Detection of Material Dispersion Using SAR

Abstract:
Measurement of material dispersion, i.e., the dependence of reflectivity upon frequency of electromagnetic wave, can provide useful information about the target material. Extension of the standard matched filtering approach to the response delay “coordinate” is complicated by the range-delay ambiguity of imaging and limited angular coherence of the target. We suggest to recover the above dependence in a simple parametrized form retaining the first two terms of the Taylor expansion of reflectivity in frequency. Corrections to the point spread function are computed, and possibilities of parameter extraction from image data are discussed.