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Estimating complex spectra is a widespread operation in signal processing and in some applications a high dynamic range, which requires low sidelobe levels, is essential. For data with uniform sample spacing, weightings are commonly applied to Fourier transforms to suppress sidelobes, increasing dynamic range at the cost of some loss of spectral resolution. However, if a significant proportion of...
A guaranteed occurrence when using Acoustic Micro Imaging, the phenomena called Edge Effect is not clearly understood. The widely accepted reliance on scatter theory to explain edge effect is challenged in this study. The edge effect of solder joints is investigated using finite element modeling. Simulation strategies for reducing computational load are proposed. A methodology to characterize acoustic...
Presented in this paper is a method for following a moving target with a mobile platform derived from a vector field navigation algorithm. A navigation method that took the position and heading of a waypoint as its defining parameters was modified to suit the needs of creating a target following algorithm. This algorithm will be shown to successfully be able to control a vehicle to follow a known...
We consider the problem of short division -- i.e., approximate quotient -- of multiple-precision integers. We present ready-to-implement algorithms that yield an approximation of the quotient, with tight and rigorous error bounds. We exhibit speedups of up to 30% with respect to GMP division with remainder, and up to 10% with respect to GMP short division, with room for further improvements. This...
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