Whale-like Whistle Communication Method Based on Segmented Time-Frequency Profile Delay Modulation

Abstract

The invention discloses a whale-like whistle communication method based on segmental time-frequency profile time-delay modulation. The existing communication method simulates the real marine biological call signal through mathematical modeling, which lacks universality and has a wide signal frequency band, which is not conducive to practical application. This method starts from the original whistle signal of cetaceans, firstly segments the time-frequency profile of the whistle signal according to the requirement of the code element length, and then uses different time delays on each segment to characterize the information to be transmitted, Finally, the corresponding bionic modulated signal is synthesized by using the modulated time-frequency profile. When demodulating at the receiving end, the demodulation of the communication data can be completed according to the time delay on each symbol segment. This method directly uses the original whistle signal as a communication signal, does not need mathematical modeling of the whistle signal, and has good universality and bionic concealment. The cetacean whistle signal has good time-frequency characteristics and correlation, and can also replace the traditional synchronization signal to enhance the concealment of underwater acoustic communication.

Description

technical field [0001] The invention belongs to the technical field of communication, in particular to the technical field of underwater acoustic covert communication, and relates to a communication method for imitating cetacean whistle based on segmental time-frequency contour delay modulation. Background technique [0002] Traditional terrestrial communications generally use electromagnetic waves as information carriers, but electromagnetic waves are attenuated in an underwater environment and cannot perform long-distance communication, so they are not suitable as information carriers for underwater communications. In underwater communication and positioning, sound is often used as the carrier of information. However, due to the openness and unreliability of the underwater acoustic communication channel, the underwater acoustic communication is easily intercepted by eavesdroppers, and even subjected to various attacks. Therefore, how to ensure the concealment and security...

AI Technical Summary

Problems solved by technology

The invention patents with the application numbers 201611079780.9 and 201610865813.6 respectively disclose a bionic communication method using FM modulation of dolphin communication signals and a modeling method of imitating dolphin active pulse signals, both of which simulate the real whistle signal through mathematical modeling The limitation of time-frequency profile is that the mathematical model can only simulate some specific whistle signals, which is not universal. At the same time, the error in the modeling process will also reduce the bionic performance of the signal, and the concealment is poor.

The application number is 201510676933.7. The Chinese patent discloses an underwater acoustic communication method based on ultra-wideband signals imitating dolphin ticking sound. will be limited in practical use

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