Method and apparatus for removing noise in a LORAN-C navigation

Details Method and apparatus for removing noise in a LORAN-C navigation Method and apparatus for removing noise in a LORAN-C navigation

1979-04-09

1982-04-13

Blum, Theodore M.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

G01S 124

Patent

active

043250670

ABSTRACT:
Noise generated in the front end of a LORAN-C receiver that causes noise bias interfering with carrier cycle detection is effectively removed by periodically shifting the phase of all received signals of 180.degree. in the front end of the receiver and then removing any phase shift elsewhere in the receiver where noise is no longer a problem but before the phase shift can affect time difference of signal arrival measurements normally made in LORAN-C receivers. In this manner, noise generated in the front end of the receiver is averaged out and doesn't introduce bias levels to the received signal.

REFERENCES:
patent: 3870999 (1975-03-01), Mathews et al.

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