System for maintaining phase coincidence between a carrier wave

Details System for maintaining phase coincidence between a carrier wave System for maintaining phase coincidence between a carrier wave

1977-10-26

1981-12-29

Orsino, Jr., Joseph A.

Telecommunications

Transmitter and receiver at same station

With frequency stabilization

343102, 455119, 455126, H04B 104

Patent

active

043086209

ABSTRACT:
To maintain a cophasal relationship between two concurrently transmitted waves of the same high frequency derived from a common pilot oscillator, one of these waves being modulated by a low-frequency signal, a phase shifter in cascade with the modulator is controlled by a phase discriminator including a comparator with inputs receiving the two high-frequency waves. An analog multiplier driven by the low-frequency modulating signal converts an error signal from the phase comparator into a unipolar pulsating voltage which, upon integration, yields a control voltage adjusting the phase shifter to correct any relative phase displacement.

REFERENCES:
patent: 3117319 (1964-01-01), Stover
patent: 3938155 (1976-02-01), Mears et al.
patent: 3984778 (1976-10-01), Bhopale

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