ADAPTIVE ARRAY HAVING AN AUXILIARY CHANNEL NOTCHED PATTERN IN THE STEERED BEAM DIRECTION

An apparatus for cancelling undesired signals affecting an antenna system. The apparatus includes a plurality of adaptive modules. Each module provides sum and difference signals from a pair of antennas in the system. Each difference signal is weighted by an adaptive controller coupled to the difference signal and the apparatus output signal. All sum signals from the modules are sum and all weighted difference signals from modules are summed and the total weighted difference signal is subtracted from the total sum signal to provide an apparatus output. The adaptive controller is a multiplexer associated with each of the difference signals of the modules, a reference receiver receiving a multiplexed information and a correlator coupled to the received information and the apparatus output. The correlator controls the weights affecting each of the difference signals of each module. The output of the subtractor is decoded by a main receiver.