Interferometric synthetic aperture radar (InSAR) is a very effective technique for measuring surface deformation, but the
temporal and geometrical decorrelation and atmospheric disturbances can strongly compromise the accuracy of the
results. Persistent scatterer InSAR (PS-InSAR) overcomes the decorrelation and atmospheric disturbances problem by
identifying resolution elements whose echo is dominated by a single scatterer in a series of interferograms. The results
obtained by PS-InSAR technique are not the field deformation information but persistent scatterers deformation. In this
paper, PS-InSAR is used to investigate surface deformation caused by landslide hazards in Hanyuan reservoir
resettlement, China. The subsidence map derived from Envisat ASAR data between May 2008 and Oct 2009 reveals the
spatial extent of the deformations and subsidence velocity. The experimental results show that there are instable areas
which are located in the Middle of new Hanyuan county. The average deformation rate of the instable areas is over -
20mm. The Upper right and Lower left of new Hanyuan county are relatively stable.
Satellite orbital state vectors are required not only to determine the baseline parameters, the coarse offset in
registration step but also to remove the phase of the flat Earth and geocode the InSAR products to WGS84. The
quality of orbit plays an important role in InSAR products, i.e. DEMs and deformation maps. The orbit
inaccuracy in along-track, radial and across-track directions is transformed into a noise baseline vector. Baseline
errors are introduced into the InSAR products in the Flat-Earth phase subtraction and topographic phase
subtraction processing steps. Under the transformation, the influences of the orbit inaccuracy in the two InSAR
processing steps and the InSAR products are analyzed. According to the error propagation theory, we built the
relationship between orbit errors and InSAR products. The influence of orbit errors caused by imprecise
topography subtraction is small in comparison to imprecisely subtracted flat-Earth phase. The propagation of
orbit errors to deformation maps is derived, revealing that the influence of orbital error on deformation is much
lower than that on height and only sub-millimeters.
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