Loran-C navigation apparatus

Details Loran-C navigation apparatus Loran-C navigation apparatus

1978-08-28

1981-11-10

Tubbesing, T. H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

364452, G01S 510

Patent

active

043001394

ABSTRACT:
A Loran-C navigation receiver is disclosed wherein digital circuitry and a microprocessor is used to automatically identify Loran transmitting stations and makes standard hyberbolic navigation measurements. The receiver operator manually enters a group repetition rate into the apparatus being operated. Initially, the receiver receives and analyzes all received signals until signals from a master and secondary station are received regularly at the stored group repetition rate. The apparatus then changes to a fine search mode in which the exact time of receipt of the master and secondary station signals is determined; the phase code of the received signals is checked to determine if the received signal is a ground or sky wave, and a determination is made if there is a deflective secondary station blink code. The time difference of arrival measurements are then made and an output provided to be plotted in a well-known manner on a Loran-C chart to locate the position of the craft upon which the receiver is located.

REFERENCES:
patent: 3921076 (1975-11-01), Currie
patent: 4104635 (1978-08-01), Brodeur
patent: 4166275 (1979-08-01), Michaels et al.

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