基于四阶累积量的来波信号频率和二维角估计

FREQUENCY AND 2D ANGLE ESTIMATION OF SIGNALS BASED ON FOURTH-ORDER CUMULANTS

本文提出了一种基于四阶累积量的来波信号频率、方位角和仰角三维参数估计的算法。该算法采用无方向模糊的均匀圆阵 (阵元数大于 6 )和阵元延时 ,实现高斯白或色噪声环境下非高斯信源的参数估计 ,且三维参数可自动配对 ;在空间欠采样条件下 ,使用整数搜索法实现方位角和仰角无模糊估计。

An algorithm based on fourth order cumulants is presented for estimation of the frequency,azimuth and elevation angles of multiple non Gaussian spatial signals in white or colored Gaussian noises.The algorithm employs unambiguous uniform circular arrays for direction finding and time delay of array element outputs,and provides unambiguous azimuth and elevation estimation using integer search algorithm under spatial undersampling.The estimations of azimuth and elevation angles are automatically paired with corresponding frequency estimates.Simulations are presented demonstrating the capabilities of the method.