The Research And Application Of Technology On Underwater Wireless Redundant Communication

These years, the oceanic science and technology has been attached more importance. Human beings are exploring into deep oceans with a series of operation devices, for example, sampler, in-situ sensor and so on, which are often placed at the bottom of the ocean by such underwater robotics as ROV and AUV. So, there is a need for the operation devices and underwater robotics to communicate with each other.The ocean is a very special working environment. Considering the factor of safety and convenience, those traditional communication modes are not able to reach given requirements any longer. Further more, the working environment undersea is so terrible that the devices which work well on land are quite likely to be of some problems. Therefore, providing a set of redundant equipment is a necessary means which could enhance the reliability of the devices. Taking into account those points above, the study of underwater wireless redundant communication technology has become one of the issues which has a great relationship with the ocean exploration.This article gives a description of a kind of wireless communication method-optical communication which transforms optical signals into voltage signals to achieve data communication. The main task of this part consists of the choice of the wave length and the photoconducting devices, and the design of the circuit. Besides, in order to make the devices able to work undersea, a sealed pressure casing is designed to make sure that sea water will not permeate inside. This kind of communication method has many merits: simple desigh, low price, being compact and so on.ICL is another means for wireless underwater communication. The Institute of Mechatronic Control Engineering of Zhejiang University has successfully developed the ICL technique for underwater wireless communication and put it into practical use. This article combines ICL and the LED-based communication mode to achieve the two-way underwater wireless redundant communication. Besides, this integration and GPS technique are used together in the navigation system of submarine.It is proved by examination that the LED-based communication devices can work well in and out of water, as well as successfully transferring data. Besides, this article realizes the simulated experiments of each link of submarine navigation system.The optical communication system and the submarine navigation system are successfully designed and tested in this article, yet no matter in technical specification or in application environment, they can be improved greatly to promote the development of our oceanic science and technology.