一种时频空联合探测方法

A combined time-frequency-space detecting method

提出了一种时频空联合探测（ＣＴＦＳＤ）方法。它利用合成孔径声呐（ＳＡＳ）数据，先做匹配滤波，再做时频滤波，时频滤波是该方法的核心，巧妙地完成了声特性提取功能。空间处理是非相干合成孔径处理。这种新方法（ＣＴＦＳＤ）的检测能力优于ＳＡＳ。ＣＴＦＳＤ是探测沉底或掩埋目标的一种新方法。

The paper proposes a method that is based on a combined time-frequency and space-time processing of the data from the dynamic lake trials on synthetic aperture sonar (SAS). After range compression, we used time-frequency processing to improve as much as possible the signal-to-reverberation ratio. The time-frequency processing is the kernel of the method, it extracts the characteristics of targets skillfully. The space-time processing is incoherent accumulate processing. The proposed method can detect small targets more clearly than SAS do, but the images of small targets are poorer than that of SAS. CTFSD method is a new technique to detect both proud and buried targets.