Abstract: A device for automatically compensating for dynamic boresight errors between a visual line of sight and the apparent center of a beam of radiation emitted by the device. The radiation emitted by the device is used to guide a "beam-riding" missile to its target. Different sectors of the beam radiated by the device are modulated by different codes so that the missile can sense the apparent center of the beam. Optics within the device sense the extent to which the visual line of sight deviates from the apparent center of the radiated beam by means of measurements upon the coincidence of the visual line of sight and the apparent center of the beam of radiation within the device. The device then alters the coding of the radiated beam so that the apparent center of the radiated beam maintains alignment with the visual line of sight.

Abstract: A guidance system for a beam rider missile, having a novel coded light beam projector at an aiming station, for use by a missile-mounted receiver. The projecting means contains a rotating transparent reticle through which the beam is transmitted, the reticle having an opaque radial portion in a curved "leaf" shape. When the diameter of the projected beam is held constant at the missile distance during flight, the position of the missile in polar coordinate form is given by the relative angular position and duration of the blocked-out portion of the beam received at the missile.