A continuous-phase multi-frequency modulation underwater acoustic communication method imitating dolphin whistle

Abstract

The invention belongs to the technical field of underwater acoustic communication, in particular to an underwater acoustic communication method imitating dolphin whistle continuous phase multiple frequency modulation. The invention includes: the sending end performs continuous phase multi-frequency modulation on the information; the modulated signal is added to the time spectrum profile of the extracted dolphin whistle signal with a certain ratio coefficient to generate a synthesized whistle and obtain an imitation whistle data signal; Add the original whistle signal before the whistle data signal as a synchronization signal to form a frame of transmission signal; after the receiving end synchronizes, extract each symbol waveform; calculate the relationship between each symbol waveform and all possible signal waveforms of the symbol The correlation function realizes demodulation by judging the maximum correlation peak. The underwater acoustic communication method of the present invention imitates the dolphin whistle continuous phase multi-frequency modulation, each symbol can modulate a plurality of bit information, the communication rate is high, and the synthetic whistle signal has a high similarity with the real whistle signal, which has the advantages of Strong concealment, which can meet the needs of underwater concealed acoustic communication.

Description

technical field [0001] The invention belongs to the technical field of underwater acoustic communication, in particular to an underwater acoustic communication method imitating dolphin whistle continuous phase multiple frequency modulation. Background technique [0002] The traditional low detection probability concealed underwater acoustic communication method usually adopts the method of reducing the signal-to-noise ratio of the communication signal, and hides the communication signal in the background noise, so as to reduce the detection probability of the signal and achieve the concealment effect. Different from the traditional concealed underwater acoustic communication with low detection probability, the present invention relates to a dolphin-whistle-like underwater acoustic communication method, from the perspective of bionic camouflage, by simulating inherent dolphin whistle signals in the ocean for communication. The communication signal has a high degree of similar...

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Problems solved by technology

Chinese patent specification CN108199783A discloses a coding method for covert communication using the harmonic energy of whale calls. This method divides the harmonics of whale calls into blocks and uses energy to modulate information. It is easy to be affected by the interference of the underwater acoustic channel, but the present invention adopts the mode of frequency spectrum during modulation, which has strong anti-interference

Chinese patent specification CN107395292A discloses an information hiding technology communication method based on marine biological signal analysis, which uses echo delay and amplitude parameter modulation information, but this method does not process the time-frequency characteristics of the used dolphin whistle signal, Susceptible to interference from multichannel channels and other marine life calls

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