Simulated dolphin whistle continuous phase multivariate frequency modulation underwater acoustic communication method

Abstract

The invention belongs to the technical field of underwater acoustic communication, and particularly relates to a simulated dolphin whistle continuous phase multivariate frequency modulation underwateracoustic communication method. The method of the invention includes the following steps: performing continuous phase multivariate frequency modulation on information by a sending end; adding the modulated signal with a time-frequency spectrum profile of an extracted dolphin whistle signal in a certain proportion to generate a synthesized whistle, and further obtaining a simulated whistle data signal; adding an original whistle signal before the simulated whistle data signal to serve as a synchronization signal, and forming a frame of transmission signal; after a receiving end performs synchronization, extracting each symbol waveform; and calculating correlation functions between each symbol waveform and all possible signal waveforms of the symbol, and judging a maximum correlation peak toimplement demodulation. According to the simulated dolphin whistle continuous phase multivariate frequency modulation underwater acoustic communication method, provided by the invention, each symbolcan modulate a plurality of pieces of bit information, the communication rate is high, the similarity between the synthesized whistle signal and a real whistle signal is high, and the underwater acoustic communication method has strong concealment and can meet the requirements of underwater covert 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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