In this paper, a direction of arrival (DOA) estimator is proposed to improve the cyber-physical interactions, which is based on the second-order statistics without a priori knowledge of the source number. The impact of noise will firstly be eliminated. Then the relationship between the processed covariance matrix and the steering matrix is studied. By applying the elementary column transformation, an oblique projector will be designed without the source number. At last, a rooting method will be adopted to estimate the DOAs with the constructed projector. Simulation results show that the proposed method performs as well as other methods, which requires that the source number must be known.

中文翻译：

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没有源编号的网络物理交互的DOA估计

在本文中，提出了一种到达方向（DOA）估计器，以改善网络与物理之间的相互作用，该估计器基于二阶统计量而无需先验源数。首先将消除噪声的影响。然后研究了处理后的协方差矩阵与控制矩阵之间的关系。通过应用基本列变换，可以设计没有源编号的斜投影仪。最后，将采用生根方法来估计所构造的投影仪的DOA。仿真结果表明，所提出的方法具有与其他方法一样好的性能，这要求必须知道源编号。