A digital receiver/exciter (DREX) antenna calibration system includes a DREX antenna array, and an antenna probe configured to receive energy from the DREX antenna array and/or transmit energy to the DREX antenna array. A modular signal processing unit is in signal communication with the DREX antenna array. The modular signal processing unit includes a plurality of individual signal processing programmable integrated circuits configured to process the energy. A modular array controller is in signal communication with the probe controller, the DREX antenna array, and the modular signal processing unit. The modular array controller includes at least one modular array unit that includes an array programmable integrated circuit and a multicore processor.