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This paper has a detailed introduce on parts of differential GPS system and construction method in control point positioning experiment .This paper also solves some problems, such as excluded from multipath interference. This paper focuses on analyzing the result accuracy of RTK positioning method. This experiment can eventually achieve the positioning accuracy is 2 centimeters or so.

Abstract. With the increasing of piracy attacking actions in international waters and risk factors of navigation, safe and fast operation of the ship, even the safety of life and property at sea, it is particularly important to focus on vessel safety, human life, emergency status of the crew's comprehensive quality. A state of emergency crew quality evaluation index system is established in this paper, divided into a level indicators and secondary indicators, through a questionnaire survey of experts to get the weight of each index. We use analytic hierarchy process to establish mathematical model, combining qualitative and quantitative, and draw a conclusion: In case of emergency, the crew psychological quality, practical skills, physical fitness, theoretical knowledge and English level are the most important factors to overcome the difficulties and dangers.

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