| 摘要 |
Systems and methods for positioning a camera target relative to a signal acquisition frame. Detection of the target's position deviation may be achieved by a calibration beam being reflected from the target surface and being detected by at least two position sensitive detectors (PSDs) to thereby allow removal of ambiguity in the target's Z-focus error from its tilt error. The PSD-measured quantities can be transformed into target control space quantities that can be used in a control loop to reduce the target position error. The calibration beam and one or more of the PSDs can also be used to detect the target's edges, thereby allowing lateral centering of the target relative to the reference frame.
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