Angle-and-time-domain gating technique for time-reversal MUSIC imaging

In this study, we propose a two-dimensional (angle-and-time-domain) gating technique accompanied with the fast Fourier transform (FFT) and spatial FFT processing. The concept of the spatial FFT has been proposed and considered as a beamforming technique. By utilizing the weight adaptation, the beamforming technique can estimate coarse directions of arrival. Therefore, if we suppress unwanted signal(s) in the angle domain, we can overcome the above obstacle in the same scattering configuration. That is, since the proposed gating technique extracts targets in the two-dimensional region, we can expect the improvement of imaging function.