Method of making a projectile in a trajectory act at a desired point at a calculated point of time

The present invention relates to a method of calculating in near-real-tune two possible angles of elevation of a projectile and associated tunes of flight so that it can be made to act at a desired point. The invention starts from determining in a prior-art manner, which is not part of the invention, the azimuth angle of the launching direction of the projectile. The angle of elevation of the launching direction of the projectile and the tune of flight are calculated in a process which is divided into two main parts, a calculation part which discretely timed calculates positions and associated points of tune along a trajectory, and a logic part which sets a first direction of elevation, monitors the calculation of projectile positions and tune of flight and interrupts the calculation, when the projectile lies within a circle of acceptance with the desired point at the centre and determines the current values of direction of elevation and tune of flight as a solution, or when a calculated projectile position lies outside a predetermined boundary condition. Then the logic part sets a second direction of elevation until two solutions have been found.