Accession Number : ADD018149

Title :   System and Method for Automatic Ship Steering.

Descriptive Note : Patent, Filed 18 Jul 94, patented 4 Jun 96,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Kriesgman, Jules ; Leblang, Martin E

Report Date : 04 Jun 1996

Pagination or Media Count : 15

Abstract : A real-time ship steering system provides steering of a survey ship along a prescribed thumb line track in accordance with a received point location on the thumb line and a received heading of the rhumb tine. The system of the present invention requires an integrated navigation system, a track-keeping interface, and a ship autopilot to steer a ship. The computer of the navigation system integrates position data from continuous fixed radio and satellite positioning systems, inertial navigation systems, and dead reckon aids to develop the best present position. At prescribed equally spaced times, the best present position is used to compute the off-track distance of the ship. The off-track distance is used to develop proportional and integral heading corrections, which are applied to the autopilot by way of the track-keeping interface. The autopilot accepts the correction signal as a bias to the desired ground track heading, causing the ship to be steered toward the desired track. Heading corrections are apportioned over a number of increments between computations in order to gradually lock the ship onto the track.

Descriptors :   *STEERING, *SHIPS, *PATENTS, POSITION(LOCATION), INTEGRATED SYSTEMS, COMPUTATIONS, REAL TIME, NAVIGATION, SURVEYS, POSITION FINDING, SIGNALS, ARTIFICIAL SATELLITES, INERTIAL NAVIGATION, AUTOMATIC PILOTS, CORRECTIONS

Subject Categories : Marine Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE