Interference nulling system for antennas

Details Interference nulling system for antennas Interference nulling system for antennas

1987-11-27

1994-03-29

Blum, Theodore M.

Communications: directive radio wave systems and devices (e.g.,

Directive

Including polarized signal communication transmitter or...

455304, H01Q 2106, H01Q 2124, H04B 710

Patent

active

052989089

ABSTRACT:
An interference nulling system is provided which nulls out all types of interference signals received in different lobes of the receiving antenna. The data to be received is transmitted from a high quality circular polarized transmitter antenna having the same polarization as the data receiving port of the receiving antenna. The receiving antenna also has a receiving port whose circular polarization is orthogonal to the antenna port receiving the data so that this latter channel contains only interference signals. The interference signals in this latter channel are correlated with the interference components in the data channel. A control loop is employed to adaptively adjust the phase (or delay) and amplitude of the sample of the interference signal and the adaptively adjusted interference signal is subtracted from the data signal which contains some of the interference signals, thus, providing a clean data signal.

REFERENCES:
patent: 4313220 (1982-01-01), Lo et al.

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