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Railway EngineeringDutch Power
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Group: Railway Engineering, TU Delft
1949 – 2006 chair:
Van Veen, Cuperus, Van Bilderbeek, Van Witsen, Esveld
2006 – 2012:
Chair vacancy….
2012 > chair:
Dollevoet (part-time TU Delft and ProRail (Dutch infra manager Railway))
Challange and focus: more for less money, and interfaces research
Group: 13 staff members, 18 PhD’s, 1 PDEng, 4 Postdoc’s,
6 guest researchers
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Remote Sensing satellites
Remote Sensing: Microwave
400 nm
700 nm
1 mm
2.5 cm3.7 cm7.5 cm15 cm30 cm75 cm
Wavelength
Visible light
Infrared
Microwaves
Ultra-high frequency
XCSL
P
Used by satellite-borne radar
Used by airborne radar to see below Earth’s surface
lMicrowave in all weatherCentimeter wavelength millimeter measurement precision
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1st passAt time t1
Satellite measurement:• Amplitude – record the ground
target reflection • Phase – record the location/motion
of the ground targets [-π +π]
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Satellite measurement:• Amplitude – record the ground
target reflection • Phase – record the location/motion
of the ground targets [-π +π]
calculate the phase difference between t1 and t2 -- the settlement value is obtained
2nd passAt time t2
Satellite Radar Interferometry (InSAR) techniques
f1,2
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Q: Can these satellites observe every ground object in railway infrastructure environment?
TrainRailsEmbankmentPolesCatenarySleepersSquat GrassTree …
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Q: Can these satellites observe every ground object in railway infrastructure environment?
TrainRailsEmbankmentPolesCatenarySleepersSquat GrassTree …
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Gas field
(‘risk’ to be defined by end user)
Radarsat-2 data [2010.06 – 2015.08]
ExampleRisk-map
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Rotation matrices:
LOS-vector decomposition
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Linking the satellite reflections to assets.
Using laser scanning data, link every satellite measurement to a specific asset.
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2 – 5 years 5 – 10 years 20 years 50 years
Atrain
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Thanks to my COLLEGUES !