Youngmin Choo

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We present a time delay estimation method for sparse translation-invariant signals, off the grid. We enforce sparsity by imposing penalties based on an atomic norm to consider signals in a continuous domain. Our formulation leads to an atomic norm minimization problem. A number of recent theoretical results demonstrate that an atomic norm minimization can(More)
A striation pattern can emerge in high-frequency acoustic signals interacting with dynamic surface waves. The striation pattern is analyzed using a ray tracing algorithm for both a sinusoidal and a rough surface. With a source or receiver close to the surface, it is found that part of the surface on either side of the specular reflection point can be(More)
Range-dependence of time-varying acoustic channels caused by a traveling surface wave is investigated through water tank experiments and acoustic propagation analysis schemes. As the surface wave travels, surface reflected signals fluctuate and the fluctuation varies with source-receiver horizontal range. Amplitude fluctuations of surface reflected signals(More)
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