查询词典 parameter estimation

Although the frequency offset estimation algorithm based on PN sequence and that of equal pilots in time domain are both unbias, the frequency offset estimation algorithm based on equal pilots in time domain is less complex and more precise.

而且，基于时域等值导频的频偏估计算法没有采用相关运算，其算法复杂度比基于PN序列频率偏移估计算法低。

The result obtained from the estimation demonstrates that the estimation harmonic frequency, amplitude and phase are very accurate using the improved algorithm for the analysis of an unsynchronized sample sequence.

实验结果表明：该算法较FFT算法在频率、幅值和相位的估计值精度上有明显提高。

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。

The resolving power of time delay estimation method based on correlation is anglicized in theory and the way of improving performance of time delay estimation is advised.

理论分析了相关分析时延估计法的分辨能力，指出提高基于相关分析时延估计方法分辨性能的途径。

In order to design an actual pile foundation it is common to collect as much as possible information concerning pile ultimate load capacity for that project from available sources, induing estimation by using some empirical formulas, thus it forms an estimation distribution.

为具体桩基工程的设计，从各渠道收集到的有关该工程的极限承载力信息，包括用各种经验式估算，构成一个估计分布，然后结合实地进行的静载荷试验资料应用Bayes理论将上述各项数据进行综合更新，最终得到一个后验的极限承载力均值及其标准差。

Based on the conclusion, we adopt a new method to eliminate multiples, which is to use the statistic character of error, obtain inverse wavelet's estimation, correct misshaped inverse wavelets for non-orthogonality in inverse wavelet domain by the estimation. The method mainly has four steps.

在此基础上，本文提出了在逆子波域（单道自适应相减滤波的滤波算子的集合），利用其误差的概率分布特征，对逆子波进行估计，用逆子波的估计对逆子波进行校正来消除多次波的方法。

Firstly, after getting predicted multiples, we use adaptive subtraction algorithm to eliminate multiples and get some inverse wavelets corresponding to every trace in one shot gather, then construct inverse wavelets domain by those inverse wavelets. Secondly, use median filtering method to get inverse wavelet estimation in inverse domain. Thirdly, correct the misshaped inverse wavelets in inverse domain by the inverse wavelet estimation.

其步骤为：首先用SRMA方法预测出表面多次波，并对每一单炮进行单道自适应相减，得到逆子波，形成逆子波域；其次，在逆子波域采用中值滤波，提取接近真实逆子波的逆子波估计；第三，在逆子波域用逆子波估计对畸变的逆子波进行校正；最后采用校正后的逆子波来衰减多次波。

The estimation of noise level of noised image and the procedure of de-noising threshold estimation are put out in this chapter.

文章给出了含噪图像信号噪声水平的估计及不同尺度子图的消噪门限估测过程。

Multiple linear stepwise regression estimation and exponential smoothing estimation of time serial are used to obtain the estimating models of the 12 omening indices.

用多元线性回归预测和时间序列指数平滑方法预测，建立了12项单指标的预测模型。

Based on the study and inheritance of the domestic and overseas achievement in the related field, this thesis makes research into the theory and application: On theory, this thesis puts forward the concepts of Engineering Cost, Engineering Cost Management and Engineering Cost Estimation, analyzes the relation between them; And it introduces the factors which influence the engineering cost estimation, then puts forward the study of the methods; It particularizes the common methods of estimating the engineering cost, introduces the principle, the operation and the application condition, and analyzes the advantages and disadvantages of each method; By introducing the mention, the principle, the reasoning process and the comparison with the traditional reasoning mechanisms, it makes out the essence of this method, and views it as a whole.

本文在研究、继承已有国内外研究成果的基础上，在理论和应用方面都进行了研究：理论方面，提出了工程造价、工程造价管理、工程造价估算的概念，分析之间的相互关联；介绍工程造价估算的影响因素，提出对编制方法的探讨；列举出目前常用的工程造价估算方法，介绍各种方法的原理、使用方法及应用条件，分析各自的优缺点；通过介绍基于案例推理的提出、基本原理、推理过程和与传统推理机制的比较，剖析该方法的精髓，对其有了整体把握。应用方面，基于对研究对象的深刻理解，分析了工程造价估算问题和基于案例推理二者结合的必要性和可行性；建立了基于案例推理的工程造价估算系统，综合运用模糊数学、灰色理论、运筹学等知识，构造了系统算法；并运用上述理论和方法进行了实例分析，实现了基于案例推理的工程造价估算问题的初步研究，使得运用基于案例推理方法解决工程造价估算问题的设想得到了肯定。

Bob Eckert has been chairman and chief executive of Mattel for eight years.

美泰董事长兼首席执行官鲍勃·埃克尔特在任已8年。

The outlook for honors and disgraces carries on and surpasses the traditional outlook for honors and disgraces theoretically, and carries on and develops the theory of construction of socialist mora...

社会主义荣辱观的提出在理论上是对传统荣辱观的一次继承和超越，是对社会主义道德建设理论的继承和发展，在实践上有利于形成良好的社会风尚。