A device for ignition triggering ballistic projectile

A forerunner projectile detaches itself from the main projectile upon firing and travels ahead of this in unfettered manner at a specific differential velocity, until, upon target impact it generates a radiation pulse. The main projectile is provided with a receiving device 20 for the radiation pulse, a two-stage integrator 10, 12, 14 with a first integration stage 10, 12 which represents integration of the velocity difference between the projectiles during the flight until the receipt of the radiation pulse and a second integration stage 10, 14 which provides the difference between the content of the first integration stage and the time integral of the projectile velocity as from the instant of the pulse reception, as well as a threshold-value detector 22 which emits a detonation pulse as soon as the difference provided by the second integration stage falls below a predetermined limiting value, in accordance with the required detonation triggering distance.