Laser perimeter awareness system
First Claim
1. Method of laser scanning a perimeter zone of a target site for the detection of an object, said method comprising the steps of:
- pulsing a laser beam at a predetermined pulse repetition rate;
oscillating said pulsed laser beam through a predetermined angle in a first direction;
scanning said oscillating pulsed laser beam in a second direction across said perimeter zone;
receiving echoes from said pulsed laser beam during said perimeter zone scan;
deriving range data corresponding to said received echoes;
determining two-dimensional position data of said received echoes in said perimeter zone;
forming a three-dimensional scene image of a scan of said perimeter zone based on said range and two-dimensional position data of said received echoes thereof;
repeating the steps of scanning, deriving, determining and forming for a plurality of perimeter zone scans to form three-dimensional scene images of each scan of said plurality; and
comparing the three-dimensional scene images of said plurality to detect the object in said perimeter zone.
1 Assignment
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Accused Products
Abstract
A method of laser scanning a perimeter zone of a target site for the detection of potential threats comprises: scanning a pulsed laser beam across the perimeter zone; receiving echoes from the pulsed laser beam during the perimeter zone scan; deriving range data corresponding to the received echoes; determining position data of the received echoes in the perimeter zone; forming a scene image of a scan of the perimeter zone based on the range and position data of the received echoes thereof; repeating the steps of scanning, receiving, deriving, determining and forming for a plurality of perimeter zone scans to form scene images of each scan of the plurality; and comparing scene images of the plurality to detect a potential threat in the perimeter zone. In addition, a method of authenticating a potential threat detected in a perimeter zone of a target site comprises: detecting the potential threat and upon detection, interrogating the potential threat for a response by a wireless transmission; declaring the potential threat unauthorized if no response is transmitted wirelessly within a predetermined time interval from the interrogation; receiving the response, if transmitted, and determining if the response comprises a proper access code; and declaring the potential threat unauthorized if the received response is determined not to comprise the proper access code.
59 Citations
38 Claims
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1. Method of laser scanning a perimeter zone of a target site for the detection of an object, said method comprising the steps of:
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pulsing a laser beam at a predetermined pulse repetition rate;
oscillating said pulsed laser beam through a predetermined angle in a first direction;
scanning said oscillating pulsed laser beam in a second direction across said perimeter zone;
receiving echoes from said pulsed laser beam during said perimeter zone scan;
deriving range data corresponding to said received echoes;
determining two-dimensional position data of said received echoes in said perimeter zone;
forming a three-dimensional scene image of a scan of said perimeter zone based on said range and two-dimensional position data of said received echoes thereof;
repeating the steps of scanning, deriving, determining and forming for a plurality of perimeter zone scans to form three-dimensional scene images of each scan of said plurality; and
comparing the three-dimensional scene images of said plurality to detect the object in said perimeter zone. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A system for laser scanning a perimeter zone of a target site for the detection of an object, said system comprising:
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a laser source for generating a pulsed laser beam;
an oscillating unit for oscillating said pulsed laser beam through a predetermined angle in a first direction;
a scanning unit for scanning said oscillating pulsed laser beam in a second direction across said perimeter zone and for receiving echoes from said pulsed laser beam during said perimeter zone scan, said scanning unit operative to generate electrical position signals corresponding to two-dimensional positions of said received echoes in the perimeter scan;
a light detector for converting said received echoes into electrical echo signals representative thereof; and
a signal processor for receiving the electrical echo signals and corresponding position signals and for forming three-dimensional scene image data corresponding to a plurality of perimeter zone scans based on said electrical echo signals and corresponding two-dimensional position signals;
said signal processor operative to compare the three-dimensional scene image data of said plurality of perimeter zone scans to detect the object in said perimeter zone. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. Method of laser scanning a perimeter zone of water from a search vehicle for the detection of an object in the water, said method comprising the steps of:
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oscillating a pulsed laser beam through a predetermined angle in a first direction;
scanning said oscillating pulsed laser beam in a second direction across a surface of said perimeter zone of water;
receiving echoes from said pulsed laser beam during said perimeter zone scan;
deriving range data corresponding to said received echoes;
determining two-dimensional position data of said received echoes in said perimeter zone;
forming three-dimensional scene image data of a scan of said perimeter zone based on said range and two-dimensional position data of said received echoes thereof; and
detecting the object in said perimeter zone of water from said scene image data. - View Dependent Claims (25, 26, 27, 28, 29)
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30. A system for laser scanning a perimeter zone of water from a search vehicle for the detection of an object in the water, said system comprising:
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a laser source for generating a pulsed laser beam;
an oscillating unit for oscillating said pulsed laser beam through a predetermined angle in a first direction;
a scanning unit for scanning said oscillating pulsed laser beam in a second direction across a surface of said perimeter zone of water and for receiving echoes from said pulsed laser beam during said perimeter zone scan, said scanning unit operative to generate electrical position signals corresponding to two-dimensional positions of said received echoes in the perimeter scan;
a light detector for converting said received echoes into electrical echo signals representative thereof;
a signal processor for receiving the electrical echo signals and corresponding position signals and for forming three-dimensional scene image data corresponding to a perimeter zone scan based on said electrical echo signals and corresponding two-dimensional position signals; and
said signal processor operative to process the three-dimensional scene image data to detect the object in the perimeter zone of water. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38)
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Specification