一種新型自適應天線的波達方向估計特性分析
Analysis on the estimation of direction of arrival of a novel adaptive antenna
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摘要: 針對杜惠平(1999)提出的一種基于菲涅爾相位修正聚焦結構的多波束自適應天線，利用最大似然估計算法實現了這種自適應天線的空間來波方向估計，考慮了信躁比、快拍次數和陣元間距等參數對估計結果的影響，分析了估計的統(tǒng)計性能及其克拉美-羅界，所做工作適用于透射型和反射型菲涅爾區(qū)板天線。仿真計算與有關文獻理論分析結果吻合較好，表明本文建立的菲涅爾區(qū)天線波達方向估計模型的有效性。Abstract: The problem of estimating the Direction-Of-Arrival(DOA) of multiple source sig-nals far from the sensors using a novel adaptive antenna suggested by Du Huiping(1999) in the presence of spatially white Gaussian noise is addressed based on the Maximum Likelihood(ML) function approach. The effects of the Signal to Noise Ratio(SNR), snapshots and space of sen-sors are investigated. The statistical performance of ML estimators as well as the Cramer-Rao Bound(CRB) are analyzed. Comparison of the simulation results with the other articles shows the validity of the theoretical analysis.
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J.A. Cadzow, A high resolution direction-of-arrival algorithm for narrow-band coherent and incoherent sources, IEEE Trans. on Acoust., Speech, Signal Processing, 1988, ASSP-36(7), 965-979.[2]Y. Meng, P. Stoica, K. M. Wong, Estimation of the direction of arrival of spatially dispersed signals in array processing, IEE Proc. Radar, Sonar Navig., 1996, 143(1), 1-9.[3]M. Agrawal, S. Prasad, Broadband DOA estimation using spatial-only modeling of array data,IEEE Trans. on Signal Processing, 2000, SP-48(3), 663-670.[4]武剛,杜惠平,李校林,用菲涅爾區(qū)聚焦多波束天線實現來波方向估計,電波科學學報,1999,14(3),341-346.[5]杜惠平,武剛,趙為糧,一種新型自適應天線的陣列輸出特性分析,電子與信息學報,2001,23(8),778-784.[6]杜惠平,基于菲涅爾區(qū)修正結構的多波束自適應天線,電波科學學報,1999,14(1),116-120.[7]劉樹德,羅景青,空間譜估計及其應用,合肥,中國科學技術大學出版社,1997,21-27.[8]P. Stoica.[J].A. Nchorai, Music, maximum likelihood and Cramer-Rao bound: Futher results and comparisons, Proc IEEE ICASSP89[C], Glasgow, Scotland.1989,:- -
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