Optical navigation sensor with single two-dimensional CCD

Details Optical navigation sensor with single two-dimensional CCD Optical navigation sensor with single two-dimensional CCD

1992-08-26

1994-03-29

Barefoot, Galen L.

Aeronautics and astronautics

Spacecraft

With special crew accommodations

2502033, 356152, 356935, 356160, B64G 166, G01S 378

Patent

active

052977625

ABSTRACT:
In an optical navigation sensor used in a navigation system on a spinning spacecraft, a single CCD is positioned on an optical axis of an optical lens system at an image forming plane on which images of stars are formed by the lens system. The exposed surface of the CCD is divided into a first and a second region, the first region for dark images of stars, the second region for a bright image of a candidate planet. The second region of the CCD is implemented with a light shading film with a slit so that the second region is exposed by the bright image but with a light exposure reduced to an adequate level for the CCD. Alternatively, the second region may be provided with a light attenuation filter film. The CCD is driven by a single driver with a charge shift clock signal synchronous with the spinning rate of the spacecraft. The charges induced by the dark and bright images are time delayed and integrated to form an electronic signal of the images.

REFERENCES:
patent: 3723744 (1973-03-01), Lin et al.
patent: 4679753 (1987-07-01), Landecker
patent: 4942291 (1990-07-01), Dietrich
patent: 4952809 (1990-08-01), McEwen
patent: 4999483 (1991-03-01), Okamoto
patent: 5204518 (1993-04-01), Lin et al.
patent: 5229594 (1993-07-01), Vilaire et al.
"Experimental Optical Navigation and Guidance for Muses-A", T. Nishimura et al, 39th Congress of the International Astronautical Federation-Oct. 8-15, 1988.

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