Directional bionic underwater communication method using a parametric acoustic array and recursive filtering

•The system that combines a bionic signal with a parametric array is also proposed for the first time, realizing directional communication on the basis of bionic communication. It has certain application value for underwater covert communication.•For the modulation algorithm of the parametric array, the Kalman recursive filter modulation algorithm proposed in this paper is original. This is the first publication of the algorithm. The algorithm has low computational complexity and is conducive to real-time modulation. More importantly, it can suppress noise in the input signal and reduce its impact on the modulation effect.•The pool experiment verifies the feasibility and advantages of the method proposed in this paper.