估计

A novel direction of arrival and polarization estimation of electromagnetic vector sensors mounted on the airframe is proposed based on biquaternion. The signal processing model for EM-sensor mounted on the airframe is made by biquaternion and then the eigenvalue decomposition of spectral matrix is obtained by means of the EVD of its quaternion adjoint matrix. The memory requirement for data is reduced, and more accurate estimation result is gotten by deducing the stronger orthogonality constraint between the sin- gal and noise subspaces on the field of biquaternion. The performance of the new algorithm is confirmed through numerical examples.

针对机载电磁矢量传感器阵列DOA和极化参数估计问题，提出了一种基于复四元数估计方法，该算法利用四元数建立机载电磁矢量传感器阵列信号处理模型，然后利用四元数联合矩阵的特征分解得到阵列数据相关矩阵的特征分解，一方面使得计算过程中数据的贮存量大大减少，另一方面通过推导得到信号子空间和噪声子空间在四元数域上的正交性从而使DOA和极化参数佑计的精度更高，仿真证实了本算法的有效性。

Admissibility is one of the important criterions to compare the goodness of estimators in the view of statistical decision.

可容许性从统计判决的角度来衡量估计的优良性，是衡量估计优良性的重要准则之一。

The m-sequence with Cyclic Prefix is inserted between OFDM symbols in time domain as training sequence. The cross-correlation is calculated between the received sequence with CP removed and the appointed circular shifted m-sequence, which takes reliability of the estimation of channel impulse response on account of the two-valued auto-correlation property of the m-sequence, thereby the channel frequency response can be advisably decided.

在时域OFDM符号之间插入附加循环前缀的m序列作为训练序列，在接收端将去掉循环前缀的接收序列与指定的循环移位m序列作相关运算，然后利用m序列的二值自相关特性获得信道的冲激响应估计，从而得到信道的频率响应估计。

In this project, we have tackled the robust fault detection and diagnosis problem for affine nonlinear sampled-data systems based on nonlinear H∞ filtering theory,and focused on the design of robust fault dtetction filter. The main contribution of this project is that we (1)present design methods of robust fault estimator for nonlinear discrete-time systems based on least square estimation and linear matrix inequality;(2)improve the bounded real lemma of systems with finite discrete jumps;(3)develop the robust fault detection filters for affine nonlinear sampled-data systems with parameter uncertainties based on the improved bounded real lemma.

本项目以提高故障的正确检测率为目的，以非线性H∞滤波理论为基础，对不确定仿射非线性采样系统的鲁棒故障检测与诊断问题进行了研究，重点研究了不确定仿射非线性采样系统的鲁棒故障检测滤波器设计问题，取得了一些新的成果，主要成果有：(1)基于最小二乘估计和线性矩阵不等式，给出了非线性离散系统的鲁棒故障估计器设计方法；(2)改进了有限跳跃点系统的有界实引理；（3）基于改进的有界实引理，给出了不确定仿射非线性采样系统的鲁棒故障检测滤波器的设计方法。

It is the real difficulty to assess the aftereffect of supply chain risk caused by uncertain contingent events.

不确定偶发风险事件导致的供应链风险后果的估计是风险估计的难点所在。

We use few training symbols to solve phase ambiguousness and order overestimation in EVI blind identification.

我们使用极少量训练符号解决了EVI盲识别算法中的相位模糊和过估计问题，并给出了估计噪声方差和信道幅度因子的方法。

The effects of small angle rotation of texture images and noise to the parameterestimation of Gauss-MRF model are researched.

研究了工件表面纹理图像的小角度旋转和噪声对高斯马尔可夫随机场模型的参数估计的影响，数据分析表明高斯马尔可夫随机场模型所估计的参数对于小角度的旋转纹理具有不变性。

Many numerical results are provided to demonstrate the high resolution of the proposed methods. Compared with the conventional MUSIC method, the proposed methods are insensitive to angular signal distribution.

仿真实验结果表明，这些分布式目标波达方向估计方法都具有较高的分辨能力，与基于点目标假设的常规MUSIC方法相比，本文提出的分布式目标DOA估计方法对信号源的分布特性不敏感。

If further refinement is to be performed then the aposteriori error estimators are used as a guide as to show the refinement mightbe accomplished most efficiently.

尽管加密的方法几乎总是根据后验误差估计来进行自适应，但对于移动网格方法来说，我们还没有看到使用后验误差估计构造控制函数的文献。

The states of system and the faults in system are estimated simultaneously. The inputs of the fault approximator are the estimated states.

首先提出一种状态估计器设计方法；然后在进行状态估计的同时用RBF神经网络来逼近系统所发生的故障。

And Pharaoh spoke to Joseph, saying, Your father and your brothers have come to you.

47：5 法老对约瑟说，你父亲和你弟兄们到你这里来了。

Additionally, the approximate flattening of surface strip using lines linking midpoints on perpendicular lines between geodesic curves and the unconditional extreme value method are discussed.

提出了用测地线方程、曲面上两点间短程线来计算膜结构曲面测地线的方法，同时，采用测地线间垂线的中点连线和用无约束极值法进行空间条状曲面近似展开的分析。