分布式嵌套阵列及其DOA估计

提出了一种分布式嵌套阵列天线结构，由两个相互独立的四级嵌套子阵构成。两个子阵间存在一个基线长度，且满足一定条件。对该阵列天线接收到的信号进行高阶累积量和Khatri-Rao积运算可以得到三个完全相同的均匀直线阵列天线结构。针对新得到的阵列天线结构，使用基于空间平滑技术的双尺度酉旋转不变子空间（ESPRIT）波达方向（DOA）估计算法对信号进行DOA估计。该方法可以有效地提高阵列天线的自由度，进而达到提高估计精度的目地。仿真结果证明了基于所提出阵列天线结构的DOA估计方法的有效性。

Distributed nested array and its DOA estimation

A distributed nested array composed of two independent four-level nested sub-arrays is proposed.There exists a baseline between the two sub-arrays,and the baseline meets the corresponding condition.According to the array,three identical uniform linear arrays(ULAs) can be obtained through high order cumulant and Khatri-Rao product operation of the received signals.The unitary estimation of signal parameters via rotation invariance techniques(ESPRIT) based on the spatial smoothing method is applied to the new array to estimate the direction of arrival(DOA).The algorithm can efficiently improve the degree of freedom.The simulation results prove the effectiveness of the proposed algorithm.