Angular error detecting device

Details Angular error detecting device Angular error detecting device

1981-08-24

1983-10-04

Blum, Theodore M.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343420, H04B 700

Patent

active

044082070

ABSTRACT:
An angular error detecting device in which all components of arriving polarized waves are obtained independent of the type and amount of polarization. A higher mode detector 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.degree. phase difference plate and one 180.degree. phase difference plate which have rotatable phase lag surfaces and which are cascade-connected. The 90.degree. phase difference plate is provided on the side of the circuit combining the two higher order components. The output of the 180.degree. phase difference plate is divided into first and second orthogonal polarization components. The first polarization component is synchronously detected with a local oscillator output synchronous with reference signals to provide a first angular error output while the output of the second polarization component is synchronously detected with signals shifted 90.degree. in phase from the local oscillator output to thereby provide a second angular error output orthogonal to the first angular error output.

REFERENCES:
patent: 3836973 (1974-09-01), Shnitkin et al.
patent: 4106015 (1978-08-01), Beguin et al.
J. S. Cook et al., The Autotrack System, Bell System Technical Journal, Jul. 1963.
L. J. Cooper, A Frequency Reuse, Monopulse Tracking Feed for Cassegrain Antenna Applications, 1980, IEEE Publication No. AP. 3-7.

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