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阵列存在互耦误差时,由于理想导向矢量与实际导向矢量之间存在偏差,使得高分辨空间谱估计方法性能恶化.本文针对圆台共形阵列,充分利用其结构分布特性,以互耦矩阵呈复共轭对称分布为前提推导出了圆台共形阵列的互耦矩阵模型.在此基础上,利用两种模式对互耦矩阵进行分解,由此建立了两种基于圆台共形阵列的互耦误差自校正模型.两种模型均可以实现存在互耦误差时的圆台共形阵列DOA估计,且校正后的导向矢量与实际导向矢量之间的相关程度得到明显改善.另外,本文所提的互耦自校正方法具有较低的信噪比门限.理论分析和仿真结果证实了本文两种模型的有效性,可以为共形阵列的工程应用提供参考.
When the array has the mutual coupling error, the performance of the high resolution spatial spectrum estimation method is deteriorated due to the deviation between the ideal steering vector and the actual steering vector.This paper takes full advantage of the structural distribution characteristics of the circular array conformal array to the mutual coupling matrix Conjugate symmetric distribution as the premise, the mutual coupling matrix model of conical array of truncated cones is deduced.On the basis of this, the mutual coupling matrix is decomposed by two modes, and then two kinds of mutual coupling errors Self-tuning model. Both models can realize DOA estimation of frustoconical array in the presence of mutual coupling error, and the correlation between the corrected steering vector and the actual steering vector is significantly improved. In addition, the mutual coupling The self-calibration method has a lower threshold of signal-to-noise ratio.The theoretical analysis and simulation results verify the validity of the two models in this paper, which can provide reference for engineering applications of conformal arrays.