Validation of radiometric models and simulated KaRIn/SWOT data based on ground and airborne acquisitions Roger Fjørtoft, Jean-Claude Lalaurie, Nadine Pourthie, Christine Lion, Jean-Marc Gaudin, Alain Mallet (CNES, Toulouse, France), Jean-François Nouvel, Pierre Borderies (ONERA, Toulouse/Salon de Provence, France), Pascal Kosuth (CEMAGREF, Montpellier, France), Christian Ruiz (Capgemini, Toulouse, France). IGARSS 2011, Vancouver, Canada, 25-29 July 2011
Validation of radiometric models and simulated KaRIn/SWOT data based on ground and airborne acquisitions. Roger Fjørtoft, Jean-Claude Lalaurie, Nadine Pourthie, Christine Lion, Jean-Marc Gaudin, Alain Mallet ( CNES, Toulouse, France ), - PowerPoint PPT Presentation
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Validation of radiometric models and simulated KaRIn/SWOT
IGARSS 2011, Vancouver, Canada, 25-29 July 2011 6SWOT
Espiguette (buoy)
Acquisition sites in the Camargue area (2011)
Piemanson
Vaccarès
Rhône
IGARSS 2011, Vancouver, Canada, 25-29 July 2011 7SWOTAmplitude
voie a
~700 m
0°
13°~2,6 km
~1°
0°
~4°
~10°
Trihedrals
Artifacts due to wide antenna lobe (right/left contamination)
DRIVE/BUSARD acquisition 24/02/2011 (Rhône)
IGARSS 2011, Vancouver, Canada, 25-29 July 2011 8SWOT
DRIVE/BUSARD acquisition 24/02/2011 (Rhône)
Phase (interferogram)
IGARSS 2011, Vancouver, Canada, 25-29 July 2011 9SWOT
DRIVE/BUSARD acquisition 24/02/2011 (Rhône)
Coherence
>0.9~0.7
~0.3
IGARSS 2011, Vancouver, Canada, 25-29 July 2011 10SWOTAmplitude
DRIVE/BUSARD acquisition 14/04/2011 (Vaccarès)
IGARSS 2011, Vancouver, Canada, 25-29 July 2011 11SWOT
DRIVE/BUSARD acquisition 14/04/2011 (Vaccarès)
Amplitude 1 Amplitude 2 Coherence Phase
IGARSS 2011, Vancouver, Canada, 25-29 July 2011 12SWOT
DRIVE/BUSARD acquisition 14/04/2011 (Espiguette)
Amplitude
IGARSS 2011, Vancouver, Canada, 25-29 July 2011 13SWOT
DRIVE/BUSARD acquisition 14/04/2011 (Espiguette)
Amplitude 1 Amplitude 2 Coherence Phase
IGARSS 2011, Vancouver, Canada, 25-29 July 2011 14SWOTAmplitude
DRIVE/BUSARD acquisition 25/05/2011 (Rhône)
IGARSS 2011, Vancouver, Canada, 25-29 July 2011 15SWOT
Near-field measurements in Ka-band (1/2)
■Near-field Ka-band measurements of 0 of water with a network analyzer and an automatically steerable (0-10°) parabolic antenna (ONERA)
■Simultaneous measurement of water surface roughness (using immerged pressure sensors) and wind speed (CEMAGREF)
■Rapidly varying wind conditions make the interpretation of the first results complicated.
IGARSS 2011, Vancouver, Canada, 25-29 July 2011 16SWOT
Near-field measurements in Ka-band (2/2)
■Acquisitions in the Large Air-Sea Interaction Facility (LASIF) at IRPHE (Luminy): 40 m wind tunnel + 40 m water tank
■Possibility to study wind-generated water roughness (waves) in stable conditions (as well as to add mechanically generated waves)
■Additional equipment for optical roughness characterization (IRPHE)
■Comparison of 0 profiles with radiometric models (CapGemini)
IGARSS 2011, Vancouver, Canada, 25-29 July 2011 17SWOT
Water 0 as a function of wind speed
Incidence (°/100)
0 (
dB
)
Wind parallel to incidence directionWind perpendicular to incidence direction
0 (
dB
)
Incidence (°/100)
IGARSS 2011, Vancouver, Canada, 25-29 July 2011 18SWOT
Conclusion
■Airborne acquisitions with DRIVE/BUSARD First interferometric Ka-band acquisitions including the near-nadir
incidence range of KaRIn/SWOT (1-4°) Confirmation of main feasibility and measurement physics assumptions Will allow to refine models and simulators Experience gained w.r.t. InSAR processing and ground truth collection Hydrology, coastal and ocean test sites covered; possible extension to other
surface types: forest, snow/ice, …
■Near field measurements of water surfaces0 as a function of incidence and wind speed / surface roughness
Interesting phenomena observed; comparison with models ongoing Wind-generated roughness only; possibility of adding waves mechanically Complementary in situ and wind/water tank measurements