A METHOD FOR OBSERVING AND RECORDING THE IDENTITY, POSITION AND MOVEMENT OF ONE OR MORE VESSELS IN SPECIFIC WATERS OR SAILING LANE

A method to automatically and continuously provide surveillance based on central and/or distributed surveillance of presence, positions, movements and movement pattern of one or more vessels in narrow waters, a sailing lane or where danger of collision with other vessels or other fixed or floating objects may occur. A vessel emits a sweeping signal that repeatedly hits one or more detectors, which detect the character of the sweeping signal and the time intervals between the signal hits on the respective detector. The exact position of the vessel and/or movements is calculated at least on the basis of trigonometric principles, and the vessel identity is produced by using signal analysis to extract the characteristic signal sequences from the received detection signals, which are related to the transmitted radar signal(s) from the vessel(s).