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《ACTA ELECTRONICA SINICA》 2000-03
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Frequency Angle 2D Angle Estimation of Wide Frequency Band Signals with Sub Nyquist Spatio temporal Sampling

SI De yi,LIU Rong ke,CHENG Dai song,SHEN Shi tuan,ZHOU Yin qing(Dept.of E.E.,Beijing University of Aeronautics and Astronautics,Beijing 100083,China)  
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.
【Fund】: 国防预研科学基金;; 航空九五预研课题
【CateGory Index】: TN971
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