Apparatus for determining the roll angle position of a flying device, especially of an ammunition

摘要

The device uses a directional antenna (23) mounted on the shell body. The shell rotates in flight around its axis (21) and when the transmitter antenna points towards a GPS ground receiver (29) and antenna (28) there is a peak in received signals. The peak determines the shell angle of rotation at that instant allowing course correction signals to be calculated (27) relative to the shell missile body angle. The correction instruction (33) is transmitted from a ground GPS transmitter and received by an omni-directional antenna on the missile.