Accession Number : AD0742320

Title :   Follow-the-Wire Marine Aid to Navigation System: Report on an Initial Demonstration Installation.

Descriptive Note : Final rept.,

Corporate Author : COAST GUARD WASHINGTON D C

Personal Author(s) : McIntosh,James A.

Report Date : MAY 1972

Pagination or Media Count : 40

Abstract : A need exists for a short range, high accuracy marine navigation system for use in ice-covered rivers and channels. One potential solution consists of an energized cable laid on a channel bottom precisely on the desired trackline, and sensing coils and display equipment mounted on the ship to determine and indicate the direction of the cable from the ship. In particular, voltages induced in the sensing coils by the cable's magnetic field are used to generate (by the Lissajous technique) a narrow ellipse on the face of a cathode ray tube. The tilt angle of the major axis of this ellipse is indicative of the cable location with respect to the ship. (Author)

Descriptors :   (*ELECTRIC CABLES, POSITION FINDING), (*COAST GUARD RESEARCH, *NAVIGATIONAL AIDS), UNDERWATER OBJECT LOCATORS, DETECTORS, MAGNETIC FIELDS, CATHODE RAY TUBES, DIRECTION FINDING, RELIABILITY(ELECTRONICS)

Subject Categories : Electrooptical and Optoelectronic Devices

Distribution Statement : APPROVED FOR PUBLIC RELEASE