Digital sidelobe canceller with real weights

A real-weight digital open-loop coherent sidelobe canceller for a radar system having a main radar receiver and at least one auxiliary radar receiver comprising:

• a first memory having first and second inputs for receiving signals representing a sequence of n pairs of digital sample values, I.sub.mk and Q.sub.mk, the sample values I.sub.mk and Q.sub.mk representing, respectively, the digitized in-phase components and quadrature phase components of the output of the main radar receiver;
• a second memory having third and fourth inputs for receiving signals representing a sequence of n pairs of digital sample values I.sub.1k and Q.sub.1k, the sample values I.sub.1k and Q.sub.1k representing, respectively, the digitized in-phase components and quadrature phase components of the output of said auxiliary radar receiver;
• computing means connected to said first and second memories for forming signals representing the weighting coefficients W.sub.1, W.sub.2, V.sub.1 and V.sub.2 ;
• a first multiplier means connected to said computing means and to said second memory for forming signals representing the products W.sub.1 I.sub.1k ;
• a second multiplier means connected to said computing means and to said second memory for forming signals representing the products W.sub.2 Q.sub.1k ;
• a third multiplier means connected to said computing means and to said second memory for forming signals representing the products V.sub.1 I.sub.1k ;
• a fourth multiplier means connected to said computing means and to said second memory for forming signals the representing the products V.sub.2 Q.sub.1k ;
• and
• output means connected to said first memory and to said first, second, third and fourth multiplier means for forming a first signal set, I.sub.mk -[W.sub.1 I.sub.1k +W.sub.2 Q.sub.1k ], and a second signal set Q.sub.mk -[V.sub.1 I.sub.1k +V.sub.2 Q.sub.1k ] said first and second signal sets representing, respectively, sidelobe cancelled in-phase channel signals and sidelobe cancelled quadrature phase signals.