Fire control system with aiming error compensation

• US 4,922,801 A
• Filed: 08/01/1989
• Issued: 05/08/1990
• Est. Priority Date: 08/12/1988
• Status: Expired due to Term

• Current Assignee: Societe D'Applications Generales D'Electricite et de Mecanique Sagem
• Original Assignee: Societe D'Applications Generales D'Electricite et de Mecanique Sagem
• Inventors: Jaquard, Paul, Lelay, Jean-Pierre, Doreau, Jean
• Primary Examiner(s): Jordan, Charles T.
• Assistant Examiner(s): Carone, Michael J.
• Application Number:
  US07/387,771
• Time in Patent Office: 280 Days
• Field of Search: 89/41.05, 89/41.06, 89/41.07, 89/41.21, 89/41.22, 235/411, 235/412, 235/413, 364/423, 358/104, 358/46, 358/107, 358/125, 358/126
• US Class Current: 89/41.05
• CPC Class Codes: F41G 3/06 with rangefinder rangefinders per se G01C
• CPC Class Codes: F41G 5/08 Ground-based tracking-systems for aerial targets

Abstract

A fire control system for a weapon having an operator-aimed barrel compri a sighting piece carried by the barrel and having a reticle adjustable in position with respect to the bore axis of the barrel. A camera fast with the barrel has a field coaxial with the bore axis. The apparent movement of the target in the field of the camera is measured as well as the angular movements of the barrel by the operator. The position to be given to the reticle is computed from variations of the aiming direction of the barrel and from the apparent movement and the position of the reticle is consequently adjusted. The reticle may consist of a LCD.

Claims

1. A fire control system for a weapon having an operator-aimed barrel, comprising:

a sighting piece carried by the barrel and having a reticle adjustable in position with respect to the bore axis of the barrel, a camera fast with said barrel and having a field coaxial with said bore axis,

means for measuring the apparent movement of an image of a target in the field of the camera,

means for measuring angular movements of said barrel as controlled by said operator,

means for computing a position to be given to said reticle from variations of the aiming direction of the barrel provided by said angular movement measuring means and from said apparent movement,

and means for controlling the position of the reticle with respect to the direction of the bore axis responsive to an indication of position provided by said computing means.

2. A fire control system according to claim 1, wherein said means for measuring the angular movements of the barrel comprise tachymetric or gyrometric sensors.

3. A fire control system according to claim 1, comprising a supplemental large field camera, means for measuring a size of said image of the target and additional computing means for computing, from the apparent size of the target, from the focal length of the camera and from stored dimensions of the target, the distance of the target.

4. A fire control system according to claim 1, further comprising means for measuring an apparent size of the target in the field of the camera, means for storing an actual size of typical targets, means for selecting one of said actual sizes, and range finding means for computing the distance of the target imaged by the camera from the apparent size of the target, the focal length of the camera and said actual dimensions.

5. A fire control system according to claim 1, wherein said reticle consists of a liquid crystal matrix display having means for energizing at least one line and one column of the matrix.

6. A fire control system according to claim 1, wherein said reticle consists of a liquid crystal display having means for energizing at least one pixel of said matrix.

7. A fire control system according to claim 5, wherein said camera has a light intensifier tube and said system further comprises means for displaying the image of the field of the camera by selected energization of pixels of the matrix.