The range of selectable algorithms and computer architectures that can process data from digitized array antennas in radar applications is discussed. The requirements on computer capacity are large due to very large volumes of data produced per time unit. The development status for high performance computer architectures is described. Performance measures for parallel computer systems are presented, as are examples of signal processing algorithms and commercial computer architectures. The requirements to do high performance signal processing methods are identified and tracked. The report is based on studies of literature. The needs for research are identified.