Using a rotating quarter-wave phase plate in polarization-modulation methods for determining the roll and bearing angles of an aircraft

A polarization-modulation method for simultaneous determination of the navigation parameters of the bearing and roll of an aircraft from orthogonally linearly polarized beacon signals is studied. Signals are emitted simultaneously from two spatially separated points in the horizontal plane with known coordinates. On Board the aircraft, the resulting vector signals are received by the onboard receiving antenna, in the path of which a polarizing modulator is installed. A rotating section of a circular waveguide with a quarter-wave phase plate embedded inside is used as a polarizing modulator. The bearing and roll of the aircraft are estimated at the output of a single-channel receiver, respectively, by the amplitudes and phases of the second and fourth harmonics of the polarization modulation frequency contained in the envelope spectrum of the received resulting vector signals.

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