Abstract: A radar system controls accesses to an environment where a machinery can be present. Radar devices are placed along an access path to the environment. The radar devices check the presence of targets in passage regions, arranged to be sequentially met along the access path. A control unit has stored predetermined ordered entry and exit sequences of events, given by changes of the passage regions between occupied and clear. If the registered sequence matches the entry sequence, that is the passage regions are occupied in the correct order, the environment is classified as occupied, and the machinery stops working. The machinery restarts when the environment is classified again as clear, based on the registered sequence matching the exit sequence, that is the passage regions being cleared in order.

Abstract: A radar system controls accesses to an environment where a machinery can be present. Radar devices are placed along an access path to the environment. The radar devices check the presence of targets in passage regions, arranged to be sequentially met along the access path. A control unit has stored predetermined ordered entry and exit sequences of events, given by changes of the passage regions between occupied and clear. If the registered sequence matches the entry sequence, that is the passage regions are occupied in the correct order, the environment is classified as occupied, and the machinery stops working. The machinery restarts when the environment is classified again as clear, based on the registered sequence matching the exit sequence, that is the passage regions being cleared in order.