Research Article
Two-Dimensional Multiple-Snapshot Grid-Free Compressive Beamforming Using Alternating Direction Method of Multipliers
Figure 5
Loudspeaker source maps at (a), (b) 2000 Hz, (c), (d) 3000 Hz and (e), (f) 4000 Hz obtained by the two-dimensional multiple-snapshot grid-free compressive beamforming using (a), (c), (e) the IPM based SDPT3 solver and (b), (d), (f) our ADMM based algorithm. The standard uniform rectangular array with 64 microphones is employed. In each map, the reconstructed output () is scaled to dB by referring to its maximum, the reconstructed maximum referring to 2 × 10−5 Pa is labeled on the top, and the symbols ○ indicate the true DOAs but do not contain the strength information, so do in Figure 6.
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