虚拟孔径高分辨测角方法

High Resolution Angle Measurement Method of Virtual Aperture

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。

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.