Boresight axis discriminator

Claim 1

IN A GUIDANCE SYSTEM RESPONSIVE TO RADIANT ENERGY FROM A TARGET SOURCE, MEANS FOR FOCUSING RAYS OF RADIANT ENERGY FROM THE TARGET SOURCE INTO A FOCAL RING ABOUT A BORESIGHT AXIS OF THE GUIDANCE SYSTEM SO THAT A LATERAL MOVEMENT OF THE TARGET SOURCE WITH RESPECT TO THE BORESIGHT AXIS AND THE DIRECTION OF THE LATERAL MOVEMENT AROUND THE BORESIGHT AXIS WILL BE INDICATED BY A PROPORTIONAL LATERAL MOVEMENT OF THE RING WITH RESPECT TO THE SAME AXIS WHICH IS DIRECTED IN THE SAME DIRECTIONS AS THE TARGET''S LATERAL MOVEMENT, AND MEANS FOR CHOPPING THE RAYS AT THE RING ACCORDING TO A PREDETERMINED PATTERN WHEREBY RAYS PASSING THE CHOPPER FORM A MODULATED BEAM INDICATING TARGET MOVEMENT CHARACTERISTICS NEEDED FOR GUIDANCE, THE FOCAL RING BEING CIRCULAR WHEN THE TARGET IS ON THE BORESIGHT AXIS AND THE CHOPPING MEANS, AS SEEN IN A PLANE PARALLEL TO THE RING FOR AN ON-AXIS TARGET, BEING DIVIDED INTO TWO PARTS BY ONE CONTINUOUS CHOPPING EDGE, THE EDGE HAVING TWO EQUAL PORTIONS DIAMETRICALLY OPPOSING EACH OTHER WITH RESPECT TO THE BORESIGHT AXIS WITH ONE PORTION OF THE EDGE BEING CONVEX AND THE OTHER PORTION BEING CONCAVE, EACH OF THESE PORTIONS CONFORMING IN SHAPE TO THE PERIPHERY OF THE RING WHEN THE RING IS OFFSET BY ITS OWN RADIUS FROM THE BORESIGHT AXIS, WHEREBY THERE IS ONE HUNDRED PERCENT MODULATION OF RAYS FROM THE RING WHEN THE RING IS OFFSET BY ITS OWN RADIUS FROM THE BORESIGHT AXIS.