极化域—空域联合谱估计

Joint Spectrum Estimation of Polarizational and Spatial Domains

首次提出极化域—空域联合谱的概念,拓广了电磁波特征参量的谱描述方法。结合具体的极化敏感阵列定义了极化域—空域联合谱,用MUSIC方法得到联合谱函数表达式。研究了联合谱的估计的重要性能指标:估计精度和分辨力,估计精度用克拉美劳限CRB(Cramer RaoBound)来具体度量,分辨力由极化域—空域模糊函数以及模糊图来描述。最后仿真结果验证了该方法的有效性和理论分析的正确性。

The notion of joint spectrum in polarizational and spatial domains is proposed for the first time, which can depict the EM signal completely. Based on the polarization sensitive array, the joint spectrum is defined and its analytic function is presented by using MUSIC method. The estimation accuracy and resolving power are investigated to measure the performance of joint spectrum. The Cramer-Rao Bound (CRB) is used to evaluate the accuracy of the estimated direction of the arrival and polarization angle. The ambiguity function and ambiguity area are used to evaluate the resolving power in polarizational and spatial domains. The simulations verify the superiority of the joint spectrum and coincide with the theoretical analysis.