SYSTEM AND METHOD FOR INTRUSION DETECTION USING A TIME DOMAIN RADAR ARRAY
First Claim
38. An intrusion 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 ¼
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.
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Accused Products
Abstract
A system and method for highly selective intrusion detection using a sparse array of time modulated ultra wideband (TM-UWB) radars. Two or more TM-UWB radars are arranged in a sparse array around the perimeter of a building. Each TM-UWB radar transmits ultra wideband pulses that illuminate the building and the surrounding area. Signal return data is processed to determine, among other things, whether an alarm condition has been triggered. High resolution radar images are formed that give an accurate picture of the inside of the building and the surrounding area. This image is used to detect motion in a highly selective manner and to track moving objects within the building and the surrounding area. Motion can be distinguished based on criteria appropriate to the environment in which the intrusion detection system operates.
30 Citations
73 Claims
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38. An intrusion detection system comprising:
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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 ¼
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. - View Dependent Claims (39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54)
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55. A method for detecting motion of an object using at least first and second ultra wide band (UWB) radars that are separated from one another, comprising the steps of:
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(a) receiving first UWB pulses at the first and second UWB radars, the first UWB pulses generated by an UWB transmitter moving along a calibration path, the calibration path defining an area to be monitored;
(b) determining positions of the first and second UWB radars in relation to each other and the calibration path based on the first UWB pulses received at the first and second UWB radars;
(c) transmitting second UWB pulses from the first UWB radar;
(d) transmitting third UWB pulses from the second UWB radar;
(e) receiving signal returns at at least one of the first and second UWB radars; and
(f) detecting motion within the area to be monitored based on the received signal returns. - View Dependent Claims (56, 57, 58, 59, 60, 61, 62)
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63. A system for detecting motion of an object, comprising:
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a first ultra wide band (UWB) radar adapted to receive first UWB pulses from an UWB transmitter moving along a calibration path defining a region to be monitored, said first UWB radar also adapted to transmit second UWB pulses;
a second UWB radar separated from said first UWB radar, said second UWB radar adapted to receive said first UWB pulses from the UWB transmitter moving along the calibration path, said first UWB radar also adapted to transmit third UWB pulses; and
a processor in communications with said first and second UWB radars;
wherein said first and second UWB radars are also adapted to determine calibration data from the first UWB pulses, to receive signal returns, and to forward the calibration data and signal return data to said processor, wherein said processor is adapted to determine positions of said first and second UWB radars in relation to each other and the calibration path based on the calibration data, and to detect motion within the region to be monitored based on the signal return data. - View Dependent Claims (64, 65, 66, 67, 68, 69, 70, 71, 72, 73)
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Specification