| The seafloor observation technology is applied to seafloor research, marine mineral resources exploration and related to the marine research field. The geomagnetic observation technology is an important part of the seafloor observation. Recently, observation of seafloor geomagnetic has attracted more and more attention in application, especially in the fields of the deep-sea resources investigation, the earthquake monitoring, military anti-seafloor and so on. The net of seafloor geomagnetic observation is a huge plan, which is based on covering widely range of seabed through the information transmission network. This foundation will change a blank state in this high-end area of our country, and it also has initiative significance of marine science, environmental science, public safety and national security fields. The solution of several core technologies to the net of seafloor geomagnetic observation will make the implementation plan with feasibility in the future. This thesis focus on investigation and design seafloor geomagnetic collection system based on the CAN-bus, which is reduce the number of connecting wires, load of the system itself, improve the versatility and flexibility of the system and get the valid data to provide for the fields of earthquake monitoring, military anti-seafloor and so on.This paper is mainly divided into following subsections:1. The seafloor observation technology is introduced first, and the state-of-art and tendency of the seafloor observation technology in domestic country and abroad are concluded and summarized. And the foundation of the seafloor observation network is described.2. The paper analyses the whole structure of the system and the research task of the each subsystem as well, including the mission requirement of collection node and control node in the seafloor observation system and the theoretical research on the covering problem of the wireless sensor network. Also the core technologies used in the system is introduced generally.3. This paper analyses the CAN-bus technology, mainly introducing the feature and technical specifications of the CAN-bus, including the electrical characteristics, layered structure, message transmission, error detection, conflict arbitration and so on, also the reason why the system choose CAN-bus is elaborated.4. This paper decscribes the design of the seafloor collection system in detail. The structure diagram of the collection node based on STC89C52controlled is analyzed firstly in the thesis. The designing of the hardware is introduced, including acquisition circuit, processor peripheral circuit, communication circuit and also the software design including the communication initialization, data transmission and reception. Then the PCB hardware design and embedded software design of the control node based on STM32F103VBT6controlled is described, including power supply circuit, processor peripheral circuit, communication circuit. And then it makes a detailed describe of software code design.5. The Wireless Sensor Network composed of buoy installment that is connected with the seafloor collection system, which is the research content of the thesis. From the angle of coverage and energy point of view, this paper gives the algorithm to solve the covering problem of the wireless sensor networks, including analyzing the nodes disposition and reducing the redundant nodes to improve the coverage rate. Simulation results prove that the algorithms are effective.6. Finally, this paper carries out the experiments of the seafloor collection system, with detailed collection, organization, analysis of the seafloor data from each node through the design and display of the PC debugging interface. Experiments verify the system is basically meeting the subject of the indicators required and the design target. At last the paper makes a summary of the whole working and points out the place that can be further improved and then looks ahead the application prospect of seafloor geomagnetic observation technology. |
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