强干扰下基于三阶互累积量的FMCW雷达信号DOA估计算法

FMCW Radar Signal DOA Estimation Method Based on the Third-Order Cross Cumulant Under High Interference

针对车载调频连续波雷达存在相互干扰的实际情况,本文提出了一种基于三阶互累积量的多目标波达方向超分辨估计方法.该方法利用同步采集的阵列信号并根据回波信号和干扰信号的非相关特性,构造三阶互累积量矩阵,随后根据子空间方法获得二维空间谱,实现距离和方位的联合估计.计算机仿真结果表明,本文所提方法能够在抑制强干扰影响的同时实现3°以内多目标识别,与现有超分辨法和重构法相比,具有更高的角度分辨率和估计精度.

In order to handle the realistic issue of mutual interference in vehicle-mounted frequency-modulated con⁃tinuous wave radars,this paper proposes a super-resolution direction of arrival estimation approach based on the third-or⁃der cross cumulant.According to the property of non-correlation between the echo signals and the interference signals,the method uses the synchronously sampled array signals to build a third-order cross cumulant matrix,which is then used to obtain a two-dimensional spatial spectrum using the subspace method for joint range and bearing estimation.Simulation results demonstrate that the proposed method can suppress the effect of strong interference and identify multiple targets within 3 degrees.Compared with the existing super-resolution and reconstruction methods,the method has higher angular resolution and estimation accuracy.