Patent ID: 7500423
Filing Date: 2009-03-10
Classification: F41G

Abstract:
1. A method of calculating in near real-time two possible angles of elevation of a projectile and associated times of flight so that the projectile can be made to act at a desired point, c h a r a c t e r i s e d in that the azimuth angle of a vertical plane, the XZ plane, in which the launching direction of the projectile lies, is determined in a prior-art manner, for instance by direct measuring the direction to a target on which the projectile is to act, the origin is fixed at the starting point of the projectile and the X axis is fixed to be parallel to the horizontal plane, the angle of elevation and the time of flight are calculated in a process which is divided into two main parts, a calculation part and a logic part, where the calculation part, starting from the diameter (d), mass (m), air drag coefficient (C where the logic part, starting from a maximum inaccuracy in the logic part (acc), a lower limit of the desired height (lh), the horizontal distance to the target (x when a calculated projectile position lies outside a predetermined boundary condition, and after that, until two solutions have been found, sets a second direction of elevation.