Real-Time Frequency and 2-D Angle Estimation Method with Sub-Nyquist Sampling
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摘要: 提出了用均匀平行线阵和阵元输出信号的时间延迟估计时间欠采样来波频率、方位角和仰角的方法.该算法在DFT波束空间使用PRO-ESPRIT方法,实现频率无模糊估计,完成来波信号频率和角度的估计.频率间接估计算法是先估计数字频率,然后用数字频率求模拟频率,其估计方差比直接估计算法的方差要小几个数量级.仿真实验表明了算法的有效性.Abstract: A method is proposed to estimate real-time frequency and azimuth and elevation angles of arrival with parallel uniform linear arrays and elements output signal delay.The method uses PRO-ESPRIT algorithm in DFT beam-space.It can estimate the frequency and angles with sub-Nyquist sampling.The analog frequency is estimated by general eigenvalue in the direct method.The alias zone of frequency can be determined by the estimation of analog frequency.Then,the digital frequency is estimated,and the analog frequency is calculated by digital frequency in the indirect method.The variance of the frequency estimates of indirect method is more little than that of the direct method.Simulations are presented demonstrating the capabilities of the method.
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Key words:
- frequency measurement /
- orientation /
- parameter estimation /
- sub-Nyguist sampling
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1. 何峻湘,周荫清用于测向测速的二维谱估计方法电子科学学刊,1994,16(5) 2. Tufts D W,Ge H Y.Digital estimation of frequencies of sinusoids from wide band under sampled data.Proc ICASSP,Detroit,MI,USA:IEEE,1995,3155~3158 3. Zoltowski M D,Mathews C P.Real-time frequency and 2-D angle estimation with sub-Nyquist spatio-temporal sampling.IEEE TRANS ON SP,1994,42:2781~2794 -
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