Ship wandering detection method based on AIS data
A detection method and technology for ships, applied in the field of big data analysis, can solve problems such as time-consuming, labor-intensive, and poor detection targeting, and achieve the effect of promoting safety, ensuring safe navigation, and enhancing safety
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[0024] The present invention will be further described below in conjunction with accompanying drawing:
[0025] The present invention assumes that in the research area, the numbers of rows and columns of the spatial grid are respectively p and q, and before identifying the abnormal wandering behavior of the ship, it is necessary to define the relevant variables:
[0026] (1) Grid count variable n(u, v), the number of track points contained in the grid. u is the row number of the grid, and v is the column number of the grid. The default value of n(u, v) is 0. When the track point falls into the grid, the grid count variable changes accordingly. The grid count variable indicates the repeatability of the trajectory in the grid. If the trajectories of the same ship within a certain time range intersect or the trajectories are dense, multiple trajectory points will be queried in the grid.
[0027] (2) The number of effective grids n (effective), if the count variable of the grid ...
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