Accession Number : AD0693098

Title :   ANTENNA AND STABILIZATION CONSOLE FOR A VLF RELATIVE NAVIGATIONAL SYSTEM.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF

Personal Author(s) : Roeder,Bernard Franklin , Jr

Report Date : APR 1969

Pagination or Media Count : 69

Abstract : A VLF relative navigational system makes use of the fact that, at any given point on the earth, phase delay of a received VLF signal is highly stable and predictable. As the receiver is physically moved, phase delay changes linearly with distance from the transmitting station, so that by keeping track of the phase delay of the received signal from several VLF stations, an accurate plot of geographical position is maintained. The paper outlines the development of a relatively simple antenna system, composed of two crossed loops and a whip sense antenna to produce a cardiod shaped radiation pattern, which effectively discriminates against the long-way-around-the world contamination on the short path signal. A means is also devised for electronically rotating the fixed antenna by means of a goniometer which may be stabilized in azimuth by an input from a ship's gyrocompass. (Author)

Descriptors :   (*RADIO NAVIGATION, VERY LOW FREQUENCY), (*SHIP ANTENNAS, *POSITION FINDING), LOOP ANTENNAS, STABILIZATION SYSTEMS, PHASE, GONIOMETERS, AZIMUTH, LINEAR SYSTEMS, THESES

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE