Zimmerwald
SLR System Configuration Definition
SYSTEM CONFIGURATION DEFINITION
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SYSTEM NAME: ZIMMERWALD
PAD ID NO.: 7810 (CDP Number)
ADDRESS: Astronomical Institute
University of Berne
Sidlerstrasse 5
CH-3012 Berne
CONTACT: Werner Gurtner
PHONE: ++41 / 31 6318591
FAX: ++41 / 31 6313869
E-MAIL: gurtner@aiub.unibe.ch
Remark: The system (telescope,laser,electronics,computer) will be removed
in spring 1995 and replaced by a
new system during the following months. The new system is
expected to be operational again end of 1995.
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SECTION 1.0 - SYSTEM RANGING CAPABILITY
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SECTION 1.1 SYSTEM RANGING FEATURES
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FEATURES /CURRENT RANGING / RANGING / DATE / FUTURE /
/CAPABILITY / PHOTOELECTRON / / RANGING /
/ CAPABILITY/
===============================================================================
Calibration:
Internal / yes / 1-... / May-84 / /
External / yes / 1-... / May-84 / /
* Internal Calibration: Refers to the capability for ranging to a
target within the system.
* External Calibration: Refers to the capability for ranging to
terrestrial targets.
SECTION 1.2 ADVANCED SYSTEM RANGING FEATURES
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TARGET /CURRENT RANGING / RANGING / DATE / FUTURE /
/CAPABILITY / PHOTOELECTRON / / RANGING /
/ CAPABILITY /
===============================================================================
Two-Color Capability/ no / / / /
Manual Track / yes / / / /
Tracking:
Semi-Automated / yes / / May-84 / /
Fully Automated / low sat: yes/ / " / /
Section 1.3 System Ranging Targets
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TARGET /CURRENT RANGING / RANGING / DATE / FUTURE /
/CAPABILITY / PHOTOELECTON / / RANGING /
/ CAPABILITY/
==============================================================================
STARLETTE / yes / 1 - ... / May-84 /
STELLA / yes / 1 - ... / " /
ERS-1 / yes / 1 - ... / " /
AJISAI / yes / 1 - ... / " /
TOPEX / yes / 1 - ... / " /
LAGEOS 1 / yes / 1 - ... / " /
LAGEOS 2 / yes / 1 - ... / " /
ETALON 1 / no / / /
ETALON 2 / no / / /
GLONASS 3 / no / / /
GPS-3,5 / no / / /
Geosynchronous / no / / /
Satellite / / / /
Moon / no / / /
SECTION 2.0 - HARDWARE CONFIGURATION / CAPABILITY
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SECTION 2.1 LASER CONFIGURATION CATEGORY
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LASER / SPECIFICATIONS / DATE / FUTURE /APPROX./
/ / / CHANGES /DATE /
===============================================================================
Type of Laser Medium / Nd:YAG / May-84 / / /
Energy / Pulse (mJ) / 20 mJ/ / / /
Pulsewidth (ps) / 200 ps/ / / /
Beam Size / 10 mm / / / /
Beam Divergence(Half Angle) 500 microrad/ / / /
Beam Divergence Control / afocal telescope / / / /
Amplitude Stability / 10 %/ / / /
Timing Stability / 5 microsec/ / / /
Transverse Mode Structure / TEM00 ?? cm/ / / /
Ranging Wavelength(s) / 532.0 nm/ / / /
Repetition Rate / 10 Hz/ / / /
Other / / / / /
SECTION 2.2 MOUNT CONFIGURATION CATAGORY
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SECTION 2.2.1
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TELESCOPE/ MOUNT / SPECIFICATIONS / DATE / FUTURE /APPROX./
/ / / CHANGES /DATE /
===============================================================================
Telescope Type / / / / /
Transmitting / galilean /
Receiving / cassegrain /
Biaxial Telescope / yes / / / /
Monoaxial Telescope / / / / /
Mount Type / az/alt / / / /
Field of View / / / / /
Laser Rcvr / few arc minutes /
Guiding (TV) / 30 arc minutes /
Focal Length / 1 m / / / /
Magnification / / / / /
Pointing Accuracy / 30 arcsec / / / /
After STARCAL
Satellite:
Common T/R Optical Path / no / / / /
Separate T/R Optical Path / yes / / / /
Calibration:
Common T/R Optical Path / no / / / /
Separate T/R Optical Path / yes / / / /
Orthogonality of Axes / calibrated / / / /
Wobble on Each Axis:
Elevation / unknown / / / /
Azimuth / unknown / / / /
Elevation / / / / /
- Range 180 deg
- Encoder Resolution / 0.001 deg / / / /
- Position Jitter / 0.001 deg / / / /
- Maximum EL Velocity / 3.5 deg / / / /
- Maximum EL Acceleration/ / / / /
Azimuth / / / / /
- Range / 540 deg / / / /
- Encoder Resolution / 0.001 deg / / / /
- Position Jitter / 0.001 deg / / / /
- Maximum Az Velocity / 7 deg / / / /
- Maximum Az Acceleration/ / / / /
PRIMARY MIRROR / / / / /
Type / spherical / / / /
Clear Aperture (CA) / 52 cm / / / /
Focal Length / 1 m / / / /
Optical Coating / aluminium / / / /
SECONDARY MIRROR / / / / /
Type / spherical / / / /
Clear Aperture (CA) / / / / /
Focal Length / / / / /
Optical Coating / dielectric / / / /
TERTIARY MIRROR / / / / /
Type / N/A / / / /
Clear Aperture / / / / /
COUDE MIRRORS / / / / /
Type / flat / / / /
Clear Aperture / 4 cm / / / /
Optical Coating / dielectric @532nm/ / / /
SECTION 2.3 OPTICAL CONFIGURATION CATAGORY
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TRANSMIT/ RECEIVE OPTICS / SPECIFICATIONS / DATE / FUTURE /APPROX./
/ / / CHANGES /DATE /
===============================================================================
T/R Coupling Scheme:
- Type / separate paths / / / /
- Coupling Efficiency / / / / /
Spatial Filter: / / / / /
- Field of View / few arc min / / / /
Band-Pass Filter: / / / / /
- Type / / / / /
- Bandwidth / 10 nm / / / /
- Blocking Bandwidth / / / / /
- Transmission Efficiency/ / / / /
Receive Signal Amplitude
Control Mechanism /chnge transm.power/ / / /
chnge beam diverg.
SECTION 2.4 TRANSMIT/ RECEIVE (T/R) ELECTRONICS CONFIGURATION SECTION
=====================================================================
T/R ELECTRONICS / SPECIFICATIONS / DATE / FUTURE /APPROX./
/ / / CHANGES /DATE /
===============================================================================
Transmit Detector: / pin diode /
- Quantum Efficiency / / / / /
- Gain / / / / /
- Bandwidth / / / / /
- Jitter (single pe) / / / / /
- Impulse Response/
Rise Time / / / / /
- Pulse Width / / / / /
- Dynamic Range / / / / /
Receive Detector(s) /PMT EMI D341-100 / / / /
- Quantum Efficiency / / / / /
- Gain / 4x10E7 / / / /
- Bandwidth / / / / /
- Jitter (single pe) / / / / /
- Pulse Width / / / / /
- Impulse Response/
Rise Time / 1.3 ns / / / /
- Dynamic Range / / / / /
Amplifier / N/A / / / /
- Type: / / / / /
- Bandwidth: / / / / /
- Jitter: / / / / /
- Dynamic Range / / / / /
TARGET IMAGING Capability / ISIT-Camera / / / /
- Type of camera / JAI 743 / / / /
- Gain / / / / /
- Sensitivity / 285 uA/lm / / / /
Signal Processing Technique/ CFD / / / /
- Type of Device / Tennelec TC 454 / / / /
- Length of External
Delay Cable / 40 cm / / / /
- Bandwidth / / / / /
- Dynamic Range(pe) / / / / /
- Jitter / / / / /
EVENT TIMER or TIME OF FLIGHT MEASUREMENT?
/ Time of flight / / / /
- Type of Device / LeCroy 4202 TDC / / / /
- Clock Frequency / 100 MHz / / / /
- Number of Channels / 1 / / / /
- Number of Verniers / 1 / / / /
- Minimum Dead Time / / / / /
- Time Resolution / 156 psec / / / /
- Aggregate Jitter / / / / /
Amplitude Measurement / yes / / / /
- Type of Device / LeCroy 2249A / / / /
- Bandwidth / / / / /
- Accuracy / / / / /
- Part of Data Stream? / yes / / / /
System Delay Calibration / / / / /
Internal Calibration Capability
Location of Target(s) / within transmit and receiving path / /
in the telescope
Range of Target(s) / few meters / / / /
External Calibration Capability
Location of Target(s) / power line pole / / / /
Range(s) of Target(s) / 1 km / / / /
SECTION 2.6 TIMING CONFIGURATION SECTION
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TIMING / SPECIFICATIONS / DATE / FUTURE /APPROX./
/ / / CHANGES /DATE /
===============================================================================
Frequency Standard(s) used/ BVA Quartz / 8-7-85 / / /
Frequencies / 5MHz / / / /
Short-Term Stability / 5x10E-13 .1->10sec/ / / /
Long-Term Stability / 2x10E-11 per day / / / /
Epoch Time Measurement: / GPS + TV comparison / / /
- Type of Device / / / / /
- Resolution / 0.1 usec / / / /
- Timing Closure / / / / /
SECTION 2.7 METEOROLOGICAL SENSORS CONFIGURATION CATAGORY
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METEOROLOGICAL SENSORS / SPECIFICATIONS / DATE / FUTURE /APPROX./
/ / / CHANGES /DATE /
===============================================================================
Thermometer
Type / Rotronic I-240W / MAY 1989 / / /
Accuracy (calibrated) / 0.2 =F8C / / / /
Resolution / 0.1 =F8C / / / /
Range / -30...+70 =F8C / / / /
Barometric Pressure System
Type / Haenni / MAY 1989 / / /
Accuracy (calibrated) / 0.2 mbar / / / /
Range / 900...1050 mbar / / / /
Relative Humidity System
Type / Rotronic I-240W / MAY 1989 / / /
/ Hygromer /
System Accuracy / 2 % / / / /
Resolution / 0.1 % / / / /
System Range / 0...100 % / / / /
Wind Measurement System / N/A / / / /
Type / / / / /
Sensor / / / / /
Range / / / / /
Accuracy / / / / /
Resolution / / / / /
Threshold / / / / /
SECTION 4.0 SURVEY MEASUREMENT CONFIGURATION / CAPABILITY
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SECTION 4.1 SURVEY MEASUREMENTS
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SURVEYING INSTRUMENT / ACCURACY / PRECISION
=========================================================================
/ /
/ /
/ /
Survey performed by Federal Office of Topography
SECTION 4.2 SURVEY ANALYSIS
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SURVEY ANALYSIS TECHNIQUE
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* (PLEASE GIVE DESCRIPTION OF THE TECHNIQUE USED)
*
*
Least squares adjustment by Federal Office of Topography
SECTION 4.3 SURVEY CALIBRATION TARGET
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TARGET / TYPE / RANGE / AZ / EL / RANGE / RANGE / SHORT / LONG
/ / ACCURACY/ / / PRECISION / / TERM / TERM
/ / / / / / / STABILITY /STABILITY
===============================================================================
1 / / / / / / / /
2 / / / / / / / /
3 / / / / / / / /
4 / / / / / / / /
Internal calibration path measured with precise tapes and rods.
SECTION 4.4 ECCENTRICITY DETERMINATION
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/ NORTH / EAST / UP
===============================================================================
Mean Value / 0 / 0 / 0
Accuracy / 1 mm / 1 mm / 1 mm
Precision / / /
Short Term Stability / / /
Long Term Stability / / /
Intersection of axes is reference. Ties to local markers by geodetic means
(Federal Office of Topography).
SECTION 5.0 CALIBRATION TECHNIQUE / CAPABILITY
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SECTION 5.1 CALIBRATION DEVICES AND FREQUENCY
=============================================
==============================================================================
// CALIBRATION FREQUENCY
==============================================================================
DEVICE/ FEATURE / SATELLITE / PASS / DAY / MONTH / YEAR
==============================================================================
Event Timer / / / / /
Time of Flight Devices / / / / /
Discriminator / / / / /
Pressure Sensor / once a year /
Temperature Sensor / / / / /
Timing System / once a year by clock transport /
System Delay / during each pass (every 6th obs is cal obs) /
SECTION 6.0 SYSTEM TIMING CLOSURE CONFIGURATION
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SECTION 6.1 TIMING CLOSURE
===========================
Reference Time:
Accuracy of Timing:
Modeling of Time Drift:
SECTION 7.0 SYSTEM DATA ANALYSIS CONFIGURATION / CAPABILITY
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SECTION 7.1 DATA ANALYSIS
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DATA CORRECTIONS ( YES : NO ) / ADDITIONAL INFORMATION
===========================================================================
7.1.1 Transmit Signal Amplitudes: no /
7.1.2 Receive Signal Amplitudes: yes /
7.1.3 Timing yes /
7.1.4 Instrument Non-Linearities no /
7.1.5 Geometric Corrections no /
7.1.6 Atmosphere no /
SECTION 7.2 System Delay Computation:
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SYSTEM DELAY COMPUTATION FREQUENCY ( YES : NO ) /ADDITIONAL INFORMATION
===============================================================================
7.2.1 Shot by Shot: /
7.2.2 Burst or Short Time Aggregate: /
7.2.3 Aggregate: average of all delay measurements
during the pass
SECTION 7.3 DATA ANALYSIS TECHNIQUES / CAPABILITIES
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7.3.1 Normal Point Computation: yes: on site computation
7.3.2 Fitting Routine (Algorithms): best-fitting orbit integrated
through observations
7.3.3 Noise Filtering and Editing Procedures: 3 sigma
7.3.4 Data Quality Control Procedures: rms of fitting,
display of residuals
7.3.5 System Computational Capability: All computations done on site
SECTION 8.0 SYSTEM ATMOSPHERIC TECHNIQUES
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SECTION 8.1 ATMOSPHERIC MODEL
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8.1 Atmospheric Model Used:
* ( PLEASE DESCRIBE THE MODEL IN AS MUCH DETAIL AS POSSIBLE )
Marini Murray Model
SECTION 9.0 SYSTEM PERFORMANCE CHARACTERISTICS
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SECTION 9.1 RANGING SYSTEM ERRORS
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RANGING SYSTEM ERRORS / ACCURACY / 1 SIGMA / PEAK - PEAK /DATE /
=============================================================================
Temporal Stability / / / / /
Wavefront Distortion / / / / /
Signal Strength Dependence / / 5 mm / / /
Calibration Path / / 2 mm / / /
Mount Eccentricities / / 1 mm / / /
Meteorological Measurement / / / / /
Temperature 1 deg C
Pressure 0.5 mbar
Humidity 5 %
Event Timer / / / / /
Time of Flight Measurement / / 0.5 ns / / /
Epoch Time Measurement / / 0.5 us / / /
Data Analysis / / / / /
Normal Point Computation / / / / /
System Delay Computation / / 0.05 ns / / /
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