虚拟孔径高分辨测角方法

High Resolution Angle Measurement Method of Virtual Aperture

  • 摘要: 针对天线阵列中阵元个数有限而导致波达方向DOA估计分辨率较低的问题,该文提出了一种基于宽频跳变信号相位补偿的虚拟孔径重构方法。该方法通过利用宽频跳变信号,将多个频点的信号向量加入补偿相位形成虚拟导向矢量,从而形成远大于物理孔径的虚拟孔径,实现高分辨DOA估计。仿真实验结果表明,该文所提的虚拟阵列重构方法可有效地提高DOA估计的角度分辨率,且具有较小的计算复杂度。

     

    Abstract: Considering the low angle resolution of direction of arrival (DOA) estimation caused by the limited number of elements in the antenna array, a virtual aperture reconstruction method is proposed in this paper, which is based on phase compensation of broadband hopping signals. Besides it, a virtual steering vector is constructed resorting to phase compensation on the signal vector at multiple frequency points of the broadband hopping signal. Finally, a virtual aperture much larger than the physical aperture is formed, which is capable of high-resolution DOA estimation. The simulation experiment results show that the virtual array reconstruction method in this paper can effectively improve the angle resolution of the DOA estimation with a small computational complexity.

     

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