分布式相参雷达自适应和差波束测角方法  

Angle measurement method for distributed coherent radar based on adaptive sum and difference beamforming

作　　者：龙锦荣 吴建新 梁毅[2] LONG Jinrong;WU Jianxin;LIANG Yi(School of Electronics and Communication Engineering,Sun Yat-sen University,Shenzhen 518000,China;National Key Laboratory of Radar Signal Processing,Xidian University,Xi’an 710071,China)

机构地区：[1]中山大学电子与通信工程学院,广东深圳518000 [2]西安电子科技大学雷达信号处理国家重点实验室,陕西西安710071

出　　处：《系统工程与电子技术》2025年第3期779-787,共9页Systems Engineering and Electronics

基　　金：国家自然科学基金(61971326,62101603,62201623,62001468);广东省自然科学基金(2021A1515011979)资助课题。

摘　　要：分布式相参雷达在抗干扰和目标探测性能方面具有明显优势,但分布式构型带来的栅瓣问题给目标到达方向(direction of arrival,DOA)估计带来很大的困难。在均匀分布式相参阵列的基础上,拓展和差波束形成(sum and difference beamforming,SDB)方法至分布式阵列的栅瓣区域,并采用双指向法分析鉴角曲线(angular response curve,ARC)特性,提出一种基于多载频自适应SDB(multi-frequency adaptive SDB,MF-ASDB)的解模糊测角方法。该方法在不同频点下利用密集栅瓣辅助扫描检测,通过ASDB方法计算模糊主值后,将其拓展得到包含目标真实角度的DOA模糊值;根据频率与栅瓣周期之间的角度偏移关系,使用最小二乘方法实现DOA解模糊。仿真结果验证了所提方法的有效性。Distributed coherent radar has obvious advantages in anti-jamming and performance of target detection.However,the grating lobes caused by distributed configuration bring great difficulties to estimation of direction of arrival(DOA)for target.Based on the uniform distributed coherent array,the sum and difference beamforming(SDB)method is expanded to the grating lobes region of distributed arrays,and the characteristics of angular response curve(ARC)is analyzed using double-direction method.A fuzzy resolution angle measurement method is proposed based on multi-frequency adaptive SDB(MF-ASDB)algorithm.At different frequencies,this method finishes scanning and detecting with the help of dense grating lobes,calculates the main fuzzy value with ASDB method,which is extended to obtain DOA ambiguity values including true angles of targets.According to the angular offset relationship between frequencies and periods of grating lobes,the least squares method is used to achieve DOA fuzzy resolution.Simulation results verify the effectiveness of the proposed method.

关 键 词：到达方向估计 分布式相参雷达 自适应和差波束形成 多频解模糊 鉴角曲线 

分 类 号：TN911.23[电子电信—通信与信息系统]