Loran-C receiver

Details Loran-C receiver Loran-C receiver

1984-05-04

1986-05-27

Blum, Theodore M.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

G01S 124

Patent

active

045918600

ABSTRACT:
In a loran-C radio receiver, tracking of the loran-C signal is initiated by sampling the carrier wave intensity of the loran-C signal at a high frequency over two pulse modulation cycles of the loran-C signal and storing the values recorded in each cycle of the sampling frequency in a corresponding memory cell. The sampled values are stored by adding one to the corresponding memory cell if the sampled signal polarity is positive and subtracting one from the given cell, which is initialized to a known value, when the sample has a negative polarity. This sampling over two loran-C cycles is then repeated numerous times, so that after such repetion, each memory cell, corresponding to a specific phase of the loran-C signal, will either have the known value, indicating no carrier wave peak, or a value significantly greater than the known value, indicating a carrier wave peak and so a loran-C pulse. Coordination between the carrier wave and the sampling process is achieved by a multiple sample pulse with a period matching that of the carrier wave, each pulse of the multiple sample pulse being separate from others by 1/4-or 1/8-of the carrier wave period and the first of the multiple pulses being synchronized with a zero-crossing point of the carrier wave.

REFERENCES:
patent: 3934254 (1976-01-01), Vogeler et al.
patent: 3947849 (1976-04-01), Fehiner
patent: 4166275 (1979-08-01), Michaels et al.
patent: 4224623 (1980-09-01), Mercer et al.
patent: 4268830 (1981-05-01), Brodeur
patent: 4468668 (1984-10-01), Brodeur
O'Halloran et al., "Use of Loran-C in AVM and C.sup.2 Systems," 1980, Carnahan Conference on Crime Countermeasures, University of Kentucky, May 14-16, 1980.

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