The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 11, 2020
Filed:
Feb. 04, 2013
Nippon Yusen Kabushiki Kaisha, Tokyo, JP;
NIPPON YUSEN KABUSHIKI KAISHA, Chiyoda-ku, Tokyo, JP;
Abstract
A ship's speed meter for measuring a speed relative to the water of a ship, the ship's speed meter including a wave transmitterfor emitting a sound wave toward a sea bottom, a wave receiverfor detecting a plurality of reflected waves, which are reflected waves of the sound wave having been emitted from the wave transmitter, reflected by a plurality of reflecting objectspositioned at different water depths, and an arithmetic processing unitfor calculating a ship's speed relative to the water of the shipbased on a frequency difference of the sound wave and the reflected wave. The arithmetic processing unitobtains a change rate of a current velocity in a water depth direction by obtaining current velocities at a plurality of different water depths based on a frequency difference between the sound wave and the plurality of reflected waves, and calculates a current velocity at a water depth at which the change rate is smaller than or equal to a threshold value as the ship's speed relative to the water of the ship