Abstract:

Distributed sub-array radar has been widely used in the integrated weapon platform. In order to solve the problem of target angle ambiguity caused by the main beam of long baseline distributed sub-array radar, an adaptive and differential beam spatial selective filtering method is proposed. In this method, the spatial filter is constructed by the sum and difference signals of the separated single array to optimize the receiving pattern. On the premise of effectively suppressing the gate lobe, the robustness of the main lobe power and the beam width of the receiving beam are guaranteed, the angle fuzzy suppression is realized, and the accurate estimation of the target angle is guaranteed. The results show that the proposed method can effectively suppress the grating lobe and ensure the accuracy of parameter estimation in tracking, thus improving the continuity and stability of the distributed array radar in target tracking.

Key words: fire-control radar, distributed sub-array antenna, grating lobe restrain, angle disambiguation, spatial selection filter, direction of arrival estimation, target tracking, pattern optimization