| 摘要 |
In an electro-optical (E-O) system, the reference axis of a beam of light emitted from a light source is aligned colinear with the boresight image axis and the combined images with their colinear axes spatially fixed are guided to the field of view of an electro-optical sensor which is operative to generate sequentially frames of electrical information in a raster scan format representative of the field of view. The light source of the system is controlled to effect a predetermined time pattern of light beam image intensity variations as sensed by the electro-optical sensor. A position of the sensed light beam image in the generated frame of electrical information is detected in accordance with the predetermined time pattern intensity variation thereof. A positional relationship of the detected image position with respect to the predetermined frame reference position is established for the generated frame information of the electro-optical sensor. The raster scanned field of view is adjusted in the generated frames of electrical information as a function of the established positional relationship to converge the detected position of the sensed light beam image to the predetermined frame reference position, preferably centered within the generated frames of electrical information. Since the light beam axis and boresight axis are spatially fixed colinear by the optical elements of the system, the boresight axis is rendered substantially at the predetermined frame reference position in the generated frames of electrical information.
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