互耦条件下涡旋电磁波目标方位探测方法  

Target Bearing Estimation Using Vortex Electromagnetic Waves with Mutual Coupling

作　　者：章鸿运 栗苹[1] 李国林[1] 贾瑞丽[1] ZHANG Hongyun;LI Ping;LI Guolin;JIA Ruili(Key Laboratory of Electromechanical Dynamic Control,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京理工大学机电动态控制重点实验室,北京100081

出　　处：《兵工学报》2023年第10期3218-3226,共9页Acta Armamentarii

基　　金：国家自然科学基金项目(62073040)。

摘　　要：采用均匀圆阵产生涡旋电磁波时,天线阵元的辐射方向图受到邻近阵元互耦的影响,发射信号幅度和相位会发生改变,进而影响目标方位探测性能。针对此问题,利用均匀圆阵互耦矩阵的循环对称性,通过傅里叶变换将互耦矩阵展开为模式域,描述阵元激励与轨道角动量模式数之间的关系,并提出一种基于轨道角动量的改进传播算子解耦合方位估计算法。与传统算法相比,该算法避免了谱峰搜索和大特征值分解;同时,利用涡旋电磁波原始导向矢量对回波信号进行处理,规避了贝塞尔函数近似带来的误差。仿真结果表明:模式域互耦矩阵有效补偿了互耦效应的影响;所提算法较传统传播算子算法相比估计精度更高,同时计算复杂度更低。The use of a uniform circular array to generate vortex electromagnetic waves can lead to changes in the radiation pattern of antenna elements due to mutual coupling between adjacent array elements,causing variations in amplitude and phase that affect target azimuth detection performance.To address this problem,the mutual coupling matrix is expanded into the mode domain by Fourier transform using the symmetric circulant of the uniform circular array mutual coupling matrix.This allows for describing the relationship between array element excitation and the number of orbital angular momentum modes.Based on the above analysis,an improved propagation operator decoupling azimuth estimation algorithm based on orbital angular momentum is proposed,which avoids spectral peak search and large eigenvalue decomposition.Simulation results show that the mutual coupling matrix in the mode domain effectively compensates for the influence of the mutual coupling effect.Compared with traditional algorithms,the proposed algorithm boasts lower computational complexity and avoids errors stemming from Bessel function approximations.

关 键 词：涡旋电磁波 互耦 均匀圆阵 传播算子 方位估计 

分 类 号：TJ43[兵器科学与技术—火炮、自动武器与弹药工程]