基于二次虚拟内插的圆阵接收2D-DOA分离估计

该文将二次虚拟内插技术引入圆阵接收的2D-DOA分离估计中，通过两次虚拟内插获取两虚拟内插阵列之间的移不变因子，利用该移不变因子首先获得俯仰角的估计，再将估计到的俯仰角代入圆阵流型中，经一维搜索即可获得方位角的估计。该方法有效地减小了因虚拟阵列和真实阵列之间的内插误差所带来的估计误差，仿真实验验证了该方法的有效性。

Circle Array Receiving Signal 2D-DOA Separable Estimation Based on Twice Virtual Interpolations

In this paper, the twice virtual interpolations is introduced into the circle array receiving signal 2D-DOA separable estimation, twice virtual interpolations are used to get the rotational invariance factor, the factor is used to get the estimation of elevation angle, then the estimated elevation angle is substituted into the circle array manifold, thus the azimuth angle can be get by one dimensional search. This method reduced the estimation error because of the interpolation error between the virtual array and the real array efficiently, simulation results validate the efficiency of the method.