查询词典 tracking

Solar automatic tracking system according to the local latitude and longitude of automatic detection day and night, and the application of solar radiation and brightness of the environment compared to the automatic tracking system makes the accuracy, reliability, in the course of sunny real-time detection to keep the correct time and angle data, due to seasonal changes and eliminate the accumulated error.

太阳自动跟踪系统能根据当地的经纬度自动检测昼夜，并应用了太阳辐射与环境亮度的比较，使得该自动跟踪系统的准确性高、可靠性强，在晴天检测过程中能实时回存正确的时间和角度数据，消除因季节变化而产生的积累误差。

According to the wire electrode on the trajectory of the different forms of control, WEDM can be divided into three types:* is a copy-control, cutting their lines in advance to create the shape of the workpiece and the same mode *, When the rough machining parts and die at the same time * Clamping in the machine tool table, in the process of cutting wire electrode tightly * close to the edge of model for mobile track, thus cutting out the model * with the same shape and precision to work; another One is the optical tracking control, the cutting in line before the first parts in accordance with drawings by a certain ratio of enlarge depicts an electro-optical tracking maps, drawings will be processed when the machine electro-optical tracking placed on the stage, followed on the stage The first photo has to follow the ink line graphics track movement, and then through the use of electrical, mechanical linkage to control the machine tool table work together with the relative electrode wire Xiang Sixing do sports in order to cut out the pattern and shape of the workpiece to the same; a re - Is a digital process control, advanced digital automatic control technology, machine-driven process in accordance with the geometry of the workpiece before the parameters of good pre-processing CNC automatic completion of the processing, production do not look like without drawing board also plans to enlarge, in front of more than two Control in the form of higher precision processing and broad scope of application, at home and abroad for more than 95% of WEDM have been using digital technology.

根据对电极丝运动轨迹的控制形式不同，电火花线切割机床又可分为三种：一种是*模仿形控制，其在进行线切割加工前，预先制造出与工件形状相同的*模，加工时把工件毛坯和*模同时装夹在机床工作台上，在切割过程中电极丝紧紧地贴着*模边缘作轨迹移动，从而切割出与*模形状和精度相同的工件来；另一种是光电跟踪控制，其在进行线切割加工前，先根据零件图样按一定放大比例描绘出一张光电跟踪图，加工时将图样置于机床的光电跟踪台上，跟踪台上的光电头始终追随墨线图形的轨迹运动，再借助于电气、机械的联动，控制机床工作台连同工件相对电极丝做相似形的运动，从而切割出与图样形状相同的工件来；再一种是数字程序控制，采用先进的数字化自动控制技术，驱动机床按照加工前根据工件几何形状参数预先编制好的数控加工程序自动完成加工，不需要制作模样板也无需绘制放大图，比前面两种控制形式具有更高的加工精度和广阔的应用范围，目前国内外95％以上的电火花线切割机床都已采用数控化。

Adaptive Vold-Kalman order tracking was carried out based on the algorithm of STFT_VA. In contrast with traditional method of Vold-Kalman order tracking, the method includes some advantages, for example, tacho and other hardwares are not necessary to be employed to do order tracking.

实现了基于STFT-VA算法的自适应Vold-Kalman阶比跟踪，和传统的以硬件实现的Vold-Kalman阶比跟踪相比，此方法具有无需转速计等硬件、用纯软件的方法实现。

Firstly, based on the sliding mode control and backstepping technique, a new attitude tracking controller is derived to control the attitude motion of spacecraft, the stability of the system is analyzed via Lyapunov method and the reaction wheel dynamics is also considered from the real applications point of view. The whole design process is divided into two steps: the first step is to use sliding control technique to design suppositional adaptive variable structure controller; and the second step is to design attitude tracking controller based on SMC and backstepping technique. Numerical simulations are performed to show that both tracking maneuver and vibration suppression can be accomplished effectively.

首先，采用自适应后步法结合主动振动控制技术设计了姿态跟踪鲁棒控制器，基于Lyapunov方法分析了系统的渐近稳定性；在此基础上，显性地考虑了执行机构动态特性问题，将整个设计过程分为两个步骤：第一步采用滑模控制技术设计了变结构虚拟控制器，给出自适应控制律的设计方法；第二步，将后步法与滑模控制技术相结合，设计了姿态跟踪鲁棒控制器，给出飞轮电压的输入算法及稳定性分析；最后，将提出的控制方法应用于挠性航天器的姿态跟踪控制，通过数值仿真对所提方法的可行性与有效性进行分析和验证。

Moderate noise (75、85dBA), didn't has significant effect on simple control and reaction task such as two-hand coordinate tracking, complex reaction time and persuit aiming. After sustained exposure of 1. 5h to noise with intensity of 85、95 dB , there was a tendency to decrease in light tracking performance of dual task (light tracking and oddball vedio-moter reaction) with a very large difference among subjects. The attention distribution between main task and second task changed.

中等强度的噪声（75、85dBA），对于双手协调光标追踪、复杂反应时及目标跟踪等较为简单的操纵和反应并无显著影响；85、95dB强度的噪声持续暴露1.5h，可使双重任务（光标追踪和oddball视觉-运动反应）的光标追踪绩效有降低的趋势，并有很大的个体差异，主、次任务之间的注意分配发生了改变。

GPS tracking station at Zhongshan Station in Antarctica to establish China's first annual GPS tracking station, mapping team will be wintering in the Zhongshan Station in order to ensure that the satellite tracking station and the new tide gauge stations data and information collection, to achieve a normal and stable operation.

中山站GPS 跟踪站是我国在南极设立的第一个常年GPS跟踪站，测绘队员将在中山站越冬，以确保卫星跟踪站和新验潮站的数据和信息采集，实现正常稳定运行。

In this paper, after researching various arithmetic of real-time tracking the author probe into these correlative tracking arithmetic and provide a new real time tracking arithmetic based on template self- correlation. It is a useful arithmetic that proved effective and feasible by series examination.

本文通过对各种实时跟踪算法进行研究后，针对相关跟踪算法进行了探讨，提出了基于模板自相关的实时跟踪算法，实验证明算法是有效和可行的。

To overcome target expansion, shape transformation and occas ional frame lost due to the missile phase motion of television guided bombs , a modified weightˉrelated function, t arget tracking strategy, template updating and modifiˉ cation, and tracking point positioning method as well as a predict ion method to solve the frame loss of target were proˉ posed. Based on this, an improved weightˉrelated matching tracking a lgorithm was realized.

针对电视制导炸弹中弹目相对运动变化而导致的目标尺度变化、几何形变以及随机因素造成的暂短丢帧现象，文中对相关测度函数进行了基于弹-目距离的中心加权修正，提出了相应的模板更新与修正策略、基于线性预测的目标位置的预测方法、跟踪点的定位方法等，在此基础上，实现了基于加权相关的图像匹配跟踪算法。

At first,the performance of different discriminators in code and carrier loop are compared based on anlyzing the principle of GPS tracking.Then the tracking effects with different loop patameters are simulated and compared.At last,a couple of discriminators are selected and proper loop parameters are designed to track actual GPS intermediate frequency signal,and the tracking results validate the design.

在分析GPS跟踪原理的基础上，对比码环与载波环不同鉴相器的性能，然后在不同环路参数下对跟踪效果进行了仿真比较，最后选择一组鉴相器并设计合适的环路参数，对实际采集的GPS中频信号进行跟踪，跟踪结果验证了设计环路的有效性。

TV photoelectric theodolites made up of optics, machine, electron and computer is a complex tracking and measuring instrument. TV photoelectric theodolites used in especial proving ground is a new kind of photoelectric tracking and measuring instrument. Tracking precision is a main parameter.

电视光电经纬仪是集光、机、电与计算机应用技术于一体的大型复杂测量系统，它是广泛用于特种试验场的一种新型光电跟踪测量设备，跟踪精度是其最重要的的技术指标之一。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。