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- W2079423191 abstract "In certain cases, underwater backscattering of sound by targets in a caustic field associated with reflection from curved surfaces takes the form of a diffraction integral over the product of a wavefront amplitude and a phase factor. The phase factor can be expressed using the relative return times of a transient pulse (B. Dzikowicz, Ph.D. dissertation, Washington State University, Pullman, WA, 2003). In a homogeneous, isotropic medium, the variation in ray return angles can be related to geometrically predicted ray amplitudes at the receiver. These geometrically predicted amplitudes as a function of target position can be recovered from the diffraction integral by using the results of a uniform approximation [C. Chester, B. Friedman, and F. Ursell, Proc. Cambridge Philos. Soc. 53, 599–611 (1957)]. The result is that for targets near an Airy caustic, the coefficient of the Airy function amplitude factor depends on the derivatives of ray return angles. The improvement using this technique for two merging rays (a target at an Airy caustic) versus a simpler model (where the aforementioned coefficient is constant) will be discussed and compared to experiment for the single-bounce echo. [Work supported by ONR.]" @default.
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- W2079423191 date "2003-10-01" @default.
- W2079423191 modified "2023-09-24" @default.
- W2079423191 title "Uniform approximation method for backscattering of sound from a target in a caustic field" @default.
- W2079423191 doi "https://doi.org/10.1121/1.4780885" @default.
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