基于方向图拟合与稳健波束形成的相关测向

为了弥补阵列天线导向矢量失配和相位测量噪声对测向性能的影响,提出基于方向图拟合与稳健Capon波束形成技术（robust Capon beamforming,RCB）的双向迭代矢量相关测向方法。利用方向图与信号能量空间分布的相似性,对目标信号来波方向进行聚焦搜索;区别于传统相关干涉仪测向方法,在聚焦区间内将基于RCB的导向矢量迭代估计与相关干涉测向方法融合,在保证测向精度的前提下对目标信号方向进行双向迭代测量。仿真结果表明,该方法能够弥补阵列流型失配和相位噪声的影响,准确测量来波信号方向。

Correlative direction finding based on pattern fitting and robust beamforming

In order to compensate the impact of the antenna array steering vector mismatch and the phase noise, the bidirectional iterative vector correlation angle measurement is proposed based on pattern fitting and robust Capon beamforming (RCB). The new method firstly uses the comparability between pattern and signal energy distribution to focus the direction of the target signal. Then different from the traditional method of correlation interferometer direction finding, combine the method of steering vector iteration based on the RCB with the method of direction finding correlation interferometer in the focus range, then determines the direction of the target signal by fitting the correlation signal vector. And then in the premise of ensuring the accuracy of direction finding, measure the target signal direction using the bidirectional iterative method. Simulation results show that the new method can compensate the impact of the steering vector mismatch and phase measurement noise, accurately measure the target signal direction.