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This paper presents the Intrinsic Mode Function Time Delay Method (IMFTDM) which is based on Hilbert Huang Transform (HHT) and its application in beamforming. The IMFTDM can delay the broadband Intrinsic Mode Function (IMF) by arbitrary time accurately. And in this work, the IMFTDM is performed using the simulated and real data in beamforming to test its performance. The results show that it can improve...
For a Multi-Beam Echo Sounder (MBES) operating in very shallow water environments or close to seafloor, near-field beamforming shall be used to estimate the direction and range of the backscattering sources along the bottom. The most common beamforming method is the so-called weight-delay-sum (WDS) beamformer. In this paper, we present an approximation method to calculate time delays between individual...
Array-based bearing estimation is commonly used in many sonar/radar applications. Typical performance of a practical implementation displays a threshold behavior, that is, below certain signal-to-noise ratio (SNR) the estimation mean- square error increases dramatically. The error increase is known to be largely attributed to sidelobe ambiguities in signal field correlation along with estimation bias...
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