igarss 2011 - tu4.t05 clement albinet.ppt
TRANSCRIPT
TropiSCAT : A MULTI-FREQUENCY POLINSAR DATA CAMPAIGN OF ACQUISITION FOR
VEGETATION CHARACTERIZATION
Clément ALBINET – Office National d’Etudes et de Recherches Aérospatiales (ONERA)
Pierre BORDERIES – Office National d’Etudes et de Recherches Aérospatiales (ONERA)Thierry KOLECK – Centre National d’Etudes Spatiales (CNES)
Fabio ROCCA – Politecnico di Milano (POLIMI)Stefano TEBALDINI – Politecnico di Milano (POLIMI)
Thuy LE TOAN – Centre d’Etudes Spatiales de la BIOsphère (CESBIO)Ludovic VILLARD – Centre d’Etudes Spatiales de la BIOsphère (CESBIO)
Stéphane MERMOZ – Centre d’Etudes Spatiales de la BIOsphère (CESBIO)Dinh HO TONG MINH – Politecnico di Milano (POLIMI)
IGARSS 2011 VANCOUVER – Tuesday, July 26 – TU4.T05 SAR/Lidar Sensing
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• BIOMASS Mission, candidate for the ESA 7th Earth Explorer Mission
• First Synthetic Aperture Radar (SAR) at P-band
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Introduction and Context
• Forest with high biomass density (>300ton/ha) → PolInSAR
High temporal coherence is necessary !
→ Airborne experiment : TropiSAR (2009) → Ground based experiment : TropiSCAT
(ESA and CNES founding)
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• Introduction and Context
• 1. Experiment description
• 2. Preliminary campaign results
• 3. TropiSCAT first results
• 4. TropiSCAT development
• Conclusion
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Plan
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1. Experiment description
• Goal :• Polarimetric intensity• Polarimetric complex coherence• Polarimetric vertical imaging (tomography)
• Time scales :• Minutes• Daily• Monthly• Yearly
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1. Experiment description
• Equipment :
• VNA – Agilent A5061B :• With IF=1kHz, noise is less than -100 dBm.
• Antennas – SATIMO LP400 :• 400MHz – 1GHz• Adequate 3dB aperture : E - 50° / H - 65°.
• RF Switches :• Solid state switches.
• 70m Low loss cables :• Losses measured in laboratory range from
3 dB at 400 MHz to 5 dB at 1 GHz.
• Industrial Computer :• Compact design• Tropicalized motherboard• Waterproof
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• Location - Requirements :• High biomass density• High number of different tree species• High spot for radar measurement• Safe place for hardware
→ Guyaflux tower in Paracou, French Guiana
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1. Experiment description
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• Location : 55 m high Guyaflux tower in
Paracou, French Guiana
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1. Experiment description
Primary forest
Continuously studied since the seventiesGround data are continuously collected
(weather, soil moisture, tree measurements)
Test site overflown by TropiSAR campaign (ONERA, August 2009)
view from the top of the tower :
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2. Preliminary experiment results
• Project evolution/planning :• October 2010 – Preliminary campaign with light equipment.• June 2011 – Setup of the automatic full-polarimetric backscattering and
coherence measurements.• September 2011 - Setup of the automatic tomographic measurements.
• Instrument architecture :• 2 moving antennas• Direct measurements
To demonstrate the
feasibility of the concept
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2. Preliminary experiment results
• Intensity :
Validation of impulses responses
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2. Preliminary experiment results
Validation of tomograms
• Vertical tomography :
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2. Preliminary experiment results
• HH
• HV
• VV
• Vertical tomography :
Localization of the contributors
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3. TropiSCAT first results
• Project evolution/planning :• October 2010 – Preliminary campaign with light equipment.• June 2011 – Setup of the automatic full-polarimetric backscattering and
coherence measurements.• September 2011 - Setup of the automatic tomographic measurements.
• Instrument architecture :• 4 antennas configuration
RF Transmit
RF Receive
RF switches box
Vector Network Analyzer
Control Unit
Control and Monitoring PC
Ethernet link
US
B link
Guyaflux tower
Internet Gateway(if available )
Antennas
Power line (24V)
Control line
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3. TropiSCAT first results
• Extremely high coherence on tower
• Range gate on the tower at P band :
Validation of coherence measurements
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3. TropiSCAT first results
• Diurnal cycle & High coherence for one day interval• Strong decorrelation during storm, stronger for foliage only• Strong decorrelation night/day• Stronger decorrelation for full forest
High influence of soilProminent influence of soil moisture variation ?
• Further analysis necessary with ground data
• Range gate on the forest at P Band :
24 hours
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3. TropiSCAT first results
• Foliage only at 2 bands :
• Stronger decorrelation at L band
• Stronger decorrelation on HH at L band
P band L band
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3. TropiSCAT first results
• Full forest at 2 bands :
• For HV : day night same order of decorrelation.
• Stronger decorrelation on VV at L band during the whole day, including same hour.• Stronger decorrelation at L band for HH.
P band L band
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4. TropiSCAT development
• Project evolution/planning :• October 2010 – Preliminary campaign with light equipment.• June 2011 – Setup of the automatic full-polarimetric backscattering and
coherence measurements.• September 2011 - Setup of the automatic tomographic measurements.
• Instrument architecture :• Antenna array configuration : 20 antennas
RF Transmit
RF Receive
RF switches box
Vector Network Analyzer
Control Unit
Control and Monitoring PC
Ethernet link
US
B link
Guyaflux tower
Internet Gateway(if available )
Antennas
Power line (24V)
Control line
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• The preliminary experiment has demonstrated the feasibility of the concept
• The TropiSCAT experiment has been partially installed in French Guiana and is currently running
• The first measurements show that TropiSCAT experiment can achieve the scientific objectives
• The first results yield physical interpretation
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Conclusion
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TropiSCAT : A MULTI-FREQUENCY POLINSAR DATA CAMPAIGN OF ACQUISITION FOR VEGETATION CHARACTERIZATION
Thank you for your attention.
(360° panorama from the top of the tower)
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4 antennas configuration
• Project evolution/planning :• October 2010 – Preliminary campaign with light equipment.• June 2011 – Setup of the automatic full-polarimetric backscattering and
coherence measurements.• September 2011 - Setup of the automatic tomographic measurements.
• Antennas configuration :
85cm
70cm
70cm
150cm
T-V T-H R-H R-V
Tower
Forest
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Modeling
• Comparisons between measurements and modeling : Interpret the temporal variations observed in the long term experiment.
• Situation of the plot :• West side of tower• Surface of 172 m²
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Modeling
• Comparisons between measurements and modeling : Comparisons with measurements from the TropiSAR airborne campaign
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DeforestationRegeneration
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Introduction and Context
Carbon fluxes and its uncertainties [BIOMASS 08]
Biomass changes on tropical forests
P-band (435MHz) now available
Carbon Budget