Loran-C signal receiving apparatus

Details Loran-C signal receiving apparatus Loran-C signal receiving apparatus

1986-08-08

1989-02-14

Blum, Theodore M.

Communications: directive radio wave systems and devices (e.g.,

Directive

Beacon or receiver

342390, G01S 124

Patent

active

048049646

ABSTRACT:
A Loran-C signal receiving apparatus which achieves accurate measurement of the location of the apparatus without error due to a well-known cycle slip phenomenon. In the Loran-C signal receiving apparatus, a pulse tracking a particular cycle of a carrier wave of the received Loran-C signal is generated, a frequency at which the tracking pulse is generated by a pulse generator (in a PLL circuitry) is monitored and when a frequency error of the generator is derived on the basis of a tracking error of the tracking pulse with respect to the received Loran-C signal, the frequency of the pulse generator is corrected on the basis of the derived frequency error. The apparatus can thus assure a phase tracking of the received Loran-C signal and assure accurate measurement of the location.

REFERENCES:
patent: 3706092 (1972-12-01), Cox, Jr. et al.
patent: 4224623 (1980-09-01), Mercer et al.
patent: 4255740 (1981-03-01), Ferrie
patent: 4595886 (1986-06-01), Mroch et al.
patent: 4595927 (1986-06-01), Menick
patent: 4601061 (1986-07-01), Carney et al.

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