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第28卷第5期 文章编号:1006—9348(2011)05=0068—04 计算机仿真 2011年5月 卫星通信中一种改进的DOA算法 张瑜,黄登山,李欢欢 (西北工业大学电子信息学院,陕西西安710072) 摘要:在卫星通信系统的阵列信号处理中,由于阵列孔径的限制,现有DOA解相干算法所能够分辨的信源数以及能够达到 的谱分辨率一直不高,导致不能精确定位信号波达方向,卫星通信无法准确传递信息。因此,提出一种分辨率高、稳定性好 的解相干算法(MSVD),利用人射信号的非圆对称性,对原阵列进行有效的扩展,得到新的虚拟阵列,再用SVD算法对新的 阵列进行谱峰搜索。仿真结果表明,MSVD算法与SVD算法相比,其精度更高、稳定性更好、分辨率更高、且可以估计的信源 数更多。 关键词:波达方向;解相干;高分辨率;高稳定性;非圆对称性 中圈分类号:TP301.6 文献标识码:A A Modified DoA Algorithm of Satellite Communication ZHANG Yu,HUANG Deng—shan,LI Huan—huan (Dept of Electronics and Information,Northwestern Polytechnical University,Xi’an Shanxi 710072,China) ABSTRACT:Due to the limitation of the ape ̄ure of the array in array signal processing of satellite communication system,the number ofthe signals,which the existing decorrelate coherent SOUrCes algorithms could handle,a8 we//as the spectral resolution,is not big,which leads to imprecise location of DOA,then,satellite communication cannot accurately transmit iformatnion.So a high resolution and stability algorithm which Can decorrelate coherent SOUl ̄es is needed.In this paper,such a new algorithm(MSVD)is proposed,which expands het aperture of the array efective- ly when the sinals are noncirgularly symmetirc.Then we call search spectral peak by SVD algorithm.The computer simulations show that,compared with SVD algorithm,MSVD algorithm has higher accuracy,better stability and high- er resolution.Also,it Can handle more sinagl sources than SVD algorithm. KEYWORDS:DOA;ecorrelation;High resolution;Hi stability;Noncirul