Adaptive polarization receiving system
AssigneeThe United States of America as represented by the Secretary of the Army
InventorGottfried F. Vogt
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Abstract
The described signal receiving system includes control apparatus for making system phase angle track the orientation angle of linear polarization of a radiated carrier, and for keeping substantially small any phase and amplitude distortions of the carrier which result from undesired polarization modulation.
Claims3
In a radio communication system of the type including a signal receiver, a pair of quadrature positioned cross dipole antennas for recovering intelligence information for reporduction by said receiver, and means for producing signal components of the angle of polarization of an incident wave of high frequency energy received thereby, the combination therewith of:
- first polarization follower apparatus for providing a first, variable control signal that comprises a variable direct voltage superimposed onto an alternating signal to maintain the system phase angle in synchronization with the incident polarization angle of said high frequency wave;
- and
- second polarization follower apparatus for providing a second variable control signal that comprises substantially only a variable direct voltage 90.degree. displaced in phase with respect to said first control signal to decrease the sensitivity of said receiver to distortion in intelligence information due to undesired polarization modulation caused by perturbations in the propagation medium.
Dependencies are inferred from the claim text.