Acoustic-optical-based cross-medium covert communication system and method

Abstract

The invention relates to an acoustic-optical-based cross-medium covert communication system and method. The communication method comprises the steps that a controller encodes a communication signal; The transducer array transmits sound waves carrying the communication signals to a water-gas surface so as to excite the water-gas surface to generate ripple changes; The optical emitter emits a beam of light wave to the optical lens, and the optical lens expands the light wave and irradiates the light wave to the water vapor surface excitation area; The optical acoustic lens array receives emittedlight waves emitted by the water vapor surface excitation area; The processor analyzes the statistical characteristics of the emitted light waves to obtain communication information. The communication method is divided into two parts according to the characteristics of different media of sound waves and light waves, the water vapor surface is excited in water through sound wave communication, water surface communication information is collected through the light waves in the air, node communication equipment such as buoys or wireless transmission is not needed on the water surface, the cost is saved, and the concealment, safety and randomness of communication are improved.

Description

technical field [0001] The present invention relates to the technical field of communication, and in particular, the present invention relates to an acousto-optic-based cross-medium covert communication system and method. Background technique [0002] The propagation of sound waves in water has the advantages of low loss and long propagation distance. It is the energy form with the best propagation performance in water so far, and it is also the main means of underwater target detection and communication. However, since the propagation of sound waves in seawater is greatly affected by factors such as temperature, salinity, and depth, and the sound waves have a large reflection loss when passing through the air-water interface, this makes acoustic underwater communication have greater uncertainty. sex. Moreover, due to the limitation of the air-water interface, to realize the communication between the underwater target and the air platform, it is necessary to probe the detec...

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Problems solved by technology

[0005] Chinese invention patent CN107231181A discloses a sea-air collaborative monitoring system for cross-media communication and its use method. The monitoring system includes an underwater monitoring device, a water surface monitoring device and a buoy relay device. The underwater monitoring device is autonomous The submersible is used for underwater monitoring, the water surface detection device is used for water surface monitoring, the buoy relay device is respectively connected to the underwater monitoring device and the water surface monitoring device, and the underwater monitoring device Work cooperatively with the water surface monitoring device through monitoring information exchange. In this invention, it is necessary to arrange a water surface monitoring device and a buoy relay device on the water surface, which is easy to expose the position and has poor concealment

[0006] Chinese invention patent CN104618032A discloses an electromagnetic wave transmission system and method across the seawater-air interface. The system includes one or more underwater acoustic-electromagnetic wave submersibles and a monitoring platform. The underwater acoustic signal received by the underwater device is converted into an electromagnetic signal, which is transmitted to the monitoring platform through the side wave propagation path of the electromagnetic wave in the cut-off with a small conductivity to be received. In this invention, the electromagnetic wave is used to achieve cross-media transmission. Therefore, the electromagnetic wave attenuates quickly in water and the transmission performance is poor. Therefore, the distance of signal transmission that can be achieved by using this system is limited.

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