A Novel Reverberation Mitigation Method Based On MIMO Sonar Space-Time Adaptive Processing

Multiple-input multiple-output (MIMO) sonar can provide higher spatial resolution, better reverberation mitigation ability, improved processing gain compared to phased-array sonar by waveform diversity. High degree of freedom makes fully space-time adaptive processing impractical in MIMO sonar for reasons of the high demand of secondary data for filter designing. To overcome the problem, a novel space-time adaptive processing method via iterative generalized sidelobe canceller (IGSC) is proposed. IGSC can achieve a fast and accurate estimation of space-time covariance matrix (STCM) using a few snapshots and realize near-optimal reverberation mitigation performance. Numerical experiments validate the effectiveness of IGSC.