A Study of Ship Trajectory Restoration Based on Vondrak Filtering and Cubic Spline Interpolation

Ship trajectories record the ship locations and times,which are significant for analyzing the navigation states and projecting maritime accidents.In order to correct the data errors of ship location and times due to AIS (auto-matic identification system)data transmission interruption and compensate the missing data of ship trajectories,this study proposed a ship trajectory restoration method.The study developed a distributive model of ship trajectories restora-tion by using Vondrak Filtering to smooth the navigation trajectories,and correcting the latitude and longitude informa-tion by using cubic spline interpolation,which formed the ship trajectories.The proposed restoration methods were veri-fied by Matlab under simulation.The results show that the algorithm error is 6.01×10 -5 and the proposed method can ac-curately restore ship trajectories.