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excess noise ratio
相关语句
  超噪比
     The system provides two major functions including measuring noise temperature of low noise devices and calibrating the Excess Noise Ratio(ENR) of solid-state noise sources.
     该系统主要完成两大类功能:测试低噪声器件的噪声温度和校准固态噪声源的超噪比
短句来源
  “excess noise ratio”译为未确定词的双语例句
     This noise source can give a standard noise with an excess noise ratio up to & db. , the maxium possible error being ±0.2 db. .
     表明这种噪声源可给出超额噪声比达8分贝的标准噪 声,误差不大于±0.23分贝。
短句来源
     The excess noise ratio obtained by calibrating a S-band neon-filled noise the is 18. 58 db. , with a maxium posible error ±0.4 db. .
     讨论了校准方法,给出 了一种较好的方案,对s波段充氖管校准所得超额噪声比为18.58db,误差不大于 ±0.4 db。
短句来源
  相似匹配句对
     Noise
     噪声的危害与控制
短句来源
     NOISE
     噪音
短句来源
     Bounded Rationality, Noise Trading and Excess Volatility
     有限理性、噪音交易与过度波动
短句来源
     Substitution Method of Measuring the Excess Noise of Avalanche Photodiodes
     雪崩光电二极管噪声测试的替代法
短句来源
     While there are few noise traders, such institute will increase the degree of excess volatility.
     当市场投资者构成中噪音交易者比例很小的情况下,涨跌幅限制制度反而将增加过度波动程度。
短句来源
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In this paper a microwave standard noise source which produces noise by healing a metal filament is described. Its design and the measurement of effective noise tem- perature are discussed in detail. A new method for estimating the effect of losses of glass envelope and tuning elements on-the effective noise temperature is presented. The effect of the cold end of the hot filament is also quantitatively corrected. The results of the experiments and the error analysis are given. This noise source can give a standard...

In this paper a microwave standard noise source which produces noise by healing a metal filament is described. Its design and the measurement of effective noise tem- perature are discussed in detail. A new method for estimating the effect of losses of glass envelope and tuning elements on-the effective noise temperature is presented. The effect of the cold end of the hot filament is also quantitatively corrected. The results of the experiments and the error analysis are given. This noise source can give a standard noise with an excess noise ratio up to & db., the maxium possible error being ±0.2 db... Neon-filled. gareous discharge noise tubes are calibrated by using this hot filament stand4rd noise source A new calibrating method is given. The excess noise ratio obtained by calibrating a S-band neon-filled noise the is 18. 58 db., with a maxium posible error ±0.4 db..

本文介绍了一种用加热金属丝来产生噪声的微波标准噪声源。对其设计与有效噪声 温度的量测进行了较详细的讨论。提出了一种量测玻壳和调谐元件损耗对有效噪声温度 影响的方法。对热丝冷端的影响进行了定量修正。 给出了实验结果和误差分析。表明这种噪声源可给出超额噪声比达8分贝的标准噪 声,误差不大于±0.23分贝。 用这热丝式标准噪声源对充氮气体放电噪声管进行了校准。讨论了校准方法,给出 了一种较好的方案,对s波段充氖管校准所得超额噪声比为18.58db,误差不大于 ±0.4 db。

A thermal standard noise, gas discharge noise generators and a calibrating radiometer for 4mm band are discussed. Advantages and weak points of both the total-power and Dicke radiometers are evaluated. A calibrating system of total-power radiometer with IF attenuator has been set up, and its equalization and error equations are derived and analysed in this paper. An advantage of this system is that it can be used in all frequency bands. Furthermore, it uses fewer waveguide components, and the microwave...

A thermal standard noise, gas discharge noise generators and a calibrating radiometer for 4mm band are discussed. Advantages and weak points of both the total-power and Dicke radiometers are evaluated. A calibrating system of total-power radiometer with IF attenuator has been set up, and its equalization and error equations are derived and analysed in this paper. An advantage of this system is that it can be used in all frequency bands. Furthermore, it uses fewer waveguide components, and the microwave precision attenuator can be substituted by a precision IF attenuator. This is of practical significance for millimeter and submillimeter bands. This system, when used to calibrate gas discharge noise generators, gives an excess-noise ratio of 16.2 dB, the total error being ±0.45 dB. If the accuracy of the IF attenuator is 0.02 dB, the total crror will be ±0.3 dB.

本文论述了4mm波段热噪声标准、气体放电嗓声源以及定标辐射计,讨论了全功率辐射计与Dicke辐射计的优缺点,建立了中频衰减全功率辐射计的定标系统,并对系统的平衡方程及误差方程进行了推导和分析。

An automated noise test system is introduced.The system provides two major functions including measuring noise temperature of low noise devices and calibrating the Excess Noise Ratio(ENR) of solid-state noise sources.Concurrently it provides some other functions such as testing voltage standing wave ratio(VSWR) and measuring noise figure for electronic components/devices and receivers.The software of the system is used to control instruments setting and testing flow,compute...

An automated noise test system is introduced.The system provides two major functions including measuring noise temperature of low noise devices and calibrating the Excess Noise Ratio(ENR) of solid-state noise sources.Concurrently it provides some other functions such as testing voltage standing wave ratio(VSWR) and measuring noise figure for electronic components/devices and receivers.The software of the system is used to control instruments setting and testing flow,compute and compensate insertion loss,compute and correct mismatch effect,and generate automatically original records and certificates/reports in standard format including data curves.It is the test system that is automated,coaxial,and wideband and has all radio noise parameter test and calibration functions.

本文介绍一个噪声自动测试系统。该系统主要完成两大类功能:测试低噪声器件的噪声温度和校准固态噪声源的超噪比。同时兼有测量被测件的电压驻波比和测量电子部件/器件及接收机的噪声系数等功能。测试/校准软件用于控制仪器的设置和测试流程;计算和补偿插入损耗;计算和修正失配影响;自动生成标准格式的原始记录和证书报告(包括曲线)。该系统为同轴、宽频段、全面开展无线电噪声参数测试/校准的自动测试系统。

 
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