@ A laser guidance beam (30) for beam-riding aerial missiles is reflected at a stabilised mirror (M) to stabilise its
position in space. A target (T) is viewed by an operator in a field of view (22) which also contains an aiming mark (A) stabilised by the mirror (M). A joystick (27) is used to generate signals for rotating the mirror (M) to bring the stabilised aiming mark (A) into superposition with the target, whereby the guidance beam (30) is also superposed on the target.
Separate mirrors can be used for stabilisation in pitch and yaw (Figure 8). Different mirror elements on a single mirror unit, with the elements separated by a baffle, can be used to eliminate the risk of laser radiation of the guidance beam from entering the eye of the operator.