alos-palsar pol- & pol-insar data calibration...

Microwaves and Radar Institute / Microwaves and Radar Institute / PolPol -- InSAR Research Group InSAR Research Group

ALOS-PalSAR Pol- & Pol-InSAR Data Calibration Analysis

K.P. Papathanassiou, L. Marotti, F. Kugler, R.Z. Schneider & I. Hajnsek

German Aerospace Center (DLR) Microwaves and Radar Institute (DLR-HR)

VU 2 > Autor NameMicrowaves and Radar Institute > 30.05.2006


Wavelength 0.236 m

Chirp Bandwidth 14 MHz

Peak Transmit Power 2 kW

Duty Cycle 3,5 % (7 % / 2)

Noise Figure 4 dB

Antenna Size (Tx , Rx) 8.9 m x 3.1 m

Quantisation 5 bit (BAQ)

Launch date Januar 2006

Weight 4000kg

Solar Power ~7Kw@EOL

Orbit Sun Synchronous

Altitude 691.65 km

Revolution 14+27/46

Yaw steering ON

Inclination 98.16 degrees

Attitude error 0.4e-4°



ALOS-PalSAR: Quad-Pol @ 21.5° / Scene ID: ALPSRP021270960-70-80 / ALPSRP027980960-70-80 / ALPSRP034690960-70-80 A

03.08.2006

Cycle 6

18.09.2006

Cycle 7

18.06.2006

Cycle 5

60Km



CAL-VAL CAMPAIGN

Two Test Sites: Oberpfaffenhofen & Traunstein

May until November 2006

Total of 40(!) acquisitions

Deployed Reference targets:

6 x 3m trihedral reflectors

2 x 1.5m trihedral reflectors

2 x 1m dihedral reflectors

2 x L-band transponders



ALOS-PalSAR: Quad-Pol @ 23.5° / Scene ID: ALPSRP022952620-30-40 / ALPSRP029662620-30-40 D

30.06.2006

15.08.2006

ALPSRP022952620 ALPSRP022952630 ALPSRP022952640

SN

R H

V C

HA

NN

EL

Cycle 5

Cycle 6



ALOS-PalSAR: Quad-Pol @ 21.5° / Test Site: ALPSRP031293760 ALPSRP032753670

Cycle 6

Cycle 7



ALOS-PalSAR: Quad-Pol @ 21.5° / Test Site: ALPSRP031293760 ALPSRP032753670



PolSAR Calibration Results Summary

X-Talk Level: -18 to -22dB >-25dB

Co-Channel Imbalance A: ~.5-1.dB ? (TbS)

Co-Channel Imbalance P: ±5° to 10°

SNR Forest: ~16dB γ=0.9-0.95

SNR Surfaces: 0dB γ=0.5

Faraday Rotation: 0° to 5°



ALOS-PalSAR PolSAR ResultsCycle 7

Cycle 6

Cycle 8

Fo

rest

Co

nF

ore

st B

road

Ag

ricu

ltu

reB

are

Fie

ld



ALOS-PalSAR InSAR Results

Cycle 5-6

Cycle 6-7

Cycle 5-7



Red: Dihedrals

Green: Dipoles

Blue: Flat Plates

Coherent Scatterers

Amplitude Entropy Alpha angle

06.2006




Cycle 5-6

Cycle 6-7

Cycle 5-7




Cycle 7-8

Sep-Nov

B~700m



ALOS-PalSAR Pol-InSAR Results







Stand 1 Stand 2

Estimated Height: ~34m ~37m

Reference Forest Height: ~20-25m ~20-25m

Temporal Decorrelation: ~0.65-0.75



Comments & Conclusions

ALOS PalSAR Quad-Pol Quality is excellent and within the Specs.

CAL/VAL campaign successfully performed.

Scientific value on the temporal evolution of polarimetric properties of scatterers.

It is important to secure the acquisition of Quad-pol time series on selected TS sites.

ALOS PalSAR InSAR Quality is almost excellent – Baseline Control & T-deco.

Pol-InSAR applications limited due to the InSAR limitations of the system.

Pol-InSAR (quantitative) product generation only on opportunity basis.

Successful demonstration of Pol-InSAR applications is encouraging.

Methodology development for facing temporal decorrelation effects is ongoing.



ALOS–PalSAR Pol-INSAR Test-Sites

Helsinki Finland Boreal Forest

Traunstein Germany Temperate Forest

Ebersberger Forst Germany Temperate Forest

Injune Australia

Belize Belize Tropical Forest

Borneo Indonesia Tropical Forest


ALOS-PalSAR Pol- & PolInSAR Data Calibration Analysis

K.P. Papathanassiou, L. Marotti, F. Kugler. R.Z. Schneider & I. Hajnsek

German Aerospace Center (DLR) Microwaves and Radar Institute (DLR-HR)

alos-palsar pol- & pol-insar data calibration...

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