讨论了带宽和温度以后，决定系统噪声的另一个因素就是等效源电阻。
After the bandwidth and temperature, the remaining factor in determining the system noise is the effective source resistance.
测量的信号通常是振动、噪声、温度、压力、电流、电压等信号中的一种或几种。
Measurement of the signal is usually vibration and noise, temperature, pressure, current, voltage, etc to one or more of the signal.
混频器的变频损耗和噪声温度的测量可以用改变中频部分的噪声温度使接收机的系统噪声温度变化来加以确定。
The conversion loss and noise temperature of mixers is determined by changing the IF noise temperature so as to change the noise temperature of the receiver system.
降低源电阻的温度、减小测量的带宽可以降低约翰逊噪声。
Johnson noise may be reduced by lowering the temperature of the source resistance and by decreasing the bandwidth of the measurement.
讨论了一种利用噪声测量的方法来确定毫米波段混频器的变频损耗和噪声温度的一个实例。
An example for measuring the conversion loss and noise temperature of mixers in millimeter wave band by using the noise measurement method is discussed in this paper.
将样品从室温温度(290k)降低到液氮的温度(77k)，可以使得噪声电压减小大约一半。
Cooling the sample from room temperature (290k) to liquid nitrogen temperature (77k) decreases the voltage noise by approximately a factor of two.
由于航空发动机转速高，空气流量大，排气温度高，试车时产生的强烈噪声形成大范围的环境污染；
Aerogine has the features of high rev, heavy air flux and high exhaust temperature, fierceness of noise engenders environment pollution largely during aeroengine test.
石英称重传感器的输出信号中的温度漂移噪声是一阶或一阶以上连续的，而称重激励信号的变化是离散的。
In the output signals of quartz weighing sensor, the temperature drift noise is first order or over first order continuous, however, the weighing exciting signal is discrete.
在流动vlbi的观测试验中，天线系统噪声温度和天线效率是观测前系统调试和检测的两项重要内容。
Antenna system noise temperature and antenna efficiency are the most important items in the system debugging and checking before the VLBI observation.
上述公式给出了降低约翰逊噪声的几种方法，即可以减小带宽、降低源的温度或者降低源电阻。
The previous equations suggest several means for reducing Johnson noise. It might be possible to reduce the bandwidth, the source temperature, or the source resistance.
从超宽带雷达天线、UHF/VHF波段接收机噪声温度以及最小可检测的信噪比三个方面研究了超宽带合成孔径雷达方程。
Three subjects-UWB radar antenna, UHF/VHF band receiver noise temperature, and the target detection from background, which are main factors in UWB SAR range equation, are studied.
这种SIS混频接收机性能可靠，且可用闭合循环氦制冷机冷却，在4.3K温度操作即可达到好的噪声性能。
This SIS mixer receiver is reliable, and can achieve good noise performance even operated at 4.3k temperature with a close cycle helium refrigerator.
采用由高低压力保护的压缩机组，具有自我监测的压缩机起闭控制程序，噪声小，寿命长，温度波动小。
With both high pressure and low pressure protection and compressor, self-checking compressor on and off controlling program, ensuring low noise, long duration and little temperature fluctuation.
针对如何大幅度降低排气温度并兼顾防治海水倒灌和削减排气噪声，本文提出了一种水喷淋消声器设计方案。
In view of the factors that how to reduce significantly the exhaust temperature, prevent water pour backward and reduce the exhaust noise, the present theses presented a water spraying silencer.
卫星热红外温度异常点是天线附近背景噪声与地球信息随机共振的结果。
Satellite thermal infrared anomalous points of temperature are the result of stochastic resonance of background noises and earth information near the antenna.
在提出日凌干扰处理新模型的基础上，根据太阳视面与天线主瓣半功率点截面的相对运动关系，系统阐述了日凌时天线噪声温度的分析方法。
A new model of dealing with solar radiating disturbance is put forward and a systematic explanation to the antenna noise temperature analysis in case of solar radiating disturbance is made.
应用振弦式传感器并基于脉冲计数法进行压力测量可达测量精度受脉冲计数精度、电路噪声及温度补偿等多重因素影响。
When using pulse counting method, the precision of pressure-measuring with vibrating-wire sensor is influenced by the precision of pulse counter, circuit noise, temperature compensation, etc.
温度系数小、精度高、噪声低、高频性能好。
Low temperature coefficient, high precision, low noise, and good high frequency performance.
随着工作温度的升高，器件内部噪声对器件性能的影响越来越大。
With the development of operation temperature, intrinsic noise of the device has a much stronger effect on its performance.
等效噪声温度高达数十万度的A/D模块，引起了数字接收机性能的深刻变化。
The performance of a digital receiver will be changed significantly when the equivalent noise temperature of the A/D module rises to hundred thousands degrees.
论文设计的装置主要完成对电机三相电压电流等电参数的测量、计算和分析，而不涉及对电机的机械特性、温度、噪声、磁场等测量。
This instrument is designed to measure, compute and analyse the triphase voltages and currents, without mechanical characteristic, temperature, noise and magnetic field etc.
设计了一种基于LED光源的荧光温度检测系统，给出了各个环节的传递模型和噪声模型。
A temperature measuring system based on LED light source is designed, and the transfer model and noisy model of every section is given.
此换热器空气阻力大，空气预热温度不高，风机压头高，环境噪声大，风机振动大、易损坏。
The recuperators have high air resistance , low air preheating temperature and high fan pressure head , and fan has much noise to environment and are apt to break down with vibration .
通过对电压源传统设计中关于速度、噪声、工作温度范围方面的研究，设计了一种带隙基准电压源。
We have provided improvements on speed, noise, temperature operating range issues compared with traditional bandgap reference design.
通过制冷可以很大程度上降低接收机的噪声温度，从而提高接收机的灵敏度。
Through the refrigeration, we can greatly reduce the noise temperature of the receiver, so as to improve the sensitivity of the receiver.
它测量范围广，能自动采集流量、压力、温度、功率、噪声等参数，测量参数直接输入微机获得精确的数据、图表、曲线。
Its wide range, the acquisition automatically flow, pressure, temperature, power, noise, and other parameters, measuring parameters entered into the computer to obtain accurate data, charts, curves.
还进行了温度和流量对辐射噪声影响的研究。
The effects of the eradiating noise on account of the temperature and rate of flow are also studied.
文章研究了噪声、温度、湿度及照明对人体工效的影响。
The effects of noise, heat, humidity and lighting on human performance were investigated.
本文介绍了微波辐射计接收机逆向辐射噪声温度的计算方法，同时也给出了降低这种逆向辐射噪声温度的两种方法。
This paper presents a way of inverse-direction radiating noise temperature calculation in microwave radiometer receiver. And two methods are given to reduce the radiating noise.
根据结晶器信号和干扰的不同特性，按照自适应噪声抵消原理，给出了一个新的自适应噪声抵消器结构对温度数据进行了处理。
Based on the different characters between the temperature signal and noise, a new adaptive noise canceller structure is given to dispose the temperature data by the adaptive noise cancellation theory.
应用推荐