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A system and method for providing a relative velocity sighting reference in an airborne gunsight system. A head-up display (HUD) frames the target in the pilot\s line of sight and a computer-driven cathode ray tube (CRT) display projects an array of sighting indices or dots on the HUD. The computer

A system and method for providing a relative velocity sighting reference in an airborne gunsight system. A head-up display (HUD) frames the target in the pilot\s line of sight and a computer-driven cathode ray tube (CRT) display projects an array of sighting indices or dots on the HUD. The computer receives air data and target tracking inputs and controls the CRT display so that the sighting array automatically overlays and follows the target and so that the indices thereof move in a direction and at a velocity to describe the motion of the line of sight of the target required for the target to intercept a bullet fired from the aircraft gun. The pilot maneuvers the aircraft to null the relative motion between the target and the sighting indices, whereby the gun is in position to fire.

대표청구항 ▼

A method for controlling the gunfire of an aircraft utilizing a headup display comprising the steps of: maneuvering said aircraft to align a target in said headup display; projecting a sighting index on said display; controlling the position of said sighting index on said display so that it appears

A method for controlling the gunfire of an aircraft utilizing a headup display comprising the steps of: maneuvering said aircraft to align a target in said headup display; projecting a sighting index on said display; controlling the position of said sighting index on said display so that it appears in the immediate vicinity of said target and moves in the direction and with the velocity that a target appearing at the same relative position on said display would have to have to intercept, one bullet flight-time later, a bullet fired from said aircraft, the motion of said sighting index being defined by the rate of change of traverse and elevation display coordinate angles lt and le as: [Figure] [Figure] where K =a constant less than 1 and greater than 0.67 r =yaw rate of said aircraft p =roll rate of said aircraft q =pitch rate of said aircraft lt′=transverse angle of target line of sight le′=elevation angle of target line of sight Tn =sensitivity in terms of predicted bullet time of flight Pr = precession rate [Figure] where Aw =lift acceleration of said aircraft Vf =bullet mean velocity relative to said aircraft Vm =muzzle velocity Va =true airspeed of said aircraft ag =gun angle of attack r