The Design Of Data Synchronization Technology In Underwater Distributed Sensor System

Technology society has witnessed the improvement and development of network technology,the mesuarement the accuracy and extending the region coverage promotes the development trend of sensor technology networked.In the field of radio,distributed detection system and sensor network technology have become the focus of information processing over the past decade.Similarly,in the underwater acoustic field the distributed systems are also in the process of gradual development.In the multi-sensor system,data synchronization is a key element influencing information integration.For this point,the clock synchronization among the underwater systems becomes even more important due to the characteristics of underwater sound propagation.In wireless sensor networks,clock synchronization protocols and standards has been formed.IEEE 1588(Precision clock synchronization protocol for networked measurement and control systems)with low deviation and high stability precision was generally accepted,without increasing network burden to improve the accuracy of time.This thesis aims to test the feasibility of wired sensors using in the data synchronization under the water and exploring the way to improve the accuracy of wireless sensor clock synchronization between different underwater nodes.This thesis includes three aspects content.Firstly,address to the issue on the data synchronization technology of different underwater sensor nodes,this thesis covers the synchronization principle of IEEE1588,and designs the synchronization models and algorithm;Secondly,a wired sensor system for data synchronization is developed under the protocol of IEEE1588 based on KSZ8463 of Michael Swiss company.And the system includes analog receiver module and main controlled module,which have the function of data acquisition,clock synchronization,and data transmission and so on.To test the performance of the system,experiments have been carried out in actual sensor systems.And the results indicate that the synchronization system can achieve high precision and stability of data synchronization;Finally,this thesis compares multiple data synchronization algorithm for the underwater wireless sensor network data synchronization requirements.The results of the simulation indicate the Doppler-Assisted Synchronization algorithm has some adaptability for the improvement of clock synchronization accuracy for underwater network.