主动声呐混响抑制的空时相三维处理方法
doi: 10.3724/SP.J.1146.2011.01146
Active Sonar Reverberation Suppression Method Based on ST-phase United Processing
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摘要: 针对主动声呐的混响抑制问题,该文将空时2维的处理方法扩展到空、时、相3个维度。该方法通过3个子阵的相位匹配,利用信号相位对信号方位的依从性,从波束域、多普勒域和相位域上分离混响与目标。区别于空时自适应处理(STAP)方法,它不需要知道信号与混响的统计特性,不用进行混响协方差矩阵的估计,从而对混响的非平稳性具有更好的适应性。仿真数据及试验数据的分析证明,该方法较之传统方法能够从更低信混比中检测出目标。Abstract: 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.
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