共查询到20条相似文献,搜索用时 46 毫秒
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本文利用在θ(ω)上的独立随机噪声列η_n(ω)+θ(ω)得到了当|η_n(ω)|小于δ时重构信号x(n)的一个新方法且利用这种新方法得到了恢复的x(n)与其真值的误差估计式,估计了满足这个误差估计式的概率下界。该方法收敛速度较快。 相似文献
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利用相位谱信息重构信号唯一性的研究 总被引:1,自引:0,他引:1
本文讨论了信号频域相位与零点的关系,着重研究了频域非重零点对信号重构唯一性的影响。证明了仅利用相位信息唯一重构原信号的充要条件,并进一步给出了仅用频域有限样本点处相位信息重构原信号的唯一性定理。 相似文献
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测量透明物体的相位是重构透明物体(如生物组织)三维形貌的基础,文章用显微镜物镜、压电陶瓷和CCD建立了一套测量微小透明物体相位的显微数字全息光路,对平面光场通过透明物体后相位被调制,经显微物镜后在像面上用CCD记录全息图时的光场分布,以及数字全息重构相位的过程与计算公式进行了推导,给出了相关的计算,同时讨论了全息图记录条件。 相似文献
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研究由相位谱重构有限长离散信号,即幅度补偿问题的收敛性。文章独立地以归一化相关系数对经典迭代法的收敛性进行了证明。通过该证明,可体会到经典迭代法之所以可进行信号重构的机理。 相似文献
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基于Kolmogoroff方法重构光纤光栅相位响应 总被引:5,自引:0,他引:5
借用信号处理的kolmogoroff方法,在最小相移的前提下,由光纤光栅的强度响应谱重构相位响应及冲激脉冲响应,由此确定时延、色散以及光纤光栅的某些结构特征。以均匀光纤光栅为例,证明该方法是行之有效的。 相似文献
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姜小磊 《信息技术与信息化》2009,(4):54-55,8
在重构滤波器给定的条件下,导出了最小平方意义下连续信号的最佳离散表示的傅里叶变换.为了更适应于某些应用,在推导时采用了有别于通常的内积定义,该内积诱导出的范数考虑了信号的变化速率.最佳离散表示可通过对连续信号依次进行模拟滤波、等间隔采样和数字滤波获得.此外,还把结果推广到二维信号的情形. 相似文献
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本文提出了利用双谱分析高速模数转换器(ADC)动态非线性的方法,指出双谱方法可以明显地减小量化噪声对谐波分析的影响,提出动态非线性测量的灵敏度和精度。计算机模拟测试结果表明,双谱法比功率法具有高的检测分辨率的抗噪声能力。 相似文献
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《Signal Processing, IEEE Transactions on》2008,56(9):4274-4285
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Estimation of transient signal in additive noise is very important in radar object detection and recognition. This paper presents a new method for transient signal reconstruction based on bispectrum estimation techniques. The third-order cumulants of the received noisy ultra-wide band echoes are acquired first and an ARMA model is then fitted. The bispectrum of the output signal of the ARMA model will be used to reconstruct the transient signal. Simulation results show that the effect is very good even in lower signal-to-noise (SNR) situation. 相似文献
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Block-Based Methods for the Reconstruction of Finite-Length Signals From Nonuniform Samples 总被引:2,自引:0,他引:2
T. Engin Tuncer 《Signal Processing, IEEE Transactions on》2007,55(2):530-541
Two novel block-based algorithms are presented for the reconstruction of uniform samples given the nonuniform samples. The first algorithm uses a sinc interpolator whereas the second one uses a DFT-based interpolator. It is shown that the proposed algorithms are stable and the error due to noise and sampling jitter is bounded by the corresponding error norms of noise and jitter, respectively. We show that both of the block-based algorithms provide nearly perfect reconstruction for a class of practically time and bandlimited signals. Boundary effects are considered and single and multiblock processing is discussed. A modified block-based algorithm is developed by using the windowing technique in order to improve the mean-squared error (MSE) performance for nonbandlimited signals. It is shown that this algorithm performs better than a group of alternative algorithms, including Yen's third algorithm, for a variety of signal, noise, and sampling grids 相似文献
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Alexander V. Totsky Dmitriy V. Fevralev Vladimir V. Lukin Vladimir Ya. Katkovnik Dmitriy V. Paliy Karen O. Egiazarian Oleksiy B. Pogrebnyak Jaakko T. Astola 《Circuits, Systems, and Signal Processing》2006,25(3):315-342
The problem of reconstructing a signal waveform when the observed realizations are corrupted by intensive noise and random
shifts is considered in this paper. Several ways of performing bispectrum filtering are proposed and investigated. First,
it is shown that the signal reconstruction is more efficient if one applies smoothing to the recovered real and imaginary
parts of the Fourier spectrum separately instead of filtering the magnitude and phase spectra recovered from a bispectrum
estimate. Second, several nonadaptive filters are studied, and it is demonstrated that the proper choice of the filter type
and its parameters is critical. Some adaptive filtering techniques based on the Z-parameter and on local polynomial approximation
(LPA)-intersection of confidence intervals (ICI) are discussed. The performances of nonadaptive and adaptive filtering techniques
in the bispectrum-based signal reconstruction are studied using the mean-squared error as the criterion. It is shown that
the use of LPA-ICI and other adaptive filters provides improvement of signal reconstruction in comparison to the conventional
bispectrum method and the combined bispectrum filtering methods proposed earlier for nonadaptive filters. The benefits achieved
are mainly observed for low (smaller than unity) signal-to-noise ratios. 相似文献
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基于旋转干涉仪模糊相位差的多假设NLS定位算法 总被引:1,自引:0,他引:1
针对传统长基线干涉仪(LBI)定位系统通常需要多个接收通道的缺点,该文提出了一种基于旋转LBI模糊相位差的定位新体制,最少只需两个接收通道即可实现快速、高精度、无模糊定位.针对相位差模糊导致的强非线性问题,提出了一种多假设非线性最小二乘定位算法,给出了算法的实现流程,从理论上分析了子区域宽度的选择依据.该算法计算量小、解定位模糊的能力强,定位精度能够达到克拉美罗下限(CRLB).计算机仿真实验验证了该文定位体制的可行性以及算法性能的优越性. 相似文献