GB1306674A - Method and device for correcting the aim of a weapon - Google Patents

Abstract

1306674 Electric correspondence control systems FRANCE ARMED FORCES MINISTER OF 17 April 1969 [25 April 1968 19773/69 Heading G1N A method of aiming a gun against a movable target consists in following the target with a telescope having cross-hairs displaceable relative to the centre of the telescope field and causing the gun to follow the telescope; measuring the target distance and producing from this measurement and the known speed of the projectile a first signal corresponding to the time necessary for the projectile to reach the target; measuring the angular speed of the gun to produce a second signal; multiplying the first signal by the second signal to obtain a correcting signal; and, using the correction signal to displace the cross-hairs of the telescope away from the centre of the telescope field in a direction opposite to the pursuing direction whereby the gun leads the telescope by an angle which compensates for the movement of the target during flight time of the projectile. As shown in Fig.2 a telescope 20 having movable cross-hairs 17 is trained on a moving target to cause similar movement of a gun turret 21 through a servo-system 22, 23. Members 24, 25 determine the target distance and hence the projectile flight time T, in known manner. A power take-off 7 driven by turret 21 drives the input rotary plate of a ball-type stepup multiplier mechanism 8, at a speed Ko # proportional to the turret speed #. The balls of mechanism 8 are displaced a distance corresponding to time T to produce a mechanical output Ko # T which is applied to the rotor of a synchrogenerator 9 having its stator windings connected to the stator windings of a synchro-motor 10. The generator 9 and motor 10 constitute a Selsyn system and function as divergence detectors. The rotor windings of generator 9 are connected to a reference voltage Uref and the rotor windings of motor 10 are connected to an amplifier 11 connected to a motor-generator reducing unit 12. The mechanical output of unit 12 is connected through a reducing gear 13 to the rotatable stator of motor 10 and through a screw and nut gearing 14 to the cross-hairs 17 and to the displaceable balls of a mechanical integrator 15 similar in construction to the multiplier mechanism 8. The input rotary plate of integrator 15 is driven at constant speed by a motor 16 and the output rotary plate is connected to the rotor of the rotor 10. In a modification the telescope has an additional pair of fixed cross-hairs which are caused to follow the target until the moment of firing when the movable cross-hairs are locked in position and the telescope is moved to align the movable cross-hairs with the target.