N. Veneziani
G. Guerriero
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Progress Report on
SAR
Data Processing at IESI-CNR and Physics Department of the University
of Bari, Bari, Italy
The research activity of the two coordinate units at IESI-CNR and Physics Deptartment
of the University of Bari, Bari, Italy, is mainly addressed to
SAR
Interferometry
(INSAR).
In the last year, the following actions have been developed:
- implementation of software modules for INSAR techniques, and their test on real
and simulated
SAR
data (in this phase, the ESRIN
ERS-1
INSAR Reference Data Set on Gennargentu (Sardinia, Italy) has been used);
- verification of phase preserving performance of the Italian Space Agency
(ASI) X-SAR processor, by interferogram extraction from X-band data taken
at the Mt. Etna interferometric test site during the second
SIR-C/X-SAR
mission.
- sub-aperture Doppler rate estimation by analysis of Wigner-Ville joint time- frequency distributions of automatically selected azimuth lines.
The following data sets from the second
SIR-C/X-SAR
mission have been required
through ASI, and received on the last December:
- single look complex interferometric pairs of images on Mt. Etna, Sicily (Italy),
in L-band, C-band, and X-band (new ASI processing), for a multifrequency
INSAR experiment;
- X-SAR raw data on Oberpfaffenhofen (Germany), and related Shuttle PATH product, for a motion and attitude compensation experiment.
A presentation has been submitted to
IGARSS
'96 Int. Symp., concerning the
phase unwrapping problem in the presence of phase inconsistencies due
to noise and topography. A single spectral band of the available
SIR-C/X-SAR
data on Mt. Etna will be exploited in order to produce experimental results of our unwrapping
technique.
Authors and title of this presentation should be: M. T. Chiaradia, L. Guerriero,
G. Pasquariello, A. Refice, and N. Veneziani, "Absolute Phase Determination
in
SAR
Interferometry."
Moreover, a technical note is in preparation, concerning a preliminary analysis and
the characterization of a pseudo-differential approach to the multifrequency INSAR.
The aim of this note is to define the outlines of an experiment based
on the
SIR-C/X-SAR
multiple frequency data of Mt. Etna, such that the whole data
set may be exploited in an integrated way during the phase unwrapping and the
elevation map computation.
With regard to the
SIR-C/X-SAR
system, in the near future the following activities
will be developed. In order of priority:
- experimentation on single and multifrequency INSAR techniques, aimed to
optimize the phase unwrapping procedure;
- analysis and compensation of different motion conditions, induced by platform
attitude changes, between the two radar antennas of a spaceborne bistatic INSAR
instrument (in reference to the interferometric
SIR-C/X-SAR
mission foreseen).
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