| 其他摘要 | Satellite navigation system is an important spatial information infrastructure, which provides continuous, timely and accurate position, speed and time signals to users all over the world. The operation and maintenance of the system is one of the core tasks after the system is built. With the development of science and technology, satellite navigation system has realized autonomous navigation through inter-satellite links. But even such a highly automated system cannot be separated from the interaction between human behavior and the system, which often affects the performance of the whole system in decision-making, fault diagnosis and emergency disposal. In the daily operation of the system, human participation is mainly embodied in the operation of monitoring, alarm recognition and disposal, fault diagnosis, etc. Whether the performance of human in the interaction with the system meets expectations is one of the key factors affecting the performance of the system. This influence is especially reflected in the task of dealing with unexpected failures. The unexpected failures of satellite navigation system often affect the availability, stability and service index of the system. Rapid response and successful disposal of unexpected failures are important indicators of the performance of the system. How to improve the response and disposal efficiency of unexpected failures is of great significance for the continuous and stable operation of satellite navigation system to reduce the impact of failures on system service indicators.For the first time, this paper uses real events to study how human factors affect the performance of the system in the process of operation and maintenance of satellite navigation system, in order to provide reference for the management, setup and optimization of operation and maintenance of satellite navigation system, to reduce the impact of failure on the system service index and improve the system, and to ensure the continuous and stable operation of the satellite navigation system. The actual data of this study come from the log files of Navigation Service Control Center of Beidou satellite navigation system. The log files contain all kinds of information about the fault handling process of system breakdowns. The time of system failure is random. The operator records the information of key nodes in or after the process of fault handling. In this study, 635 log files of fault handling were collected, 180 of which were navigation fault handling records. Relevant fault information was extracted, including fault property and technical description, fault occurrence time, recovery time and demographic statistics of operators. By sorting out these information, we extract the independent variables that affect task performance, such as task complexity, time of day, shift handover and team skill composition, and select the completion time of sub-tasks in three stages of navigation service failure judgement, on-board diagnosis and recovery, and navigation service reinitiation. The performance of fault handling is analyzed by multiple regression analysis.The results have several significant findings. Firstly, task complexity is the most significant predictor of sub-task completion time in the three stages of fault handling, p < .001. Secondly, when the fault occurs during the shift handover period, the completion time of navigation service reinitiation takes longer, p < .001. Thirdly, when the fault occurs between 0:00 and 4:00, on-board diagnosis and recovery time increases significantly, p < .05. Finally, team members with the most relevant professional background have a significant impact on the completion time of navigation service failure judgment and navigation service reinitiation phase, p < .01, p < .001.The results of this study require managers not only to use professional technology in the field of satellite navigation to improve the system, but also pay attention to the impact of human factors on maintaining the efficient operation of the system. Based on the research results, this paper considers and investigates the specific application of operation and maintenance of satellite navigation system, and puts forward suggestions for managers and designers from the aspects of centralized monitoring means, simplification of routine steps, fault handling responsibility, and isomerization of skill level of operator team, with a view to improving the overall performance of system maintenance, and to guarantee the continuous and stable operation of satellite navigation system. |
修改评论