Rediscovering monopulse radar with digital sum-difference beamforming

Classically, radar signals received from the monopulse quadrants are processed analogically to obtain sum (Σ) and difference (Δ) patterns. Exact Σ/Δ patterns are obtained only at the particular frequency in which the monopulse comparator is designed. In this paper, Σ/Δ patterns are computed via direct digizitazion of the signal coming from the quadrants, paving the way to the development of novel signal processing algorithms. Performance and limitations of digital monopulse processing will be discussed.