电讯技术2024，Vol.64Issue(4)：567-576,10.DOI:10.20079/j.issn.1001-893x.230118005
基于波束优化赋形方法的斜视星载SAR模糊抑制研究
Suppressing Range and Doppler Ambiguity by Optimal Beamforming for Squinted Spaceborne SAR
摘要
Abstract
The range and azimuth ambiguity often lead to deteriorated influence on the quality of the spaceborne synthetic aperture radar(SAR)images.The existing ambiguity suppression methods via antenna beamforming get excellent effect in the radar broadside imaging mode,but cannot work well in squinted case.To deal with this problem,a method based on planar array antenna pattern synthesis is proposed,which successfully suppresses both the range and azimuth ambiguity.First,to substitute the range ambiguity to signal ratio(ASR)and azimuth ambiguity to signal ratio,the ASR is introduced.Next,by analyzing the antenna beam in squinted SAR,an ASR-array weight optimization model is proposed which consideres all ambiguity areas including mirrors.Then,the quadratic cone programming(QCP)problem is built to minimize the ambiguity energy under the antenna mask constraints.Further,the array amplitude and phase distribution can be accordingly acquired by solving this problem.The simulation results show that the proposed method can flexibly reduce the range and azimuth ambiguity energy of squinted SAR by adjusting the sidelobes in ambiguity areas,thereby improving the imaging quality of spaceborne SAR.关键词
星载合成孔径雷达/模糊抑制/天线方向图综合/波束优化赋形Key words
space borne synthetic aperture radar(SAR)/ambiguity suppression/antenna pattern synthesis/optimal beamforming分类
信息技术与安全科学引用本文复制引用
王长城,张毅,张永伟,王伟..基于波束优化赋形方法的斜视星载SAR模糊抑制研究[J].电讯技术,2024,64(4):567-576,10.基金项目
中国科学院青年创新促进会项目(2020123) （2020123）
