Optical communications – Optical communication over freee space – Satellite system
Reexamination Certificate
2011-04-12
2011-04-12
Phan, Hanh (Department: 2613)
Optical communications
Optical communication over freee space
Satellite system
C398S118000, C398S121000, C398S124000, C398S128000, C398S130000, C455S012100, C455S003020, C455S427000, C455S452100
Reexamination Certificate
active
07925167
ABSTRACT:
A satellite or spacecraft in low Earth orbit, when in eclipse and not illuminated by sunlight, represents a low-bandwidth datastream through modulation of a source of uncollimated light, such as a set of light emitting diodes. Transmission modes include generating patterns in the color, intensity or polarization of a light source, or precise timing control of a strobe signal. A ground station tracks the satellite in a telescope, stewing the telescope to follow the satellite as it moves across the sky, recording light generated by the satellite with a light sensor such as a video camera. The datastream is regenerated through analysis of recorded video. Satellite downlink is initiated by detection of eclipse, by command via radio uplink, or in response to a periodic automatic timer. In an alternative embodiment, the satellite represents the datastream through modulation of its effective albedo or reflective flux during periods of solar illumination.
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Kozubal Marek J.
Sullivan Terence Sean
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