Co-channel interference suppression apparatus

Details Co-channel interference suppression apparatus Co-channel interference suppression apparatus

1974-04-15

1978-02-21

Griffin, Robert L.

325476, H04B 110

Patent

active

040755665

ABSTRACT:
The present invention refers to apparatus intended to suppress multiple co-channel interference and reflections from desired stations. The outputs of a two antenna array, which has been directed at the desired station, are fed to a sum-and-difference hybrid. The outputs of the hybrid are adjusted in amplitude and phase and combined to null the interference signal. The phase shift required for nulling is either .+-.90.degree.. The sign is determined by the side of the array on which the interference source is located. The phase relation is true regardless of the exact location of the interference, requiring only a single adjustment in amplitude to null the source of interference.
By adding a third antenna to the array and a phase detector to the system, a signal representing the direction of the source of interference is produced and is used to introduce either a .+-.90.degree. phase shift and to set the required attenuation automatically cancelling the interference signal even if the interference signal source moves as effectively occurs with the resultant of multiple sources of interference.

REFERENCES:
patent: 2854568 (1958-09-01), Lewin et al.
patent: 3167761 (1965-01-01), LeParquier
patent: 3354459 (1967-11-01), Schwartz et al.

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