1. A data processing system for an electronically scanned, phased array antenna radar system, comprising; a. an electronically scanned, phased array antenna comprising an array of n radiating and receiving elements, and a phase control circuit for each element, wherein the phase front of the antenna beam is controlled to steer the antenna beam by individually controlling the gain and phase excitation of each radiating element; b. a signal receiver, including an interference suppressor processor, for processing signals received by said phased array antenna, wherein the receiver controls the gain and phase shift of the signals received by the elements to match the transmitted beam pattern, and wherein interference suppression is achieved by generating nulls in the received antenna pattern in the direction in which the interference is to be suppressed by adjusting the elements, and wherein the signal processing requirements are reduced by, means for summing the outputs of the phase control circuits for adjacent array elements to produce a number of summed signals less than the number of elements in the array, and each summed signal being directed to a weighted amplifier controlled by said interference suppressor processor to weight the contribution of that particular summed signal to a composite output signal formed by a composite summing means for summing the weighted output signals of the weighted amplifiers.