On the Epuivalent Number of Vessles of Various Size in the Marine Traffic

Abstract

The observation in the separation of various size of vessels whose lengths are different considerably was carried out with a mm wave radar and a multiexposure camera, and the following results were obtained. The size of effective dowain is given as [numerical formula] where r_pq and S_pq are the length and width of the effective domain respectively and subscripts, P and q, refer to preceeding and following vessels, respectively. The ratio of the area of effective domain of a large sized vessel and that of the standard one is defined as "the equivalent number." Above equation gives that the equivalent number is proportional to the square of the length of vessel.