CA2526075A1 - Laser perimeter awareness system - Google Patents

Laser perimeter awareness system Download PDF

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Publication number
CA2526075A1
CA2526075A1 CA002526075A CA2526075A CA2526075A1 CA 2526075 A1 CA2526075 A1 CA 2526075A1 CA 002526075 A CA002526075 A CA 002526075A CA 2526075 A CA2526075 A CA 2526075A CA 2526075 A1 CA2526075 A1 CA 2526075A1
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CA
Canada
Prior art keywords
perimeter zone
operative
potential threat
scanning
access code
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Granted
Application number
CA002526075A
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French (fr)
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CA2526075C (en
Inventor
Mark D. Ray
James R. Jamieson
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Rosemount Aerospace Inc
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Rosemount Aerospace Inc.
Mark D. Ray
James R. Jamieson
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Publication of CA2526075A1 publication Critical patent/CA2526075A1/en
Application granted granted Critical
Publication of CA2526075C publication Critical patent/CA2526075C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/88—Lidar systems specially adapted for specific applications
    • G01S17/89—Lidar systems specially adapted for specific applications for mapping or imaging
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/74—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
    • G01S13/76—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems wherein pulse-type signals are transmitted
    • G01S13/78—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems wherein pulse-type signals are transmitted discriminating between different kinds of targets, e.g. IFF-radar, i.e. identification of friend or foe
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/86—Combinations of radar systems with non-radar systems, e.g. sonar, direction finder
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
    • G01S17/06—Systems determining position data of a target
    • G01S17/42—Simultaneous measurement of distance and other co-ordinates
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
    • G01S17/50—Systems of measurement based on relative movement of target
    • G01S17/58—Velocity or trajectory determination systems; Sense-of-movement determination systems
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/66—Tracking systems using electromagnetic waves other than radio waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/74—Systems using reradiation of electromagnetic waves other than radio waves, e.g. IFF, i.e. identification of friend or foe
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/86—Combinations of lidar systems with systems other than lidar, radar or sonar, e.g. with direction finders
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/4802—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/481—Constructional features, e.g. arrangements of optical elements
    • G01S7/4811—Constructional features, e.g. arrangements of optical elements common to transmitter and receiver
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/481—Constructional features, e.g. arrangements of optical elements
    • G01S7/4818—Constructional features, e.g. arrangements of optical elements using optical fibres

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Optical Radar Systems And Details Thereof (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Burglar Alarm Systems (AREA)
  • Radar Systems Or Details Thereof (AREA)

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 and forming for a plurality of perimeter zone scans to form scene images. In addition, a method of authenticating a potential threat detected in a perimeter zone of a target site comprises: detecting the potential threat, interrogating the potential threat by a wireless transmission; declaring the potential threat unauthorized if no response is transmitted within a predetermined time interval or if the received response is determined not to comprise the proper access code.

Claims (65)

1. Method of laser scanning a perimeter zone of a target site for the detection of an object, said method comprising the steps of:
scanning a pulsed laser beam 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 position data of said received echoes in said perimeter zone;
forming a scene image of a scan of said perimeter zone based on said range and position data of said 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 said plurality; and comparing scene images of said plurality to detect the object in said perimeter zone.
2. The method of claim 1 wherein the step of scanning includes the steps of:
oscillating a laser beam back and forth through a predetermined elevation angle; and scanning said oscillating laser beam across an azimuth angle to form a sinusoidal scan pattern across the perimeter zone.
3. The method of claim 1 wherein the step of deriving includes deriving the range data corresponding to received echoes based on laser pulse-to-echo time of flight derivations.
4. The method of claim 1 wherein the step of comparing includes the steps of:
assigning at least one scene image of said plurality as a reference scene;
detecting at least one moving object in the perimeter zone by a comparison of other scene images of said plurality to said reference scene image; and assigning a threat priority level to each detected moving object.
5. The method of claim 4 wherein the step of detecting includes the step of:
detecting the at least one moving object in the perimeter zone by detecting a change in at least one of the range and position thereof by the comparison of other scene images of said plurality to said reference scene image.
6. The method of claim 4 wherein the step of assigning includes the steps of:
tracking the at least one moving object in range and position with respect to the target site among the scene images of the plurality; and assigning a threat priority level to each detected moving object based on said track thereof.
7. The method of claim 4 wherein the step of assigning includes the steps of:

tracking the at least one moving object in range and position with respect to the target site among the scene images of the plurality;
assigning a threat priority level to each detected moving object based on a constant bearing, decreasing range (CBDR) algorithm; and queuing each detected moving object in a queue based on said assigned threat priority level thereof.
8. The method of claim 4 including the step of displaying an image representation of the at least one moving object on a display screen.
9. The method of claim 4 including the step of positioning a spotlight on one of the at least one moving object based on the threat priority level thereof.
10. The method of claim 4 including the step of positioning a camera to view one of the at least one moving object based on the threat priority thereof.
11. The method of claim 10 including the steps of displaying an image of the camera view on a display screen; and overlaying an image representation of the at least one moving object on top of the camera view in the display screen.
12. The method of claim 4 including the steps of:
determining the shape of the detected at least one moving object;
comparing said shape of the at least one moving object with known shapes; and determining if said at least one moving object is friendly based on results of said shape comparing step.
13. A system for laser scanning a perimeter zone of a target site for the detection of an object, said system comprising:
a laser source for generating a pulsed laser beam;
a scanning unit for scanning said pulsed laser beam 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 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 scene image data corresponding to a plurality of perimeter zone scans based on said electrical echo signals and corresponding position signals;
said signal processor operative to compare the scene image data of said plurality of perimeter zone scans to detect the object in said perimeter zone.
14. The system of claim 13 including a memory for storing the formed scene image data.
15. The system of claim 13 including fiber optic cabling for coupling the pulsed laser beams from laser source to the scanning unit.
16. The system of claim 13 including fiber optic cabling for coupling the received echoes from the scanning unit to the light detector.
17. The system of claim 13 wherein the scanning unit includes an optical element driven to oscillate the pulsed laser beam back and forth through a predetermined elevation angle, said optical element also driven to rotate the oscillating pulsed laser beam through a predetermined azimuth angle to cover the perimeter zone.
18. The system of claim 13 wherein the signal processor comprises a programmed digital processor operative to assign at least one scene image of the plurality as a reference scene, to detect at least one moving object in the perimeter zone by a comparison of other scene images of the plurality to said reference scene image; and to assign a threat priority level to each detected moving object.
19. The system of claim 18 includes a spotlight; and wherein the programmed digital processor is operative to position said spotlight on one of the at least one moving object based on the threat priority level thereof.
20. The system of claim 18 includes a camera; and wherein the programmed digital processor is operative to position said camera to view the at least one moving object based on the threat priority level thereof.
21. The system of claim 20 including a display unit coupled to the camera for displaying an image of the camera view on a screen thereof; and an overlay control unit coupled between the processor and the display unit for overlaying images and text onto the camera view image display; and wherein the processor is operative to provide image representations of the at least one moving object to the overlay control unit for being overlaid onto the camera view image display.
22. The system of claim 18 including a display unit; and wherein the processor is operative to display an image representation of the at least one moving object on a screen of the display unit.
23. The system of claim 13 including:
a plurality of scanning units, each scanning unit of said plurality for scanning a pulsed laser beam across a different perimeter zone surrounding the target site and for receiving echoes from the pulsed laser beam during said corresponding perimeter zone scan, each scanning unit operative to generate electrical position signals corresponding to positions of said received echoes in the corresponding perimeter scan;

at least one light detector for converting said received echoes from the plurality of scanning units into electrical echo signals representative thereof;
a signal processor for receiving the electrical echo signals and corresponding position signals and for forming scene image data corresponding to a plurality of scans of each different perimeter zone based on said electrical echo signals and corresponding position signals;
said signal processor operative to compare the scene image data of said plurality of scans of each different perimeter zone to detect the object in at least one of the different perimeter zones.
24. Method of authenticating a potential threat detected in a perimeter zone of a target site, said method comprising the steps of:
detecting the potential threat in the perimeter zone of the target site;
upon detection, interrogating said 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 said interrogation;
receiving said 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.
25. The method of claim 24 wherein the step of detecting includes detecting the potential threat in the perimeter zone of the target site by a scanning laser object awareness system.
26. The method of claim 24 wherein the step of interrogating includes encrypting a coded interrogation signal; and transmitting the encrypted interrogation signal to the potential threat.
27. The method of claim 26 wherein the step of receiving includes decrypting a transmitted coded response signal; and determining if the decrypted coded signal comprises the proper access code.
28. The method of claim 24 wherein the interrogation is transmitted wirelessly using an RF
carrier.
29. The method of claim 24 the interrogation is transmitted wirelessly using a coded light at a predetermined wavelength range.
30. The method of claim 24 wherein the step of determining if the response comprises a proper access code includes the steps of;
extracting the access code from the received response;
comparing the extracted access code with known proper access codes; and determining if the response comprises a proper access code based on the result of said comparing step.
31. The method of claim 24 including the steps of:
determining that the response comprises a proper access code;
determining a time of detection of the potential threat; and authenticating access to the potential threat based on said time of detection.
32. The method of claim 31 wherein the step of authenticating includes:
comparing the time of detection of the potential threat with a proper access time for the potential threat; and authenticating access to the potential threat based on the result of said detection time comparing step.
33. The method of claim 32 including the step of identifying the proper access time based on the proper access code of the detected potential threat and a predetermined time schedule of whereabouts thereof.
34. The method of claim 24 including the steps of:
determining that the response comprises a proper access code;
determining a position of the detected potential threat in the perimeter zone;
and authenticating access of the potential threat based on said position.
35. The method of claim 34 wherein the step of authenticating includes:
comparing the detected position of the potential threat with a proper access position for the potential threat; and authenticating access to the potential threat based on the result of said detected position comparing step.
36. The method of claim 35 including the step of identifying the proper access position based on the proper access code of the detected potential threat and a predetermined position schedule of whereabouts thereof.
37. A system for authenticating a potential threat detected in a perimeter zone of a target site, said system comprising:
a personal communicator for each person that has access to the perimeter zone, each said communicator operative to transmit wirelessly an authorized access code in response to a reception of a wirelessly transmitted interrogation signal;
a scanning laser object awareness system (LOAS) for detecting the potential threat in the perimeter zone of the target site and for generating a threat detection signal indicative of said detection;
a wireless transmitter/receiver unit;

an authenticator unit coupled to said scanning LOAS and said wireless transmitter/receiver unit, and responsive to said threat detection signal to control said wireless transmitter/receiver unit to transmit the interrogation signal to said potential threat;
said wireless transmitter/receiver unit operative to receive the response, if transmitted from a personal communicator within a predetermined area of the detected potential threat;
said authenticator unit operative to declare the potential threat unauthorized if no response is received within a predetermined time internal from said interrogation;
said authenticator unit further operative to declare the potential threat unauthorized if the received response is determined not to comprise an authorized access code.
38. The system of claim 37 including an encrypter unit disposed between the transmitter/receiver unit and the authenticator for encrypting a coded interrogation signal prior to transmission and for decrypting a received coded response signal.
39. The system of claim 37 wherein the transmitter/receiver unit is operative to transmit the interrogation signal wirelessly using an RF carrier.
40. The system of claim 37 wherein the transmitter/receiver unit is operative to transmit the interrogation signal wirelessly using a coded light at a predetermined wavelength range.
41. The system of claim 37 including a memory coupled to the authenticator unit for storing the authorized access codes of the personal communicators; and wherein the authenticator unit is operative to extract the access code from the received response, to compare the extracted access code with the stored authorized access codes; and to determine if the response comprises an authorized access code based on the result of said comparison.
42. The system of claim 37 wherein the authenticator unit is operative in response to the determination that the response comprises an authorized access code, to determine a time of detection of the potential threat; and to authenticate access to the potential threat based on said time of detection.
43. The system of claim 42 wherein the authenticator unit is operative to compare the time of detection of the potential threat with a proper access time for the person assigned the received authorized access code, and to authenticate access to the potential threat based on the result of said detection time comparison.
44. The system of claim 43 wherein the authenticator unit is operative to identify the proper access time based on the authorized access code received from the detected potential threat and a predetermined time schedule of whereabouts of the person assigned said authorized access code.
45. The system of claim 43 wherein the authenticator is operative to query a central security site for the predetermined time schedule of whereabouts of the person assigned the authorized access code of the received response signal.
46. The system of claim 37 wherein the authenticator unit is operative in response to the determination that the response comprises an authorized access code, to determine a position of the detected potential threat; and to authenticate access to the potential threat based on said position.
47. The system of claim 46 wherein the authenticator unit is operative to compare the position of the detected potential threat with an authorized access area for the person assigned the received authorized access code, and to authenticate access to the potential threat based on the result of said detection time comparison.
48. The system of claim 47 wherein the authenticator unit is operative to identify the authorized access area based on the authorized access code received from the detected potential threat and a predetermined schedule of whereabouts of the person assigned said authorized access code.
49. The system of claim 48 wherein the authenticator is operative to query a central security site for the predetermined schedule of whereabouts of the person assigned the authorized access code of the received response signal.
50. The system of claim 37 wherein the personal communicator comprises a two-way pager.
51. 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:
scanning a pulsed laser beam 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 position data of said received echoes in said perimeter zone;
forming scene image data of a scan of said perimeter zone based on said range and position data of said received echoes thereof; and detecting the object in said perimeter zone of water from said scene image data.
52. The method of claim 51 wherein the pulsed laser beam is scanned downward across the water surface from an aircraft search vehicle.
53. The method of claim 51 wherein the pulsed laser beam is scanned downward across the water surface from a marine search vehicle.
54. The method of claim 51 including the step of displaying an image representative of the detected object on a display screen.
55. The method of claim 51 including the step of detecting an individual in the perimeter zone of water from the scene image data.
56. The method of claim 51 including the steps of: repeating the steps of scanning, receiving, deriving, determining and forming for a plurality of perimeter zone scans to form scene image data of each scan of said plurality; and comparing scene image data of said plurality of scans to detect the object in said perimeter zone of water.
57. 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:
a laser source for generating a pulsed laser beam;
a scanning unit for scanning said pulsed laser beam 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 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 scene image data corresponding to a perimeter zone scan based on said electrical echo signals and corresponding position signals; and said signal processor operative to process the scene image data to detect the object in the perimeter zone of water.
58. The system of claim 57 including a spotlight disposed on the search vehicle; and wherein the signal processor is operative to position the spotlight to highlight the detected object in the water.
59. The system of claim 57 including a camera disposed on the search vehicle;
and wherein the signal processor is operative to position said camera to view the detected object in the water.
60. The system of claim 57 including a display unit; and wherein the processor is operative to display an image representation of the detected object on a screen of the display unit.
61. The system of claim 57 including:
a plurality of scanning units, each scanning unit of said plurality for scanning a pulsed laser beam across a different perimeter zone of water surrounding the search vehicle and for receiving echoes from the pulsed laser beam during said corresponding perimeter zone scan, each scanning unit operative to generate electrical position signals corresponding to positions of said received echoes in the corresponding perimeter scan;

at least one light detector for converting said received echoes from the plurality of scanning units into electrical echo signals representative thereof;
a signal processor for receiving the electrical echo signals and corresponding position signals and for forming scene image data corresponding to a scan of each different perimeter zone based on said electrical echo signals and corresponding position signals;
said signal processor operative to process the scene image data of each different perimeter zone to detect the object in at least one of the different perimeter zones.
62. The system of claim 57 wherein the search vehicle is an aircraft; and wherein the scanning unit is disposed on the aircraft to scan the pulsed laser beam downward across the water surface from the aircraft search vehicle.
63. The system of claim 57 wherein the search vehicle is a marine vessel; and wherein the scanning unit is disposed on the marine vessel to scan the pulsed laser beam downward across the water surface from the marine vessel.
64. The system of claim 57 wherein the signal processor is operative to process the scene image data to detect an individual in the perimeter zone of water.
65. The system of claim 57 wherein the processor is operative to form scene image data corresponding to a plurality of perimeter zone scans based on said electrical echo signals and corresponding position signals, and to compare the scene image data of said plurality of perimeter zone scans to detect the object in the perimeter zone of water.
CA2526075A 2003-05-19 2004-05-07 Laser perimeter awareness system Expired - Fee Related CA2526075C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US10/440,918 2003-05-19
US10/440,918 US6985212B2 (en) 2003-05-19 2003-05-19 Laser perimeter awareness system
PCT/US2004/014223 WO2004104633A2 (en) 2003-05-19 2004-05-07 Laser perimeter awareness system

Publications (2)

Publication Number Publication Date
CA2526075A1 true CA2526075A1 (en) 2004-12-02
CA2526075C CA2526075C (en) 2012-07-03

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US (2) US6985212B2 (en)
EP (2) EP2058676A1 (en)
JP (1) JP2007503004A (en)
AU (2) AU2004242390B2 (en)
CA (1) CA2526075C (en)
IL (1) IL171749A (en)
WO (1) WO2004104633A2 (en)

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