Hybrid chaotic LPI (Low Probability of Interception) communication system design method

Abstract

The invention discloses a hybrid chaotic LPI (Low Probability of Interception) communication system design method. According to the method, firstly, sequence chaotic system design of a digital communication system is implemented, a digital chaotic sequence is generated, simultaneously, according to characteristics of a channel, generation of carrier continuous chaotic signals is implemented, and by cascading of the digital chaotic sequence and continual chaotic signals, design of a hybrid chaotic system is implemented; and a receiving end firstly implements detection of the continuous chaotic signals, generates a digital sequence and then implements demodulation of a discrete chaotic sequence. Digital chaotic time domain waveforms and frequency domains of the continuous chaotic signals have flatness and are similar with a spectrum of noise, and thus, the continuous chaotic signals have the very high hiding characteristic; and power spectra of the continuous chaotic signals are very similar with that of the environmental noise and meanwhile, are very low in probability of interception, and thus, implementation of cascading of the continuous chaotic signals and the digital chaotic sequence greatly improves hiding performance to a certain degree.

Description

technical field [0001] The invention relates to the design of communication waveforms with low interception probability, in particular to a design method of mixed chaos low interception communication system. Background technique [0002] Underwater low-interception communication sonar focuses on the confidentiality of information and the restoration ability of the receiving end. Although low-interception sonar communication systems have developed rapidly in recent years, most of them are signals with characteristic forms. Due to the characteristics of underwater acoustic channels, signals at the same sound source level cannot achieve low-interception communication at different distances. Based on this, a method of using chaotic signals as an information carrier is proposed. This communication method allows the communication signal to be detected, but it will be detected as marine biological noise during identification to achieve the purpose of low-interception communication...

AI Technical Summary

Problems solved by technology

Due to the characteristics of underwater acoustic channels, signals at the same sound source level cannot achieve low-interception communication at different distances

Based on this, a method of using chaotic signals as an information carrier is proposed. This communication method allows the communication signal to be detected, but it will be detected as marine biological noise during identification to achieve the purpose of low-interception communication. However, this method carries information. Fewer, not conducive to real-time communication

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