Design Of Underwater Acoustic Communication Network Node

"Underwater acoustic communication network node" is 863 projects in the field of marine technology deployed in the "Eleventh Five-Year" period, the state attaches great importance to development of marine resources. Consolidation of a number of the problems and the design requirements of underwater acoustic communication network node, for the issue of radio wave under water have attenuations and nodes have large volume, this paper research the underwater acoustic communication network node’s hardware platform to meet the testing requirements of under acoustic communication network.Underwater acoustic communication network node hardware platform is mainly composed of acoustic emission module and receiver module. The main contents of this article: in the acoustic emission module, acoustic emission signal source is generated by the microcontroller make the m-sequence and via the DDS chip modulated into an analog signal. Using a bridge amplifier circuit designed the acoustic power amplifier, and do the amplifier circuit simulation of acoustic power amplifier; in the acoustic receiver module, use the low-noise op-amp chip designed acoustic low-noise amplifier filter circuit, designed a acquisition、transmission and storage unit, and do the simulation of differential amplifier function of the underwater acoustic receiver module.In the case of the simulation is correct, to build the experimental platform of underwater acoustic communication network, and do the experiments testing in the laboratory and outdoor. Test results show that: when tested in a laboratory tank, water differential amplifier circuit sound module received the signal magnified about 100 times; when test outdoor, at a depth of 1m shallow waters, transmission system work normaly, ranging error does not more than 0.5m, basically meet the underwater acoustic communications network testing needs.