Design and Implementation of Radar Receiver Noise Coefficient Auto-measuring 雷达接收机自动化噪声系数测试方法与实现
This machine has many advantages, such as constant operation, low noise, high loading coefficient and short mixing time etc. 该机还具有运转平稳、噪音低、装载系数高、混合时间短等优点。
The result indicates that the board has excellent absorbing properties. Noise Reduction Coefficient is around 0.80~ 1.10. 结果表明,该板具有优异的吸声性能,降噪系数约为0.80 ̄1.10。
As for nonwhite noise problem of reflection coefficient, we may employ logarithmic power spectrum to estimate the autocorrelation function of seismic wavelet, then obtain seismic wavelet and deconvolution operator. 对于反射系数非白噪声问题,本文提出利用对数功率谱来估算地震子波的自相关函数进而求取地震子波以及反褶积算子的方法;
Many methods of noise reduction can influence coefficient of performance ( COP) of compressors, and improving efficiency maybe cause noise increase or transformation of frequency spectrum. 多数的降噪方法会影响COP,而节能的改进又会引起噪声的提高或频谱的改变。
It has characteristics of smaller required memory capacity, smaller noise coefficient and better numerical value stability. 它具有所需存贮量小、噪声传递系数小及数值稳定性好等特点。
The expressions show that the average brightness temperature of antenna aperture relates with three factors: coefficient of useful area for antenna, noise temperature of noise sources and reflective coefficient of noise sources. 该式表明,无耗天线口面的平均亮温度仅与三个因素有关:噪声源的噪声温度,噪声源的反射系数和天线的面积利用系数。
The escape rate of the bistable sawtooth system driven by correlated white noises in the different cases of multiplicative noise coefficient is calculated accurately. 在不同乘法噪声系数情况下,计算了关联噪声驱动的双稳锯齿系统的逃逸率。
The Influence of Multiplicative Noise Coefficient on the Escape Rate in the Bistable Sawtooth System 乘法噪声系数对双稳锯齿系统逃逸率的影响
Radiometer parameters, such as radiometer's linearity, noise coefficient, system anti-interference ability, integrating time constant, are discussed and measured. 讨论了辐射计的线性度、噪声系数、积分时间、系统抗干扰性等性能参数的测量方法,对测量结果进行了深入分析;
The noise reduction coefficient of the material is 0.6, and the sound absorption property at middle-low fre-quency is good. 材料的降噪系数达0.6,中低频吸声性能较佳。
Excess noise coefficient is 7 and both rise and fall time were less than 1 ns. 过剩噪声系数为7;上升、下降时间短于1ns。
The methods to fit gain curve of fiber and to get noise coefficient are also proposed. 还介绍拟合光纤的喇曼增益系数曲线和求出噪声系数的方法。
In the paper, the source and sorting of noise in microwave communication receiving system is described; and noise coefficient and network noiseness are analysised in detail. 本文全面论述了微波通信接收系统的噪声来源和分类,并较详细地分析了噪声系数及网络的噪声特性。
The second step is to estimate the noise level of the high-frequency coefficient on different scales, then set threshold value and modify wavelet coefficient using threshold value method. 然后估计不同尺度上高频系数的噪声水平,设置阈值,并利用阈值法来修改小波系数;
By the rule of ignorable feed-back within a mixer transistor, a new kind of algorithm of a mixer noise coefficient is suggested. 依据管子内部反馈作用可以不考虑的特点,提出了混频器噪声系数的新算法。
It is assumed that random signals consist of white noise signal and non white noise signal. Non white noise coefficient is brought forward. 假定任意随机激励信号由白噪声与非白噪声信号组成,由此导出线性结构响应之间的相关函数由两部分组成,一部分与脉冲响应具有相同的数学形式,另一部分为其它形式。
Taking advantage of ( Advance Design System) ADS, one of the most powerful radio-frequency simulation tools, we mean to simulate and design lower-noise-amplifier ( LNA) for lowest noise coefficient and maximum gain as preparation for systematic simulation. 用目前最流行的射频仿真工具之一ADS对低噪声放大器进行仿真和设计,实现LNA的最小噪声系数和最大增益,同时为系统仿真奠定基础。
The criterions of high frequency noise, background noise and reduce coefficient were presented. 导出了原子光谱高频噪声判据,背景噪声、压缩系数关系判据;
Emphatically Improving circuit steady degree and linear degree 、 reducing noise coefficient and improving characteristic of input and output is analysed and researched. 着重对提高电路稳定度和线性度、降低噪声系数和改善输入输出特性进行了分析研究。
The capacitive micro-accelerometer has been commonly used due to their high accuracy, low drift, low power dissipation, low noise, low temperature coefficient and high sensitivity characteristics. 微电容式加速度计因具有精度高、噪声特性好、漂移低、温度敏感性小、功耗低等优点而得到广泛应用。
The results show that when the land water load deformation is larger than GPS noise, the correction coefficient is larger. 结果表明,当陆地水迁徙负荷形变量大于GPS观测噪声时,改正效果明显。
Since the expanding of the frequency bandwidth is mainly within the effective one, the main energy spiking deconvolution can usually produce a satisfied result by taking a very small white noise coefficient even in the case that more serious noises exit in the seismic record. 由于主能量反褶积主要是在地震波的有效频带范围内拓宽频谱,因此即使在噪音比较严重的的情况下仍可取很小的白噪系数而获得较好的反褶积效果。
The experiment results showed that when X-ray television system based on this method is regulated noise reduction coefficient, the effects of noise reduction, as well as movement of the tail of the image did not generate the feeling of transition. 实验结果表明,采用本方法实现的X线电视系统,在降噪系数调节时,图像的降噪效果以及运动拖尾的变化都没有跳变的感觉。
The thesis has used two-dimensional discrete wavelet transform to process the image of radar and discard noise for wavelet coefficient. 本文利用二维离散小波变换在图像增强方面的优点,对雷达回波信号进行处理。并对小波分解后各个方向的小波系数进行去噪和增强。
This paper realized these two use, and conclusions could got by analyzing the time deviation, frequency deviation, frequency drift, Allan deviation and the noise coefficient. All these conclusions have proved that Kalman algorithm can achieve better results in these two ways. 论文实现了这两类运用,通过对滤波后时差、频差、频漂、Allan偏差以及噪声系数的分析,得出结论,证明Kalman滤波算法在这两类运用中都能取得较理想的结果。
The efficiency of information transmission can be improved by these kinds of noise and correlation coefficient ratio does exceed unity in the situation under study. 两种噪声都能改善信息传递效率,使得互相关系数比大于一。
The input stage of the first-stage amplifier is designed according to the minimum noise coefficient matching, and the output stage is designed according to the maximum gain matching. 第一级放大器的输入级按照最小噪声系数匹配进行设计,输出按最大增益匹配进行设计。