Abstract: This system, used to acquire and process in real time data pertaining to the position and/or physical performances of one or several persons in motion on a field, in particular athletes in motion on a game field, includes:a) devices used for a real time acquisition of the individual instantaneous positions of every person on the field;b) digital processing devices associated with said acquisition devices in order to determine a set of digital Values which are representative of the physical performance of said persons based on said instantaneous position information;c) interface devices connected to said digital processing devices responsible for preparing digital Values which are representative of the physical performances as well as for their graphic representation.The purpose of the invention is the tracking of athletes and of a ball on a game field.