Communications: directive radio wave systems and devices (e.g. – Directive – Beacon or receiver
Patent
1985-05-09
1988-09-27
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Beacon or receiver
364452, G01S 124
Patent
active
047745185
ABSTRACT:
An apparatus receives Loran-C pulses and tracks the phase of each received Loran-C pulse received from master and secondary stations. The apparatus comprises: (a) a phase comparator (12) for comparing the phase of the Loran-C pulse received from each transmitting station with that of a comparison signal; (b) a phase locked loop circuitry (16) for generating the comparison signal at a given integral multiple of the repetition rate of the Loran-C signal; (c) an S/N ratio detection circuit (14) for measuring the signal-to-noise ratio of the received signal; (d) a loop filter (13) for correcting the timing at which the comparison signal is generated toward coincidence with the phase of the received Loran-C pulse when a given number of phase comparisons by the phase comparator (12) produce results of the same polarity; and (e) a sample number control circuit (15) for adjusting at least one of the given integral multiple and the given number according to the measured signal-to-noise ratio. The phase tracking can thus be achieved with high accuracy even at low signal-to-noise ratios and with far higher accuracy at higher signal-to-noise ratios.
REFERENCES:
patent: 3868690 (1975-02-01), Miller
patent: 3868691 (1975-02-01), Miller et al.
patent: 3921076 (1975-11-01), Currie
Automatic Airborne Loran-C Navigator And The Results Of Its Evaluation Test Sane 81-34.
Blum Theodore M.
Gregory Bernarr Earl
Nissan Motor Company Limited
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