2008 hanoi satellite radar interferometry

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Satellite Radar InterferometryPart 1, Background interferometry

Doris course, 3-7 February 2008, Hanoi, Vietnam

Ramon HanssenDelf t University of Technology (TU Delf t )The Netherlands

Delft I nstit ut e of Earth Observation and Space Systems


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Aim

Provide a background in radar interferometry,including practical data processing using Doris.

Participants: Ranging from novices to expert users

1. Software users with limited theoretical

background (what does the software dointernally?)

2. Users with significant theoretical knowledge,but limited knowledge of software (e.g. Doris)


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Level of participants

Interferometry experience?

Complex data?

Phase differences? Ambiguities?

Operating systems: MS-Windows, Macintosh,Linux/Unix

Live-USB


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(2+i6)*(3+i7)


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Contents Radar InterferometryDay 1 InSAR introduction (F. Sarti) InSAR basics (R. Hanssen)

Doris Practical setup (R. Hanssen)Day 2 InSAR 1. (F. Rocca) Doris Practical 1 (Installation Linux/ Doris) (R. Hanssen)Day 3

InSAR 2. (F. Rocca) Doris Practical 2 (Small baseline deformation) (R. Hanssen)Day 4 InSAR 3. (F. Rocca) Doris Practical 3 (Topographic pair) (R. Hanssen)

Day 5 InSAR 4. (F. Rocca) Doris Practical 4 (Differential InSAR) (R. Hanssen)


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SAR SLC observations

SLC: Single-Look Complex data

Single-look: no averaging, finest

spatial resolution

Complex: both real and imaginary(In-phase and quadrature phase)

stored

AmplitudePhase

Uninterpretable, due toscattering mechanism

Coherent imaging


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Radar Interferometry


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Example in 2D: interferogram


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Range

Expressed as phase

(radians)


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Range

Expressed as

integer cycles +fractional phase

frac


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Reference phase (flat earth phase)

Ellipsoid

-

+

Topography will add

variation to the flatearth phase


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Amplitude

Reference phase

RADAR INTERFEROMETRIC OBSERVATIONS


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Phase-range relationship


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Phase-height relationship(Far-field approximation)

Ellipsoid

Topographic phase is (inversely)scaled by the perpendicularbaseline!


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Amplitude

Reference phase

Topographic phase

RADAR INTERFEROMETRIC OBSERVATIONS


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Height ambiguity

Height difference related to 1 phase cycle:

0

100

200

300

400

500

20

100

180

260

340

420

500

580

660

740

820

900

Perpendicular baseline [m]

Heighta

mbiguity[m]


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Baseline dependency, height ambiguity

Bperp 173 m, Bt= 1day Bperp 531 m, Bt= 1 day

H2pi=4 5 m H2pi=1 6 m


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Deformation

measurements

C ti l I t f t B th k 26/12/2003


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Conventional Interferometry: Bam earthquake 26/12/2003

2008 hanoi satellite radar interferometry

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