Oerlikon Contraves Pyrotec Ag

Rwm Schweiz Ag

Klaus Muenzel

Peter Ettmueller

Pierre H Freymond

Markus Engler

A method for correcting a pre-programmed time of disaggregation of a spin-stabilized projectile. For this purpose the deviation of the actual muzzle velocity from the theoretical muzzle velocity is taken into consideration. The actual muzzle velocity is determined with the aid of the effects of a magnetic field on the projectile indirectly by means of the actual rotation frequency of the projectile, wherein the actual rotation frequency of the projectile is determined during a time-limited calibration phase directly following the firing of the projectile. The device for executing this method includes means for storing the time of initiation, programmed on the basis of the theoretical rotation frequency of the projectile, means for determining the actual rotation frequency of the projectile, and means for correcting, or respectively updating of the theoretical time of initiation toward the actual time of initiation on the basis of the actual rotation frequency, or respectively muzzle velocity of the projectile. The employment of the device is intended to increase the effectiveness of a weapons system for attacking targets by means of fuse-time-fixed projectiles.

Method of correcting the pre-programmed initiation of an event in a spin-stabilized projectile, device for executing the method and use of the device

In this more cost-effective, less elaborate method, the disintegration time is calculated from a predetermined muzzle velocity and a distance to the target and is transmitted to a receiver coil prior to firing. The receiver coil is connected via a comparator circuit (7) and a decoder (8) with a shift register (9), whose output is connected to a first comparator (6), so that the disintegration time is present on the outputs of the latter. A first counter (1), which is connected with a clock generator (2) and a programmable counter (3), is unblocked or blocked by the start-stop pulses, supplied via the receiver coil, of a muzzle velocity measuring device. The programmable counter (3) forms a clock signal from the number of the clock pulses, added in the first counter (1) during the unblocked time, and of the clock generator frequency, whose frequency is equal to the muzzle velocity and is supplied via a is binary circuit (4) to a second counter (5). The output of the second counter (5) is connected with the first comparator (6), wherein a firing signal (Z) appears at the output of the first capacitor (6) when the counter reading of the second counter (5) and the reading of the shift register (9) are the same.

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Klingnau, Switzerland

Klaus Muenzel