Multichannel Azimuth Processing in ScanSAR and TOPS Mode ...
Demonstration of TerraSAR-X ScanSAR Persistent...
Transcript of Demonstration of TerraSAR-X ScanSAR Persistent...
Demonstration of TerraSAR-X ScanSAR Persistent Scatterer Interferometry
F. Rodriguez Gonzalez(1), R. Brcic(1), Nestor Yague-Martinez(2), R. Shau(1), A. Parizzi(1), N. Adam(1)
(1) German Aerospace Center (DLR) (2) Technische Universität München (TUM)
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• Preparation for Sentinel-1 TopSAR acquisition mode • Wide Area PSI demonstration with TerraSAR-X ScanSAR Mode
Terrafirma – ESA Project
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TopSAR Mode ScanSAR Mode
ESRIN/Contract no. C19366/05/I-EC/DLR
TerraSAR-X ScanSAR Mode
• Azimuth variant spectrum -> Coregistration requirement
Terrafirma – ESA Project
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Sentinel-1 TopSAR Mode
~320 Hz
~475 Hz ~4400 Hz
~2000 Hz
∆𝑓𝑓𝐷𝐷𝐷𝐷𝐵𝐵𝐵𝐵𝑎𝑎𝑎𝑎
≈ 14 ∆𝑓𝑓𝐷𝐷𝐷𝐷𝐵𝐵𝐵𝐵𝑎𝑎𝑎𝑎
≈ 4
Test Site: Lake Mead - Hoover Dam
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• Lake Mead water elevation
Test Site: Lake Mead - Hoover Dam
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Water level data source : Bureau of reclamation. http://www.usbr.gov
Dataset: TerraSAR-X ScanSAR Stack
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Dataset: TerraSAR-X ScanSAR Stack
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Dataset: TerraSAR-X ScanSAR Stack
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INT_8957
Slave Acquisition 2009-01-25
Effective Baseline 40.4 m
Height of Ambiguity -93.8 m
Slave Acquisition 2009-11-29
Effective Baseline 51.6 m
Height of Ambiguity -73.5 m
INT_13633
Dataset: TerraSAR-X ScanSAR Stack
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INT_11462
Slave Acquisition 2009-07-09
Effective Baseline 107.7 m
Height of Ambiguity -35.2 m
• Partition of scene for SCR-based detection
PSI Detection
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PSI Detection
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• Effect of burst synchronization on stack
2.3 km
• Point target response squint
• Master scene
• Slave scene
PSI Arc Estimation
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𝑠𝑠 𝑡𝑡, 𝜏𝜏 = 𝑠𝑠𝑟𝑟(𝜏𝜏 − 𝜏𝜏0) ∙ 𝑠𝑠𝑟𝑟(𝑡𝑡 − 𝑡𝑡0 − 𝑘𝑘 ∙ (𝜏𝜏 − 𝜏𝜏0)) ∙
𝑒𝑒𝑒𝑒𝑒𝑒 −𝑗𝑗 4𝜋𝜋𝜆𝜆𝑟𝑟0 ∙ 𝑒𝑒𝑒𝑒𝑒𝑒 −𝑗𝑗𝑗𝑗𝑗𝑓𝑓0(𝑐𝑐𝑐𝑐𝑠𝑠𝑐𝑐 − 1)(𝜏𝜏 − 𝜏𝜏0) ∙ 𝑒𝑒𝑒𝑒𝑒𝑒 𝑗𝑗𝑗𝑗𝑗𝑓𝑓𝐷𝐷𝐷𝐷 (𝑡𝑡 − 𝑡𝑡0)
𝜙𝜙1𝑀𝑀 = −4𝑗𝑗𝜆𝜆 𝑟𝑟01
𝑀𝑀 + 𝑗𝑗𝑗𝑓𝑓𝐷𝐷𝐷𝐷,1𝑀𝑀 Δ𝑡𝑡𝑃𝑃𝑃𝑃𝑃𝑃,1
𝜙𝜙1𝑆𝑆 = −4𝑗𝑗𝜆𝜆 𝑟𝑟01
𝑆𝑆 + 𝑗𝑗𝑗𝑓𝑓𝐷𝐷𝐷𝐷,1𝑆𝑆 (Δ𝑡𝑡𝑃𝑃𝑃𝑃𝑃𝑃,1 − Δ𝑡𝑡𝐷𝐷𝐶𝐶)
Δ𝑡𝑡𝐷𝐷𝐶𝐶
Δ𝑡𝑡𝑃𝑃𝑃𝑃𝑃𝑃,1
• Interferogram
• Double difference -> arc estimation
PSI Arc Estimation
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𝜙𝜙1𝐼𝐼 = 𝜙𝜙1𝑀𝑀 − 𝜙𝜙1𝑆𝑆 = −4𝑗𝑗𝜆𝜆
𝑟𝑟01𝑀𝑀 − 𝑟𝑟01
𝑆𝑆 − 𝑗𝑗𝑗 𝑓𝑓𝐷𝐷𝐷𝐷,1𝑀𝑀 − 𝑓𝑓𝐷𝐷𝐷𝐷,1
𝑆𝑆 Δ𝑡𝑡𝑃𝑃𝑃𝑃𝑃𝑃,1 + 𝑗𝑗𝑗𝑓𝑓𝐷𝐷𝐷𝐷,1𝑆𝑆 Δ𝑡𝑡𝐷𝐷𝐶𝐶
= −4𝜋𝜋𝜆𝜆∆𝑟𝑟0,1
𝑀𝑀→𝑆𝑆 − 𝑗𝑗𝑗∆𝑓𝑓𝐷𝐷𝐷𝐷,1𝑀𝑀→𝑆𝑆Δ𝑡𝑡𝑃𝑃𝑃𝑃𝑃𝑃,1 + 𝑗𝑗𝑗𝑓𝑓𝐷𝐷𝐷𝐷,1
𝑆𝑆 Δ𝑡𝑡𝐷𝐷𝐶𝐶
𝜙𝜙1𝐼𝐼 − 𝜙𝜙2𝐼𝐼 = −4𝑗𝑗𝜆𝜆 ∆𝑟𝑟0,1
𝑀𝑀→𝑆𝑆 − ∆𝑟𝑟0,2𝑀𝑀→𝑆𝑆
−𝑗𝑗𝑗∆𝑓𝑓𝐷𝐷𝐷𝐷,1
𝑀𝑀→𝑆𝑆𝛥𝛥𝑡𝑡𝑃𝑃𝑃𝑃𝑃𝑃,1+ 𝑗𝑗𝑗∆𝑓𝑓𝐷𝐷𝐷𝐷,2𝑀𝑀→𝑆𝑆Δ𝑡𝑡𝑃𝑃𝑃𝑃𝑃𝑃,2
+ 𝑗𝑗𝑗(𝑓𝑓𝐷𝐷𝐷𝐷,1
𝑆𝑆 −𝑓𝑓𝐷𝐷𝐷𝐷,2𝑆𝑆 )Δ𝑡𝑡𝐷𝐷𝐶𝐶
Model (∆v, ∆h)
Sub-pixel position
Controlled by ScanSAR / TOPS corregistration
• Simplified estimation: linear fit of phase-versus-height for a target area • Limitations, valid for processor initial testing
Stratification Mitigation
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Raw extracted PS phase PS phase after stratification mitigation
• Effect in arcs estimates and network construction • Higher coherence • Arcs between different heighs, higher redundancy / control
Stratification Mitigation
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Arc quality and network construction without stratification mitigation
Arc quality and network construction with stratification mitigation
• Further steps remain algorithmically unchanged • Reference network inversion • APS estimation • Final estimations
PSI Processing
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Linear Deformation Rate
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Linear deformation (ramp compensated)
Without stratification mitigation
Linear Deformation Rate
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• Cavalié, O., M.-P. Doin, C. Lasserre, and P. Briole (2007), Ground motion measurement in the Lake Mead area, Nevada, by differential synthetic aperture radar interferometry time series analysis: Probing the lithosphere rheological structure, J. Geophys. Res., 112, B03403, doi:10.1029/2006JB004344.
Linear Deformation Rate
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Linear Deformation Rate
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• Residual topography between
• STRM • Acquired in February 2000 • Lake Mead water level : 370 m (1213.79 feet, monthly average)*
• Master scene • Acquired in December 2009 • Lake Mead water level : 334 m (1096.30 feet, monthly average)*
Residual Topography
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* Water level data source : Bureau of reclamation. http://www.usbr.gov
Residual Topography
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Residual Topography
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Spatial average PS coherence
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• PS Coherence evaluated in 200 Hz Doppler Centroid bins
PS coherence statistics
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Spatial average PS Density
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„Secondary PS“
• Partition of scene for SCR-based detection
PSI Detection
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• Extraction at sub-pixel position detected in another burst
→ Every secondary PS has a corresponding primary PS
→ But with a different Doppler Centroid
Secondary PS
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Primary
Secondary
• Primary – Secondary PS -pairs
Secondary PS
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~2000 Hz Intra Beam ~ 1500 Hz Inter Beam ~ 500 Hz Inter Beam
Secondary PS Estimates
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~2000 Hz Intra Beam ~ 1500 Hz Inter Beam ~ 500 Hz Inter Beam
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Secondary PS
• Coherence loss versus power loss
~ 1500 Hz Inter Beam ~ 500 Hz Inter Beam
• Std. deviation of phase residuals
Behaviour of Scatterers
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0.7 < Coherence < 0.9 0.9 < Coherence < 1.0
• Primary – Secondary PS -pairs
Secondary PS
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~2000 Hz Intra Beam ~ 1500 Hz Inter Beam ~ 500 Hz Inter Beam
• Potential uses of Primary – Secondary pairs • Potential use of PS Enhanced Spectral Diversity
Secondary PS
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ESD
PS
ESD
~2000Hz Intra Beam ~1500 Hz Inter Beam ~500Hz Inter Beam
• Demonstration of TerraSAR-X ScanSAR PSI
• Revisit available ScanSAR stacks
• Strategy to exploit PS ESD to control coregistration after PS detection
• Further work
• Explotation of PSI APS for DSI processing
• Study the overlap area in urban areas • Explotaiton of Sentinel-1
Conclusions and Outlook
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