查询词典 lag covariance

Because of the computation load and the implementation complexity of full rank STAP are too great to be accepted and it is really very difficult to obtain enough samples to estimate the covariance matrix.

最初提出的是使用全部空域和时域进行处理的全时空的最优算法的计算量和实现的复杂度令人们难以接受，并且难以获得估计协方差矩阵所需的足够的样本数，后来的研究重点就转移到了降维处理算法上。

The performance of a disturbance covariance matrix is degradated in space time adaptive processing when it is estimated with secondary data contaminated by targetlike signals.

针对空时自适应处理中样本协方差矩阵受干扰目标污染时检测性能下降的问题，提出了一种基于知识的空时自适应处理（knowledge aided space time adaptive processing， KASTAP）方法。

To reach the aim, this paper designs a group of proper evaluation criterions on the basis of the qualitative and quantitative criterions, which is on the basis of visual interpretation, adopting average gradient and wavelet energy for analyzing the space resolution difference between fusion image and original undegraded multi-spectral image, adopting standard variance, standard deviation and covariance matrix determinant value for analyzing the difference of information between fusion image and original undegraded multi-spectral image, adopting mean, median and normalization least variance for analyzing the maintenance degree of spectrum information.

将待融合图像降解到原来分辨率的一半，用现有的一些融合算法进行融合实验，并用定性和定量评价方法对融合图像进行质量评价，得到10种较好的融合方法。

Unlike the uniform linear array,the unform circular array is able to provide 360°azimuthal coverage,within the mode space,it has the covariance matrix of the Toeplitz-like struture while all sources are uncorrelated,with which the noise variance can be made out directly,note that will eliminate an eigendecomposition when the ESPRIT is applied,consequently reduce the computational load.

对于均匀圆形阵列，在信源都是非相干信源的情形下，由于模式变换后的协方差矩阵具有类Toeplitz的特征，因此，我们可以根据这种特殊的性质，直接求得噪声分量，因此若使用ESPRIT算法进行波达方向估计，就可以避免第一次特征分解，较大程度上减少了计算量。

Another way infixing R2 into the M-V model results in violating the restriction of the M-V models, which the covariance matrix must be positive definite matrix, and then leads the performance of the portfolio to be worse eventually.

而另一种方式权重配置方式，将R2嵌入M-V模型方式所得出的结果，则违反了M-V模型的限制条件之一，即所变化后的共变异矩阵违反了正定的限制，最后使得投组的绩效变差。

Based on the scatted data , a suitable method has been proposed in this paper , in which the least eigenvector of covariance matrix for the local data points is used as the normal vector of the data .

这里针对散乱测量数据点云，以局部数据点协方差矩的最小特征向量作为数据点的方向矢量，并根据实际测量情况，对基于二次曲面拟合的数据点曲率估算算法进行了改进。

The data was analyzed by chi-square,stepwise regression analysis and covariance statistics.

资料用卡方检验、逐步回归和协方差分析等。

Based on the measurement of carbon flux by the methods of eddy covariance and static chamber/gas chromatogram, a comparison was made between the two methods in evaluating ecosystem respiration over winter wheat-summer maize double cropland and Kobresia humilis alpine meadow.

基于涡度相关法和静态箱／气相色谱法的碳通量观测数据，对比分析了两种方法在评价禹城冬小麦－夏玉米复种农田生态系统和海北高寒矮嵩草草甸生态系统呼吸中的差异。

Our model is suited to the statisticalanalysis of covariance and could potentially be used to comparethe effects of covariants on labor pain and the rate of changeof pain.

该模型适用於统计分析影响因素的协方差，并可用於比较各影响因素对产痛及其变化的影响。

Second,normals and curvatures of vertices in the optimal neighborhood are estimated by covariance matrix analysis.

实验结果表明，多边滤波器在有效地去除噪声的同时，还能较好地保持点模型表面的几何特征。

Methods Clinical data of 3 cases of bile duct injury during laparoscopic cholecystectomy were analyzed retrospectively.

回顾总结3例LC术中胆管损伤的临床资料，分析3例胆管损伤的原因及对策。

These techniques are applied to the gobang.

本文将这些技术用于五子棋中。