Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1986-05-23
1988-05-24
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358109, 358107, 358125, 364455, H04N 718
Patent
active
047469765
ABSTRACT:
Stars are sensed by one or more instruments (1, 2) on board a three-axis stabilized satellite, for purposes of assisting in image navigation. A star acquistion computer (64), which may be located on the earth, commands the instrument mirror (33, 32) to slew just outside the limb of the earth or other celestial body around which the satellite is orbiting, to look for stars that have been cataloged in a star map stored within the computer (64). The instrument (1, 2) is commanded to dwell for a period of time equal to a star search window time, plus the maximum time the instrument (1, 2) takes to complete a current scan, plus the maximum time it takes for the mirror (33, 32) to slew to the star. When the satellite is first placed in orbit, and following first stationkeeping and eclipse, a special operation is performed in which the star-seeking instrument (1, 2) FOV is broadened. The elevation dimension can be broadened by performing repetitive star seeks; the azimuth dimension can be broadened by lengthening the commanded dwell times.
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Ekman Donald E.
Kamel Ahmed A.
Savides John
Zwirn Gerald J.
Ford Aerospace & Communications Corporation
Groody James J.
Kostak Victor R.
Radlo Edward J.
Zerschling Keith L.
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