查询词典 SNR

Non-data-aided SNR estimation is considerer for M-PSK transmission over additive white Gaussian noise channels.

非数据辅助的信噪比估计被认为是对加性高斯白噪声信道下MPSK信号进行估计。

The eminent performance of this method is proved by its higher SNR(signal- to- noise rate), smaller MSE(Minimizes the mean squared error) The discal surface of the contaminated insulators is the interesting area of the research.

数值试验证明，与固定阈值法和极大极小阈值法比较，运用该方法去噪后的图像具有更高的信噪比和更小的最小均方误差。

To obtain precise result, itis necessary, in the aspect of hardware, to set up one stable optics system with highSNR, only if so, can we do the measurement with the steady NIR. To do so, we designthe optics system using AOTF, and take some measures to increase the light energyand the system SNR, which includes the three layers structure of the light chamber,the equipments to cover the useless light, polarizing to reduce the influence of 0 gradelight and focalize the light with lens. Apart from the hardware aspect, according to theexperiments, we can see that the different temperatures between at setting up themodels and at predicting the results will affect the prediction results in a way, and theaffection extent will be increased along with the increase of the temperaturedifference. Moreover, the light energy that can be detected will be different with thecontact pressure, and the match of the refractive indexes between the tissue and thesurroundings will enhance the light transmission depth, which will take moreinformation of the tissue. So, during the measurement, we should ensure the sametemperature between measuring and predicting, the same contact pressure at everymeasurement and the match of the indexes between the tissue and the surroundings aspossible as we can.

要提高测量精度，从硬件方面就必须有一个稳定的、信噪比较高的分光光路系统，以此得到稳定的近红外光来进行无创检测，针对这个目的，我们设计了 AOTF 分光光路系统，并在系统中采用一定的措施如三层灯室结构、遮光筒以减小杂散光、起偏和检偏来减小 0 级光影响、透镜汇聚等等来提高出射光的能量和系统的信噪比；从其他影响因素方面，通过实验，我们得到不同的建模温度对于预测结果有一定的影响，且影响随着温度的差值越大而越大，另外散反射光谱的能量也随着接触压力的不同而不同，组织的折射率与环境匹配将加大光的入射深度，从而能携带更多的组织信息，所以在测量时我们尽可能保证同一温度、保证同一接触压力以及利用物理或者化学的方法使组织与环境折射率匹配等。

Some methods to improve the system's output SNR by coherent or noncoherent operating are also discussed.

最后讨论了用相干或非相干处理来改善系统输出信噪比的方法。

The digital spectra and SNR of nonuniformly sampled signals is analyzed by utilizing Fourier transform technique.

利用付氏变换的分析方法对这类非均匀取样信号的数字谱结构及信噪比进行了分析。

In the end, the spectrum expression of nonuniformly sampled LFM signal in the fractional Fourier domain is derived, and the detection probability of the signal in the case of different SNR is studied.

最后，应用该方法得到了非均匀采样LFM信号在分数阶Fourier变换域的频谱表达式，并对不同信噪比条件下信号的检测概率进行了研究。

The basic iterative algorithm and the error spreading induced by the method were quantitively analyzed, and the certain relationship between the image spatial resolution and the image SNR was also presented.

在建立系统工作模型的基础上，对基本递推算法和由此引入的误差扩散效应进行了定量化分析，并初步给出图像信噪比和图像空间分辨率之间的量化关系。

The results of simulation experiments for single channel data or arbitrary channel of multi-channel data show the clearer event, the better wave shape and the higher SNR compared with the conventional convolution filter and common SVR based on RBF. So it is possible that SVR based on Ricker wavelet kernel function is applied to suppressing noise in seismic prospecting data.

对单道记录或多道记录中任选道的仿真实验表明，与传统的基于径向基核函数的支持向量回归及褶积滤波方法相比，使用本方法去噪后的同相轴更为清晰，波形恢复得更好，信噪比也较高，因此有可能将其应用于地震勘探记录的去噪处理中。

The ADC and SNR of centrum semiovale,cingulate gyrus,thalamus, genu and splenium of corpus callosum were calculated separately,and were compared on both conventional DWI and FLAIR-DWI.

结果：扣带回和胼胝体压部的ADC值在施加FLAIR脉冲后显著下降，而半卵圆区、丘脑及胼胝体膝部在施加FLAIR脉冲前后无明显变化；5个部位的DWI图像信噪比在施加FLAIR脉冲后均显著下降（P〈0.01）。

Simulation result shows that, compared to the two methods based on minimax theory and stein unbias similar estimate theory respectively, the SNR of the pulsar signal of the proposed algorithm is increased by 5 to 6 dB while keeping the details of it.

实验结果表明，与基于极大极小原理和Stein无偏似然原理的降噪方法相比，基于模糊阈值的小波降噪算法将脉冲信号的信噪比提高了大约5~6dB，同时可以保留信号的细节。

Apllied the data of QuickBird-2——the highest resolution remote sensing,and based on the theory and methodology of fractal geometry,we have quantitatively studied remote sensing lineations in Gaolong gold deposit of Guangxi.

采用Quick Brid-2高分辨率卫星遥感数据，通过分形几何学的盒计维数法，定量研究广西高龙金矿区遥感线性构造。

So, sometimes, to change the color can not be your food (referring to the above-mentioned crustacean) has been a sign of boiling over.

所以，有时，来改变颜色，不能你的食物一直是沸腾了的迹象。