Underwater communication system for transmitting transducer

Abstract

Disclosed is an underwater communication system for a transmitting transducer. The underwater communication system includes a transmitting system and a receiving system. The transmitting system includes a transmitting PC (4), a power amplifier (5), the transmitting transducer (8), a scanner (1) and a microphone (3). The receiving system includes a PC (15), a test amplifier (9), a signal receiver (11), a printer (12) and a sound box (13). In aspect of data text communication, a Pattern time-delay-inequality coding communication system of the underwater communication system for the transmitting transducer is high in interference resistance capability and great in stability so that a Pattern time-delay-inequality coding differential decoding technology is adopted during decoding and thus the reliability is improved significantly. In aspect of voice and image communication, an OFDM communication system can ensure high-speed transmission of voices and images. Compared with underwater wired communication, the underwater communication system for the transmitting transducer is capable of realizing underwater long-distance wireless communication and better in economical efficiency and reliability.

Description

technical field [0001] The invention relates to the field of communication, in particular to a transmitting transducer underwater communication system capable of realizing real-time transmission of multimedia information such as data, text and voice. Background technique [0002] The 21st century is the century of the ocean. Human beings will develop and pay attention to the ocean to an unprecedented height, and various technologies around the ocean will emerge in endlessly. As the only means of underwater communication, underwater acoustic communication will surely become the focus of research in various countries. It will also develop rapidly. The present invention expects to realize underwater multimedia communication, and contribute to human exploration of the ocean, understanding of the ocean, and finally development of ocean resources. [0003] At present, underwater voice communication, image communication, etc. all need a higher frequency band utilization, but the t...

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Problems solved by technology

[0003] At present, underwater voice communication, image communication, etc. all require high frequency band utilization, but traditional FSK and PSK communication systems are obviously difficult to achieve

Foreign research is more representative: the DSP-based OFDM system designed by K.Miyoshi is combined with CDMA technology. In the simulation, the transmission rate of 450bps can be achieved at a distance of 5km, and the error rate of 0.00001 can be achieved by adding error correction codes; Frassati, In order to verify the performance of OFDM and DSSS in shallow seawater acoustic communication, F et al. conducted a sea test in the Mediterranean Sea (sea depth of about 80m-100m) in October 2004. The results showed that OFDM can still work well at a communication distance of 6km , while DSSS cannot communicate normally

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