Underwater acoustic communication method for simulating dolphin whistle signal via segmented LFM signals

Abstract

The invention discloses an underwater acoustic communication method for simulating a dolphin whistle signal via segmented LFM signals. According to the property that the frequency of the dolphin whistle signal changes with time, a plurality of LFM signals are segmented and combined to simulate the dolphin whistle signal, and a BOK method is used for achieving information modulation on the LFM signals to achieve bionic underwater acoustic communication modulation based on the dolphin whistle signal and the LFM signals. The central frequency and modulation frequency of each segment of LFM signals in balanced receiving data are estimated at a receiving end and are demodulated according to a dolphin whistle signal sample adopted during modulation to obtain demodulation information. The underwater acoustic communication method for simulating dolphin whistle signal via segmented LFM signals can be used for achieving bionic simulate underwater acoustic communication with high reality through a single linear frequency modulated signal and enhancing the communication imperceptibility and practicability.

Description

technical field [0001] The invention belongs to the field of underwater acoustic communication, in particular to an underwater acoustic communication method using segmented LFM signals to imitate dolphin whistle signals. Background technique [0002] In recent years, with the development of modern detection technology, concealment requirements have been put forward for underwater acoustic communication. [0003] The traditional covert communication method is to hide the communication signal in the background noise, that is, the covert communication under the condition of low signal-to-noise ratio. However, due to the time extension, frequency extension and severe attenuation characteristics of underwater acoustic channels, signals at the same sound source level cannot achieve covert communication at different distances, especially when there is a monitoring device between the transmitting and receiving nodes. Different from covert underwater acoustic communication with low ...

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Problems solved by technology

Real dolphin call signal for communication, the communication effect depends on the sample quality used, the application is inconvenient

Chinese patent specification CN102355440A discloses an underwater acoustic communication method based on very small chirp keying modulation. This method uses ultra-narrowband signals modulated by very small chirp keying to realize high-speed information transmission, but does not emphasize the concealment performance of communication

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