共形阵空域极化域联合滤波研究

Filtering of polarization-space domain

给出了完全极化情形下由N个正交偶极子构成的极化敏感阵列(共形阵)滤波性能。期望信号和干扰信号来自任意方向,并且任意极化,利用最小均方误差(LMS)自适应算法,推导了输出信号干扰噪声比(SINR)的计算公式。与普通阵列相比较,极化敏感阵列不仅可以在空域滤波,而且可以在极化域滤波,当干扰和期望信号到达角差别较大时,阵列通过调整方向特性抑制干扰、增强信号;当干扰信号和期望信号到达角接近时,仍然可以利用它们极化状态的差异提高SINR。具体算例和仿真结果验证了理论分析的正确性。

The interfering performance of polarization sensitive array （conformal array） consisting of N pairs of crossed dipoles is proposed theoretically. The desired signal and interference are completely polarized and come from random directions. With the Least Mean Square （LMS） arithmetic, the formulation of output signal interference plus noise ratio（SINR） of polarization- sensitive adaptive antenna will be work out. Contrasted to the common antenna array with same hardware equipment, its advantages are mainly embodied by the joint filterability in polarizing domain and spatial domain. The interference must come from the same direction and with same polarization as the desired signal to gain the low SINR. Numerical examples and results verify the correctness of the theoretical deduction.