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Measuring acoustic ice properties for the Enceladus Explorer / vorgelegt von Ruth Hoffmann. Wuppertal, 15. Juli 2019
Inhalt
Introduction
Enceladus Explorer
Search for extraterrestrial life
Enceladus
EnEx lander system
IceMole
Dead reckoning system
Acoustic reconnaissance system
Acoustic Positioning System (APS)
Principle
Transducer system
Receiver system
Simulation
Uncertainties on Acoustic Positioning
Trilateration
Monte Carlo Simulation
Individual Uncertainties
Transducer position
Arrival time
Speed of sound
Combined uncertainties
Influence of the transducer geometry
Acoustic signals
Propagation
Attenuation
Acoustic waves in solids
Generation and Detection
Field tests
Challenges and requirements of the APS
Test campaigns on glaciers
Temperate glaciers
Cold glaciers
System tests of the APS
Transducer comparison
Directional and frequency dependencies of the IceMole-Head
Setup
Electronic frequency response
Resonance frequency of ITC-1001
Comparison with IceMole head
Coupling to the ice
Influence of water filled holes on propagation time
Direct comparison
Glacier measurements
Measuring ice properties
Data processing
Frequency filter and Background subtraction
Influence of cracks
Simulation
This Simulation
Results
Measurements
Speed of sound
Arrival time determination methods
Threshold
Cross correlation
Hilbert envelope
Comparison
Results
Directional dependency
Depth dependency
Temperature dependency
Frequency dependency
Attenuation
Methods for estimation of the energy content
Amplitude
Area beneath the curve
Signal to noise ratio
Width of the signal
Results
Frequency dependency
Conclusion
Uncertainties of the probe position
Correction factors
Scan IceMole-Head
Freezing process measuring times
Additional speed of sound plots
Bibliography