查询词典 parameter estimation

The motion dynamics and echo models of the precessing warhead in single frequency are set up. Based on a quantitative analysis on echo spectrum and micro-Doppler modulation of precessing cone, a precession parameter estimation method by echo correlation and spectrum width is proposed. The experiments on data by simulation and darkroom measurement verify the method.

建立了单频信号下雷达观测弹头的进动模型和回波模型，通过对进动弹头回波频谱与微多普勒调制特性的定量分析，提出了利用回波相关方法和频谱展宽估计进动参数的方法，并利用暗室测量数据对该方法的性能进行了实验验证。

In the second research part of this thesis,the problem of speech enhancement is reformulated as both autoregressive parameter estimation and speech signal prediction .

论文的第二部分将语音增强问题归结为自回归参数的估计与语音信号预测联合问题。

If we still use OLS to form the model, the parameter estimation and the steadies of the model will be poor.

解决建模中的共线性问题，现有不少方法，其中偏最小二乘法是一种较为有效的方法。

This algorithm is based on Ref[1,2] and perfectly improves the method for choosing forgetting factor, and in the algorithm the auto-regulation factor is introduced so as to cope with parameter estimation of fast time varying systems such as missile control system, etc., Digital simulation results show that this algorithm is satisfactory for identifying the parameters which change in the form of some typical functions (e.g., exponential, slide, step, sine, square or their combination).

这种方法主要是在文献 [1，2]的基础上改进了遗忘因子的选取方法，引入了自动调整遗忘因子，以适应导弹控制系统等快速时变系统的参数估计要求。数字仿真结果表明，这种辨识方法对于诸如参数的指数变化、斜坡变化、阶跃变化、正弦变化、方波变化以及由这些变化形式构成的混合变化，都有比较好的辨识效果。

Theories and applications on Copulas had been widely studied, especially parameter estimation methods.

关于Copula函数的理论和应用已有不同深度的研究，特别是Copula函数中未知参数的估计问题。

The nonlinear parameter estimation technique can simultaneously estimate the thermal conductivity,heat transfer coefficient and absorbed energy.

采用非线性参数估计可同时估计出热扩散率、散热系数以及试样吸收的能量。

Assessment of image quality ; parameter estimation ; JPEG ; Laplacian distribution

图像质量评价；参数估计； JPEG图像； Laplacian分布

A long line equation based on line parameter estimation algorithm is proposed in this paper.

提出一种基于长线方程的输电线路参数在线求解算法。

The experiment data of paramecium from Gause was used to investigate the efficiency of the method. And the twelve nonlinear real examples from "Agricultural Experimental Statistics" written by Mo Huidong were used to compare the difference between results fit by the Excel and the linear transformation method, respectively. The result showed that the Excel fitting method is not only simple and efficient for the parameter estimation but can fit various complex nonlinear equations also.

采用Gause的4组草履虫数据，研究了用Excel的&规划求解&工具进行非线性方程拟合的有效性，并以莫惠栋的《农业试验统计》一书中的12个非线性方程实例，比较了用Excel拟合与用常规线性转换方法拟合的差异，结果表明：用Excel进行非线性方程的拟合不仅简单易行、获得更优的参数估计，而且可以拟合各种复杂的非线性方程。

Uneven-aged forest stand ; matrix model ; transition probability ; parameter estimation

提出直接用直径生长量来估计异龄林林分生长矩阵中的转移概率。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。