参数估计

A new non-linear quadratic programming Bayesian prestack three-terms inversion method is developed; Firstly, this method is based on Bayesian parameter estimation theory, Gaussian distribution is used for likelihood function and modified Cauchy distribution is used for prior distribution; Secondly, covariance matrix is used to describe the degree of correlation between the parameters; rock physics relations are used to constrain the inversion results; at last, this method is transformed into non-linear quadratic programming problem, and inversion results are acquired under several constraints.

本文提出了一种基于非线性二次规划的叠前三参数反演方法。首先基于贝叶斯参数估计理论，假设似然函数服从高斯分布，并使待反演的参数服从于改进的Cauchy分布，从而提高了反演结果的分辨率；其次用协方差矩阵来描述参数间的相关程度，进一步提高了反演结果的稳定性；最后将问题转化为一个非线性二次规划的求解问题，并在多种约束下得到问题的解。

The simple, agonic and highly accurate least square method is used to estimate the model′s parameters.

模型参数估计使用了方法简单、参数估计无偏、精度高的最小二乘法。

The simple, agonic and highly accurate least square method was used to estimate the model's parameters.

模型参数估计使用了方法简单、参数估计无偏、精度高的最小二乘法。

A motion parameter estimation method by fitting the phase history of the moving target is proposed for airborne dualchannel SAR systems. The crosstrack velocity, alongtrack velocity, crosstrack acceleration and alongtrack acceleration can be estimated, respectively.

针对机载双通道合成孔径雷达(synthetic aperture radar， SAR)系统中运动目标参数估计，提出了一种利用目标相位历程拟合目标运动参数的方法，包括距离向速度、方位向速度、距离向加速度和方位向加速度估计。

After the analysis of the difficulties of force tracking in impedance control, the advantages and disadvantages of off-line parameter estimate algorithm, on-line parameter estimate algorithm and adaptive force control algorithm have been contrastively studied in the force regulation of HIT-1 dextrous robot hand.

本文在分析阻抗控制力跟踪难点的基础上，对比研究了离线环境参数估计法、在线环境参数估计法和自适应力跟踪法三种阻抗控制的力跟踪方法，并且从实际应用的角度出发提出了适合于HIT-1机器人灵巧手阻抗控制的自适应力跟踪方法。

According to the fact that the otolith system is overcritically damped and the max- imum displacement of the otolith,δ〓 is independent of the dynamics, the upper limit of the Young's module of the gel layer and the estimated value of the dimensionless parameter εwere given,〓 which provided the theoretical basis for the experimental method and the theoret- ical analysis.

根据耳石层运动高度过阻尼而且最大位移〓与运动模式无关的事实，理论上给出了胶质层的Young's模量的上界估计表达式以及无量纲参数ε的参数估计式为〓从而为实验测量方法和理论分析提供了理论依据。

To reduce the influence of an unsynchronized sample sequence on FFT and improve the precision of harmonic in a power system, the harmonic estimation based on interpolation FFT algorithm is proposed. The estimation based on five coefficients of Rife-Vincent window is discussed in detail and the formulas for estimating harmonic patameters are deduced.

由于快速傅里叶变换在非同步采样时存在较大的误差，无法直接用于电力系统谐波分析，本文提出了一种基于五项窗Rife-Vincent插值FFT算法的谐波参数估计的新方法，并推导了其谐波参数估计公式。

Then, in terms of the proposed tuning scheme and frequency-domain control theory, some decupling control methods are studied for the multivariable processes with time delays. The main contribution lies in: 1 For single-parameter diagonal controllers and full matrix controllers of the multivariable control system, a robust tuning scheme is proposed.

首先，给出了系统面临乘性输入、乘性输出，以及加性不确定性时，保证系统鲁棒稳定性的充分条件，并依据此条件，提出了计算控制参数整定范围的解析方法；然后，给出了参数估计方法，用来在参数整定范围内预测初始控制参数；最后，通过主导极点或幅值率调节方法，进一步优化出满足时域设计指标的控制参数值。

Finally, the availability of the parameter estimation method in the parameter estimation of continuous rigid frame bridge was justified.

得出这种参数估计方法在连续刚构桥的参数估计中是可行的。最后，提出了进一步研究的方向。

In addition, because motion vectors must be estimated in the process of region's motion parameters estimation, this paper discussed the theory and general methods of two-dimensional motion estimation and proposes a fast motion estimation algorithm based on the prediction of neighbour block's motion vector.

此外，由于在区域的运动参数估计过程中涉及到对运动矢量的估计，因此本文还讨论了二维运动矢量估计的原理和一般方法，并提出了一种基于邻域子块的运动矢量预测的快速运动估计算法。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。