查询词典 covariance

The estimates of the absolute position and velocity of the vehicle in Local Inertial Cartesian Coordinate System are provided by Kalman filter and the data fusion algorithm called covariance matching method.

将滤波器所估测的相对位置和相对速度的资料，再转换至区域惯性直角座标系(Local Inertial Cartesian Coordinate System，简称LICCS)，并使用卡尔曼滤波为基础的共变异匹配法资料融合技术进行资料融合，以改善定位的精度。

The simulation result validates that the proposed method has higher accurateness and faster than that of unitary covariance similar measure matching method.

仿真结果证明该方法可比原有的归一化协方差相似性测度匹配方法具有更高的准确性与快速性。

In this paper, the adjoint system theory is applied to the guidance accuracy assess ment of the flying vehicle, and the covariance matrix of the impact point deviat ion is solved.

本文根据伴随系统理论，在某飞行器制导工具误差的精度评定中加以实际应用，求出落点偏差的协方差矩阵。

It is proved that the least squareestimators of linear estimable functions of regression coefficients areadmissible under matrix loss and minimax. The necessary and sufficientexistence conditions are derived for the uniformly minimum riskequivariant estimators of linear estimable functions ofregression coefficients under an affine group and a transitive group oftransformations respectively. It is also proved that there are no UMREestimators ofthe covariance matrix and variance under an affine groupof transformations and quadratic loss functions.

本文证明了回归系数的线性可估函数的最小二乘估计是极小极大的且在矩阵损失函数下是可容许的；还分别在仿射变换群和平移群下导出了存在回归系数的线性可估函数的一致最小风险同变估计的充要条件，并证明了在仿射变换和二次损失下不存在协方差阵和方差的 UMRE 估计。

To improve the precision of tree biomass parameter calculation, this paper explicates the principle, method and process to estimate the parameters of tree biomass by the nonlinear least square according to the formula of allometry method. It gives the formula to calculate the variance and covariance estimated parameters, and reveals the essence of logarithmic linearization regression of power function.

为了提高林木生物量参数的计算精度，根据林木相对生长公式，阐述用非线性最小二乘法求解生物量参数估值的原理、方法和过程；给出计算参数估值之方差与协方差的公式；揭示幂函数对数线性化回归的本质。

Analysis of covariance is a combination of regression analysis and variance analysis.

协方差分析足把直线回归与方差分析结合起来应用的一种方法。

On the foundation of standard UKF algorithm, the ratio of the theoretical value to the practical ones of the innovation's covariance was taken as the input of the FLAC to reduce the dependency of FLAC on the filter model, the generality of the fussy adaptive UKF algorithm was intensified; In the procedure of adjusting the measurement noise's covariance dynamically, the adjusted range could be amplified or minified to different extent by setting the exponential adjusting parameter, so the adjusting velocity and precision of the algorithm was controlled.

在标准的非线性UKF算法基础上，以残差的实际方差与理论方差的比值作为FLAC的输入，使FLAC对滤波模型的依赖性减弱，强化了模糊自适应UKF方法的通用性；在对量测噪声方差阵进行动态调节的过程中，通过设置指数调节参数可不同程度地放大或缩小调节的幅度，使算法的调节速度和精度得到控制。

In this paper a new method is proposed in order to suppress the coherent interference. First, utilizing the interpolate method, the real array can be virtually shifted under coherent interference, several covariance matrice are gererated after the virtual shifting. By averaging the previous results, a new covariance matrix is obtained. It is a full rank matrix.

提出一种新的相干波束形成方法，利用内插变换对相干背景下的真实阵列进行虚拟平移，得到多个虚拟平移后的信号协方差矩阵；对其进行平均后，所得到的相干信号协方差矩阵具有满秩性。

First, utilizing the interpolate method, the real array can be virtually shifted under coherent interference, several covariance matrice are gererated after the virtual shifting. By averaging the previous results, a new covariance matrix is obtained. It is a full rank matrix.

软件简介：提出一种新的相干波束形成方法，利用内插变换对相干背景下的真实阵列进行虚拟平移，得到多个虚拟平移后的信号协方差矩阵；对其进行平均后，所得到的相干信号协方差矩阵具有满秩性。

Model comparisons for estimating water and heat fluxes of reed wetland ecosystem in Panjin were done among Profile gradient method,Bowen ratio energy balance method and Eddy covariance method,based on the data from July 1 to July 31,2005 by open-path eddy covariance system(Li-7500,Li-cor Inc,USA) and the micro-climate gradient observation system.

利用2005年7月盘锦芦苇湿地生长旺季的小气候梯度系统30 min观测资料和开放式涡动相关系统10Hz原始观测资料，比较并分析了廓线法、波文比能量平衡法与涡动相关法计算的芦苇湿地生态系统水热通量。

Objective To investigate the effects of interleukin-1 β converting enzyme gene on the biologic characteristics of ovarian cancer cells.

目的 探讨白细胞介素-1 β转换酶的表达，对卵巢癌细胞生物学特性的影响。

Campylobacter: This illness is the most commonly identified cause of diarrheal illness in the world.

弯曲：这种病是最常见的原因查明腹泻病，在世界上。