An underwater acoustic communication method based on ultra-wideband signal imitating dolphin tick sound

Abstract

The invention discloses a dolphin click simulating underwater acoustic communication method based on an ultra-wideband signal. At a transmitting end, the ultra-wideband signal which accords with the time domain characteristic and the frequency domain characteristic of a dolphin click signal is generated. Time-hopping pulse position modulation (TH-PPM) is used for performing information modulation on the ultra-wideband signal, thereby obtaining a bionic communication signal. An original whistle signal is added in front of the bionic communication signal as a synchronization signal, thereby forming a transmitting signal frame. At the receiving end, the original position of the bionic communication signal is defined through synchronization signal correlation; and a bionic communication signal is extracted and demodulated, thereby realizing information decoding. The bionic communication method does not depend on a real dolphin yawp signal in modulation process, thereby realizing convenient application. The ultra-wide signal accords with the time domain characteristic and the frequency domain characteristic of dolphin click sound and therefore has high concealing performance.

Description

technical field [0001] The invention belongs to the field of underwater acoustic communication, and in particular relates to an underwater acoustic communication method based on an ultra-wideband signal imitating the click sound of a dolphin. 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 under...

AI Technical Summary

Problems solved by technology

However, both of these two communication systems use real dolphin call signals for communication, and the communication effect depends on the quality of the samples used, which is inconvenient to apply

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