查询词典 correlation analysis

To solv e this problem, a circular correlation method based on FFT for C/A code acquisition was discussed. To improve SNR in weak signal environments, this text put forward a modified acquisition by circular correlation. The analysis and simu lations indicate that the method can make the perˉ formance of acquisition in low SNR improved and verify its validit y.

针对弱信号环境下低信噪比的情况，研究了适合该算法的解决方案，并提出改进的捕获算法，理论分析与实验结果证实了该方法在弱信号环境下具有较好的捕获性能，并能大幅度减少捕获时间。

The theoretic formulas for cross correlation analysis were derived. 2. According to the frozen model, a transit model and expression formula of flow noise were got. Parameter estimation algorithm was applied in calculating of cross correlation function.

根据凝固模型，建立了流动噪声信号的传递模型，推导出凝固模型时的传递函数的表达式；对两种流动模型情况下，流动噪声的传递进行理论和仿真研究，仿真表明，尽管参数估计法可以消除传感器的涂污现象，但计算量大，速度慢，不能满足实时测量的要求。

Ultrasonic measurement method is a new one. It has many advantages, such as, not changing the profile of the flow and characters of the fluid, non-invasion, no pressure losing and can work under the severe conditions. Collecting the flow noise signals at the upstream and downstream of the pipe, adopting the cross correlation method to analysis signals, calculating the cross correlation function and finding the peak of it, then we can get the transit time.

超声波流量测量具有不改变流动状态与性质、非接触、耐恶劣环境等优点，通过对所采集的上、下游流动噪声信号进行相关分析，其互相关函数的峰值位置所对应的时间，为流体流过上、下游传感器之间的距离所用时间，进而计算出流速和流量。

The optimal collocated positions of secondary source with two microphones are studied and the separate of transfer function method that reduce the influence of acoustic feedback are developed based on plane wave transmission theory of sound and concept of transfer function in a duct. After, In order to identify the variation of the signals and find out individual correlation coefficient, cross correlation function analysis between primary noise signal and reference input signal is processed.

本文根据管道声场的平面波传递理论，进行第二声源与两个感测麦克风之间的位置配置研究，配合数位讯号处理的技术，发展出转移函数分离法，以消除声场回授的影响，之后，再将使用和未使用转移函数分离法的讯号个别与主要噪音源讯号做交互相关函数的运算处理，辨识讯号之间的差异，找出个别的相关性系数。

Using symmetrical component method, the correlation analysis on calculated results of cross correlation coefficient of on-site collected noise is performed and the conclusion is obtained: the interphase noise of three-phase power transmission line is relevant a certain extent.

首先介绍了中压电力线信道噪声通用模型，对现场采集的噪声进行互相关系数计算，并采用对称分量法进行相关性分析，得出三相电力系统相间噪声具有一定相关性的结论。

When applying random field theory to reliability analysis, one of the most important problems is how to consider the auto correlation and cross correlation of the shear strength of soils.

在利用随机场理论进行土工可靠度计算时，关键问题之一在于如何考虑土的抗剪强度指标的自相关性及互相关性。

Methods 302 cases were investigated using Functional Living Index Cancer Scale,the canonical correlation,correlation and stepwise regression were used in the analysis.

采用癌症病人生活功能指数量表对 3 0 2例现患大肠癌患者进行生命质量的流行病学调查，对所得资料进行因子分析、相关和逐步回归分析。

The expression of CD44V6、MMP-2、MMP-9、TIMP-1、TIMP-2 had a striking positive correlation with the heteromorphism in cells and tissue of AH using Spearman correlation analysis .

对不典型增生组中该五指标的阳性表达进行Spearman相关性分析，它们的阳性表达强度之间存在正相关。

Correlation analysis showed significantly negative correlation between forgiving and hurtfulness, revenge motivations, rumination , and between revenging and tendency to forgive, empathy

宽恕行为和受伤害感、报复倾向、沉思程度显著负相关，同移情程度显著正相关

The correlation between BMD and age, medical history, menopause duration, BMI, FBG, HbAlc, was analysed student's t test, analysis of variance and coefficient of multiple correlation were used. Results\ BMD decreased in all 80 patients with type 2 DM, of whom 36 (45%) were diagnosed as having OP.

本研究对 80例糖尿病患者骨密度进行了检测，并对其与年龄、病程、体重指数、绝经年限、空腹血糖、糖基化血红蛋白及部分钙磷调节激素的相关性进行了分析，结果报道如下。

A carrier gas such as nitrogen is directed through line 20 and valve 22 to connect with line 26 and mix with the gas sample.

如氮气之类的载体通过管线20和阀22引入，与管线26相通，与气体样品混合。

But for the most part, knaves and parasites had the command of his fortune

然而支配他的家产的大多是恶棍和寄生虫。