29 July 1994 Evaluation of the near-field impulse response of hard oblate spheroids in the limit of approaching a thin disk
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Abstract
Kristensson and Waterman developed a method utilizing a T-matrix approach to obtain the scattered field from a disk. The solution was obtained by setting up the equations for an oblate spheroid and evaluating them in the limit of vanishing minor axis. In this work the reflected and diffracted components of the scattered field are examined for the case of an oblate spheroid of large aspect ratio (minor axis small compared to major axis). To separate the reflected and diffracted contributions of the scattered field requires that the near-field impulse response be determined. The impulse response is obtained via Fourier transformation of the frequency response. The impulse response reduces each of the phenomena involved (reflection, diffraction, and secondary diffractions) to a set of discrete events in time which are manifested by a series of spikes, each with their own amplitude and temporal location. Evaluation of these events aid in determining the physical size and type of scatterer (target identification). The associated theory and numerical experiments are presented.
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Guy V. Norton, Jorge Novarini, "Evaluation of the near-field impulse response of hard oblate spheroids in the limit of approaching a thin disk", Proc. SPIE 2234, Automatic Object Recognition IV, (29 July 1994); doi: 10.1117/12.181047; https://doi.org/10.1117/12.181047
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