Interferometric ship's heading reference system
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United States of America Patent
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Feb 25, 1997
Grant Date -
N/A
app pub date -
Apr 1, 1983
filing date -
Apr 1, 1983
priority date (Note) -
Expired
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Abstract
Two Sagnac interferometers are mounted on board a ship with their axes in a horizontal plane. The axis of one interferometer is aligned in a fore-aft direction whereas the axis of the other interferometer is aligned athwartship. The output signals of the two interferometers are combined mathematically so as to cancel the effects of the ship's latitude and thus provide an output signal independent of this parameter.
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