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A new high dynamic synchronization algorithm using cyclic spectral density was presented according to the theories of cyclic spectral density and its anti-interface and anti-noise properties.The closed forms of frequency error and phase error were obtained,and their performances were analyzed.The in-phase signal throw costas loop was normalized to obtain a cosine signal.Cyclic spectral density of the cosine signal of was computed to obtain the frequency error and the phase error and then results were put into NCO to synchronize.Finally,the performance of the presented algorithms was compared with the conventional algorithms by virtue of simulations,and the simulation results proved the correctness and the superiority of the new algorithms. 相似文献
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为了解决多通道投影显示系统中由于光线相互干扰而引起显示墙上图像画质下降的问题,提出了两种抗光线干扰算法。1.基于点对点的抗光线干扰算法:首先建立拍摄相机与投影机之间的亚像素级对应关系,然后依据该对应关系和实验测得的亮度饱和度增益表对输出图像进行亮度衰减和饱和度提升;2.基于图像增强的抗光线干扰算法:综合利用多种图像增强算法来提升图像画质,间接降低光线干扰。针对这两种算法,给出了算法的理论推导并以穹顶24通道投影显示系统为例,进行了实验验证。实验结果表明:两种抗光线干扰算法可有效降低光线干扰和提升图像画质。 相似文献
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n-ZnO/p-Si heterojunctions were grown by atomic layer deposition (ALD) on (100) p-Si substrates at different growth temperatures in the range of ~100–250 °C. The current-voltage characterization of all the heterojunctions showed typical rectifying behavior, a true signature of a p-n junction diode. The diode grown at 100 °C were having significantly lower reverse saturation current (~21 nA) and high rectification factor (~120) compared to those grown at relatively higher temperatures such as 200 or 250 °C. From capacitance-voltage measurements, it was found that the depletion width in the ZnO side of n-ZnO/p-Si diode was maximum (~60 nm) for the diode grown at 100 °C and decreased gradually to ~3 nm for the diodes grown at high temperatures of 250 °C. The electron concentration in ZnO films was found to increase significantly on increasing the growth temperature from ~100 to 250 °C. The junction capacitance also showed an increasing trend with increase in the growth temperature. The variation of diode parameters with growth temperature has been discussed in terms of carrier concentration in ZnO films and associated growth mechanisms of the ALD. Such low temperature grown n-ZnO/p-Si diodes with lower reverse saturation current and large depletion width may be suitable for photo detection applications. 相似文献
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通过分析传统事件树分析法在求解复杂系统可靠性时的不足,提出了一种基于二元决策图的事件树分析方法,主要讨论了各支点事件之间存在相关性的异常情况。二元决策图给出了故障树结构的二叉树的逻辑形式,用于描述系统失效的原因,并对系统顶事件进行分析。在对系统进行可靠性分析的过程中,由于不需要将最小割集和质蕴涵项作为中间步骤,从而提高了系统可靠性分析的效率和精度,为大型复杂系统的可靠性分析提供了一条新途径。 相似文献
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使用线性分组码用于构造M公钥体制本质上就是使用线性分组码构造M公钥体制的安全.研究了其它线性分组码用于构造M公钥体制的可行性;分析了M公钥体制中G、S、P是保密的,实现随机选取G、S、P成为了建立M公钥体制的关键;分析了满秩矩阵S和置换矩阵P的随机产生问题,并得到了一些重要结果;这些结果不仅对M公钥体制是适用的,而且对其它纠错码体制和方案也同样是有用的. 相似文献
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IP增值业务的不断发展和Internet的发展普及,产生了新的分布式应用系统。将业务处理与客户交互分开,实现瘦客户、业务服务、数据服务的多层分布式应用体系结构。论文对以交易中间件为基础框架的多层分布式体系技术进行了介绍,分析了多层分布式体系技术在电信IP业务中的应用,给出了相关体系流程和多层分布式体系事例。 相似文献