A laser underwater acoustic digital communication system and method for hopping time slots

Abstract

The invention discloses a time slot hopping laser underwater acoustic digital communication system and a time slot hopping laser underwater acoustic digital communication method. The time slot hoppinglaser underwater acoustic digital communication system comprises a transmitting system, which comprises a data base band code input module, a variable time slot code processing module, a laser driving module, and a laser; a receiving system, which comprises an underwater sound acquisition device, an underwater sound signal amplification rectification module, and a variable time slot signal decoding processing module. The transmitting system and the receiving system are cooperated with each other to realize a digital communication function in an atmospheric channel and an underwater channel. The time slot hopping laser underwater acoustic digital communication method comprises steps that (1) information framing coding of to-be-transmitted information is carried out; (2) a variable-length data frame code having a guided code is output, and pulse lasers having different intervals are output, and a variable time slot laser output signal is acquired; (3) a laser energy signal is convertedinto an underwater acoustic wave signal; (4) the acoustic wave signal is converted into an electric signal, and after amplification and shaping, the signal is output to a digital demodulation module;(5) the digital demodulation module is used for signal decoding, and then is used for output display. The time slot hopping laser underwater acoustic digital communication system and the time slot hopping laser underwater acoustic digital communication method are advantageous in that the flexible transmitting and the flexible receiving of the signals and safe reliable communication are facilitated.

Description

technical field [0001] The invention relates to the fields of optical communication and underwater acoustic communication, in particular to a time-slot-hopping laser 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 the civilian field. The expansion of marine applications of communication has greatly increased the demand for underwater communication, and at the same time has more and more importance for communication technology. Come higher demands. 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 same time, the transmission optical path is complica...

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Problems solved by 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 same time, the transmission optical path is complicated and the receiving alignment technology is high; the ocean communication realized by using electromagnetic waves requires the underwater target to regularly float to the depth where the antenna is exposed to the water surface, which reduces the concealment of the communication target, which also limits this type of communication. The development of marine communication

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