Radio navigation system

Details Radio navigation system Radio navigation system

1982-04-20

1984-12-25

Blum, Theodore M.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

G01S 136

Patent

active

044907222

ABSTRACT:
An improved line-of-position radio navigation system is disclosed wherein a continuous wave signal produced by a local oscillator is transmitted from a fixed station. At a remote mobile station, the signal is received and is heterodyned with the output of a local oscillator at the mobile station to produce a signal having an audio frequency. The output of the mobile station's local oscillator also is synthesized to produce an audio frequency signal which is phase-compared with the audio heterodyne signal by a phase meter to generate line-of-position information. To adjust for any drift in the local oscillators, a transmitter at the mobile station is periodically activated for a brief interval to cause heterodyning at the fixed station. The resultant signal is employed to transmit a modulated signal from the fixed station which is processed at the mobile station to perform a phase adjustment to compensate for oscillator drift.

REFERENCES:
patent: 2709253 (1955-05-01), Haywood et al.
patent: 2779018 (1957-01-01), Gregoire et al.
patent: 2838753 (1958-06-01), O'Brien et al.
patent: 3241139 (1966-03-01), Wajley
patent: 3325811 (1967-06-01), Earp
patent: 3333265 (1967-07-01), Rounion
patent: 3613095 (1971-10-01), Elwood
patent: 3787844 (1974-01-01), Hastings et al.
patent: 4308620 (1981-12-01), Grousseau

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