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ILRS Home  Stations Site Listing Helwan
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Helwan: Site Log
Instructions and Update Site Log
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Section: 0. FormSection: 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) :Dr. Makram Ibrahim, Dr. Josef Blazej
Preparer E-mail : makram@nriag.sci.eg
: blazej@fjfi.cvut.cz
Date Prepared : 2009-10-10
Report Type : UPDATE
Format Version : 2.0
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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 : (yyyy-mm-dd)
Geologic Characteristic : Sandstone
Additional Information : The system is operated in annual
Campaigns in cooperation with the Czech
Technical University in Prague
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2. Site Location Information
City or Town : Helwan - Helwan
State or Province : N.A.
Country : Egypt
Tectonic Plate : Africa
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
Additional Information : (multiple lines)
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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]: (m +- m)
East [m]: (m +- m)
Up [m]: (m +- m)
Date Measured : (yyyy-mm-dd)
Date Installed : 1983-05-01
Date Removed : (yyyy-mm-dd)
Additional Information : (multiple lines)
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4. Telescope Information
4.01 Receiving Telescope Type : Keplarian
Aperture [m]: 0.4
Mount : AZ-EL
Xmitting Telescope Type : Gallieleo type, refracting
Aperture [m]: 0.38
Tracking Camera Type : NONE
Model :
Manufacturer :
Field of View [deg]:
Minimum Magnitude [mag]:
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
Transmit Efficiency : ~0.9
Receive Efficiency : ~0.8
Date Installed : 1983-05-01
Date Removed : (yyyy-mm-dd)
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.
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5. Laser System Information
5.01 Laser Type : ND:YAG
Number of Amplifiers : 3
Primary Wavelength [nm]: 1064
Primary Maximum Energy [mJ]: not used for ranging
Secondary Wavelength [nm]: 532
Secondary Max. Energy [mJ]: 80
Xmit Energy Adjustable : YES
Pulse Width (FWHM) [ps]: 20
Max. Repetition Rate [Hz]: 5
Fullw. Beam Divergence ["]: 60-180
Final Beam Diameter [m]: 0.25
Eyesafe : NO
Eyesafe Standard : (ANSI 136.1/N.A./etc)
Date Installed : 1983-05-01
Date Removed : (yyyy-mm-dd)
Additional Information : The laser beam is expanded at the laser
bench to its final diameter/divergence of
25 mm, adjustable 0.5-3 arcminutes.
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6. Receiver System
6.01.01 Primary Chain
Wavelength [nm]: 532
Detector Type : PMT
Manufacturer : Hamamatsu
Model : H 6533
Quantum Efficiency [%]: 10
Nominal Gain : 5.7E+06
Rise Time [ps]: 700
Jitter (Single PE)[ps]: 30
Field of View ["]: 120
Date Installed : 1998-05-15
Date Removed : (yyyy-mm-dd)
Signal Processing : CFD
Manufacturer : Tennelec
Model : TC454
Date Installed : 1998-05-15
Date Removed : (yyyy-mm-dd)
Amplitude Measurement : NO
Return-rate Controlled: YES
Mode of Operation : Single to Multi Photons
Time of Flight Observ. : INTERVAL
Manufacturer : Stanford
Model : 620
Resolution [ps]: 4
Precision [ps]: 30
Date Installed : 1999-05-15
Date Removed : (yyyy-mm-dd)
Additional Information : (multiple lines)
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7. Tracking Capabilities
7.01 Satellites
Very Low Alt (<400 km) : NIGHT
Low Altitude (400-2000) : NIGHT
Lageos : NIGHT
GLONASS : NO
Etalon : NO
GPS : NO
Moon : NO
Avge 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
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
Date First Applicable : 1983-05-01
Date Last Applicable : (yyyy-mm-dd)
Additional Information : The observations are carried out for all
satellites except above 10000 km
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8. Calibration
8.01 Calibration Type : PRE+POST
Target Location : EXTERNAL
Target Type : see additional information
Target Structure : see additional information
Target Distance [m]: 1.01
Date Measured : 1999-11-13
Accuracy (mm) [mm]: 5
Verification :
Return-rate Controlled : YES
Mode of Operation : SINGLE
Average Cal Interval [min]:
Single Shot RMS [mm]: 7
Edit Criterion 1st Chain : 3.0 SIGMA
Edit Criterion 2nd Chain : 2.5 SIGMA
Application of Cal Data : LINEAR FIT
Date Installed : 1998-05-15
Date Removed : (yyyy-mm-dd)
Additional Information : Pre/Post pass calibration to external
target; ranging to effective distance
1.01 m, with 150 echos. Flags regularly
in MERIT II format.
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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 : (yyyy-mm-dd)
Additional Information : (multiple lines)
9.02.01 GPS Timing Rcvr Model : 58503B
Manufacturer : HP
Date Installed : 1999-11-13
Date Removed : (yyyy-mm-dd)
Additional Information : (multiple lines)
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10. Preprocessing Information
10.01 On-site NP Generation : YES
Data Screening : IRV+POLYNOMIAL
Edit Criterion 1st Chain : ITERATIVE 3.0 SIGMA
Edit Criterion 2nd Chain : N.A.
Upload interval : DAILY
Date First Applicable : (yyyy-mm-dd)
Date Last Applicable : (yyyy-mm-dd)
Additional Information : (multiple lines)
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11. Aircraft Detection
11.01 Detection Type : MOUNT OBSERVER
Date Installed : (yyyy-mm-dd)
Date Removed : (yyyy-mm-dd)
Additional Information : (multiple lines)
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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
Date Installed : 1999-11-13
Calibration Interval : every few years
Date Removed : (yyyy-mm-dd hh:mm UT)
Additional Information : (multiple lines)
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
Calibration Interval : every few years
Date Removed : (yyyy-mm-dd hh:mm UT)
Additional Information : (multiple lines)
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
Calibration Interval : every few years
Date Removed : (yyyy-mm-dd hh:mm UT)
Additional Information : (multiple lines)
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13. Local Ties, Eccentricities, and Collocation Information
13.01 Collocated Permanent Geodetic Systems
GPS : NO
Date Installed : (yyyy-mm-dd)
Date Removed : (yyyy-mm-dd)
Additional Information : (multiple lines)
GLONASS : NO
Date Installed : (yyyy-mm-dd)
Date Removed : (yyyy-mm-dd)
Additional Information : (multiple lines)
DORIS : NO
Date Installed : (yyyy-mm-dd)
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 : NO
Date Installed : (yyyy-mm-dd)
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.xx 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)
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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 : NRIAG
Mailing Address : Space Science Lab. Elmarsed
St. Helwan,11421, Cairo, Egypt.
Primary Contact
Contact Name : Dr. Makram Ibrahim
Telephone (primary) : +20105799722
Telephone (secondary)
Fax : +20 2 25548020
E-mail : makram@nriag.sci.eg
: makikh@yahoo.com
Secondary Contact
Contact Name : Dr. Khalil Ibrahim Khalil
Telephone (primary) : +20104012142
Telephone (secondary)
Fax : +20 2 5548020
E-mail : khalil112@hotmail.com
Additional Information :
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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 : (multiple lines)
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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 : (multiple lines)
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