Acoustic intensity flux in low frequency acoustic field of shallow water and its application research

Vector signal processing is more and more widely applied to improve the signal-to-noise ratio, target orientation and location, multiple targets identification, and acoustic engineering areas such as communications. But the more direct qualitative judgments using acoustic vector signals have been ignored. The characteristics of acoustic intensity flux in low frequency acoustic field of shallow water is studied using Pekeries waveguides. The numerical and simulation results show that either the horizontal or vertical acoustic intensity flux has both active and reactive components because of the interference between the normal modes. The active component of the horizontal intensity flux can help determine whether the sound source comes into a certain distance range around the receiver. The reactive component of the vertical intensity flux can be used to tell the source's specified depth. These findings are instructive for actual underwater engineering.