Angular error detecting device.

摘要

All components of arriving polarized waves are obtained independent of the type and amount of polarization. A higher mode detector (2, 3) outputs two higher mode components which are in orthogonal relation. These two components are combined so as to maintain the orthogonal relation. A circuit is provided having a set of at least one 90 DEG phase difference plate (4) and one 180 DEG phase difference plate (5) which have rotatable phase lag surfaces and which are cascade-connected. The 90 DEG phase difference plate (4) is provided on the side of the circuit combining the two higher order components. The output of the 180 DEG phase difference plate (5) is divided into first and second orthogonal polarization components. The first polarization component is synchronously detected with a local oscillator (9) output synchronous with ( DELTA y) reference signals to provide a first angular error output while the output of the second polarization component is synchronously detected with signals shifted 90 DEG in phase from the local oscillator (9) output to thereby provide a second angular error output ( DELTA x) orthogonal to the first angular error output.