摘要
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 .
A method is presented for estimation of the frequency,azimuth and elevation angles of the signal over a very wide frequency band (2～18GHz) with sub Nyquist spatio temporal sampling.Using a uniform circular array and antennas time delaying,it can provide unambiguous frequency estimation under temporal undersampling,and provides unambiguous azimuth and elevation estimation using integer search algorithm under spatial undersampling.The estimations of azimuth and elevation and corresponding frequency are automatically paired.It not noly can use second order statistics in element space or DFT beamspace,but also can use fourth order cumulants to estimate the parameters of non Gaussian sources in Gaussian white or colored noises.The variance of the azimuth and elevation estimates of this method is 1～2 orders less than that of L shaped array algorithm under the same antenna numbers and the maximum aperture in DFT beamspace.Simulations are presented to show the capabilities of the algorithm.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2000年第3期9-12,共4页
Acta Electronica Sinica
基金
国防预研科学基金
航空九五预研课题
关键词
时空欠采样
参数估计
信号频率
二维角
宽频段
sub Nyquist spatio temporal sampling
fourth order cumulants
three dimensional parameters estimation
automatic pair
Gaussian noise
