Electronic navigation method and system

Details Electronic navigation method and system Electronic navigation method and system

1981-09-17

1984-04-10

Buczinski, S. C.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343395, 343451, 343450, G01S 130, G01S 302

Patent

active

044424329

ABSTRACT:
A method and system for navigation is disclosed comprising a plurality of transmitters, pairs of which are excited from a common frequency source, and a receiver responsive to and deployed within the wave fields created by the transmitters. The receiver is provided with its initial coordinate position and determines movement therefrom by detecting beat frequency cycles resulting from the relative movement between the receiver and the transmitters of a transmitter pair. The receiver position change is computed according to the beat frequency cycles detected. In a preferred embodiment, transmitter pairs are arranged generally perpendicularly to establish a coordinate system and transmitters of a transmitter pair radiate different frequencies that are precisely related to a common excitation frequency source. The receiver detects the transmitted signals, compensates for the precise frequency relationship employed at each transmitter pair, and compares the signals from each transmitter pair to detect beat frequency cycles which are used to compute receiver position change.

REFERENCES:
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patent: 2218907 (1940-10-01), Donnelly et al.
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patent: 2682049 (1954-06-01), Rich
patent: 3206751 (1965-09-01), Knight
patent: 3242492 (1966-03-01), Honore et al.
patent: 3535789 (1970-10-01), Roberts
patent: 3995273 (1976-11-01), Ulstad

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