Self calibration of a LORAN-C navigation receiver

Details Self calibration of a LORAN-C navigation receiver Self calibration of a LORAN-C navigation receiver

1981-09-08

1983-05-24

Blum, Theodore M.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

364452, G01S 124

Patent

active

RE0312541

ABSTRACT:
A method for self calibration 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] time counts from the counter used to make time difference of signal arrival measurements are modified in accordance with the determined frequency error to achieve accurate time difference of signal arrival measurements.

REFERENCES:
patent: 3153237 (1964-10-01), Lakatos
patent: 3941984 (1976-03-01), Chappell et al.

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