INTERFERENCE NULLING SYSTEM FOR ANTENNAS

Assignee

UNISYS CORPORATION, A CORP. OF DE.

Filed

Nov 27, 1987

Granted

Mar 29, 1994

Location

SALT LAKE CITY UT US

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.

Source: Google Patents