Research And Implementation Of Ocean Remote Sensing Data Transferring System

For supporting efficiently data transmission of ocean remote sensing during navigation process and making it possible to use P2P system for efficiently data transmission in unstable network environment, the research of this paper is focused on data transmission management and system fault tolerance management in ocean remote sensing system. A lot of works have been done to realize the reliable data transmission of ocean remote sensing data between the ships in ocean environment.The main work of this thesis is as fellows:The unified data management and fast transmission technology for the ocean remote sensing data. Firstly, the unified data management of isomeric ocean remote sensing data is realized by utilizing multistage geospatial grid data, which can avoid the influence of the isomeric feature in ocean remote sensing data. Second the operation strategy based on TCP/IP protocol is developed to improve the bandwidth usage, making it possible to efficient transform the remote sensing data in delay network. At last, the global parallel data transmission management scheme for ocean remote sensing data is proposed to improve the utilization rate of the system's network resource. The parallel transmission for multi-node remote sensing data is accomplished by the center node based management for data distribution.Research on generic fault-tolerance method applying to ocean remote sensing image transfer system under non-stable communication environment. Due to stable infrastructures are not available in ocean environment, disruption among communication nodes of P2P based systems has become a major challenge that affect stability of the whole system. To this end, this study proposes a novel fault-tolerance method by selecting the central nodes according to the their trust degree and contribution. Through building an inter-complementation mechanism among data nodes, a robust break-point retransmission method is implemented. The central nodes selecting policy and inter-complementation based retransmission method have greatly improved anti-disaster capacity of the whole system.The prototype system was implemented and tested in real environment, and the experiment results shows that the system can uniformly transfer heterogeneous remote sensing image among ocean-board ships and can be rather scalable, efficient and stable with refined fault-tolerance mechanism.