电讯技术2016，Vol.56Issue(5)：568-574,7.DOI:10.3969/j.issn.1001-893x.2016.05.016
小孔径天波超视距雷达多径模糊污染消除及海杂波抑制
Multipath Fuzzy Contamination Elimination and Sea Clutter Suppression for Small Aperture Sky-wave Over-the-horizon Radars
摘要
Abstract
Multipath propagation,caused by the layered structure of ionosphere,makes one target appear in different range cells,which leads to an inaccurate result of target identification. The receiving array of con-ventional sky-wave over-the-horizon radar( OTHR) is uniform linear array which doesn’t have the resolu-tion capability of elevation direction while small aperture OTHR system has it,because of its uniform circu-lar receiving array. To solve the problem of multipath propagation,this paper proposes to make adaptive beamforming in elevation direction with the result of geometric estimation and spectrum estimation under small aperture system. Moreover,to develop signal-to-clutter ratio( SCR) of echo signal,it improves the o-cean clutter suppression algorithm that is based on singular value decomposition( SVD) . Theoretical analy-sis and simulation result prove the proposed algorithm can eliminate multipath effect efficiently and avoid false targets. Besides,the improved SVD suppression algorithm increases the quality of ocean clutter sup-pression.关键词
天波超视距雷达/多径模糊/小孔径/海杂波抑制/二维阵列/自适应波束形成Key words
sky-wave over-the-horizon(OTHR) radar/multipath fuzzy/small aperture/sea clutter sup-pression/2-D array/adaptive beamforming分类
信息技术与安全科学引用本文复制引用
贾愚,贺青,罗来源..小孔径天波超视距雷达多径模糊污染消除及海杂波抑制[J].电讯技术,2016,56(5):568-574,7.
