Study of dispersive and anisotropic scatterers behavior in radar imaging using time-frequency analysis and polarimetric coherent decomposition

A fully polarimetric time-frequency analysis is proposed for radar imaging (SAR, ISAR) to analyse the anisotropic and dispersive behavior of deterministic target illuminated by a radar sensor. This method is based on the hyperimage concept which describes the response of scatterers as a function of the observation angle, of the emitted frequency and of the polarimetric decomposition. New polarimetric hyperimages point out a non-stationary behavior which can be interpreted by the physics parameters of the target (geometrical shape, relative orientation). They allow a best understanding of the scattering mechanisms. Basic statistics extracted from these representations show that they are tools to detect non-stationary scatterers and are the first step to a new classification.