Patent
1976-02-20
1977-05-31
Stewart, David L.
179 15BP, 325 60, H04J 1100
Patent
active
040271056
ABSTRACT:
A system for re-establishing the orthogonality of two orthogonally polarized transmitted signals which are each provided with a beacon signal of a different frequency and which are cross-coupled when received. The received signals are fed to a decoupling network, including two controllable members for adjusting the orthogonality of the received signals, which separates the two received signals. The beacon signal components of each of the two received signals are coupled out, and converted to two pairs of beacon signal components with one pair of components including a first component representative of the beacon signal of one beacon signal frequency in a first of the received signals and a second component representative of the other beacon signal frequency in the first received signal (which second beacon signal component constitutes the cross-coupling of the polarization in the first received signal), and with the other pair of components including a third component representative of the beacon signal of the first beacon signal frequency in the other received signal and a fourth component representative of the second beacon signal frequency in the other received signal. The first and fourth beacon signal components are each shifted in phase by 90.degree. and the phase shifted first third beacon signal component in a first phase-sensitive demodulator, while the phase shifted fourth beacon signal component is multiplicatively compared with the second beacon signal component in a second phase-sensitive demodulator. The signals from the demodulators are used to adjust the controllable members of the decoupling network to restore the orthogonality of the two received signals.
REFERENCES:
patent: 3384824 (1968-05-01), Grener
patent: 3391339 (1968-07-01), Lynch
patent: 3443229 (1969-05-01), Becker
Licentia Patent-Verwaltungs G.m.b.H.
Stewart David L.
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