LORAN-C navigation apparatus

Details LORAN-C navigation apparatus LORAN-C navigation apparatus

1976-11-12

1978-08-01

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343105R, G01S 124, G01S 130

Patent

active

041046358

ABSTRACT:
LORAN-C navigation equipment is disclosed wherein digital circuitry is used to automatically distinguish a master LORAN-C transmitting station from a secondary station. The equipment operator manually enters approximate time difference of signal arrival information for a particular secondary station into the equipment after consulting a LORAN-C chart. The operator then manually determines the exact time difference of arrival using thumbwheel switches and a LED lamp display. This procedure is repeated to determine exact time difference of arrival information for the master and each selected secondary station, and the information is plotted in a well-known manner on the LORAN-C chart to locate the position of the craft upon which the equipment is located. Manual acqisition of secondary stations simplifies the equipment and eliminates interference problems caused by skywaves and other transmissions. The set oscillator is easily and quickly calibrated by the operator who manually enters the LORAN-C chain group repetition interval information found on the LORAN-C chart on the thumbwheel switches of the receiver and then adjusts the oscillator for a match as indicated on the LED display.

REFERENCES:
patent: 3573828 (1971-04-01), Hawley
patent: 3736590 (1973-05-01), Lipsey

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