G - Physics – 01 – S
Patent
G - Physics
01
S
343/87
G01S 5/00 (2006.01)
Patent
CA 1117635
LORAN-C NAVIGATION APPARATUS Abstract LORAN-C navigation equipment is disclosed wherein digital circuitry is used to automatically distinguish a master LORAN-C trans- mitting station from a secondary station. The equipment operator manually enters approximate time difference of signal arrival information for a par- ticular 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 acquisition 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 the adjusts the oscillator for a match as indicated on the LED display.
298129
Gowling Lafleur Henderson Llp
Sanders Associates Inc.
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