Patent ID: 9726544
Date: 2017-08-08
CPC Classifications: G01J,G08B

Claim:
1. A system for detecting and tracking motion in a given area, said system comprising: a first passive motion detection sensor, mounted on a ceiling of said given area, operable for passively detecting motion in any of a first multiplicity of detection zones, each of said first multiplicity of detection zones being arranged along a corresponding one of a first multiplicity of mutually parallel axis, and, responsive to said passively detecting motion in at least one of said first multiplicity of detection zones, for providing a first detection output signal comprising an indication of a first detection zone of said first multiplicity of detection zones in which said motion was detected; a second passive motion detection sensor, mounted on said ceiling of said given area, operable for passively detecting motion in any of a second multiplicity of detection zones, each of said second multiplicity of detection zones at least partially overlapping each of said first multiplicity of detection zones, each of said second multiplicity of detection zones being arranged along a corresponding one of a second multiplicity of mutually parallel axes, each of said second multiplicity of mutually parallel axes being orthogonal to each of said first multiplicity of mutually parallel axis, and, responsive to said passively detecting motion in at least one of said second multiplicity of detection zones, for providing a second detection output signal comprising an indication of a second detection zone of said second multiplicity of detection zones in which said motion was detected; and a processor operable for receiving said first and second detection output signals comprising corresponding indications of said first and second detection zones arranged along said mutually orthogonal axis from said at least first and second passive motion detection sensors and, responsive thereto, for providing an indication of an overlapping region of said first and second detection zones in which said motion was detected, obviating the need for employing a passive triangulation method of calculation to calculate said overlapping region of said first and second detection zones in which said motion was detected.