精度

In this paper,the scheme of autonomous orbit determination of satellite is described,the extended Kalman filter algorithm based on improved numerical method is put forward.

高精度的自主定轨对探测器实现深空探测任务有着重要的意义，结合利用星光折射角的测量确定卫星轨道的自主导航方案，提出了基于数值算法改进的扩展卡尔曼滤波算法，提高了运算精度，通过仿真验证了该算法的优越性。

We have known that the finite element solution can get the convergence accuracy order of m+1 in global interval and of 2m in the nodes.

我们已知有限元解在整体区间上能达到m+1阶的收敛精度，节点处能达到2m阶的收敛精度。

In the field of testing, the testingprecision of equipment is one order of magnitude higher than the tested unit.

在测量技术领域中，测试设备的精度要比被测设备的精度高出一个数量级以上。

The errors and area limits caused by the lunar curvature were avoided in this model established under the Selenocentric Orthogonal Coordinate System, the accidental errors of exterior line elements were reduced by orbit fitting and interpolation, the polynomial orders of systematic errors in satellite orbits were decreased with their expression in the flying coordinate system moving and rotating with satellites, and the reliability of exterior orientation solution was enhanced under the condition of sparse and low accuracy control points by appending constraint of orbit and attitude parameters.

该模型通过在月心直角坐标系进行影像空中三角测量来消除月球曲率引起的误差和测图范围限制，通过轨道形状的拟合与插值来减小摄影时刻轨道位置的偶然误差，在飞行坐标系中建立轨道修正模型来减少定向参数的数目，对轨道和姿态增加约束条件来提高月面控制点数目稀少及精度低条件下外方位解算的精度与可靠性。

Conventionally the electric load forecasting can hardly attain a result whose accuracy meets what's required. A short-term load forecasting model is therefore developed to solve the problem, based on the process neural network of which the input is the function of time and the high forecasting accuracy is available. Describes the structure of the model, discrete data fitting method by the expansion of function orthogonal basis and learning algorithm.

针对目前常用方法在解决负荷预测问题时，结果往往难以达到工程要求精度的现状，利用过程神经网络输入为时间函数以及预测精度高的特点，建立了基于过程神经网络的电力系统短期负荷预测模型；给出了模型的结构，基于函数正交基展开的离散数据拟合方法以及模型的学习算法。

The numerical techniques developed here, including the high accuracy method of using expansions in orthogonal functions in normal direction and the effective algebraic mapping to deal with the problem of infinite region, can raise the calculation precision and the convergence velocity greatly.

文中所发展的方法，如，在法向上采用高精度的高阶谱方法和对无限区域数值问题的更为有效的代数变换处理等，提高了计算精度和收敛速度；同时，通过预估校正迭代法，使抛物化稳定性方程中重要的正规化条件得到满足，保证了数值计算的稳定。

In order to improve the query precision further, we employ the Singular Value Decomposition techniques to convert the high dimensional proximity vector space into low dimensional orthogonal concept space to match the documents more accurately.

为了进一步提高邻近关系模型特征表示的准确性，我们使用单值分解技术，将高维邻近关系空间转化为正交的低维特征语义空间，消除邻近关系的次要特征对信息检索精度的影响，进一步提高基于邻近关系模型的信息检索精度。

The result shows that all the three polynomials can be used to reconstruct the wavefront correctly, the reconstruction precision of the orthogonal Zemike polynomial in square zone is comparatively better though the difference of the reconstruction precision among the three polynomials is not apparent.

结果表明：对于方形区域上的波前重构，上述三种多项式都能正确地重构出待测波前，它们的重构精度差别不大，相比之下，方域上正交的Zernike多项式的对待测波前的重构精度更高。

The design of finite impulse reponse filters which is based on the window function may produce oscillation for the non-uniform convergence of the filter, which affects the precision of the filter,but improvement on the precision need increase the calculation amount,which is unfavorable to the real-time system.

用窗函数法设计FIR滤波器，由于非一致收敛而产生振荡，从而影响了滤波器的精度，而提高精度是以增加计算量为代价的，对于实时系统是很不利的。

The incident angle of parallel light beam is hard to measure accurately in a large measurement range.A measurement method based on the optical vernier measuring principle,which is more accurate,is presented in this paper.

为解决平行光入射角度精确测量时，很难同时实现高精度和大量程两方面的测量性能要求的问题，提出了一种基于光学游标测量原理的大量程条件下的高精度平行光入射角度测量方法及测量装置。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。