INVESTIGADORES
EUILLADES Leonardo Daniel
artículos
Título:
SBAS-Based Satellite Orbit Correction for the Generation of DInSAR Time-Series: Application to RADARSAT-1 Data
Autor/es:
ANTONIO PEPE; BERARDINO, PAOLO; MANUELA BONANO; LEONARDO D. EUILLADES; RICCARDO LANARI; SANSOSTI, EUGENIO
Revista:
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
Editorial:
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Referencias:
Lugar: New York; Año: 2011 vol. 49 p. 5150 - 5165
ISSN:
0196-2892
Resumen:
We present an algorithm aimed at correcting satellite
orbit information for the generation of differential SAR interferometry
(DInSAR) deformation time-series. Our approach exploits
small baseline differential interferograms, to preserve their spatial
coherence, and is directly compatible with the Small BAseline
Subset (SBAS) DInSAR technique. In particular, the algorithm
investigates the differential phase gradient directly computed from
the wrapped interferograms, and is focused on the estimation
of the perpendicular baseline and of the parallel baseline azimuth
rate components, separately performed along the range
and azimuth directions, respectively. Starting from the estimations
carried out on the interferograms, we then retrieve the orbit correction
associated with each SAR acquisition of our time-series by
solving a system of linear equations via the SVD method, extending
the SBAS inversion concept also to the orbit estimation problem.
Key application of this technique is the generation of deformation
time-series from interferometric sequences of RADARSAT-1 SAR
acquisitions which are available for several areas in the world,
but are characterized by significantly low accuracy of the orbit
information. The presented results, obtained by processing a
data set consisting of 33 RADARSAT-1 images of Big Island at
Hawaii, show that we may retrieve DInSAR time-series with subcentimeter
accuracy, thus confirming the effectiveness of the proposed
technique.