Patent ID: 6822604
Filing Date: 2004-11-23
Classification: G01S,G08B,H04B

Abstract:
A method of intrusion detection, comprising:transmitting a first impulse radio signal from a first location; receiving the first impulse radio signal at a second location, said second location being separate from said first location, said first location and said second location associated with a protection zone; generating a first waveform which is a time domain representation of the received first impulse radio signal that indicates a multipath structure of a propagation channel of the transmitted first impulse radio signal; transmitting a second impulse radio signal from the first location; receiving the second impulse radio signal at the second location; generating a second waveform which is a time domain representation of the received second impulse radio signal that indicates a multipath structure of a propagation channel of the transmitted second impulse radio signal; and comparing the first waveform and the second waveform to determine whether there is a change between the first waveform and the second waveform indicative of an intruder entering the protection zone.