基于空间平滑的单快拍波达方向估计算法

发布时间：2018-02-24 08:10

本文关键词： 波达方向估计相干信源空间平滑单次快拍酉变换　出处：《探测与控制学报》2015年06期 　论文类型：期刊论文

【摘要】：针对单次快拍情况下相干信源波达方向(DOA)估计的解相干和实时性问题,提出了基于空间平滑的单快拍DOA估计算法。该算法直接采用单次快拍数据的前后向空间平滑子阵,构造centro-Hermitian伪协方差矩阵,实现解相干,而无需对入射信号的初始相位作特别假定,也无需计算各个子阵的协方差矩阵,减小了计算量;利用酉变换将复数域的奇异值分解实数化,降低了计算复杂度;结合MUSIC、ESPRIT等子空间类算法,实现了相干信源的DOA估计。数值仿真表明该算法无需对入射信号的初始相位作特别假定,且对于相干信源能够有效实现单快拍DOA的快速估计,适用于对实时性要求较高的场合。
[Abstract]:In order to solve the problem of decoherence and real-time of DOA estimation of coherent sources under single beat, a spatial smoothing based DOA estimation algorithm is proposed, which directly adopts the forward and backward spatial smoothing subarray of single shot data. The pseudo-covariance matrix of centro-Hermitian is constructed to realize decoherence without special assumption of the initial phase of the incident signal and the covariance matrix of each submatrix, which reduces the computational complexity, and decomposes the singular value of the complex field into real numbers by unitary transformation. The computational complexity is reduced, and the DOA estimation of coherent source is realized by using the MUSIC-Esprit subspace algorithm. The numerical simulation shows that the algorithm does not need to make a special assumption on the initial phase of the incident signal. Moreover, the coherent source can effectively realize the fast estimation of single racket DOA, which is suitable for high real-time applications.
【作者单位】：海军航空工程学院电子信息工程系;
【基金】：国家自然科学基金项目资助(61179016)
【分类号】：TN911.23

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