System for the automatic correction of polarization distortion i

Details System for the automatic correction of polarization distortion i System for the automatic correction of polarization distortion i

1975-09-03

1976-10-12

Griffin, Robert L.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

325 60, 325 65, 325472, 325473, 343200, H04B 702

Patent

active

039861236

ABSTRACT:
A station for the transmission and reception of electromagnetic waves (e.g. from a communication satellite in stationary earth orbit), operating in a multichannel band with two conjugate polarizations, includes a regenerative distortion compensator in a receiving waveguide branch and a predistorter in a transmitting waveguide branch, both controlled by a processor responsive to output signals from a subsequent i-f stage in which a distortion monitor measures cross-talk between the two polarizations on the basis of two central beacons extracted from the incoming message band. The distortion monitor is preceded within the i-f stage by a phase and amplitude stabilizer and is followed by a demodulating stage in which the message signals are distributed to different transmission paths corresponding to the several channels, each transmission path including an individual cancellation-type distortion corrector controlled either by coherent detectors responding to respective channel beacons or by correlators fed with message signals from the two polarizations.

REFERENCES:
patent: 3728644 (1973-04-01), Chu
patent: 3735266 (1973-05-01), Amitay
patent: 3883872 (1975-05-01), Fletcher et al.
patent: 3914764 (1975-10-01), Ohm

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