Loran-c navigation apparatus

Details Loran-c navigation apparatus Loran-c navigation apparatus

G - Physics

01

S

343/87

G01S 5/06 (2006.01) G01S 1/24 (2006.01) G01S 5/10 (2006.01)

Patent

CA 1124820

LORAN-C NAVIGATION APPARATUS Abstract of the Disclosure LORAN-C navigation apparatus is disclosed wherein digital circuitry and a microprocessor is used to automatically identify LORAN transmitting stations and makes standard hyberbolic navigation measurements. The equip- ment operator manually enters the group repetition rate into the apparatus for a LORAN-C chain covering the area within which the navigation apparatus is being operated. Initially, the apparatus searches all incoming signals until signals from a master station are received regularly at the stored group repetition rate. The apparatus then closely determines the time of arrival of signals from the secondary stations of the selected LORAN-C chain before changing to a fine search mode in which the exact time of arrival of the 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 defective secondary station blink code. The time difference of arrival measurements are then output visually to be plotted in a well known manner on a LORAN-C chart to locate the posi- tion of the craft upon which the apparatus is located.

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