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L-band PS analysis: JERS-1 results and TerraSAR - L predictions

Fabio Rocca(1) and Fabrizio Noval(2)

(1) Politecnico di Milano, Via Ponzio, 34/5, 20133 Milano, Italy
(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.


Full paper

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, atmospheric chemistry