基于参考阵元的TDM MIMO FMCW雷达运动补偿方法  

Motion compensation method based on reference-element for TDM MIMO FMCW radar

作　　者：林沂 孙占山 郭敏 付云起[1] LIN Yi;SUN Zhanshan;GUO Min;FU Yunqi(College of Electronic Science and Technology,National University of Defense Technology,Changsha 410073,China)

机构地区：[1]国防科技大学电子科学学院,长沙410073

出　　处：《电波科学学报》2020年第4期523-530,共8页Chinese Journal of Radio Science

基　　金：国家自然科学基金(61901492,61601478)。

摘　　要：针对时分复用(time division multiplexing,TDM)多输入多输出(multiple-input multiple-output,MIMO)调频连续波(frequency modulated continuous wave,FMCW)雷达的速度-角度耦合问题,提出一种基于参考阵元的运动补偿方法.把MIMO阵列组合阵元T 1/R 1等效的虚拟阵元1选定为参考阵元,通过对参考阵元接收的2个调制周期信号进行处理,提取运动引入的相邻阵元相位差,利用该相位差构建相位补偿因子消除运动引入的相位,实现运动目标的精确角度估计.该方法采用固定的基于参考阵元的TDM时序,无需根据工作场景调整TDM时序,且不需要估计目标的速度,避免了模糊速度估计问题.仿真结果和实验结果验证了该方法的有效性.Aiming at the velocity-angle coupling problem of time division multiplexing(TDM)multiple-input multiple-output(MIMO)frequency modulated continuous wave(FMCW)radar,a motion compensation method based on reference-element is proposed to realize the accurate direction estimation of moving targets.The first virtual element equivalent to the combined element T 1/R 1 of MIMO array is selected as the reference array element.The motion-induced phase is extracted by processing the signals of the reference element,then the compensation factor is constructed to complete the motion compensation of the virtual array.The simulation results and experimental results verify the effectiveness of the proposed method.The method uses fixed switching scheme based on reference element.It is not necessary to adjust the switching scheme according to the specific scene.Moreover,the method does not need to estimate the velocity,even if when the target speed is ambiguous,the method can still accurately estimate the direction of the target.

关 键 词：多输入多输出(MIMO) 调频连续波(FMCW) 参考阵元 角度估计 运动补偿 

分 类 号：TN951[电子电信—信号与信息处理]