An FFT-based coarse scan plus 1D beamforming narrows the search region so a refined 2D-MUSIC stage localizes near-field sources with much lower complexity than full 2D-MUSIC.
3-d near field source localization using second order statistics,
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FFT-Enhanced Low-Complexity Near-Field Super-Resolution Sensing
An FFT-based coarse scan plus 1D beamforming narrows the search region so a refined 2D-MUSIC stage localizes near-field sources with much lower complexity than full 2D-MUSIC.