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Scattering matrices recorded with bistatic polarimetric radar systems can be described using bistatic Huynen parameters. These parameters not only depend on the properties of the target, but also on the bistatic angle. Quasi-monostatic radars as well as many bistatic radars exhibit configurations limited to small bistatic angles between receiver and transmitter. Therefore it is possible to apply a small-angle approximation to some of the Huynen parameters. In this paper the impact of this approximation on scattering matrices is investigated and the consequences of the approximation are discussed. From the discussion follows that for small bistatic angles the scattering matrix can be interpreted and handled like a monostatic scattering matrix apart from a perturbation along its antidiagonal. The findings are supported by simulation results.

The radar cross section (RCS) of an object is a reflectivity pattern that depends on geometrical features like incident and scattered angle, target features like shape or surface roughness and system parameters like frequency and polarization. Fully polarimetric ultrawideband (UWB) sensors exploit both last mentioned dimensions to understand the backscattering behavior of an object. The knowledge gained from RCS analysis can be used in applications related to multi target environment characterization. This publication introduces a procedure for discriminating polarimetric object RCS by investigating target features in time and image domain. For the purpose of a model based interpretation of an environment, polarimetric radar measurements are utilized for clustering specific polarimetric backscattering signatures. The clustering approach is embedded in an iterative algorithm that analyses the polarimetric radar data regarding dominant backscattering components.

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