Optical tracking device using interlaced images

Details Optical tracking device using interlaced images Optical tracking device using interlaced images

1980-01-15

1982-05-18

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

G01J 120

Patent

active

043307051

ABSTRACT:
A stellar tracking device for providing increased interpolation accuracy for locating the centroid of a stellar image on a charge transfer device (CTD) array. A beam splitter splits the beam from a star being tracked into two separate and distinct beams which are focused by a lens as separate images on the surface of the CTD array. The beam splitter and lens are configured so that the two beams are spatially phase shifted (interlaced) in each axis of the array by one half of a cycle of the transfer function of a group of pixels made up of individual CTD elements. By combining the signals derived from separate subsets of pixels associated with the two separate images, a more linear transfer function for interpolation of the centroid of the beam is achieved than can be obtained by using only a single image.

REFERENCES:
CCD Star Trackers by W. C. Goss-Jet Propulsion Lab., Pasadena, Calif.
Design, Fabrication, and Delivery of a Charge Injection Device as a Stellar Tracking Device by Burke, et al.-NASA.

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