Digital beamforming (DBF) is a powerful method to enhance the antenna performance. In DBF the received signal from each array element is processed individually. These systems are less complex since beamforming is not carried out using analog phase shifters. Signals are simultaneously processed in the digital domain to generate a multitude of beams essential for a variety of applications like fast adaptive interference rejection, ultra-low side-lobes, high resolution direction finding, etc. DBF is most advantageous in its receive mode [1]. The features provided by DBF in this mode include: improved adaptive pattern nulling; closely-spaced multiple beams; array element pattern correction; antenna self-calibration and ultra-low side-lobes; super-resolution; and flexible radar power and time management.
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