Research On Route Trajectory Restoration And Extraction Technology For Fishing Vessel Monitoring Platform

As a major marine country,China ’s marine fishery production has always been in a pivotal position,and it is the object of great concern of the national government departments.How to scientifically manage marine fishery production is not only a livelihood issue related to the interests of fishermen,but also related to the development process of our country.With the rapid development of computer technology and the vigorous promotion,a series of effective means for scientific management of marine fishery production have been introduced.The fishing vessel monitoring system,which combines intelligent sensors,satellite positioning technology and geographic information system technology,is one of them.At present,a large number of fishing boats have been incorporated into the fishing boat monitoring system,which can obtain fishing boat trajectory data regularly.Relying on the trajectory data provided by the fishing vessel monitoring system to build a platform related to fishery production management is of great significance for fishery-related government departments to follow up on marine fishery production trends,establish safety guarantees for fishing boats’ offshore operations,and improve fishery production order and norms.This thesis uses the trajectory data provided by the fishing boat monitoring system to design and implement the Zhoushan fishery safety and precision intelligent control platform for the fishery production management in Zhoushan City.In the process of fishery production management,due to various factors such as hardware equipment problems and signal transmission errors,the lack of trajectory data is unavoidable,which has a certain impact on the utilization of historical trajectory information.In addition,due to the imperfect management system,the phenomenon of fishing boats occupying the channel of merchant ships often occurs,resulting in the collision of commercial and fishing vessels and the congestion of the channel of merchant ships.In view of the above problems,combined with the requirements of the trajectory playback function module and the channel monitoring function module of the Zhoushan fishery safety precision intelligent control platform,this thesis takes the trajectory data as the research object,and proposes a fishing boat trajectory restoration method based on multi-step interpolation and a trajectory extraction-based method.Channel congestion analysis method.The main research contents of this thesis are as follows:(1)Aiming at the problems that the current trajectory repair method based on interpolation algorithm cannot interpolate the speed and heading data,and the accuracy of the repaired ship position information is low,this thesis proposes a fishing boat trajectory repair algorithm based on multi-step interpolation.The algorithm first uses the cubic spline interpolation method to complete the speed and heading information of the missing trajectory segments.According to the completed speed,heading information,and the trajectory data before and after the missing trajectory segment,the ship position information is repaired using a bidirectional iterative method.Comparative experiments show that the algorithm can effectively improve the accuracy of trajectory repair.(2)Aiming at the shortcomings of generality and accuracy in the extraction of characteristic trajectory points and the extraction of typical trajectory in the typical trajectory extraction model,a channel congestion analysis method based on dense trajectory extraction is proposed.Among them,in order to solve the problems of poor generality and low similarity with the original trajectory when selecting the characteristic trajectory points,the minimum description length criterion algorithm is adopted to extract the characteristic trajectory points.The experiments show that the algorithm has higher generality and accuracy.Aiming at the problem that the trajectory cannot be extracted based on the density,the trajectory extraction algorithm based on the scan line model is adopted to extract the trajectory with higher density.The experiment verifies that the model can extract the congested route more effectively.(3)This thesis designs and implements the Zhoushan fishery safety and precision intelligent control platform,which is an integrated platform for Zhoushan fishery production management.In view of the loss of fishing boat trajectory data,which leads to the lack of information when displaying historical trajectories,the fishing boat trajectory restoration method proposed in this thesis is used to realize the trajectory playback function in the platform.The proposed channel congestion analysis method realizes the channel monitoring function in the platform.