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1.
朱圣棋  廖桂生  周争光 《电子学报》2009,37(12):2838-2844
 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   

2.
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   

3.
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   

4.
基于数据共轭重排的修正ESPRIT信号DOA估计算法   总被引:3,自引:0,他引:3  
本文介绍了将接收数据共轭重排的再利用,构造相关矩阵的修正ESPRIT算法.理论分析和仿真实验表明,该算法同经典的ESPRIT算法相比,在快拍次数有限时,可明显改善信号DOA估计的性能,且其计算量二者基本相当.  相似文献   

5.
ESPRIT     
  相似文献   

6.
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   

7.
Beamspace ESPRIT   总被引:9,自引:0,他引:9  
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   

8.
Multiresolution ESPRIT algorithm   总被引:4,自引:0,他引:4  
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   

9.
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   

10.
Multiple invariance ESPRIT   总被引:8,自引:0,他引:8  
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   

11.
12.
实值循环ESPRIT算法   总被引:2,自引:0,他引:2  
为了降低循环ESPRIT算法的计算复杂度,提出了一种实值循环ESPRIT算法,通过构造了循环自相关矩阵的数据模型,使其具有厄尔米特特性,将复数自相关矩阵映射成实值矩阵,通过实值分解降低了计算量,而且具有信号选择特性。由于空间平滑技术的引入,较好地解决了多径传播环境中信号高度相关问题。仿真实验结果证明,与循环ESPRIT算法相比,该算法适应多径传播环境,具有计算量小和性能好等特点。  相似文献   

13.
郑春弟  周祎  冯大政 《信号处理》2007,23(2):217-221
提出了一种类似ESPRIT的算法来估计波达方向(DOA)。对于等距线阵上的接收数据,此算法先用置换矩阵将其倒向,然后将原数据与倒向后的数据用欧拉公式和三角函数中的和差化积公式加以重新组合,从而形成虚拟阵列数据,在此基础上运用ESPRIT类算法估计波达方向。与U-ESPRIT算法相比较,新算法的不同之处在于:1)数据结构不同,并且其不再具有平移不变性;2)新算法中导向矩阵为实矩阵,因此旋转算符也不再是酉矩阵。仿真实验表明新算法在小样本、低信噪比下的性能优于传统ESPRIT算法。  相似文献   

14.
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   

15.
两种快速ESPRIT算法   总被引:4,自引:1,他引:4  
肖维民  彭应宁 《电子学报》1995,23(7):102-104
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   

16.
提出一种改进型的ESPRIT算法,对传统ESPRIT算法作以改进,提高了ESPRIT方法的性能,在小信噪比、多信号源的情况下提高了算法的测角精度.通过计算机仿真对改进算法的效果作了验证,验证了算法的有效性.  相似文献   

17.
《III》1993,6(4):16-19
The European ESPRIT research programme has now been running for nearly ten years and has many notable successes. Phil Yates investigates ESPRIT developments in the III–V semiconductor industry and wonders - where next?  相似文献   

18.
薛峰  高梅国 《信号处理》2002,18(5):464-467
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   

19.
二维虚拟ESPRIT算法   总被引:11,自引:0,他引:11  
刘全  魏急波  熊辉  雍玲 《信号处理》2001,17(3):247-251
本文通过构造出一特殊阵元阵列,提出了一种全新的二维ESPRIT算法--二维虚拟ESPRIT算法.它具有计算量极低、估计效果好、子阵列要求低等优点,并且通过采取一定措施,可以适用于各种情况,使得本文方法具有较强的灵活性和实用性.  相似文献   

20.
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