Abstract:The distributed array radar consists of several distributed small aperture sub-arrays processed coherently, which can expand the antenna aperture, improve the angular measurement accuracy and resolution, and enhance the detection ability, which can also provide higher degrees of freedom for large physical aperture array designation. A shipboard distributed digital array radar system combining with P~L ultra wide band antenna and the advantages of digital array is demonstrated. The new radar adopts the distributed array system and digital array signal processing technology, can effectively increase the antenna aperture size and information acquisition capability, improve the detection performance. It adopts a hull conformal antenna design, realizes the hull and electromagnetic stealth, improve platform surface integration ability. The proposed radar system can reconstruct aperture and optimize array according to different ship platform structures, and has the advantages of multi-function, multi-mode and universality.