Missile guidance roll reference - is obtained from earth's magnetic field using three detector coils and launcher magnetometer

摘要

The automatic guidance system for a projectile, missile or aircraft obtaining a roll reference from the earths magnetic field. A detector coil, field gradient detector coil and a pitch detector coil are located in the rear of a missile. Pitch signals received from the detector coil (1) are eliminated and a detector determines only the roll signal. A magnetometer on the launcher provides a correction signal determined by the vertical axis and earths field. This data is stored and given a constant phase shift to produce the roll reference signal. A detector connected to an inhibitor prevents this in presence of a non uniform field.