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The MUSIC(MUltiple SIgnal Classification) method with high resolution is typically used to estimate far-field source bearing. When the source is located in the near-field, it can be applied by compensating the time-delay difference and the magnitude attenuation using spherical wave rules. However, it has a problem with complex calculations, such as eigen-decomposition of a matrix. In this paper, we...
Focused beamforming technology is a high precision passive localization algorithm which is mostly applied in near field. In this algorithm, the received signal is compensated by spherical wave based on different direction and distance in the measurement area in order to obtain the spatial distribution of noise sources. This technology can be used to detect noise distribution of ships and some engines,...
We propose a segment focusing compressed sensing algorithm which is high-resolution, low complexity and uses inherent sparsity in the scene of sonar imaging. We demonstrate on simulation and through poor experimental data that Fast Fourier Transform (FFT) beamforming and the proposed algorithm can distinguish the targets generated by the direct path target scattering echo signal. But FFT beamforming...
High accurate ranging for near-field sources requires that the array aperture should be long enough, especially for the weak underwater acoustic signal with very low frequency. The passive synthetic aperture technique can increase the array aperture artificially by the motion of physical array and signal processing. This paper applies it to the near-field ranging with focused beamforming, which provides...
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