张涛,袁涛,陈峰峰,等.近场条件下数字阵列雷达自适应波束形成技术研究[J].电波科学学报,2023,38(1):152-158.DOI:10.12265/j.cjors.2021231ZHANGT,YUANT,CHENFF,etal.Adaptivebeamformingofdigitalarrayradarinthepresenceofnear-field[J].Chinesejournalofradioscience,2023,38(1):152-158.(inChinese).DOI:10.12265/j.cjors.2021231近场条件下数字阵列雷达自适应波束形成技术研究张涛1,2*袁涛1,2陈峰峰1,2张广磊1,2路成军1,2(1.中国航空工业集团公司雷华电子技术研究所,无锡214063;2.航空电子系统射频综合仿真航空科技重点实验室,无锡214063)摘要针对近场条件下数字阵列雷达导向矢量幅相非一致性对自适应波束形成(adaptivebeamforming,ADBF)算法性能的影响,通过构建近场多通道数字阵列雷达回波信号模型,分析近场多通道信号二维频谱,发现在近场条件下带限干扰信号的频谱会出现非均匀分布,呈现周期性栅格分布特征,造成算法性能下降.本文提出一种具有全新干扰样本选择策略的近场ADBF(nearfieldADBF,NF-ADBF)算法,通过寻优干扰信号频谱栅格边界,在栅格区间进行多门限样本筛选,离散提取干扰信号样本,构建完备的干扰信号协方差矩阵,提升近场条件下的自适应处理性能.通过在地面搭建仿真试验环境,模拟典型的数字阵列近场工作环境,通过录取试验数据分析并与理论仿真进行对比,验证了近场干扰样本筛选策略和NF-ADBF算法模型的有效性.关键词近场;自适应波束形成(ADBF);数字阵列;干扰;样本中图分类号TN911文献标志码A文章编号1005-0388(2023)01-0152-07DOI10.12265/j.cjors.2021231Adaptivebeamformingofdigitalarrayradarinthepresenceofnear-fieldZHANGTao1,2*YUANTao1,2CHENFengfeng1,2ZHANGGuanglei1,2LUChengjun1,2(1.LeihuaElectronicTechnologyResearchInstitute,AVIC,Wuxi214063,China;2.AviationKeyLaboratoryofScienceandTechnologyonAISSS,Wuxi214063,China)AbstractDuetothenon-uniformityofthewave-frontinthepresenceofnear-field,theperformanceoftheadaptivebeamformingalgorithmhassuffereddegradation.Ontheanalysisofthemulti-channelradarreturningsignalmodeandfrequencyspectruminthepresenceofnear-field,aninterestingphenomenonhasbeenfoundthatthespectrumofthenear-fieldreturnsignalundergodistortion—“chromaticdispersion”resultingfromthefrequencyvariation.Furthermore,t...