摘要
针对经典的最小方差无畸变响应波束形成器应用在FDA-BFF(Frequency Diverse Array Based On Fre-quency Filter,FDA-BFF)及FDA-MIMO(Frequency Diverse Array Multiple-Input Multiple-Output,FDA-MIMO)接收机结构时,当阵元数较大或干扰与目标角度维接近时波束主瓣会产生峰值畸变或偏移,波束形成器输出性能下降,无法有效确定目标位置的问题,提出了基于双边小方差无畸变响应的子阵频控阵波束形成算法。该算法将一维均匀线性阵列划分为两个采用不同非线性频偏的中心对称子阵结构,在目标位置形成点状波束,对传统频偏固定的频控阵方向图中的距离-角度实现解耦。之后,通过双边小方差无畸变响应算法中求解克罗内克积的方式降低了算法计算量。仿真验证表明,阵元数较大时该算法在目标位置处形成点状波束的同时,可以有效抑制角度维不可分的干扰。
The classic Minimum Variance Distortionless Response(MVDR)beamformer is applied to FDA-BFF(Frequency Diverse Array Based On Frequency Filter,FDA-BFF)and FDA-MIMO(Frequency Diverse Array Multiple-Input Multiple-Output,FDA-MIMO)in the case of the three receiver configurations,when the number of elements is large or the interference is close to the target angle dimension,the main beam of the beam will produce a peak distortion or offset,and the beam-former output performance will decrease,and the target position cannot be determined effectively.For the problem,a sub-matrix FDA beamforming algorithm based on TS-MVDR is proposed.The algo-rithm divides the one-dimensional uniform linear array into two centrally-symmetric sub-arrays with different nonlinear frequency offsets,forms a spot beam at the target position,and realizes the dis-tance-angle in the frequency-alignment fixed pattern with a fixed frequency offset decoupled.After-wards,the computational cost of the algorithm is reduced by solving the Kronecker product in the bi-lateral MVDR algorithm.The simulation results show that when the number of array elements is large,the algorithm can effectively suppress the angle-indivisible interference while forming a point beam at the target position.
作者
张晶
谢军伟
王博
孙渤森
ZHANG Jing;XIE Jun-wei;WANG Bo;SUN Bo-sen(Shanxi Transportation and Vocational Technology University,Xi’an 710018,China;School of Air and Missile Defense,Air Force Engineering University,Xi’an 710051,China;Xi’an University of Finance and Economics,Xi’an 710100,China)
出处
《火力与指挥控制》
CSCD
北大核心
2019年第11期4-10,共7页
Fire Control & Command Control
基金
国家自然科学青年基金资助项目(61503408)
关键词
频控阵
双边最小方差无畸变响应
非线性频偏
子阵
发射方向图
frequency diverse array
bilateral minimum variance undistorted response
onlinear frequency deviation
subarray
transmit beampattern
