A Reverberation Suppression Method Using Angle-Delay-Doppler Deconvolution

Much attention is attracted to the detection for the low-speed small target in a reverberation-limited environment. Exploiting the energy distribution differences between the target's echo and the reverberations (i.e., the bottom and the surface reverberations) in the angle, delay and Doppler domain, robust methods using the conventional beamformer (CBF) and a band of matched filters (MFs) associated with different Doppler shifts are proposed to suppress the reverberations. However, the CBF and the MFs suffer from low resolution and high sidelobe levels (SLLs), which is insufficient for the reverberation suppression. In order to solve this problem, a reverberation suppression method using the angle-delay-Doppler deconvolution is proposed in this paper. The Richardson-Lucy (R-L) algorithm is attached to the output of the CBF and the MFs to deblur the traditional angle-delay-Doppler output. The proposed method can effectively improve the 3-D resolution and suppress the 3-D SLLs, so as to suppress the bottom reverberations and the surface reverberations simultaneously. Simulations using respectively the CW pulse and the BPSK pulse demonstrate the effectiveness and superiority of the proposed method for reverberation suppression.