ILRS Site and System Information Form
      International Laser Ranging Service

 0.   Form

      Prepared by (Full Name)    : Dr. Makram Ibrahim
      Preparer E-mail            : makram@nriag.sci.eg,
                                 : makikh@yahoo.com
      Date Prepared              : 2016-07-27
      Report Type                : UPDATE
      Site Log Format Version    : 2.0
      Site Log Revision          : 


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

      Site Name                  : Helwan SLR
      IERS DOMES Number          : 30101S001
      CDP Pad ID                 : 7831
      Subnetwork                 : EUROLAS
      Description                : AZ EL INTERSECT
      Monument Description       : N.A.
      Monument Inscription       : N.A.
      Mark Description           : N.A.
      Date Installed             : 1983-05-01
      Date Removed               : 
      Geologic Characteristic    : Sandstone
      Additional Information     : The system is operated in annual
                                 : Campaigns in cooperation with the Czech
                                 : Technical University in Prague 


 2.   Site Location Information

      City or Town               : Helwan - Cairo
      State or Province          : N.A.
      Country                    : Egypt
      Tectonic Plate             : Africa
      Local Time (UTC +/- hours) : 
      Approximate Position
        X coordinate          [m]: 4728297
        Y coordinate          [m]: 2879661
        Z coordinate          [m]: 3156862
        Latitude            [deg]: 29.8590 N
        Longitude           [deg]: 31.3427 E
        Elevation             [m]: 145.46
      Survey Method              : 
      Date Measured              : 
      Additional Information     : 


 3.   General System Information

 3.01 System Name                : HELLAS
      4-Character Code           : HLWL
      CDP System Number          : 46
      CDP Occupation Number      : 01
      Eccentricity to SRP (if Not Identical With SRP)
        North                 [m]: 
        East                  [m]: 
        Up                    [m]: 
        Date Measured            : 
      Date Installed             : 1983-05-01
      Date Removed               : 
      Additional Information     : (a new Laser Radar Control(LRC) will be 
                                 : installed at the Helwan SLR-STation.
                                 : This will keep the station in better 
                                 : effeciency)


 4.   Telescope Information

 4.01 Receiving Telescope Type   : Keplarian
        Aperture              [m]: 0.4
        Mount                    : AZ-EL
      Date Installed             : 
      Date Removed               : 
      Xmitting Telescope Type    : Gallieleo type, refracting 
        Aperture              [m]: 0.38
      Date Installed             : 
      Date Removed               : 
      Tracking Camera Type       : NONE
        Model                    : 
        Manufacturer             : 
        Field of View       [deg]: 
        Minimum Magnitude   [mag]: 
      Date Installed             : 
      Date Removed               : 
      Transmit/Receive Path      : SEPARATE
      Transmit/Receive Switch    : NONE
      Max Slew Rate Az    [deg/s]: 2
      Max Slew Rate El    [deg/s]: 2
      Max Used Tracking Rate Az  : 2
      Max Used Tracking Rate El  : 2
      Telescope Shelter          : ROLL-BACK ROOF
      Daylight Filter Type       : NONE
      Dayl. Filt. Bandwidth  [nm]: 
      Adjustable Attenuation     :  NO
      Adjustable Field of View   : 
      Transmit Efficiency        : 0.9
      Receive Efficiency         : 0.8
      Date Installed             : 1983-05-01
      Date Removed               : 
      Additional Information     : Receiving telescope has two positive 
                                 : lenses with a pinhole to focus.
                                 : The beam expanding telescope is of 
                                 : Gallieleo type, refracting, antireflection
                                 : coated. The beam is directed by the mount 
                                 : (flat) mirrors in a Coude path. The Coude 
                                 : path is used for transmitting only.
                                 : Transmit Efficiency: ~0.9
                                 : Receive Efficiency: ~0.8


 5.   Laser System Information

 5.01 Laser Type                 : ND:YAG
      Model                      : 
      Manufacturer               : 
      Number of Amplifiers       : 3
      Primary Wavelength     [nm]: 1064
      Primary Maximum Energy [mJ]: N.A.
      Secondary Wavelength   [nm]: 532
      Secondary Max. Energy  [mJ]: 80
      Xmit Energy Adjustable     : YES
        Additional Information   : 
      Pulse Width (FWHM)     [ps]: 20
      Max. Repetition Rate   [Hz]: 5
      Fullw. Beam Divergence  ["]: 60 - 180
        Theoretical Beam Div     : 
        Measured Beam Div        : 
          Method Used            : 
          Additional Information : 
      Final Beam Diameter     [m]: 0.25 
      Eyesafe                    : NO
      Eyesafe Standard           : 
      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             : 1983-05-01
      Date Removed               : 
      Additional Information     : The laser beam is expanded at the laser 
                                 : bench to its final diameter/divergence of
                                 : 25 mm, adjustable 0.5-3 arcminutes.
                                 : Primary Maximum Energy: not used for ranging


 6.   Receiver System

 6.01.01 Primary Chain
         Wavelength          [nm]: 532
         Detector Type           : PMT
           Manufacturer          : Hamamatsu
           Model                 : H 6533
           Quantum Efficiency [%]: 10
           Nominal Gain          : 5700000
           Rise Time         [ps]: 700
           Jitter (Single PE)[ps]: 30
           Field of View Diam ["]: 120
           Date Installed        : 1998-05-15
           Date Removed          : 
         Amplifier Type          : 
           Manufacturer          : 
           Model                 : 
           Gain                  : 
           Bandwidth             : 
           Date Installed        : 
           Date Removed          : 
           Additional Information: 
         Signal Processing       : CFD 
           Manufacturer          : Tennelec
           Model                 : TC454
           Date Installed        : 1998-05-15
           Date Removed          : 
           Amplitude Measurement : NO
           Return-Rate Controlled: YES
           Mode of Operation     : Single to Multi Photons
           Additional Information: 
         Time of Flight Observ.  : INTERVAL
           Manufacturer          : Stanford
           Model                 : 620
           Resolution        [ps]: 4
           Precision         [ps]: 30
           Date Installed        : 1999-05-15
           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  : 


 7.   Tracking Capabilities

 7.01 Satellites
        Very Low Alt (<400 km)   : NIGHT
        Low Altitude (400-2000)  : NIGHT
        LAGEOS/LARES             : NIGHT
        GLONASS                  : NO
        Etalon                   : NO
        GNSS                     : NO
        Geosynchronous           : 
        Moon                     : NO
      Ave. Pass Switch Time   [s]: 
      Average values for LAGEOS
        Single Shot RMS      [mm]: 18
        # of Obs per NP          : 
        Use of Semi-trains       : YES
        # of Semi-train Tracks   : 3
      Range Gate Width       [ns]: 4
      Beam Pointing Accuracy  ["]: 60
      Angle Encoder Resolution["]: 4
      Min. Tracking Elev.   [deg]: 28
      Laser Polarization @emitter: 
      Operation
        Months per Year          : 12
        Days per Week            : 7
        Hours per Day            : 10
        Staff per Shift          : 2
        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      : 1983-05-01 HH:MM UT
      Date Last Applicable       : 
      Additional Information     : The observations are carried out for all 
                                 : satellites except above 10000 km


 8.   Calibration

 8.01 Calibration Type           : PRE or POST
      Target Location            : EXTERNAL
      Target Type                : see additional information
      Target Structure           : see additional information
      Number of Targets          : 
      Target Distance(s)      [m]: 1.01
        Date Measured            : 1999-11-13
        Accuracy             [mm]: 5
        Verification             : 
      Return-Rate Controlled     : YES
      Eye-Safe Method            : 
        Additional Information   : 
      Mode of Operation          : FEW PHOTON
      Calibration performed      : 
      Single Shot RMS        [mm]: 7
      Edit Criterion 1st Chain   : ITERATIVE 3.0 SIGMA
      Edit Criterion 2nd Chain   : ITERATIVE 2.5 SIGMA
      Application of Cal Data    : LINEAR FIT
      Date Installed             : 1998-05-15
      Date Removed               : 
      Additional Information     : Pre/Post pass calibration to external 
                                 : target; ranging to effective distance 
                                 : 1.01 m, with 100 echos. Flags regularly 
                                 : in MERIT II format.


 9.   Time and Frequency Standards

 9.01.01 Frequency Standard Type : Oven Controlled Crystal Oscillator
         Model                   : 58503B
         Manufacturer            : HP
         Short Term Stab.  [e-12]: 5
         Long Term Stab.   [e-12]: 1
         Time Reference          : GPS
         Synchronization         : GPS
         Epoch Accuracy      [ns]: 
         Date Installed          : 1999-11-13
         Date Removed            : 
         Additional Information  : 

 9.02.01 GNSS Timing Rcvr Model  : 58503B
         Manufacturer            : HP 
         Date Installed          : 1999-11-13
         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             : IRV+POLYNOMIAL
      Return-Rate Rejection      : 
      Edit Criterion 1st Chain   : ITERATIVE 3.0 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             : 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   : DIGIQUARTZ MET3
         Manufacturer            : Paroscientific
         Recording Interval      : every 10 seconds 
         Accuracy          [mbar]: 0.1
         Height Diff to SRP   [m]: 1.2
         Distance from SRP    [m]: 
         Date Installed          : 1999-11-13 HH:MM UT
         Calibration Interval    : every few years
         Date Removed            : 
         Additional Information  : 

12.02.01 Temp Sensor Model       : Platinum Resistance Temperature Probe
         Manufacturer            : Paroscientific
         Recording Interval      : every 10 seconds
         Accuracy         [deg C]: <=0.5
         Date Installed          : 1999-11-15 HH:MM UT
         Calibration Interval    : every few years
         Date Removed            : 
         Additional Information  : 

12.03.01 Humidity Sensor Model   : Capacitance Probe
         Manufacturer            : Paroscientific
         Recording Interval      : every 10 seconds
         Accuracy       [% rel h]: 2 at 25 deg C
         Date Installed          : 1999-11-15 HH:MM UT
         Calibration Interval    : every few years 
         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            : 
            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                     : NRIAG
      Mailing Address            : National Research Institute of Astronomy
                                 : and Geophysics, 11421, Elmarsed St., 
                                 : Helwan, Cairo, Egypt.
      Website                    : 
      Primary Contact
        Contact Name             : Dr. Makram Ibrahim 
        Telephone (primary)      : +201005799722 
        Telephone (secondary)    : 
        Fax                      : +20 2 25548020  
        E-mail                   : makram@nriag.sci.eg, makikh@yahoo.com
      Secondary Contact
        Contact Name             : 
        Telephone (primary)      : 
        Telephone (secondary)    : 
        Fax                      : 
        E-mail                   : 
      Tertiary Contact
        Contact Name             : 
        Telephone (primary)      : 
        Telephone (secondary)    : 
        Fax                      : 
        E-mail                   : 
      Additional Information     : 


16.   Responsible Agency (if different from 15.)

      Agency                     : Czech Technical University
      Mailing Address            : Faculty of Nuclear Sciences and
                                 : Physical Engineering
                                 : Brehova 7
                                 : 115 19 Prague 1
                                 : Czech Republic
      Primary Contact
        Contact Name             : Dr. Josef Blazej 
        Telephone (primary)      : +420 224 358 659 
        Telephone (secondary)    : 
        Fax                      : +420 2 83072252
        E-mail                   : blazej@fjfi.cvut.cz
      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     :