Optical tracking system

Details Optical tracking system Optical tracking system

1992-01-15

1993-06-01

Hannaher, Constantine

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

2502031, G01S 1766

Patent

active

052162362

ABSTRACT:
An optical system for tracking a target scans an optical beam across the target in a Lissajous pattern. The pattern has at least one portion that extends across the target. Return signals reflected from the target are used to calculate the range (and, if desired, also the intensity) of each measured point on the target (and beyond the target if some portions of the pattern miss the target), and to calculate the deviation of a reference location on the pattern, e.g. its center, from a selected location of the target. This deviation is used to correct the scan to move the reference location on the pattern towards the selected location on the target, thus tracking the target. The amplitude of the pattern can be changed to adjust the pattern on the target or to search for a target. By virtue of the range data obtainable for points on the target and on edges of the target, the system can also determine other features, such as the shape, profile, identity and attitude of the target.

REFERENCES:
patent: 3513318 (1970-05-01), Birnbaum et al.
patent: 3569719 (1971-03-01), Dryden

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