Mitigation of Spurious Interferences from Co-site Large Phased Arrays Using Sidelobe Cancellation Techniques

Interference due to spurious signals emitted by large phased arrays of radar and electronic warfare systems is a widely concerned issue. Currently, we mainly rely on passive isolation means such as advanced planning of the locations of the antenna arrays and/or spectrum allocations. Although these methods are effective, they are inflexible due to the limited space of the platforms or spectrum. In addition, the spatial and spectral isolations predicted in advance is never precise, and overestimation may result in serious problems after implementation. In this paper, we propose to apply sidelobe cancellation (SLC) techniques to actively suppress spurious interferences from co-site large antenna arrays. Mathematical models and simulation results are presented, which demonstrate the effectiveness of this approach. In addition, we also prove that general sidelobe cancellation (GSLC) performs much better than coherent sidelobe cancellation (CSLC), particularly when the angular spread of the interferences is large.