共查询到19条相似文献,搜索用时 171 毫秒
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在介绍MUSIC算法的基础上,分析了信源数目估计误差对MUSIC算法测向性能的影响,针对信源数日过估计下出现虚假信号和欠估计下存在谱峰消失的问题,根据阵列协方差矩阵特征分解后噪声特征值非常接近的特点,提出了一种在未知信源数日情况下进行正确DOA估计的修正MUSIC算法,计算机仿真结果证明了该算法的可行性和有效性。 相似文献
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针对4D毫米波雷达中雷达孔径受限导致的角度分辨率不高的问题,提出一种改进的多重信号分类(Multiple Signal Classification,MUSIC)算法。首先通过数据预处理手段,补偿多输入输出(Multiple Input Multiple Output,MIMO)虚拟阵列中目标运动引起的相位误差;接着划分子阵并对角度维数据构成的协方差矩阵进行Toeplitz化处理,利用MUSIC算法估计一维角度;最后采用特征值排序的方法将估计出的俯仰角与方位角进行快速配对。该方法有效提高了4D毫米波雷达角度维估计的分辨率和估计精度,也提高了二维角度估计的计算速度。数值仿真与实物实验验证了所提方法在角度高分辨估计上的性能。 相似文献
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《计算机应用与软件》2017,(11)
针对传统解相干算法在低信噪比条件下不能有效分辨角度接近的信号源DOA的问题,提出一种基于空间平滑技术的特征空间多重信号分类MUSIC(Multiple Signal Classification)算法。首先用改进的空间平滑算法对相干信号进行预处理,然后对其应用特征空间MUSIC算法进行精确的DOA估计。计算机仿真结果表明,该算法的改进能更加有效地估计相隔较近的小信噪比信号源的DOA,分辨能力较强。 相似文献
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传统MUSIC测向算法直接用于二维DOA估计时,需要在参数空间中进行二维谱峰搜索,计算量很大.针对该问题,结合了马尔可夫蒙特卡罗(MCMC)方法与逐次搜索的方法,提出一种快速的MUSIC测向算法.该算法通过将MUSIC谱函数视为信号来向的概率密度函数,采用MCMC的Metropolis-Hastings抽样器对其进行采样,并利用;肖除空间相关性进行逐次搜索从而估计出各个信号的来向,能够在保持常规MUSIC算法性能的高分辨能力同时大大减少运算量.仿真结果表明了该算法的有效性. 相似文献
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一种数字图像盲增强的新算法 总被引:1,自引:0,他引:1
给出一种数字图像盲增强的新算法. 其中源数字图像及其灰度级未知, 已知的仅仅是被噪声污染了的图像. 该算法首先估计密度函数, 然后估计图像的灰度级, 最后去噪声重建图像, 达到图像增强的目的. 仿真例子说明了该算法的有效性. 相似文献
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在信号传播的速度与方向有关时,传统的MUSIC、ESPRIT算法和联合位置偏差DOA估计方法计算量太大,且估计精度下降,因此有必要改进算法提高精度。本文提出一种新型的迭代MUSIC优化方法,该方法精确度高,计算量没有增加,仿真试验证明该方法的有效性,正确性。 相似文献
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Compared to large-scale MIMO radar, coprime MIMO radar can achieve approximate estimation performance with reduced antenna number. In this paper, joint direction of arrival (DOA) estimation and array calibration for coprime multiple-input multiple-output (MIMO) radar is considered, and an iterative method for the estimations of DOA and array gain-phase errors is proposed. Based on the received data structure of coprime MIMO radar, trilinear decomposition is firstly adopted to obtain the estimations of transmit and receive direction matrices, which are perturbated by the gain-phase errors. Through equation transformation, the un-perturbated direction matrices and gain-phase errors can be iteratively updated based on Least squares (LS). Finally, the unique DOA estimation is determined from the intersection of transmit and receive direction matrices. The proposed algorithm achieves better DOA estimation and array calibration performance than other methods including estimation of signal parameters via rotational invariance techniques (ESPRIT)-like algorithm, multiple signal classification (MUSIC)-like algorithm and joint angle and array gain-phase error estimation (JAAGE) method, and it performs close to the method with ideal arrays. Multiple simulation results verify the algorithmic effectiveness of the proposed method. 相似文献
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Frequency diverse array (FDA) offers potential applications for joint range and angle estimation, but ambiguous estimates may be generated due to its range-angle coupling and time-variant beampattern. This problem can be addressed by jointly utilizing FDA and multiple-input multiple-output (MIMO) radar, but only multiple signal classification (MUSIC) algorithm was considered in the FDA literature. In order to avoid high computational complexity in the MUSIC algorithm due to the required 2-D peak searching, in this paper, we propose a two-stage estimating signal parameters via rotation invariance technique (ESPRIT) algorithm for FDA-MIMO radar to estimate both range and angle of targets, along with the proposed pairing method for unambiguous estimates. Moreover, closed-form expressions of the mean squared error (MSE) and Cramér-Rao lower bound (CRLB) for angle and range estimations are also derived. All proposed methods and derivations are verified by both theoretical analysis and numerical results, which show the superiority of FDA-MIMO radar over conventional phased-array radar and MIMO radar in target localization. 相似文献
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根据信道冲激响应的稀疏特性,提出了一种频域的时延估计压缩感知模型,将时延估计问题转化为基于欠采样数据的稀疏向量估计问题.利用离散傅里叶变换(Discrete Fourier transform,DFT)矩阵的子矩阵所满足的受限等距性(Restricted isometry property,RIP)以及信道冲激响应的稀疏特性充分降低了时延估计所需数据量的要求.分析了本文模型具有码片内多径分辨能力以及良好抗噪性能的原因,并与多信号分类(Multiple signal classification,MUSIC)和旋转不变技术的信号参数估计(Estimation of signal parameters via rotational invariance technique,ESPRIT)算法的时延估计性能进行仿真比较.仿真结果表明,本文提出的方法不需要预知多径的条数,对码片内多径时延具有较高的估计精度,其时延估计性能在特定条件下优于MUSIC和ESPRIT算法. 相似文献
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应答着陆系统是一种基于应答机的精密进近着陆引导系统,通过询问并接收飞机应答机的应答信号来估计飞机的方位、仰角和距离等信息;文章分析了应答着陆系统传统的测角算法原理、误差来源和影响因素;通过扩大不模糊角度测量的范围,利用虚拟技术实现了系统天线阵列的虚拟均匀排列;提出了基于MUSIC算法的空间平滑技术进行多目标飞机角度估计的设想;通过计算机仿真对新测角算法的估计能力,成功概率以及精度的分析,验证了新算法的可行性和有效性。 相似文献
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针对无线电通信领域中经常遇到多径传输和反射因素的现象,必须考虑宽带相干信号源的存在。提出一种离散多项式相位变换(DPT)与虚拟阵列变换法相结合的相干非线性调频(NLFM)信号的波达方向(DOA)估计方法,并对其中的算法做了对比、分析和改进。解决了常规MUSIC、ESPRIT算法不能估计宽带信号、相干信号的问题,不仅能更准确地进行DOA估计,而且不损失阵列的孔径,提高了阵元数的利用率。同时还提出了当两个信号源很近的情况下的角度估计算法。仿真实验证明了该算法的有效性。 相似文献
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This paper deals with direction-of-arrival (DOA) estimation based on iterative MUSIC searching technique for the code division multiple access (CDMA) system. It has been shown that the iterative searching technique suffers from the local maximum searching problem, causing acquisition errors in DOA estimation. In conjunction with a genetic algorithm (GA) for selecting initial search angle, we present an efficient approach to achieve the advantages of iterative DOA estimation with fast convergence and more accuracy estimate over existing conventional spectral searching methods. Finally, several computer simulation examples are provided for illustration and comparison. 相似文献