Threat detection system

• US 7,492,308 B2
• Filed: 01/18/2007
• Issued: 02/17/2009
• Est. Priority Date: 01/18/2006
• Status: Active Grant

• Current Assignee: Rafael - Armament Development Authority Ltd.
• Original Assignee: Rafael Advanced Defense Systems Limited (Government of Israel)
• Inventors: Benayahu, Yair, Vuskoboinik, Asher
• Primary Examiner(s): Gregory; Bernarr E
• Application Number:
  US11/624,225
• Publication Number:
  US 20080191926A1
• Time in Patent Office: 761 Days
• Field of Search: 244 31- 33, 342/27, 342/28, 342 52- 67, 342/175, 342/195, 342 13- 20, 342/89, 342/90, 342104-115, 342/118, 342125-147, 342/157, 342/158, 342450-465, 89/11.1, 89/370.1, 89/410.1, 89/410.2, 89/410.6, 89/410.7, 250/200, 250/201.1, 250/203.1, 250/203.2, 250/203.3, 250/203.6, 250/206, 250/214.R, 250/214.1, 250/336.1, 250/338.1, 250/349, 250/361.R, 25036301-36303, 356/138, 356/139.04, 356/139.05, 356/140, 356/141.2, 356/141.5, 356/402, 356/416, 382/100, 382/103, 367/118, 367/128
• US Class Current: 342/52
• CPC Class Codes: F41H 11/02 Anti-aircraft or anti-guided missile or anti-torpedo defence installations or systems cartridges or missiles for producing smoke or for dispensing radar chaff or infrared material F42B5/15, F42B12/48, F42B12/70; informative reference: details of radar or sonar systems G01S7/00; jamming or electronic countermeasures G01S7/38, G01S7/495, H04K3/00
• CPC Class Codes: F41H 7/00 Armoured or armed vehicles general vehicle aspects B60; armoured or armed ships B63G; armoured or armed aircraft B64D; mounting guns, e.g. machine guns, on vehicles F41A23/00
• CPC Class Codes: G01S 13/66 Radar-tracking systems; Analogous systems
• CPC Class Codes: G01S 13/867 Combination of radar systems with cameras
• CPC Class Codes: G01S 3/784 using a mosaic of detectors
• CPC Class Codes: G08B 13/18 Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
• CPC Class Codes: H04N 7/18 Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast

Abstract

An optical detection system for detecting launch of an offensive projectile. The detection system includes an image detector array, an optical arrangement for focusing on to the image detector array, and a processing system associated with the image detector array. The processing system is configured to derive a series of frames from the image detector, to process the series of frames to identify a flash event and to generate and output that indicates a direction of the flash event.

Claims

1. A threat detection system for use in protecting a platform from offensive projectiles, the threat detection system comprising:

an optical detection subsystem for detecting launch of an offensive projectile, said optical detection subsystem including;

(a) an image detector array sensitive to radiation in at least one range of wavelengths within the spectrum from near-infrared to near-ultraviolet radiation;

(b) an optical arrangement for focusing on to said image detector array a substantially continuous field of view circumscribing said optical arrangement; and

(c) a processing system associated with said image detector array and configured;

(i) to derive a series of frames from said image detector array at a frame rate of at least 30 frames per second;

(ii) to process said series of frames to identify a flash event; and

(iii) to generate an output indicative of a direction in which the flash event occurred,

a radar detection subsystem including a radar arrangement configured to detect approaching offensive projectiles from a range of directions substantially circumscribing the platform, and

a threat verification module configured to verify the existence of an offensive projectile based upon data from both said optical detection subsystem and said radar detection subsystem.

2. The threat detection system of claim 1, wherein said image detector array and said optical arrangement are configured such that said frames have an angular pixel resolution such that each pixel corresponds to no more than 5 milliradians.

3. The threat detection system of claim 1, wherein said image detector array is integrally formed as part of a silicon chip.

4. The threat detection system of claim 1, wherein said image detector array is selected from the group consisting of:

a CCD detector and a CMOS detector.

5. The threat detection system of claim 1, wherein said image detector array is implemented as a CMOS detector.

6. The threat detection system of claim 1, wherein said processing system is further configured to determine whether said flash event satisfies at least one temporal flash signature criterion.

7. The threat detection system of claim 1, wherein said optical arrangement includes a band-pass spectral filter for selectively focusing on to said image detector array incident radiation in a first band of wavelengths.

8. The threat detection system of claim 7, further comprising a flash illumination arrangement for generating an illumination flash in at least the direction in which the flash event occurred, said illumination flash lying within said first band of wavelengths.

9. The threat detection system of claim 1, wherein said optical arrangement is configured to focus on to said image detector array a substantially continuous field of view circumscribing said optical arrangement and having an elevation range of at least 20°

.

10. The threat detection system of claim 1, wherein said optical arrangement is configured to focus on to said image detector array a substantially continuous field of view circumscribing said optical arrangement and having an elevation range of at least 30°

.

11. The threat detection system of claim 1, further comprising at least one additional imaging arrangement associated with said processing system and spaced apart from said optical arrangement, said processing system being further configured to co-process data derived from said additional imaging arrangement and said frames from said image detector array to derive range information for the flash event.

12. An active protection system comprising:

(a) the threat detection system of claim 1; and

(b) a countermeasure system responsive to said threat verification module to deploy at least one countermeasure for neutralizing or reducing the efficacy of the offensive projectile.

13. The active protection system of claim 12, wherein said countermeasure system includes a narrow-field-of-view gimbaled radar, said countermeasure system being configured to direct said gimbaled radar towards said direction in which the flash event occurred.

14. A method for protecting a platform from offensive projectiles, the method comprising the steps of:

(a) deploying an optical detection subsystem to detect flash events corresponding to the launch of offensive projectiles;

(b) deploying a radar detection subsystem including a substantially panoramic radar arrangement to detect approaching offensive projectiles from a range of directions substantially circumscribing the platform;

(c) verifying the existence of an offensive projectile based upon data from both said optical detection subsystem and said radar detection subsystem; and

(d) on verification of the existence of an offensive projectile, actuating at least one anti-projectile countermeasure so as to neutralize or reduce the efficacy of the offensive projectile.

15. The method of claim 14, wherein said optical detection subsystem includes a CCD image detector array.

16. The method of claim 14, wherein said optical detector subsystem includes a CMOS image detector array.

17. The method of claim 14, wherein said optical detection subsystem includes:

(a) an image detector array selected from the group consisting of;

a CCD detector and a CMOS detector; and

(b) an optical arrangement for focusing on to said image detector array a substantially continuous field of view circumscribing said optical arrangement.

18. An optical detection system for detecting launch of an offensive projectile, the detection system comprising:

(a) an image detector array selected from the group consisting of;

a CCD detector and a CMOS detector;

(b) an optical arrangement for focusing on to said image detector array a given field of view, said optical arrangement including a band-pass spectral filter for selectively focusing on to said image detector array incident radiation in a first band of wavelengths;

(c) a processing system associated with said image detector array and configured;

(i) to derive a series of frames from said image detector array at a frame rate of at least 30 frames per second;

(ii) to process said series of frames to identify a flash event; and

(iii) to generate an output indicative of a direction in which the flash event occurred; and

(iv) a flash illumination arrangement for generating an illumination flash in at least the direction in which the flash event occurred, said illumination flash lying within said first band of wavelengths.