Map projection positioning method in ranging-mode of automatic identification system

This paper investigates a positioning method based on the map projection in the ranging-mode (R-mode) of Automatic Identification System (AIS). The geographic location of the vessel is calculated into a at two-dimensional plane using the direct and inverse transformations based on the map projection. Furthermore, the degree zone conversion algorithm is also proposed when the vessel and the AIS shore stations are not in the same degree zone. Finally, the positioning method is verified by the simulation results using information provided by the real AIS shore stations.