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

A technology of frequency modulation signal and underwater acoustic communication, which is applied in ultrasonic/acoustic/infrasonic transmission systems, electrical components, transmission systems, etc. It can solve the time-frequency characteristic processing of dolphin whistle signals, the influence of underwater acoustic channel interference, and the time-spectrum profile Changes and other issues, to achieve high reliability, reduce impact, improve the effect of similarity
CN109347568BActive Publication Date: 2021-04-20HARBIN ENG UNIV
8 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
HARBIN ENG UNIV
Publication Date
2021-04-20

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

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.
Need to check novelty before this filing date? Find Prior Art

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...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More