L-band PS analysis: JERS-1 results and TerraSAR - L predictions
Fabio Rocca(1) and Fabrizio Noval(2)
Politecnico di Milano,
Via Ponzio, 34/5,
(2) TRE, Via V. Colonna 7, 20149 Milano, Italy
The Permanent Scatterers (PS) technique has already been applied
successfully to multi-temporal series of C-band data (ERS and RADASAT).
PS are radar targets only slightly affected by temporal and geometrical
decorrelation that allow a reliable and high-quality monitoring of
surface deformation phenomena (e.g. seismic faults, volcanoes, urban
subsidence, slow landslides, etc.) by means of SAR interferometry.
In order to estimate the capabilities of an L band system like TerraSAR-
L, the application of the PS technique to the L-band data-set acquired
by the Japanese satellite JERS-1 is first described. During its
operating time (1992-1998), JERS-1 acquired great quantities of data,
particularly over Japan, representing today a precious source of
information that is complementary to the ESA-ERS archive, thanks to the
different characteristics of the SAR system. In fact, L-band allowed a
deeper penetration over vegetated areas with respect to the C-band;
however, the limited attitude control of the platform makes the use of
JERS-1 data for interferometric application more challenging.
The results obtained for two different areas in Japan will be
presented, and they will be compared with the processing of an ESA-ERS
data-set acquired over the same areas. This will allow to assess the
impact of different wavelength/polarisation/incidence angle on the PS
distribution, and to draw the guidelines for a synergistic use of the
data collected by different SAR systems.
In turn, this proves the interest for longer wavelength SAR sensors;
the trade offs between deeper vegetation penetration and lower motion
sensitivity will be analysed, and favourable conclusions on the
opportunity of L band use will be drawn, based on this experience.
Keywords: ESA European
Space Agency - Agence spatiale europeenne,
observation de la terre, earth observation,
satellite remote sensing,
teledetection, geophysique, altimetrie, radar,
chimique atmospherique, geophysics, altimetry, radar,