DESCRIZIONE
Method for determining the position of a sender (310) emitting an AIS (Automatic Identification System) message.
The method is characterised in that at least three receivers (320,330,340), respective clocks (507) of which have been previously synchronized, receive one and the same radio signal (520) from the sender (310), in that each of the receivers determine the time of receipt of the same predetermined signal element of the received signal, in that a location of the sender is determined by triangulation, based upon the respective location of the three receivers in combination with differences in the respective point in time for the respective receipt of the said signal element, and in that the respective time of receipt of said time of receipt is determined, by each respective one of said receivers (320,330,340), by determining a stream of data bits from a digitally stored sampled signal representing the said radio signal, by correlating said sampled signal to a digital comparison signal constructed to simulate the said sampled signal and on the basis of said stream of data bits. [Image Omitted]