Exploring the Potential Pol-InSAR Techniques at X-Band: First Results & Experiments from TanDEM-X

Size: px

Start display at page:

Download "Exploring the Potential Pol-InSAR Techniques at X-Band: First Results & Experiments from TanDEM-X"

Michael Wilcox
5 years ago
Views:

1 Exploring the Potential Pol-InSAR Techniques at X-Band: First Results & Experiments from TanDEM-X K. Papathanassiou, F. Kugler, J-S. Kim, S-K. Lee, I. Hajnsek Microwaves and Radar Institute (DLR-HR) German Aerospace Center (DLR)

2 TanDEM-X Data Acquisition Modes Pursuit Monostatic July until Bistatic October 2010 Alternating Bistatic both satellites transmit and receive independently susceptible to temporal decorrelation & atmospheric disturbances no PRF and phase synchronisation required (backup solution) one satellite transmits and both satellites receive simultaneously small along-track displacement required for Doppler spectra overlap requires PRF and phase synchronisation Standard DEM Mode transmitter alternates between PRF pulses provides three interferograms with two baselines in a single pass enables precise phase synchronisation, calibration & verification Temporal baseline: 2-3 sec (20-30Km Across Track separation)

3 Teneriffa 2x Bistatic

4 Teneriffa (2x bistatic) Coherence 87m HoA (kz 0.075) vs. 25m HoA ( 0.27) Different Geometries

5 TSX-TDX Monostatic Mission Phase Test Site Mawas / Borneo HH Pol / Baseline: 38m HH Pol / Baseline: 35m HH Pol / Baseline: 54m

6 TSX-TDX Monostatic Mission Phase Test Site Mawas / Borneo HH Pol Baseline: 38m HH Pol Baseline: 35m HH Pol Baseline: 54m

7 TanDEM-X Data Acquisition Modes Pursuit Monostatic Bistatic Alternating Bistatic both satellites transmit and receive independently susceptible to temporal decorrelation & atmospheric disturbances no PRF and phase synchronisation required (backup solution) one satellite transmits and both satellites receive simultaneously small along-track displacement required for Doppler spectra overlap requires PRF and phase synchronisation Standard DEM Mode transmitter alternates between PRF pulses provides three interferograms with two baselines in a single pass enables precise phase synchronisation, calibration & verification m Across Track separation

8 First Bistatic Dual Pol-InSAR Data Takes Dual-Pol HH-VV Stripmap Test Site Location: OP InSAR Mode: Bistatic Temporal Baseline: 0.?sec Vertical Wavenumber: 0.1 HH VV

9 First Bistatic Dual Pol-InSAR Data Takes Dual-Pol HH-VV Stripmap Test Site Location: OP InSAR Mode: Bistatic Temporal Baseline: 0.?sec Vertical Wavenumber: 0.1 HH VV

10 First Bistatic Dual Pol-InSAR Data Takes Dual-Pol HH-VV Stripmap Test Site Location: OP InSAR Mode: Bistatic Temporal Baseline: 0.?sec Vertical Wavenumber:275m Max Min

11 First Bistatic Dual Pol-InSAR Data Takes Dual-Pol HH-VV Stripmap Test Site Location: OP InSAR Mode: Bistatic Temporal Baseline: 0.?sec Vertical Wavenumber: 0.1m 0 [m] 5

12 Krüger National Park Savanna forest Single trees no closed canopy Tree heights up to 20m

13 Krüger National Park 0 [m] 6 0 [m] 30 Amplitude HH Coherence HH DEM ( m) Dual-pol: / HH-VV, Incidence: 40deg, kz=0.1

14 TanDEM-X: Dual-Pol InSAR: First Bistatic Data Takes Test Site: Wallerfing, Germany

15 TanDEM-X: Dual-Pol InSAR: First Bistatic Data Takes 0 [m] 10 Test Site: Wallerfing, Germany

16 Coherence Tomography f (z) vertical reflectivity function Volume Coherence γ~ Vol (f(z)) e ik z z o h v o h v o f(z) e ik z z f(z) dz dz f(z) f(z) A 0 A 1 A 2 A 3 A 4 γ~ Vol (f(z)) e ik z z o h v o h v o f(z) e ik z z f(z) dz dz Fourier Legendre Series: h v 0 h v 0 f(z' ) f(z) n e ik z hv f(z) dz 2 z hv dz e 2 a P (z' ) n n 1 1 k zh i 2 v 1 1 (1 f(z' )) where (1 f(z' )) dz' a n e k zh i 2 2n v 1 z' dz' f(z' )P (z')dz' n

BioSAR II: Krycklan, 2008 Sweden Sweden Test site:

Up to 220t/ha - (Mean ~ 90t/ha) Pine, Spruce, Birch &

17 BioSAR II: Krycklan, 2008 Sweden Sweden Test site: Krycklan, - Forest type: boreal - Tree Species: Pine, Spruce, Birch Forest heights: Up to 30m - (Mean ~ 17m) - Forest Height: ~ 30m - Terrain: Hilly Biomass range: Up to 220t/ha - (Mean ~ 90t/ha) Pine, Spruce, Birch & Mixed stands. Hilly Terrain / Steep local slopes Uniform structure

18 Descending HH Half Baseline: kz=0.1 Full Baseline: kz=0.2

19 PCT Profiles A 0 A 1 A 2 f(z) 0 30

20 PCT Coefficients: Ascending Single Baseline Coeff: Half vs Full Baseline A 1 A 2 f(z) A 0 A 1 A 2 Dual vs Single (Half Baseline) Dual vs Single (Full Baseline) A 1 A 2 A 1 A 2

21 PCT Coefficient Maps A 1 A A 3 Amplitude / Lidar Heights

22 PCT Coefficients A 1 10m 15m Height versus A1 plot A 2 20m 25m Height versus A2 plot

23 Summary Volume decorrelation effects at X-band over a variety of forest conditions combined with Pol-InSAR sensitivity (coherence & phase center location). - Classification; - Forest Height; - Structure characterisation. Data quality and Mission Scenario allow the scientific investigation of Pol-InSAR: Dual-Pol (HH&VV or HH&HV) Standard Mode Quad-Pol (Campaign): performance critical at large look angles (>40deg) Baseline diversity: - 2 Baselines Globally (Single-pol, kz=.13 and kz=.17); - Alternating bistatic mode; - Incidence angle diversity (Dual-/Quad-pol). The challenge: To understand & model high resolution X-band Pol-InSAR data, invert physical parameters and generate information products.

24 Exploring the Potential Pol-InSAR Techniques at X-Band: First Results & Experiments from TanDEM-X K. Papathanassiou, F. Kugler, J-S. Kim, S-K. Lee, I. Hajnsek Microwaves and Radar Institute (DLR-HR) German Aerospace Center (DLR)

TanDEM-X: Mission Status & Scientific Contribution

TanDEM-X: Mission Status & Scientific Contribution Irena Hajnsek 1/2, Gerhard Krieger 1, Kostas Papathanassiou 1, Stefan Baumgartner 1, Marc Rodriguez-Cassola 1, Pau Prats 1, Maria Sanjuan Ferrer 1, Florian