Method and system for measuring the speed of a ship

Details Method and system for measuring the speed of a ship Method and system for measuring the speed of a ship

1983-08-29

1985-06-25

Woodiel, Donald O.

Measuring and testing

Navigation

Ship's log

G01C 2110

Patent

active

045246157

ABSTRACT:
A single scope method or system for accurate ship speed measurement relative to the water through which it is propelled. There is a free floating buoy beside the ship, and a tracking scope is trained on the buoy. At the same time the height above the water of the scope is measured in addition to the negative elevation and the azimuth angle of the line of sight of the scope relative to the ship. Periodic calculations with time measurements determines the speed of relative movement of the buoy along a path parallel to the center line of the ship. This is the ships speed relative to the water. Calculations may be made by a microprocessor with the measured angles and height above the water as inputs.

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