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Time-Frequency Processing of Scattering Responses from a Dielectric Sphere
Masahiko NISHIMOTO Hiroyoshi IKUNO
IEICE TRANSACTIONS on Electronics
Publication Date: 2001/09/01
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Electromagnetic Theory
wavelet analysis, wavelet transform, time-frequency analysis, scattering process,
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Scattering responses from a dielectric sphere are analyzed in the time-frequency domain by using two types of wavelet transform in order to reveal the scattering mechanisms. In the resulting time-frequency displays, various scattering processes including reflection, refraction, and diffraction can be clearly resolved and identified. The delay time of each scattering process agrees well with that obtained by the ray theory. Furthermore, the natural frequencies that are not easy to extract by the conventional Fourier analysis can be extracted.