论文部分内容阅读
本文提出了一种时空欠采样宽频段 (2～ 18GHz)信号频率、方位角和仰角三维参数估计方法 .该方法采用均匀圆阵和阵元延时 ,可在时间欠采样条件下实现频率无模糊估计 ;在空间欠采样条件下 ,用整数搜索法实现方位角和仰角无模糊估计 ,且频率、方位角和仰角估计可自动配对 .该方法不仅可用于二阶统计量阵元空间和DFT波束空间 ,而且还可用于四阶累积量 ,可在高斯白或色噪声背景下 ,估计非高斯信源的参数 .在DFT波束空间、阵元数相同和最大孔径相当时 ,该方法方位角和仰角估计的方差比L阵方法的方差小 1～ 2个数量级 .仿真实验表明了算法的有效性 .
In this paper, a method of three-dimensional parameter estimation of signal frequency, azimuth and elevation in wide-band (2 ~ 18GHz) under-sampling in space-time is proposed.The method uses uniform circular array and array element delay to achieve frequency-free ambiguity Estimation; Under the condition of space undersampling, the azimuth and elevation angles can be unambiguously estimated by the integer search method, and the frequency, azimuth and elevation estimation can be automatically paired. This method can be used not only for the second-order statistics element space and DFT beam space , But also for the fourth-order cumulants, the parameters of non-Gaussian sources can be estimated in the background of Gaussian white or colored noise.When the DFT beam space, the same number of elements and the same maximum aperture, the method of azimuth and elevation estimation The variance of L array method is 1 ~ 2 orders of magnitude less than that of L array method.The simulation results show the effectiveness of the algorithm.