Abstract. The paper
presents the results of ALOS PALSAR data processing for a dataset acquired over
the territory of Moscow region. In order to obtain stable measurements in the
presence of high temporal decorrelation the Persistent Scatterers
technique was used. We have conducted experimental studies of the potential and
restrictions of PS technique applied to long temporal series of 29 SAR images
obtained during 18.06.2006 - 14.02.2011 over the Moscow city territory by ALOS PALSAR
instrument (L-band SAR), 23,6 cm wavelength).
One of the important
results obtained was the discovery of four-fold reduction of the PS spatial
density for urban territory in L-band compared with C-band SAR like as ENVISAT
ASAR. The effect may be explained by the decrease of radar cross-section of
corner-like scatterers in urban territories at longer wavelengths, their
respective fading and subsequent decrease of PS density.
The dependence of PS history of displacements for the targets
spread across the test territory in the case of varying length K of SAR images time
series was studied also. It was discovered that for K=27, 28 č 29 the velocities of PS
displacements as well as residual heights being measured are practically the
same.
To study the problem of the atmospheric phase distortions we
analyzed histories of PS displacements derived using the technology of
Atmospheric Phase Screen, which is calculated by SARScape software in a
procedure of spatial/temporal filtering of differential interferograms from the
data stack. The decrease of the PSs displacement histories correlation level
was found to be typical for the PSs spaced at the distance larger than 1.5 km.
At the same time high correlation level of displacement histories of densely
located PSs leads to the assumption that significant amount of residual phase
distortions may be associated with inaccuracy of the recovery of low-frequency spatial
component of atmospheric phase screen models.
Key words: persistent
scatterers technique, PS, SAR, ALOS, PALSAR, atmospheric phase screen,
APS, DEM, SARscape.
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