共查询到20条相似文献,搜索用时 15 毫秒
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本文提出了一种相干源波达方向估计算法.该方法利用C-SPRIT思想,通过构造数据矩阵,使得无论是否存在相干信号,均能很好估计信号波达方向(DOA).传统的空间平滑技术通过子阵平滑来解决相干源DOA估计问题,但信号之间并没有完全解相干,孔径损失也很大,且最多只能估计2N/3个相干源(N为阵元数目).本文方法也采用空间平滑去相干的思想,但无孔径损失,信号之间完全解相关,提高了相干源DOA估计精度,并且能估计N-1个相干源,该方法利用ESPRIT数值求解进行角度估计,无需角度搜索,运算量小,计算机仿真验证了该方法的有效性和优越性. 相似文献
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提出了共轭增强ESPRIT(CA-ESPRIT)算法,利用阵列输出的延迟相关函数及其共轭形成伪阵列输出,从而得到伪协方差矩阵,对其进行特征分解,用ESPRIT算法得到波迭方向。仿真实验表明,新算法可对多于阵元数的信号进行测向,其测角精度和分辨能力优于ESPRIT算法,运行时间小于有相同阵列扩展能力的MUSIC—like算法。 相似文献
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针对阵列天线的波达方向估计问题,给出了一种新颖的ESPRIT算法--共轭ESPRIT算法(C-ESPRIT).此算法利用阵列单元输出信号的共轭信息,得到整个阵列输出的协方差矩阵,通过对此矩阵的特征分解,并构造运算矩阵,最终求得信号的波达方向.仿真实验表明,C-ESPRIT算法不仅克服了传统ESPRIT算法在阵列单元数与信源数相同时不能可靠测向的不足,并且对信号波达方向的分辨能力和测角精度也显著高于传统的ESPRIT算法,因此,C-ESPRIT算法具有更广泛的适应性和更优越的测向性能. 相似文献
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In this paper, we present an asymptotic performance analysis of three subspace-based methods for direction of arrival (DOA) estimation-the ESPRIT algorithm using second order statistics, the higher order ESPRIT algorithm using fourth-order cumulants, and the virtual ESPRIT (VESPA) algorithm using fourth-order cumulants. We examine the least-squares version of these algorithms, derive the expressions for the asymptotic variance of the estimated DOAs, and use specific examples to compare the relative performance of the algorithms. Finally, we present Monte Carlo simulations to validate the theoretical analysis 相似文献
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Beamspace ESPRIT 总被引:9,自引:0,他引:9
Guanghan Xu Silverstein S.D. Roy R.H. Kailath T. 《Signal Processing, IEEE Transactions on》1994,42(2):349-356
Most high-resolution algorithms for sensor array processing require an eigendecomposition, which is a computation that is difficult to implement in parallel and requires O(M3) multiplications for an M×M matrix, corresponding to M sensors. Beamspace transformation is one way of reducing computation and sometimes improving the estimation accuracy. As a consequence of the beamspace transformation performed, however, arrays such as uniform linear arrays commonly used in direction finding lose their displacement invariance structure. As a result, computational complexity may actually increase since the computationally efficient ESPRIT algorithm cannot be applied directly. In this paper, a method for restoring the invariance structure resulting in a beamspace ESPRIT algorithm is described. Asymptotic performance analysis of beamspace ESPRIT and simulation results are presented as well 相似文献
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Multiresolution ESPRIT algorithm 总被引:4,自引:0,他引:4
Lemma A.N. van der Veen A.-J. Deprettere E.F. 《Signal Processing, IEEE Transactions on》1999,47(6):1722-1726
Multiresolution ESPRIT is an extension of the ESPRIT direction finding algorithm to antenna arrays with multiple baselines. A short (half wavelength) baseline is necessary to avoid aliasing, and a long baseline is preferred for accuracy. The MR-ESPRIT algorithm allows the combination of both estimates. The ratio of the longest baseline to the shortest one is a measure of the gain in accuracy. Because of various factors, including noise, signal bandwidth, and measurement error, the achievable gain in accuracy is bounded 相似文献
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The authors present a variant of ESPRIT, known as the resolution enhanced (RE)-ESPRIT, that lowers resolution thresholds by incorporating left weighting of the signal eigenvectors to provide sector focusing. They discuss the advantages of this new left weighted ESPRIT. A compact expression for the asymptotic covariance matrix of the estimates is presented. Analytical and simulation results are included to show the resolution improvement of ESPRIT 相似文献
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Multiple invariance ESPRIT 总被引:8,自引:0,他引:8
Swindlehurst A.L. Ottersten B. Roy R. Kailath T. 《Signal Processing, IEEE Transactions on》1992,40(4):867-881
A subspace-fitting formulation of the ESPRIT problem is presented that provides a framework for extending the algorithm to exploit arrays with multiple invariances. In particular, a multiple invariance (MI) ESPRIT algorithm is developed and the asymptotic distribution of the estimates is obtained. Simulations are conducted to verify the analysis and to compare the performance of MI ESPRIT with that of several other approaches. The excellent quality of the MI ESPRIT estimates is explained by recent results which state that, under certain conditions, subspace-fitting methods of this type are asymptotically efficient 相似文献
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The multi-least-squares fitting and regularization formulations of the Estimation of Signal Parameters via Rotational Invariance
Techniques (ESPRIT) problem are herein presented to provide a new framework for developing the closed-form multiple invariance
ESPRIT (MI-ESPRIT) algorithm. The resulting two closed-form MI-ESPRIT algorithms incorporate all invariances in arrays composed
of several (more than one) equally translated identical subarrays, and maintain the computational advantage of the standard
single invariance ESPRIT.
This work was supported by the National Nature Science Foundation of China (no. 60272025). 相似文献
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两种快速ESPRIT算法 总被引:4,自引:1,他引:4
在众多的高分辨谱估计算法中,ESPRIT算法由于不需进入谱搜索而具有小得多的运算量。本文提出两种ESPRIT算法的加速方法,空分法和时移法,可进一步减少运算量。同时还给出了两种改进算法的运算量和性能分析及模拟的实验结果。 相似文献
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本文通过对ESPRIT算法的研究,提出了一种ESPRIT算法的演变算法,构造一种新的空间谱量,避免了对协方差矩阵进行特征分解的要求。理论分析与计算机仿真表明该算法切实可行、有效并且易于实现。 相似文献
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