Single sideband quadricorrelator

Details Single sideband quadricorrelator Single sideband quadricorrelator

1982-07-26

1984-09-04

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

329 50, 329124, 375 77, 375 87, H03D 124

Patent

active

044701454

ABSTRACT:
A supplementary frequency acquisition circuit in the form of a frequency difference detector called a single sideband quadricorrelator is provided. When used in conjunction with a phase-locked loop of a conventional spread spectrum demodulator, this circuit allows for the rapid acquisition and accurate tracking of the center frequency of a spread spectrum suppressed-carrier bi-phase PSK signal. The invention cancels spurious sum and difference frequency components impulsed at the data rate as well as double difference frequency component and other modulation products without filtering. By eliminating the need for supplementary low pass filtering, the present invention provides rapid acquisition of the suppressed-carrier signal and provides a frequency difference output at twice the amplitude of comparable prior art systems. The tracking error or frequency difference (.omega..sub.i -.omega..sub.o) is obtained by differentiating the quadrature signal and multiplying by the in-phase signal component rotated 180.degree. in phase. This product is summed with the output obtained by multiplying the differentiated in-phase signal component with the quadrature signal component.

REFERENCES:
patent: 3568067 (1971-03-01), Williford
patent: 3611144 (1971-10-01), Harmon, Jr. et al.
patent: 3634773 (1972-01-01), Kobayashi et al.
patent: 3675131 (1972-07-01), Pickholtz

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