Self compensating target acquisition system for minimizing areas of threat

• US 6,222,464 B1
• Filed: 12/02/1999
• Issued: 04/24/2001
• Est. Priority Date: 12/02/1999
• Status: Expired due to Term

• Current Assignee: Sikorsky Aircraft Corporation (Martin Marietta Corporation)
• Original Assignee: Sikorsky Aircraft Corporation (Martin Marietta Corporation)
• Inventors: Silder, Stephen H., Tinkel, Jack Byron, Rios, Jeffrey Paul
• Primary Examiner(s): Hofsass, Jeffery
• Assistant Examiner(s): TWEEL JR, JOHN ALEXANDER
• Application Number:
  US09/453,326
• Time in Patent Office: 509 Days
• Field of Search: 340/945, 340/961, 340/963, 340/968, 340/970, 342/65, 342/29, 701/4, 701/14, 701/301
• US Class Current: 340/945
• CPC Class Codes: F41G 7/343 comparing observed and stored data of target position or of distinctive marks along the path towards the target

Abstract

A method of automated scan compensation in a target acquisition system for reducing areas of potential threat surrounding an aircraft. The target acquisition system is located on an aircraft and adapted to receive data from a plurality of sensors. The target acquisition system includes a scanning device with adjustable scan limits for scanning a desired area in the vicinity of the aircraft. The method involves determining the aircraft'"'"'s current position, altitude, and heading. The terrain in the vicinity of the aircraft is then scanned and a line of sight between the aircraft and the scanned terrain is determined. Changes in the terrain which prevent other areas of the terrain in the vicinity of the aircraft from being scanned are also determined. The method then involves determining adjustments to the scan limits on the target acquisition system to reduce the size of the unscanned areas, and adjusting the scan limits as the aircraft flies over the terrain.

Claims

1. A method of automated scan compensation in a target acquisition system for reducing areas of potential threat surrounding an aircraft, the target acquisition system being located on the aircraft and adapted to receive data from a plurality of sensors, the target acquisition system including a device for scanning a desired area in the vicinity of the aircraft, the device having adjustable scan limits, the method comprising the steps of:

determining the aircraft'"'"'s current position;

determining the aircraft'"'"'s current altitude;

determining the aircraft'"'"'s current heading;

scanning the terrain in the vicinity of the aircraft;

determining a line of sight between the aircraft and the scanned terrain;

determining changes in the terrain which prevent other areas of the terrain in the vicinity of the aircraft from being scanned;

determining adjustments to the scan limits on the target acquisition system to reduce the size of the unscanned areas; and

adjusting the scan limits as the aircraft flies over the terrain.

2. A method of automated scan compensation according to claim 1 further comprising the step of determining existing environmental conditions which may effect the scanning resolution.

3. A method of automated scan compensation according to claim 2 wherein the step of determining the environmental conditions involves determining the current humidity level.

4. A method of automated scan compensation according to claim 1 wherein the aircraft'"'"'s current heading is determined based on a predetermined mission plan.

5. A method of automated scan compensation according to claim 1 wherein the step of determining the changes in the terrain which prevent other areas of the terrain in the vicinity of the aircraft from being scanned involves analyzing a digital terrain map.

6. A method of automated scan compensation according to claim 1 the step of determining adjustments to scan limits includes determining whether the terrain minimizes the likelihood of a threat and, adjusting the scan limits based on at least that determination.

7. A method of automated scan compensation in a target acquisition system for reducing areas of potential threat surrounding an aircraft, the target acquisition system being located within a computer on the aircraft and adapted to receive data from a plurality of sensors, the target acquisition system including a device for scanning a desired area in the vicinity of the aircraft, the device having adjustable scan limits, the method comprising the steps of:

selecting data from a digital terrain database representing the terrain in the vicinity of the aircraft;

determining the aircraft'"'"'s current position;

determining the aircraft'"'"'s current altitude;

determining the aircraft'"'"'s current heading;

determining a line of sight between the aircraft and the terrain data from the terrain database;

determining changes in the terrain in the vicinity of the aircraft which prevent areas of the terrain in the vicinity of the aircraft from being scanned because of terrain obstructions;

determining adjustments to the scan limits on the target acquisition system to reduce the size of the unscanned areas; and

adjusting the scan limits as the aircraft flies over the terrain.

8. A method of automated scan compensation according to claim 7 further comprising the step of determining existing environmental conditions which may effect the scanning resolution.

9. A method of automated scan compensation according to claim 8 wherein the step of determining the environmental conditions involves determining the current humidity level.

10. A method of automated scan compensation according to claim 7 wherein the aircraft'"'"'s current heading is determined based on a predetermined mission plan.

11. A method of automated scan compensation according to claim 7 wherein the step of determining the changes in the terrain which prevent other areas of the terrain in the vicinity of the aircraft from being scanned involves analyzing the selected data from the digital terrain database.

12. A method of automated scan compensation according to claim 7 the step of determining adjustments to scan limits includes determining whether the terrain minimizes the likelihood of a threat and, adjusting the scan limits based on at least that determination.