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US 6,614,384 B2Granted
System and method for detecting an intruder using impulse radio technology
AssigneeTime Domain Corporation
InventorsDavid J. Hall, Scott M. Yano, Hans G. Schantz
Life of this patent
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Abstract
An intrusion detection system and method are provided that can utilize impulse radio technology to detect when an intruder has entered a protection zone. In addition, the intrusion detection system and method can utilize impulse radio technology to determine a location of the intruder within the protection zone and also track the movement of the intruder within the protection zone. Moreover, the intrusion detection system and method can utilize impulse radio technology to create a specially shaped protection zone before trying to detect when and where the intruder has penetrated and moved within the protection zone.
Claims22
A security system comprising:
- a transmitting impulse radio unit for transmitting an impulse radio signal including a series of impulses;
- a receiving impulse radio unit for receiving the impulse radio signal at and after a predetermined time and generating a first waveform which is a time domain representation of the received impulse radio signal that indicates an actual distortion of the transmitted impulse radio signal that was transmitted within a protection zone at and after the predetermined time;
- said receiving impulse radio unit for receiving the impulse radio signal at and after a subsequent time and generating a second waveform which is a time domain representation of the received impulse radio signal that indicates an actual distortion of the transmitted impulse radio signal that was transmitted within the protection zone at and after the subsequent time;
- and
- a processor for comparing the first waveform to the second waveform to determine whether there is a change between the first waveform and the second waveform caused by an intruder entering the protection zone.
2 more elements
A method for detecting an intruder, said method comprising the steps of:
- transmitting, from a transmitting impulse radio unit, an impulse radio signal including a series of impulses;
- receiving, at a receiving impulse radio unit during a first interval of time, the impulse radio signal;
- generating, at the receiving impulse radio unit, a first waveform which is a time domain representation of the received impulse radio signal that indicates an actual distortion of the transmitted impulse radio signal that was transmitted within a protection zone during the first interval of time;
- receiving, at the receiving impulse radio unit during a second interval of time, the impulse radio signal;
- generating, at the receiving impulse radio unit, a second waveform which is a time domain representation of the received impulse radio signal that indicates an actual distortion of the transmitted impulse radio signal that was transmitted within the protection zone during the second interval of time;
- and
- comparing the first waveform to the second waveform to determine whether there is a change between the first waveform and the second waveform caused by the intruder entering the protection zone.
4 more elements
A security system comprising:
- a transmitting impulse radio unit that transmits an impulse radio signal;
- a plurality of receiving impulse radio units each of which receives the impulse radio signal at and after a predetermined time and generates a first waveform which is a time domain representation of the received impulse radio signal that indicates an actual distortion of the transmitted impulse radio signal that was transmitted within a protection zone at and after the predetermined time;
- each of said plurality of receiving impulse radio units receives the impulse radio signal at and after a subsequent time and generates a second waveform which is a time domain representation of the received impulse radio signal that indicates an actual distortion of the transmitted impulse radio signal that was transmitted within the protection zone at and after the subsequent time, each receiving impulse radio unit further includes:
- a processor compares the first waveform to the second waveform to determine whether an intruder entered the protection zone and then determines a distance between the intruder and the respective receiving impulse radio unit by calculating an elapsed time between an initial wavefront and a multipath reflection part of the second waveform generated by the respective receiving impulse radio unit caused by the intruder;
- each of said plurality of receiving impulse radio units transmits the determined distance between the intruder and the respective receiving impulse radio unit to said transmitting impulse radio unit;
- and
- said transmitting impulse radio unit calculates a current position of the intruder using the determined distances.
4 more elements
An intrusion detection system comprising:
- a transmitting impulse radio unit that transmits an impulse radio signal including a series of impulses;
- and
- a receiving impulse radio unit that compares at least two waveforms each of which is a time domain representation of the received impulse radio signal that indicates an actual distortion of the transmitted impulse radio signal that was transmitted during a predetermined time interval within a protection zone to determine whether the protection zone has been breached by an intruder.
Dependencies are inferred from the claim text.