Automatic Loran-C signal detecting apparatus

Details Automatic Loran-C signal detecting apparatus Automatic Loran-C signal detecting apparatus

1984-04-18

1987-06-02

Blum, Theodore M.

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

Directive

Beacon or receiver

364452, G01S 124, G01C 2100

Patent

active

046707590

ABSTRACT:
An automatic Loran-C signal detecting apparatus samples a received signal at a constant high sampling frequency of which the Loran-C carrier frequency is a harmonic. The polarity of the sampled signal at each sampling frequency cycle is stored in a corresponding memory cell for every two successive periods of the Loran-C signal. All of memory cells are previously loaded with a value m. A control unit determines whether the polarity of the sampled signal is positive or negative and adds +1 to the value m of the memory cell when the sampled signal is positive and adds -1 to the value m of the memory cell when the sampled signal is non-positive. After a given number of Loran-C signal cycles, the accumulated polarity totals are compared to a range around the original value m to detect which memory cells, i.e. which sampling times, coincide with Loran-C pulses. The polarity of the Loran-C pulses thus detected can then be checked to identify the sending station of each group of Loran-C pulses.

REFERENCES:
patent: 4166275 (1979-08-01), Michaels et al.
patent: 4268830 (1981-05-01), 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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