H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/45
H04B 7/00 (2006.01)
Patent
CA 1069589
ABSTRACT OF THE DISCLOSURE: A device for automatically correcting the depolarizing effect of circularly polarized electromagnetic waves in trans- mission systems of the type employing two distinct receiving and transmitting frequency bands, each of which has a double crossed circular polarization and wherein two "beacon" signals of distinct frequencies are allocated to the receiving band. A separating unit separates the signals of the two bands and a correcting unit corrects the interference effects due to de- polarization of the receiving band signal. A conversion- separation unit transforms the two circular cross-polarizations of the receiving band signals into two linear cross-polarizations according to two orthogonal components (namely D and S) and those of the beacon signals into two linear cross-polarizations according to two orthogonal components (namely B and C). A pair of separating units which separate the components of the beacon signals (B and C) from the components of the receiving band signals (D and S) and two pairs of filters are tuned to the frequencies f1 and f2 of the two beacon signals, the inputs of these filters being connected to the output of the separating units which further separate each of the components B and C into the non-depolarized beacon signals and to the depolarized beacon signals. A processing unit is connected to the outputs of the two pairs of filters, this unit processing the non-depolar- ized and depolarized signals and emitting four output signals each of which controls an adjusting element for adjusting the correcting unit.
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