Rate Az    [deg/s]: 10
      Max Slew Rate El    [deg/s]: 5
      Max Used Tracking Rate Az  : 4
      Max Used Tracking Rate El  : 1
      Telescope Shelter          : DOME
      Daylight Filter Type       : SPECTRAL FILTER
      Dayl. Filt. Bandwidth  [nm]: 0.2
      Adjustable Attenuation     : TRANSMIT
      Adjustable Field of View   : 
      Transmit Efficiency        : 0.7
      Receive Efficiency         : 0.8
      Date Installed             : 2023-08-30
      Date Removed               : 
      Additional Information     : 


 5.   Laser System Information

 5.01 Laser Type                 : ND:YAG
      Model                      : 
      Manufacturer               : China
      Number of Amplifiers       : 5
      Primary Wavelength     [nm]: 1064
      Primary Maximum Energy [mJ]: 20
      Secondary Wavelength   [nm]: 532
      Secondary Max. Energy  [mJ]: 12
      Xmit Energy Adjustable     : YES
        Additional Information   : 
      Pulse Width (FWHM)     [ps]: 25
      Max. Repetition Rate   [Hz]: 1000
      Fullw. Beam Divergence  ["]: 35
        Theoretical Beam Div     : N.A.
        Measured Beam Div        : N.A.
          Method Used            : N.A.
          Additional Information : N.A.
      Final Beam Diameter     [m]: 0.15
      Eyesafe                    : NO
      Eyesafe Standard           : N.A.
      Polarization on Exit       : N.A.
      Laser Fire Control         : CONTROLLED
      Laser Energy Monitor       : N.A.
      Start Diode Type           : Silicon
        Manufactorer             : 
        Model                    : 
        Quantum Efficiency    [%]: 
        Rise/Fall Time       [ps]: 500
        Date Installed           : 2023-09-14
        Date Removed             : 
        Signal Processing        : N.A.
          Manufacturer           : 
          Model                  : 
          Date Installed         : 
          Date Removed           : 
          Additional Information : 
      Date Installed             : 2023-09-14
      Date Removed               : 
      Additional Information     : 


 6.   Receiver System

 6.01.01 Primary Chain
         Wavelength          [nm]: 532
         Detector Type           : APD
           Manufacturer          : SHAO
           Model                 : Si-200um
           Quantum Efficiency [%]: 20
           Nominal Gain          : N.A.
           Rise Time         [ps]: 
           Jitter (Single PE)[ps]: 30
           Field of View Diam ["]: 60
           Date Installed        : 2023-09-20
           Date Removed          : 
         Amplifier Type          : N.A.
           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: NO
           Mode of Operation     : SINGLE Photon
           Additional Information: 
         Time of Flight Observ.  : Event Timer
           Manufacturer          : SHAO
           Model                 : 
           Resolution        [ps]: 1
           Precision         [ps]: 8
           Date Installed        : 2024-09-20
           Date Removed          : 
         Additional Information  : 

 6.02.01 Secondary Chain
         Wavelength          [nm]: N.A.
         Detector Type           : N.A.
           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]: N.A.
         Detector Type           : N.A.
           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)   : NO
        Low Altitude (400-2000)  : YES
        LAGEOS/LARES             : YES
        GLONASS                  : YES
        Etalon                   : YES
        GNSS                     : YES
        Geosynchronous           : YES
        Moon                     : NO
      Ave. Pass Switch Time   [s]: ~30
      Average values for LAGEOS
        Single Shot RMS      [mm]: 8
        # of Obs per NP          : 2000
        Use of Semi-trains       : NO
        # of Semi-train Tracks   : 
      Range Gate Width       [ns]: 10 - 10000
      Beam Pointing Accuracy  ["]: 3
      Angle Encoder Resolution["]: 0.01
      Min. Tracking Elev.   [deg]: 10
      Laser Polarization @emitter: N.A.
      Operation
        Months per Year          : 12
        Days per Week            : 7
        Hours per Day            : 6 - 12
        Staff per Shift          : 2
        System Shared With       : NO
        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      : 
      Date Last Applicable       : 
      Additional Information     : 


 8.   Calibration

 8.01 Calibration Type           : PRE+POST
      Target Location            : INTERNAL
      Target Type                : FLAT SURFACE
      Target Structure           : 
      Number of Targets          : 1
      Target Distance(s)      [m]: 3.088
        Date Measured            : 2024-10-17
        Accuracy             [mm]: 30
        Verification             : 
      Return-Rate Controlled     : 
      Eye-Safe Method            : 
        Additional Information   : 
      Mode of Operation          : SINGLE/MULTI PHOTON
      Calibration performed      : HOUR
      Single Shot RMS        [mm]: 10
      Edit Criterion 1st Chain   : ITERATIVE 2.2 SIGMA
      Edit Criterion 2nd Chain   : N.A.
      Application of Cal Data    : 
      Date Installed             : 
      Date Removed               : 
      Additional Information     : 


 9.   Time and Frequency Standards

 9.01.01 Frequency Standard Type : Oven Controlled Crystal Oscillator
         Model                   : DNTS-9S
         Manufacturer            : 
         Short Term Stab.  [e-12]: 1
         Long Term Stab.   [e-12]: 5
         Time Reference          : GPS+GLONASS
         Synchronization         : GNSS
         Epoch Accuracy      [ns]: 20
         Date Installed          : 2024-08-29
         Date Removed            : 
         Additional Information  : 

 9.02.01 GNSS Timing Rcvr Model  : DNTS-9S
         Manufacturer            : 
         Date Installed          : 2024-08-29
         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             : CPF+POLYNAMIAL
      Return-Rate Rejection      : N.A.
      Edit Criterion 1st Chain   : 2.2 SIGMA
      Edit Criterion 2nd Chain   : N.A.
      Upload interval            : DAILY
      Date First Applicable      : 
      Date Last Applicable       : 
      Additional Information     : 


11.   Aircraft Detection

11.01 Detection Type             : ADS-B
      Manufacturer/Provider      : 
      Automatic Laser Shutoff    : 
      Alarms Recorded            : 
      Hazard Distance        [km]: 
      Date Installed             : 2024-08-29
      Date Removed               : 
      Additional Information     : 


12.   Meteorological Instrumentation

12.01.01 Pressure Sensor Model   : PC-5
         Manufacturer            : China
         Recording Interval      : 2 min
         Accuracy          [mbar]: 0.3
         Height Diff to SRP   [m]: 4
         Distance from SRP    [m]: 7
         Date Installed          : 2024-09-13 02:00 UT
         Calibration Interval    : 
         Date Removed            : 
         Additional Information  : 

12.02.01 Temp Sensor Model       : PC-5
         Manufacturer            : China
         Recording Interval      : 2 min
         Accuracy         [deg C]: 0.1
         Date Installed          : 
         Calibration Interval    : 
         Date Removed            : 
         Additional Information  : 

12.03.01 Humidity Sensor Model   : PC-5
         Manufacturer            : China
         Recording Interval      : 2 min
         Accuracy       [% rel h]: 2
         Date Installed          : 
         Calibration Interval    : 
         Date Removed            : 
         Additional Information  : 


13.   Local Ties, Eccentricities, and Collocation Information

13.01 Collocated Permanent Geodetic Systems

13.01.01.01 GNSS                 : NO
            Date Installed       : 
            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           : NO
            Date Installed       : 
            Date Removed         : 
            Additional Info      : 
13.01.06.01 Other SLR            : NO
            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  : 


14.   Local Events Possibly Affecting Computed Position

14.01 Date                       : 
      Event                      : 
      Additional Information     : 


15.   On-Site, Point of Contact Agency Information

      Agency                     : National Time 
      Mailing Address            : Shuyuan East Road No.3, Lintong,Xi`an,
      Website                    : http://www.ntsc.ac.cn/
      Primary Contact
        Contact Name             : Yang Xuhai
        Telephone (primary)      : +86-029-83890424
        Telephone (secondary)    : 
        Fax                      : +86-029-83890196
        E-mail                   : yyang@ntsc.ac.cn
      Secondary Contact
        Contact Name             : Li Weichao
        Telephone (primary)      : +86-029-83893326
        Telephone (secondary)    : 
        Fax                      : +86-029-83890196
        E-mail                   : liwc@ntsc.ac.cn
      Tertiary Contact
        Contact Name             : Wang Xiao
        Telephone (primary)      : +86-029-83893326
        Telephone (secondary)    : 
        Fax                      : +86-029-83890196
        E-mail                   : wangxiao@ntsc.ac.cn
      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   : http://www.ntsc.ac.cn/
      Hardcopy on File
        Site Map                 : NO
        Site Diagram             : NO
        Horizon Mask             : NO
        Monument Description     : NO
        Site Pictures            : NO
      Additional Information     :