| 摘要 |
<p>A reticle (R) for a guidance seeker for spinning projectiles (18) comprises a substrate; a pattern of a plurality of alternating light modulating structures, such as opaque (2) and light transmitting (4), or light absorbing and light reflecting areas on the substrate such that an image (32) of a target (34) moving on the substrate will generate a plurality of pulses (38) corresponding to the number of lines crossed by the image, the number of pulses increasing as the image (32) moves outwardly from the center of the reticle (R); and a distinguishable, unambigous, and singly periodic feature of the pattern, which is readily detectable every time the target image (32) moves circumferentially, completing a full circle around the center of the reticle (R).</p> |
