Method and apparatus for self-calibration of a loran-c receiver

Details Method and apparatus for self-calibration of a loran-c receiver Method and apparatus for self-calibration of a loran-c receiver

G - Physics

01

S

343/1

G01S 1/04 (2006.01) G01S 7/40 (2006.01)

Patent

CA 1138557

Abstract A method and apparatus for self-calilbration of a LORAN-C navigation receiver utilizing a microprocessor is disclosed, wherein the time difference of signal arrival of master station pulse trains from a LORAN-C chain selected by group repetition interval (GRI) information input to the receiver becomes a frequency standard to which the output of an oscillator and counter internal to the receiver is compared to determine frequency error. The error is interpolated over each GRI and a correction factor is added or subtracted to each count output of the counter used to make time difference of signal arrival measurements.

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