Patent ID: 7492306
Filing Date: 2009-02-17
Classification: G01S,G08B

Abstract:
1. A boundary monitoring apparatus comprising: a radar device arranged to transmit a signal into a detection region and to detect an object in said detection region upon receipt of a reflected signal from said object; means for defining a boundary in said detection region; means for determining a path of said object in the detection region; means for performing an evaluation to determine if said path intersects with said boundary; and means for raising an alarm depending on the evaluation, wherein said means for performing an evaluation is arranged to determine a minimum distance within said boundary of said path of said object from said radar device or other reference location, and wherein said means for raising an alarm raises an alarm if said path of the object is determined to intersect said boundary and if said minimum distance of said path is less than a threshold value, and does not raise said alarm if said path of the object is determined to intersect said boundary and if said minimum distance of the path is greater than said threshold value.