Ab Bofors

Saab Ab

Bofors Ab

Ake Hansen

Berndt Nilsson

A process for determining roll angle of a body launchable from a launcher. At least one inducing field is induced in the launchable body. A polarized carrier wave is transmitted from the launcher to the launchable body. The transmitted polarized carrier wave is detected in the launchable body with respect to rotation of the launchable body. The detected transmitted polarized carrier wave and the inducing field are analyzed to establish the roll angle as the launchable body leaves the launcher.

Process and device for determining roll angle

A system for an unambiguous determining of the roll angle attitude of a rotating projectile, grenade, missile or the like with the aid of a polarized electromagnetic radiation, comprises a transmitter for emitting a position-determining polarized radiation (space wave) in the direction of the projectile and a receiver arranged in the projectile for receiving the emitted radiation. The emitted space wave is made up of a carrier wave reference with frequency f.sub.1 which has been phase-modulated with a modulation frequency f.sub.2, wherein f.sub.2 is&lt;&lt;f.sub.1 and wherein f.sub.2 forms a submultiple of the carrier wave frequency f.sub.1.

Determination of roll angle

An apparatus for determining the roll angle of a rotating projectile, shell, missile or the like as it leaves the barrel or launch tube includes a magnetized part with a known polarization direction provided in the projectile, and two pairs of windings mounted at the very front of the muzzle bell of the barrel in such a way that a voltage is induced in the windings when the projectile passes the mouth, and an evaluation unit is designed to calculate, based on the voltage signals, the roll angle position of the projectile upon firing.

Roll angle determination

An apparatus for determining the roll angle position of a rotating projectile, with the aid of polarized electromagnetic radiation, comprises a transmitter for emitting a position-determining polarized radiation in the direction towards the projectile and a receiver arranged in the projectile for receiving the transmitted radiation. The emitted radiation consists of two components, a first component in the long-wave (LF) band and a second component in the microwave band. The microwave component comprises a pulse train in which the pulses are intended to indicate when the long-wave component is situated in a certain phase position, for example, to indicate the sinusoidal long-wave component's zero cross-overs with a positive-going derivative. This takes place in such a way that a synchronizing pulse is emitted by the long-wave transmitter to the microwave transmitter which transmits a short series of microwave pulses as an indication to the projectile.

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Karlstad, Sweden

Ake Hansen