Image guided weapon system and method

• US 6,157,875 A
• Filed: 07/17/1998
• Issued: 12/05/2000
• Est. Priority Date: 07/17/1998
• Status: Expired due to Term

• Current Assignee: the united states of america as represented by the secretary of the navy
• Original Assignee: the united states of america as represented by the secretary of the navy
• Inventors: Hedman, Brent R., Nash, Charles T.
• Primary Examiner(s): Nguyen, Tan
• Assistant Examiner(s): Beaulieu, Yonel
• Application Number:
  US09/118,096
• Time in Patent Office: 872 Days
• Field of Search: 701/1, 701/6, 701/200, 701/213, 701/215, 342/62, 342/64, 342/67, 342/357.02, 342/357.06, 244/3.1, 244/3.15, 244/3.2, 102/382
• US Class Current: 701/1
• CPC Class Codes: F41G 7/007 Preparatory measures taken before the launching of the guided missiles
• CPC Class Codes: F41G 7/2226 comparing the observed data with stored target data, e.g. target configuration data
• CPC Class Codes: F41G 7/2253 Passive homing systems, i.e. comprising a receiver and do not requiring an active illumination of the target
• CPC Class Codes: F41G 7/2293 using electromagnetic waves other than radio waves

Abstract

An image guided weapon system employing passive optical terminal guidance d method which provides the precision strike capability without requiring the use of a designator or the presence of an additional designator aircraft, which can operate through the weather, which allows rapid attack of multiple targets, and which does not require any aircraft to remain in the target area after a weapon has been launch. A target area is designated and an image of the target area is generated. An aimpoint within the target area is selected and GPS coordinates of the aimpoint are determined. An image template is generated using flight orientation data, the image of the target area, and GPS coordinates of aimpoint. Image processing software creates an image template which is downloaded to a weapon. The weapon'"'"'s seeker generates seeker images which are compared to the image template. Once a satisfactory correlation between the image template and the seeker image is made, the aimpoint coordinates are updated and the weapon is guided to the target.

Claims

1. A system for guiding a weapon employing passive optical terminal guidance, comprising:

(a) an imaging device that generates a digital image of a target area;

(b) an aimpoint selection device that selects an aimpoint in said target area;

(c) a GPS detector that establishes positional coordinates;

(d) a first processor that generates an image template from said digital image, said aimpoint, and said positional coordinates;

(e) a seeker onboard said weapon, that generates real-time images of said target area; and

(f) a second processor that correlates said image template with said real-time images from said seeker.

2. A system for guiding a weapon as recited in claim 1, wherein said first processor comprises a mission planner processor, said mission planner processor interfaced with said imaging device, said aimpoint selection device, and said detector.

3. A system for guiding a weapon as recited in claim 1, wherein said second processor for correlating said image template with said real-time images from said seeker comprises a weapon processor, said weapon processor onboard said weapon, said weapon processor interfaced with said mission planner processor and said seeker, said weapon processor including image correlating software.

4. A system for guiding a weapon as recited in claim 3, further comprising a navigation device for guiding said weapon to said aimpoint according to said image template and said real-time images from said seeker, said navigation device interfaced with said weapon processor.

5. A system for guiding a weapon as recited in claim 2, further comprising an inertial navigation system (INS), said INS interfaced with said mission planner processor.

6. A system for guiding a weapon as recited in claim 3, wherein said mission planner processor further comprises image template generating software, said image template generating software comprising:

a) a first program for marking an aimpoint from said aimpoint selection device into a digital image from said imaging device;

b) a second program for adding positional coordinates from said detector to said digital image; and

c) a third program for generating an image template form said digital image, said aimpoint marked on said digital image, and said positional coordinates added to said digital image.

7. A system for guiding a weapon as recited in claim 4, wherein said navigation device comprises:

(a) an inertial navigation system (INS) for updating positional coordinates of said weapon; and

(b) a servo system for steering said weapon.

8. A system for guiding a weapon employing passive optical terminal guidance, comprising:

(a) an imaging device that generates a digital image of a target area;

(b) an aimpoint selection device that selects an aimpoint in said target area;

(c) a GPS detector that establishes GPS coordinates;

(d) a first processor that generates an image template from said digital image, said aimpoint, and said GPS coordinates;

(e) a seeker onboard said weapon, that generates real-time images of said target area;

(f) a second processor that correlates said image template with said real-time images from said seeker; and

(g) a navigation device that guides said weapon to said aimpoint using said image template and said real-time images from said seeker.

9. A system for guiding a weapon as recited in claim 8, wherein said first processor comprises a mission planner processor, said mission planner processor interfaced with said imaging device, said aimpoint selection device, and said GPS detector.

10. A system for guiding a weapon as recited in claim 9, further comprising an inertial navigation system (INS), said INS interfaced with said mission planner processor.

11. A system for guiding a weapon as recited in claim 10, wherein said mission planner processor further comprises image template generating software, said image template generating software comprising:

(a) a first program for marking an aimpoint from said aimpoint selection device into a digital image from said imaging device;

(b) a second program for adding said GPS coordinates from said GPS detector to said digital image; and

(c) a third program for generating an image template form said digital image, said aimpoint marked on said digital image, and said GPS coordinates added to said digital image.

12. A system for guiding a weapon as recited in claim 8, wherein said second processor for correlating said image template with said real-time images from said seeker (means) comprises a weapon processor, associated with said weapon, said weapon processor interfaced with a mission planner processor, said weapon processor interfaced with said navigation device, said weapon processor including image correlating software.

13. A system for guiding a weapon as recited in claim 12, wherein said navigation device comprises:

(a) an inertial navigation system (INS) for updating said GPS coordinates of said weapon; and

(b) a servo system for steering said weapon.

14. A method for guiding a weapon employing passive optical terminal guidance to a target, comprising the steps of:

(a) generating a digital image of a target to include an area surrounding said target;

(b) selecting an aimpoint to designate said target;

(c) acquiring GPS coordinates for said aimpoint;

(d) generating an image template from said digital image, said aimpoint, and said GPS coordinates;

(e) detecting images of said target with a passive optical seeker onboard said weapon; and

(f) correlating said images from said passive optical seeker with said image template.

15. A method for guiding a weapon to a target as recited in claim 14, further comprising the steps of rotating and scaling said image template.

16. A method for guiding a weapon to a target as recited in claim 15, further comprising the step of downloading said image template to said weapon.

17. A method for guiding, a weapon to a target as recited in claim 16, further comprising the step of navigating said weapon to said aimpoint according to said correlated images from said passive optical seeker and said downloaded, rotated, and scaled image template.