Design And Implementation Of Reliability Improvement Of Controlled Waterway Vessel Traffic Command System

Ships passing through the upper reaches of the Yangtze River must be orderly and unidirectional according to the command signal of the signal station.Controlled waterway vessel traffic command system acquires ship dynamic information in real time and generates command and dispatch decisions for ships according to unidirectional waterway traffic command rules,which can effectively assist signalman to command vessels passing through.Due to the complex geographical environment in controlled waterway,the low reception coverage of AIS(Automatic Identification System)signal and the low accuracy of command signal and other factors seriously affect the reliability and accuracy of the traffic command of the vessel traffic command system,and it is difficult to guarantee the traffic safety and efficiency of some controlled waterway further.How to further enhance the command reliability of the vessel traffic command system according to the actual situation of the controlled waterway,ensure the safety of the vessel traffic and improve the traffic efficiency is of great significance.The stability and command accuracy of Controlled waterway vessel traffic command system ensure that the system provides reliable command decisions.This thesis takes Wangjiatan controlled waterway in Chongqing as the research background,aiming at the problems in the long-term operation of the vessel traffic command system in the Wangjiatan controlled waterway,starting from the actual needs of waterway production,to improve the reliability of the command system,studied the system stability and command accuracy based on the existing technical platform,to achieve the goals of improving the comprehensive service level of command system and the efficiency of vessel traffic.The main contents of this thesis include:(1)Analyzed the stability and command accuracy of Wangjiatan controlled waterway command system are analyzed in detail.Analyzed the key techniques involved in the research work,and made the relevant technical route of system reliability improvement.(2)Aiming at the problems of insufficient service capability of ENC map of the command system,constructed an electronic waterway map based on ArcGIS,upgraded the visualization function of the system,and improved the stability and operability of the system.(3)Aiming at the low coverage of AIS receiving and the single point failure of collaborative command system in Wangjiatan controlled waterway,selected the suitable AIS device for multi-point deployment.Aiming at the data redundancy and conflict caused by multiple AIS sources,designed the AIS deduplication and fusion algorithm based on GPS time and the cache-based deduplication and fusion algorithm.Through field comparative test,the cache-based deduplication and fusion algorithm is used as the deduplication and fusion method of multi-AIS receive data after system upgraded.(4)Aiming at the situation that too many upstream waiting vessels,long waiting time and poor effects of assistant command in Wangjiatan controlled waterway,a prediction model of arrival time of vessels is established by means of secondary moving average method and center line trajectory approximation method,and the time required for vessels pass through the controlled waterway is predicted based on time series and historical average model,and the future behavior of vessels is accurately grasped,to assist signalmen in commanding vessels pass through accurately and efficiently.Finally,updated the vessel traffic command system based on the research in this thesis,and deployed in Wangjiatan controlled waterway signal stations.The field test results show that the research work of this thesis can effectively improve the command reliability of vessel traffic command system.The research results of this thesis can be further extended to other controlled waterway in the upper reaches of the Yangtze River.