Abstract
In the field of target structural acoustics, the backscattered signal is determined by the structural properties of the object and acoustic interaction phenomena. Traditionally, information about the target is obtained by observing the impulse response (time domain) or the frequency response (transfer function). For a detailed study of the scatterer’s structure, a joint time-frequency representation can reveal some inherent features that do not stand out in a single domain representation. The generalized time-frequency representations (GTFR) can provide a good estimate of the spectral components in the signal, and resolve the starting time of these spectral peaks in the time-frequency plane. The GTFR is characterized by a kernel, and the properties of a particular representation are determined by the constraints imposed on its kernel. Here, the cone-shaped kernel is compared to the spectrogram and Wigner distribution, and shown to provide and improved tool for understanding the backscattering phenomena. The method is illustrated with data from a cylindrical shell in water.
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