Dolphin whistle imitated underwater acoustic communication method based on time-frequency spectrum extension and retraction

Abstract

The invention belongs to the field of bionic underwater acoustic communication, and particularly relates to a dolphin whistle imitated underwater acoustic communication method based on time-frequency spectrum extension and retraction. The method provided by the invention comprises the steps of transforming binary information into decimal information; extracting a time-frequency spectrum profile curve of real dolphin whistle signals; carrying out power amplification on frame signals, and then sending the amplified frame signals to an underwater acoustic channel through a transducer; receiving the signals through a hydrophone; and carrying out synchronization on the received signals. The technical scheme provided by the invention has no special requirements for characteristics and the quantity of selected real dolphin whistle signal samples, so that the dolphin whistle signal samples can flexibly selected according to a sea area to which underwater acoustic communication is applied and specific communication requirements. A mode of enabling the time-frequency spectrum profile curve of the real dolphin whistle signals to extend and retract is adopted in information modulation, and synthesized coded signals conform to characteristics of the dolphin whistle signals, thereby having very high concealment performance.

Description

technical field [0001] The invention belongs to the field of bionic underwater acoustic communication, and in particular relates to an underwater acoustic communication method based on time-spectrum stretching and imitation of dolphin whistle. Background technique [0002] In recent years, with the development of modern detection technology, concealment requirements have been put forward for underwater acoustic communication. The traditional covert underwater acoustic communication methods mostly start from the perspective of low signal-to-noise ratio, and hide the signal in the background noise of the ocean to achieve the effect of covert communication. However, this method reduces the communication distance at the same time. Different from the concealed underwater acoustic communication with low signal-to-noise ratio, the bionic concealed underwater acoustic communication adopts the method of bionic camouflage, and uses the biological signal naturally existing in the unde...

AI Technical Summary

Problems solved by technology

However, under these two communication systems, in order to reduce the bit error rate of correlation decoding at the receiving end, there is a correlation requirement between the selected whistle signals, and the demand for whistle signal samples is large

Chinese patent specification CN104217722A discloses a dolphin whistle signal time spectrum profile extraction method, but it is not applied to underwater acoustic communication

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