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国家自然科学基金(11164008)

作品数:4 被引量:2H指数:1
相关作者:陈勇王芳叶志清更多>>
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基于约束相位解卷绕的正弦信号高精度相位估计被引量:1
2014年
在Tretter相位估计算法基础上,提出了一种基于约束相位解卷绕的相位估计方法。通过对观测相位进行适当的线性组合,将相位约束在较小的模糊相位集合之中,最后基于相位误差最小原则实现约束相位解卷绕。理论分析与Monte Carlo模拟结果显示,约束相位解卷绕的信噪比阈值低于常规解卷绕方法,且在高信噪比条件下相位估计均方根误差接近克拉美罗下限(CRLB),相位估计性能优于分段DFT相位差法以及全相位FFT测相法。在信噪比为5 dB、数据长度为1023的情况下,相位估计均方根误差约为0.9°。当信噪比为0 dB时,约束相位解卷绕的错误概率仅为10-3量级。
陈勇王芳叶志清
关键词:相位估计
一种快速高精度的改进Fitz频率估计算法被引量:1
2014年
针对Fitz频率估计算法频率估计方差在高信噪比情况下仍与克拉美劳下限存在着较大差距问题,提出了一种改进的Fitz频率估计算法.首先定义一种广义Kay窗函数加权的修正自相关函数,然后计算修正自相关函数相位的加权和,最终得到复正弦信号的频率估计值.仿真实验结果表明:当数据长度N=24,信噪比SNR=20 d B时,改进算法的频率估计方差降低了约2 d B,且改进算法的计算复杂度与Fitz算法相当.因此,改进算法在满足实时性要求的同时,取得了更高的频率估计精度.
王芳陈勇叶志清
关键词:频率估计自相关
The influence of strain on the microstructures of nanoparticles
The growth of nanoparticles embedded in a host matrix can lead to substantial strain.Strain and its spatial di...
Cailei Yuan~* Department of Physics,Jiangxi Normal University,Nanchang 330022,Jiangxi,P.R. China
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Influence of strain distribution on the morphology evolution of a Ge/GeO_2 core/shell nanoparticle confined in ultrathin Al_2O_3 thin film by surface oxidation
2015年
The influence of strain distribution on morphology evolution of Ge/GeO2 core/shell nanoparticle confined in ultrathin Al2O3 thin film by surface oxidation is investigated. A finite-element simulation is performed to simulate the morphology evolution of the confined Ge/GeO2 core/shell nanoparticle under the influence of the local strain distribution. It indicates that the resultant oxidation-related morphology of Ge/GeO2 core/shell nanoparticle confined in ultrathin film is strongly dependent on the local strain distribution. On the other hand, the strain gradients applied on the confined GeO2 shell can be modified by the formation of polycrystalline GeO2 shell, which has potential application in tailoring the microstructure and morphology evolution of the Ge/GeO2 core/shell nanoparticle.
章英黄红华刘晓山骆兴芳袁彩雷叶双莉
关键词:STRAIN
Strain distributions of confined Au/Ag and Ag/Au nanoparticles
2015年
The strain distributions of Au/Ag and Ag/Au nanoparticles confined in the Al2O3 matrix with different core sizes are investigated by using the finite element method, respectively. The simulation results clearly indicate that the compressive strains exerted on the Au/Ag and Ag/Au nanoparticles can he induced by the Al2O3 matrix. Moreover, it can be found that the strain gradient existing in a Au/Ag nanoparticle is much larger than that in a Ag/Au nanoparticle, which could be due to the larger Young's modu]us of An than that of Ag. With the core size increasing, the strain gradient existing in the Au/Ag nanoparficle becomes larger, while the strain gradient existing in the Ag/Au nanoparticle keeps constant. These different strain distributions may have significant influences on the structures and morphologies of the Au/Ag and Ag/Au nanoparticles, leading to the different physical properties for potential applications.
黄红华章英刘晓山骆兴芳袁彩雷叶双莉
关键词:STRAIN
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