Patent ID: 6573857
Filing Date: 2003-06-03
Classification: G01S,G08B

Abstract:
An instrusion detection system comprising:a first ultra wideband (UWB) radar, wherein said first UWB radar is adapted to transmit UWB pulses and receive signal returns, and wherein said UWB pulses have a wavelength corresponding to the center frequency of said UWB pulses; a second UWB radar, spaced a distance from said first UWB radar, said distance being greater than Â¼ of said wavelength, wherein said second UWB radar is adapted to transmit further UWB pulses, and wherein said further UWB pulses have said wavelength; and a processor in communications with at least said first UWB radar, wherein said processor, based on said signal returns, tracks movement of an object near a boundary having first and second sides, and wherein said processor triggers an alarm when it detects movement toward and penetration of the first side of the boundary by the object, but does not trigger the alarm when it detects movement toward and penetration of the second side of the boundary.