Digital autopilot controller for marine vessels
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United States of America Patent
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Oct 11, 1988
Grant Date -
N/A
app pub date -
Jun 26, 1986
filing date -
Jun 26, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A heading change unit for a ship's autopilot gyrocompass that provides a heading error signal to produce a proportional rudder control signal. An operator enters a heading change which causes an up/down counter to be incremented or decremented in accordance with the heading change order. The counter is also responsive to a step heading input signal. The count is referenced to a zero value and converted to an analog control signal by a digital-to-analog converter. As the ship turns towards the new heading, the changing step heading input will cause the counter to count back to zero. The displayed amount of heading error or ordered heading change is generated by converting the analog heading error signal to a digital encoded format which controls a display. The heading error signal is generated in the form of a parallel twelve bit binary code which represents integer degree changes and 1/6 degree fractional changes.
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