Cross-Polarized Null-Steering in Over-the-Horizon Radar with Planar Monopole Array on Finite Radial Ground Plane

Other-the-horizon radar (OTHR) research is active in Canada at Defence Research and Development Canada (DRDC) and planar monopole arrays are under study for mitigating the adverse effects of the auroral clutter in OTHR using null-steering techniques. Unfortunately, the ground system for the monopoles is made of radials and is limited in size. This introduces cross-polarized radiation that potentially reduces the OTHR performance if not accounted for. This performance reduction is evaluated in this paper, and straightforward joint co-polarized and cross-polarized null-steering is demonstrated.