Active Sonar Reverberation Suppression Method Based on ST-phase United Processing

A Space-Time-phase (ST-phase) united processing method is proposed in this paper. It extends the processing domain form space-time to space-time-phase for separating reverberation and targets. Three sub-arrays are firstly constructed. Then, there is a phase difference between the signal parts of sub-array outputs. The value of the phase is depended on the signal arrival orientation. With the phase matching of signals, reverberation and targets can be detached. Unlike the Space-Time Aadaptive Processing (STAP), there is no need to analyze the statistical properties of reverberation and the estimation of reverberation covariance matrix can be overleaped. This will improve the adaptability in non-stationary environment. The simulation data and real data analysis prove that this method can detect out targets in a lower SNR with the compare of conventional method.