Research And Design Of An Acoustic Release’s Communication Module

The formation of the oceans is an indispensable condition for the origins of Earth. The oceans are rich in biological resources, mineral resources and hydro resources. With the development of technology and consume of land resources. Human tern their eyes to the oceans which are rich in resources, also marine high-tech development achieved considerable leap. Acoustic release plays an important role in marine science, engineering and military fields for maritime search and rescue and salvage important equipment. Acoustic release communication module is to achieve communication between two extensions. Research on excellent acoustic communication module has great significance for acoustic release in achieving its reliability and security.In chapter one, the research background and the significance of acoustic release is introduced as well as its communication module. Then, based on the research literatures and patents abroad, the current situation and the development of acoustic release is described. Finally describes the main contents of this paper.In chapter two, the working principle and basic workflow of acoustic release is introduced. Then the work state and failure modes of acoustic release are discussed. Clarify the importance of acoustic release communication module. Then the basic principles and characteristics of the underwater acoustic communication is introduced. And introduced the underwater acoustic communication digital modulation techniques, includes describes the principles and characteristics of several commonly used digital modulation techniques, and analyze their applicability in underwater acoustic communication, choose a suitable modulation method for the acoustic release communication module. Finally, we discussed the spread-spectrum communication technology, including basic concepts, characteristics, classification and spreading sequence and determined the design direction of the acoustic release communication module.The third chapter introduces the concepts and mathematical definition of zero correlation zone sequences, and describes a construction method based on complementary sequence of sequence sets of zero correlation zone. Using this construction method, constructed a zero correlation zone sequence set with a length of64and analysis its correlation characteristics. Verified the zero correlation zone sequence is suitable as a sequence of direct spread spectrum communication system.In chapter four, according to the characteristics of underwater acoustic channel, based on QPSK modulation and direct sequence spread spectrum technology and zero correlation zone sequence, the sending module and the receiving module of acoustic release communication module is theoretical analyzed and built. Then the designed communication module model is programmed and simulated in matlab, and associate it with other underwater acoustic communication schemes for simulation comparison. Validate the model has lower complexity, and have high reliability and strong securityIn chapter five, an experiment is built for testing the transceiver effect of the acoustic release communication module in pool underwater acoustic channel. Described the preparation and parameter setting of the experiment, and the carrier modulation, symbol synchronization, channel estimation and signal to noise ratio calculation were also described and analyzed. Finally, via the analysis of the results, verified the designed communication module in the air channel, has a lower error rate and high reliability and safety, exhibit excellent performance.