共查询到20条相似文献,搜索用时 62 毫秒
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叶琼瑜袁书传曹旸张峰衔 《安全与电磁兼容》2016,(1):33-35
通过对天线增益、天线系数与天线方向图相关参数的公式推算及EMC场地确认测试考核实质的说明,定性地分析了天线方向图对两项场地确认指标——归一化场地衰减和场地电压驻波比的影响,并得出一些经验性的结论,作为理论分析及实际测试时理解和应用的辅助分析手段。 相似文献
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论述了用标准场法建立电场探头校准系统的方法,详细地介绍了标准增益天线的研制方案、近场增益计算方法.以及不确定度的评定步骤,重点研究了场地误差不确定度分量的评定过程。所给出的扩展不确定度的可信度较高。 相似文献
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针对明安图射电频谱日像仪(Mingantu spectral radioheliograph,MUSER)天线高指向精度动态跟踪要求,同时为降低非理想因素对复杂系统天线指向测量影响,提出校准天线指向的组合方法.先用网格法测量天线的双圆极化多频率通道立体方向图定性评估系统测量链路状态,后对太阳运行轨道进行十字跟踪扫描测量天线指向偏差,再用最小二乘法拟合获得天线指向模型的8个参数.国家天文台明安图观测基地的2台20 m地平式天线将在MUSER系统观测和校准中起重要作用.对20 m天线跟踪指向进行了校准,指向偏差均方根从12'改善到4.4',验证了方法的可行性,为类似复杂系统的相关工作提供了借鉴和参考. 相似文献
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The article describes a model representation of radar probing data in form of a mixture of background and target samples, which is the sum of two random variables with very different parameters. For model development we research the behavior of the central moments of the distribution mix without assuming the distribution law form. An example it is described the detection of the signal at the output of compression system of chirp ionosonde. 相似文献
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解决IP网QoS问题是目前通信领域的研究热点之一.虽然研究已经取得了一定的进展,但人们对于IP 网QoS本身的含义及相关的问题还有着不同的理解.本文将从IP网QoS的定义入手讨论相关的一些问题以及解决IP网QoS问题所做的各种努力. 相似文献
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《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1968,56(6):1024-1032
Assuming that visual responses are due to the action of particles on the membrane of the visual cells, the stochastic variability of the response should be a function of the number of particles producing it. Quantitative predictions can be made with the aid of a model proposed in previous articles. It is found that responses produced in visual cells of Limulus by absorption of a single photon have the stochastic properties which would be expected if the response to one photon were brought about by 25 particles. It is concluded from this that the processes leading to visual responses produce multiplication of particles. The effects of temperature and of metabolic poisons suggest that these processes are of chemical nature. 相似文献
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A. M. Emel’yanov 《Semiconductors》2010,44(9):1134-1139
A method for analyzing the luminescence spectra of semiconductors is suggested. The method is based on differentiation of
the spectra. The potentialities of the method are demonstrated for luminescence in the region of the fundamental absorption
edge of Si and SiGe alloy single crystals. The method is superior in accuracy to previously known luminescence methods of
determining the band gap of indirect-gap semiconductors and practically insensitive to different conditions of outputting
radiation from the sample. 相似文献
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“计算机组成原理”设计性实践教学模式研究 总被引:1,自引:0,他引:1
本文阐述了"计算机组成原理"设计性实验教学的重要性,对设计性实验教学的目的和基本特征进行了归纳,对"计算机组成原理"设计性实验教学的现状进行了调查,对存在的问题进行了较深入的分析;在此基础上.对组成原理设计性实验的教学模式进行了研究,对设计性实验的体系进行了初步设计,并对"计算机组成原理"设计性实验的实施方法进行了探讨. 相似文献