LF/MF navigation system

Details LF/MF navigation system LF/MF navigation system

1976-09-13

1978-02-07

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

G01S 130

Patent

active

040729508

ABSTRACT:
A navigation aid comprises two transmitters transmitting signals in the LF/MF range (250 kilohertz-490 kilohertz) and a receiver indicator for receiving each of the transmitted signals, translating them to a common frequency, and indicating the phase difference at any given position. Frequency stablizing means are coupled to each transmitter to stabilize the frequency of each transmitted signal and to prevent the differential frequency error from exceeding a selected limit.

REFERENCES:
patent: 3883874 (1975-05-01), Swanson
patent: 3889264 (1975-06-01), Fletcher
patent: 3928852 (1975-12-01), Barker
H.O. Publication No. 220, U.S. Navy Hydrographic Office, 1963, p. 175.

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