Method for detecting and judging objective by epeiric sea low frequency coherent vector sound field interference structure

The invention provides a method for using a shallow-sea low-frequency coherent vector sound field interference structure for detecting and identifying a target. The first step is that the Fourier transformation of the sound pressure and the vibration velocity signal is respectively carried out; the second step is that the Fourier transformation of the vector signal is conjugated; the third step is that the Fourier transformation of the sound pressure signal is multiplied by and the female court attendant of the Fourier transformation of the vector signal; the fourth step is that the real part or the imaginary part is obtained; the fifth step is that the judgment of the positive or negative sign is carried out; and the sixth step is that the depth classification of the target is given according to the judgment of the positive or the negative sign of the fifth step. The method develops the work against the passive detection of the remote target and the target depth judgment, in particular to the application purpose of the target depth judgment. The method has important application prospect in comprehensive marine monitoring, seashore early-warning system, small platform sonar, aviation acoustic buoy and other aspects.