2-D PROJECTILE TRAJECTORY CORRECTION SYSTEM AND METHOD

摘要

A 2-D correction system uses intermittent deployment of aerodynamic surfaces (18) to control a spin or fin stabilized projectile (10) in flight; correcting both crossrange and downrange impact errors. Intermittent surface deployment develops rotational moments, which create body lift that nudge the projectile (10) in two-dimensions to correct the projectile (10) in its ballistic trajectory. In low spin rate projectiles ('fin stabilized'), the rotational moment directly produces the body lift that moves the projectile (10). In high spin rate projectiles ('spin stabilized'), the rotational moment creates a much larger orthogonal precession that in turn produces the body lift that moves the projectile (10). The aerodynamic surfaces are suitably deployed over multiple partial roll cycles at precise on (deployed) and off (stowed) positions in the cycle to nudge the projectile (10) up or down range or left or right cross range until the desired ballistic trajectory is restored.