SYSTEM FOR PROTECTING PEOPLE ON A WORKSITE THROUGH PRECISE POSITIONING

摘要

The invention relates to a system (1) for protecting people individually or collectively in a potentially dangerous area, which includes a plurality of reference markers (3) and a central marker (4) which are distributed in said area, said reference markers (3) being in two-way communication with one another and with the central marker (4), and which are capable of measuring the distance therebetween with an accuracy which is at least equal to a predetermined value, the central marker (4) being capable of determining a two-dimensional or XY frame of reference, i.e. of assigning a position to three reference markers (10, 20, 30) and then of locating the other reference markers (40, ...) in said XY frame of reference by a trilateration method; at least one movable transceiver, referred to as a tag or indicator (6), worn by a person (1) and capable of two-way communication with at least the central marker (4) and with other tags (6), and of measuring, by trilateration, the distance separating the transceiver from each of the reference markers (3), said tag (6) being provided with danger-warning means which can be actuated by the central marker (4); and means (5) for tracking a border (2) of the potentially dangerous area from the position of the reference markers (3) once the latter have been located in the aforementioned XY frame of reference, said border (2) being suitable for defining at least one area in which the presence of a person (1) causes the central marker (4) to actuate the danger-warning means associated with the tag (6).