坐标系的

This method represents the virtual objects in Euclidean space instead of in affine space, which is consistent with the popular graphics rendering tools such as OpenGL and is more common in practice. A new classification based local and global tracking strategy to match features between the reference image and the currently frame directly is presented, which enables the augmented reality system working effectively even under large changes of viewing angles. A novel affine coordinate system definition method based on a collection of feature points is also proposed, which makes the tracking method effective even when not all the reference points are detected during the whole process, as long as there are at least four pairs of reference points correspondences.

该方法以仿射变换为桥梁来建立欧氏空间下的摄像机坐标系与世界坐标系之间的变换关系，它与OpenGL等当前流行的图形渲染工具一致，具有更强的通用性；采用基于分类的自然特征匹配策略，能够在视角和视点发生大幅度变化情况下依然正常工作；提出基于特征点集合的仿射坐标系定义方法，使增强现实系统在最小配置下只需4点追踪成功即可完成注册，比需要6点的透视投影方法具有更好的健壮性和精确性。

It resolves the backward of long delay in fast-changed acceleration of target tracking in Cartesian coordinates or spherical coordinates.

该方法克服了在直角坐标系和球坐标系上估计目标快变加速度机动延迟大的缺陷，能实时、精确地估计出目标加速度、速度和位置。

The main contents of this dissertation are as follows:1 A station orthogonal coordinate system, which is the reference coordinate system for the three-dimension adjustment of observation data of GPS dam deformation monitoring network, has been put forward.

主要包括内容以下：(1)提出了以站心地平坐标系作为GPS大坝三维变形监测网平差的参考坐标系，推导了在该坐标系下GPS大坝三维变形监测网平差的数学模型及公式；采用拟稳平差的方法对GPS大坝三维变形监测网观测数据进行处理。

A special type of half-plane problems of elasticity is presented and discussed. By using two methods in polar coordinates and orthogonal coordinates respectively, the analytical expressions of stress components are solved in the two coordinates. There are little differences between both results, which confirm the equivalence of the two methods.

针对一类特殊的弹性半无限平面问题，分别给出了其在极坐标系与直角坐标系下的求解过程，获得了在这两种坐标系下应力分量的解析表达式，并对这两种解法的结果进行了比较与讨论。

In the rneantime, according to the characteristics of ADS data, the registration algorithms in Geodetic coordinate system and radar polar coordinate system are further proposed.

同时，针对ADS数据的特性，又进一步提出了在Geodetic坐标系和以雷达站为极点的极坐标系（以下简称雷达站极坐标系）中的系统误差校准算法。

The conversion between space rectangular coordinates is emphatically expatiated, and practical operations on the accomplishment of the conversion were conducted.

着重阐述了空间直角坐标系之间的转换关系，并为实现这一转换进行了实践操作，在转换过程中运用了高斯投影的反变换、大地坐标系与空间直角坐标系之间的转换等诸多理论。

The application of polar coordinates system in the CNC LATHE-MILLING;2. A fast particle-moving algorithm for particle-in-cell simulation of plasmas in polar coordinates system was proposed, in which the local rectangular coordinates approximation was used in the area near the position of the charged particle at every time step.

提出了一种在极坐标系下快速推进带电粒子的等离子体粒子模拟算法，该算法在每个时间步长内对带电粒子位置附近的区域采用局部直角坐标系近似，并通过坐标变换，得到粒子运动方程求解的显式格式，从而避免了极坐标系下隐式格式直接迭代求解所带来的容许误差，并提高了计算效率。

A frame is set up in this paper that the unit vector of the star is taken as Z axis of the frame, and all the constant gyro drifts of inertial navigation system are projected on to the frame .

如果建立一个以星体方向为Z轴的坐标系，并将陀螺漂移投影到该坐标系，文中将证明绕该坐标系Z轴方向的陀螺漂移是不可观测的，并分析由此引起的导弹落点误差。

The speed-sensorless vector control and the identification of motor parameters in this paper are the two novel research of vector control.Using asynchronous machine's mathematic model in three-phase static reference frame, this paper has derived it's mathematic model in two-phase static reference frameand in two-phase rotating reference frame, and got the coordinate transformance formulus based on the constant magnetic force and power force, by compared different field orientation methods, we can find that field orientation at rotor field can realize the decoupling of the stator current flux component

无速度传感器矢量控制和电机参数辨识是矢量控制的两个新的研究方向，本文利用异步电机在三相静止坐标系下的数学模型推导出两相静止坐标系、两相同步旋转坐标系下的数学模型，根据磁动势守恒和功率守恒的原则，得出各坐标变换公式；通过不同磁场定向方式的比较发现，异步电机按转子磁场定向时定子电流励磁分量和转矩分量可以比较方便地实现解耦。

According to the projection matrixes, the relation of the binocular camera models can be gained.

之后在获得的一系列的参数以及给出的世界坐标系、摄像机坐标系和图像坐标系之间的相互转化关系的前提下，建立了双目摄像机模型。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了