INVERSION OF SYNTHETIC APERTUR,E R,ADAR (SAR) - MSpace ...

The objectives of this thesis rnay be subdiviclecl into trvo topics: (1) pleliminary
development of an invelsion apploach fol SAR signal data by applying
the Born (fir'st) approxirnation; ancl (2) investigation and cleveloprnert of
enhalceme¡rt techliques of SAR image data fol geological applications.
L.1 Inversion of SAR Data
The heart of SAR technology development has been the SAR signal processing
techniques which enable a short antenna to be synthesized into a much
longer antenna, ancl consequently to achieve high lesolution in along-track
or azirnuth clir¡ension.
A sclrenratic SAR geometly is shown in Figure 1,1. The d,epression angle
is the angle at the radal from the horizontal in lange direction to the nidline
of the scan; note this is not necessarily the mid-point acloss the swath
on tlre glound. The look angle (ot off-nadir angle) is the completnentaly
angle to the depression angle. The in cide¡¿ce angle is the angle which the
far beanr makes *'ith the vertical at the terrain sulface. The squint angle'ts
the algle betrveen the along-track dilection and the gt'ourcl tange direction.
hl tbe side-looking radar case, the squint angle becomes equal to 90". The
slant range and. ground, rznge are illustlated in Figule 1.2. The slant range is
cletennined fi'orn the louncl-tlip travel tir¡e between antenna ancl a scatterer
on the glound, ivhich is the system's nteasuLements. In the rest of the thesis,
the telrn "range" without specifying "slant" oL "glound" repleseuts "slant
tangett ,