초록 ▼

This invention is concerned with an indicator apparatus for determination of the trajectory or the trajectory direction of a projectile travelling at supersonic speed. It comprises pressure sensitive transducers (T1-T4), which have fixed positions relative to each other or move relative to each othe

This invention is concerned with an indicator apparatus for determination of the trajectory or the trajectory direction of a projectile travelling at supersonic speed. It comprises pressure sensitive transducers (T1-T4), which have fixed positions relative to each other or move relative to each other in a defined way, and which are devised to measure the pressure wave generated by the projectile. Also, there are means to produce electrical signals from the transducers, which represent the pressure values sensed by the transducers. Using said signals from each pressure transducer the computing circuits determine a value for a time instance when the pressure wave pass the transducer. From these time values and the geometrical quantities, which specify the position of each transducer in relation to a spatial coordinate system, the computing circuits evaluate the direction of the projectile trajectory more or less accurately. In this way the location of the projectile launching point is also more or less accurately determined. In a preferred implementation the computing circuits are designed to use values from four pressure transducers with known movement and the pressure wave from at least two and preferably three projectiles following each other with approximately the same trajectory direction. Alternatively, the computing circuits are designed to use values from at least eight or, for very high accuracy, twelve pressure transducers assembled in clustered groups of four transducers each, and the pressure wave from at least one projectile.

대표청구항 ▼

A device for the determination of the direction of movement of a projectile having approximately supersonic speed comprising at least four pressure transducers which are fixedly arranged in relation to each other or which are adapted to move with constant velocities in relation to each other and in

A device for the determination of the direction of movement of a projectile having approximately supersonic speed comprising at least four pressure transducers which are fixedly arranged in relation to each other or which are adapted to move with constant velocities in relation to each other and in relation to a fixed reference frame for the atmosphere in a predetermined way, such that, at each time instance at least four of said pressure transducers are not located in the same geometrical plane, and the pressure transducers are arranged to sense the time instance at which the pressure or bow wave generated by the said projectile hits them; calculating circuits for receiving electric signals representative of the hit time instances, wherein the calculating circuits are arranged to determine, using only the electric signals representative of the hit time instances, geometrical data indicating the position and movement of the pressure transducers in relation to said fixed reference frame or the atmosphere, and if required a value of the speed of sound as inputs, the direction of movement in three dimensions of the projectile and from this direction also to determine the location, from which the projectile was issued.