Dolphin click simulating underwater acoustic communication method based on time-frequency spectrum translation

Abstract

The invention discloses a dolphin click simulating underwater acoustic communication method based on time-frequency spectrum translation. At a transmitting end, the time-frequency spectrum contour curve of a real dolphin whistle signal is translated in the vertical direction for loading digital information; signal combination is performed based on a modulated contour curve for obtaining a bionic communication signal; and an original whistle signal is added in front of the bionic communication signal as a synchronization signal, thereby forming a transmission signal frame. At the receiving end, the starting position of the bionic communication signal is determined through synchronization signal correlation; multiplication filtering and Fourier transform information demodulation or modulation are performed on the received bionic communication signal, thereby realizing information decoding. The bionic communication method has no specific requirement for characteristic and number of real dolphin whistle signal sample, and the combined coding signal accords with the characteristic of the dolphin whistle signal. Therefore the dolphin click simulating underwater acoustic communication method has high concealing performance.

Description

technical field [0001] The invention belongs to the field of underwater acoustic communication, in particular to an underwater acoustic communication method based on time-spectrum shifting imitating 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 underwater acoustic environment ...

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 relatively 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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