Radar system for controlling accesses to an environment

A radar system for controlling accesses to an environment, comprising:

• one or more radar devices to be placed along an access path for accessing the environment, each radar device having a respective field of view,
• wherein the one or more radar devices are configured to define, in their respective fields of view, a plurality of passage regions arranged to be sequentially met while following said access path toward the environment,
• wherein the one or more radar devices include a first radar device configured to define at least two of said plurality of passage regions partially overlapping with each other or being disjoined to each other,
• wherein each radar device is configured to check the presence of targets in each passage region of its respective field of view, and generate an occupancy signal for every passage region where a target is present, and a clearing signal for every passage region where no target is present, and
• a control unit in signal communication with each radar device, the control unit storing therein a predetermined ordered entry sequence of events linked to respective passage regions and a predetermined ordered exit sequence of events linked to respective passage regions, the control unit being configured to switch a classification of the environment between clear and occupied by a target, by:
• registering a time sequence of occurring events linked to respective passage regions based on the occupancy signal and the clearing signal generated by each radar device for respective passage regions, wherein the events of the entry sequence, the events of the exit sequence and the events of the registered time sequence are first events and second events, wherein each one of the first events is linked to a specific passage region and given by a change from the clearing signal to the occupancy signal for the specific passage region, and each one of the second events is linked to a specific passage region and given by a change from the occupancy signal to the clearing signal for the specific passage region,
• when the environment is classified as clear, comparing an order of events and the passage regions linked to the events of the registered time sequence to an order of events and the passage regions linked to the events of the predetermined entry sequence and automatically changing the classification of the environment from clear to occupied by a target upon the order of events and the passage regions linked to the events of the registered time sequence matching the order of events and the passage regions linked to the events of the entry sequence, and
• when the environment is classified as occupied by a target, comparing the order of events and the passage regions linked to the events of the registered time sequence to an order of events and the passage regions linked to the events of the predetermined exit sequence, automatically changing the classification of the environment from occupied by a target to clear upon the order of events and the passage regions linked to the events of the registered time sequence matching the order of events and the passage regions linked to the events of the exit sequence, and not changing the classification of the environment from occupied by a target to clear upon the order of events and the passage regions linked to the events of the registered time sequence including one or more second events not matching the order of events and the passage regions linked to the events of the exit sequence.