Position fixing system utilizing plural commercial broadcast tra

Details Position fixing system utilizing plural commercial broadcast tra Position fixing system utilizing plural commercial broadcast tra

1976-01-19

1977-10-18

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343112D, 343112TC, 364451, 364458, G01S 514

Patent

active

040548805

ABSTRACT:
A radio navigation, position locating and signaling arrangement employs three operative channels per vehicle for receiving three commercial radio transmissions. Each channel includes feedback circuitry for maintaining a constant phase relationship between a replica of the received broadcast carrier and a reference oscillation, both reduced in frequency. An accumulator in each channel records the number of pulses added and/or deleted from the reference pulse train to provide a measure of the radial distance travelled by a vehicle with respect to the corresponding fixed radio transmitters. Common central station equipment processes the reported vehicle accumulated coordinate pulse counts, and corrects such vehicle coordinate fixing information for frequency error in the non-cooperative commercial transmissions and in the vehicle mounted local reference oscillations.

REFERENCES:
patent: 3747106 (1973-07-01), Dalabakis et al.
patent: 3889264 (1975-06-01), Fletcher

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