近场条件下数字阵列雷达自适应波束形成技术研究  

Adaptive beamforming of digital array radar in the presence of near-field

作　　者：张涛 袁涛 陈峰峰 张广磊 路成军 ZHANG Tao;YUAN Tao;CHEN Fengfeng;ZHANG Guanglei;LU Chengjun(Leihua Electronic Technology Research Institute,AVIC,Wuxi 214063,China;Aviation Key Laboratory of Science and Technology on AISSS,Wuxi 214063,China)

机构地区：[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

出　　处：《电波科学学报》2023年第1期152-158,共7页Chinese Journal of Radio Science

基　　金：国防基金(61404130114);航空科学基金(20172007002)。

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(adaptive beamforming,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(near field ADBF, 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.Due to the non-uniformity of the wave-front in the presence of near-field, the performance of the adaptive beamforming algorithm has suffered degradation. On the analysis of the multi-channel radar returning signal mode and frequency spectrum in the presence of near-field, an interesting phenomenon has been found that the spectrum of the near-field return signal undergo distortion — “ chromatic dispersion” resulting from the frequency variation. Furthermore, the interference sample selection would be so insufficient that the completed sample covariance matrix does induce the inhomogeneous spectrum partition, resulting in the effectiveness of the adaptive digital beamforming(ADBF) algorithm. Based on the characteristic of special spectrum, a new near-field ADBF(NF-ADBF)algorithm is proposed with different sample division strategy and hierarchical threshold set in the grid region to increase the corrosion property of adaptive processing. Through constructing ground simulation test environment to accomplish data acquisition, the proposed NF-ADBF method and novel sample recombination tactics are proved.

关 键 词：近场 自适应波束形成(ADBF) 数字阵列 干扰 样本 

分 类 号：TN911[电子电信—通信与信息系统]