干扰背景下基于双圆阵的全向测角方法

当干扰与目标方位夹角较小时，基于单圆阵的方位全向米波雷达在进行干扰对消时，目标回波的对消损失较大，从而降低了干扰对消后的目标检测概率和目标方位估计精度。针对此问题，该文提出一种基于双圆阵的干扰对消和目标方位角估计算法。该算法先利用小圆阵激励出的-1, 0和1阶相位模式初步估计干扰的方位角，后利用大圆阵激励出对称高阶相位模式获得精确的干扰方位角并利用其激励出的非对称高阶相位模式进行干扰对消和目标方位角的估计。该算法相对于单圆阵的干扰对消和测角方法可以减小目标回波的对消损失，提高干扰对消后的信噪比，从而增大目标检测概率和提高目标方位角的估计精度，仿真结果证明了该算法的有效性。

Omni-directional Angle Measurement Algorithm under Interference with Double Circular Arrays

If the azimuth angle between the interference and the detected target is small, the energy of the received signal reflected by the target may have a great loss when the interference is cancelled for an omni-directional VHF radar with single circular array. To resolve this problem, an improved algorithm based on double circular arrays is proposed. The algorithm firstly utilizes the excited phase mode -1, 0 and 1 of the small array to estimate a rough azimuth angle of the interference, and then acquires an accurate one by symmetrical phase modes of high orders of the large array. Finally, interference cancellation and estimation of targets azimuth angle are fulfilled via unsymmetrical phase modes of the large array. Compared with the algorithm based on single array, the proposed algorithm can reduce the energy loss of the useful signal and increase the estimation precision of targets azimuth angle. Simulation results demonstrate the effectiveness of the proposed algorithm.