Laser frequency hopping underwater acoustic-induced digital communication system and laser frequency hopping underwater acoustic-induced digital communication method

Abstract

The invention discloses a laser frequency hopping underwater acoustic-induced digital communication system and a laser frequency hopping underwater acoustic-induced digital communication method. The reliability and security of both parties of communication in information transmission are guaranteed according to the channel characteristics of a communication environment. According to the invention, atmospheric optical communication and underwater acoustic communication are combined, the laser frequency hopping technology is adopted, a laser emits laser light under the control of a code formed by loading information to different repeated-frequency frames, and laser energy is transmitted by atmosphere to the surface of water and then interacts with water medium through evaporation or breakdown. Thus, optical wave energy is converted into acoustic wave energy which is transmitted underwater in different directions and can be received by an underwater acoustic collector placed in any position within a certain range underwater, and thus, non-line-of-sight data communication from air to underwater can be completed. As long as both parties of communication abide by an agreed laser frequency hopping communication protocol, the information security and privacy of both parties of communication can be guaranteed to a certain extent. Thus, the communication method applicable to an open channel environment has more practical values.

Description

technical field [0001] The invention relates to the fields of optical communication and underwater acoustics, in particular to a laser frequency hopping underwater acoustic digital communication system and method. Background technique [0002] With the increasing frequency of people's ocean activities, underwater acoustic communication is no longer limited to the military field, but has been widely extended to civilian fields, such as seabed topography mapping, underwater target control, etc. The expansion of marine applications of communication has made the underwater communication The demand has increased greatly, and at the same time, there are higher and higher requirements for communication technology. In the vast sea area, the propagation attenuation of light waves and electromagnetic waves is very large, and the transmission distance is very limited, which is far from meeting the communication needs of the increasingly active ocean activities of human beings. At the ...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is the poor safety of traditional marine communication and the high requirements for communication links. It provides a laser frequency hopping underwater acoustic digital communication system and method

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