New positioning techniques are needed. To implement a GPS-free and fixed-grids-independent three-dimensional positioning system is challenging in multi-hop wireless networks.
实现不依赖GPS和固定网络设施的三维定位，是多跳移动自组网络中具有挑战性的新课题。
Objective: Measuring the secure depths and angles of Yamen acupoint with three-dimensional positioning MRI to provide the reference datas of secure depths and angles for clinic.
目的：通过使用三维定位MRI测量哑门穴进针的安全深度、角度，为临床提供安全针刺深度和角度的参考数据防止意外事故发生。
Objective: To approach the feasibility of the three-dimensional positioning and navigation with regular catheter electrodes in intracavitary with a low-frequency electrical field.
目的：探讨基于低频电场方式进行心腔内三维定位导航及心内膜重构的可行性。
Other examples of direct manipulation are the resizing of a graphic object in a drawing application and the positioning of an object or camera view in a three-dimensional scene.
其他的一些直接操作的例子如在画图类的程序中调整图像的大小，在三维场景中移动对象和视角等。
Global Positioning System(GPS)is a satellite navigation system designed to provide instantaneous three-dimensional position infbrmation almost anywhere on the globe at any time, and in any weather .
GPS全球定位系统以其全球性、全天候、实时定位等优点显示出强大的生命力和竞争力，在航空、航天、航海及许多民用领域有着广泛的应用。
The system uses the triangle survey principle to realize three dimensional positioning and uses the rich lookup table structure of FPGA to complete the algorithm.
该系统采用三角形测量原理实现三维精确定位，利用FPGA丰富的查找表结构完成算法。
Global Positioning system (GPS) is a radio navigation system which provides free users with accurate longitude, latitude and elevation of three-dimensional position information and time information.
全球定位系统(GPS)是为用户提供免费而精确的经度，纬度和海拔三维位置信息与时间信息的无线电导航系统。
This paper introduces the principle, functions and working process of the three - dimensional laser scanning and positioning system .
介绍了激光立体扫描对位系统的原理，功能和工作过程，提供了相应的技术参数。
By controling the three-dimensional motion of the X-Y table and bond head, precision positioning and desired line-type gold wires can be realized, and an ultrasonic wave bonded method is used.
工作原理是通过X-Y工作台和焊头的三维运动控制，定位并拉出设定的金丝线型，采用超声波热压球焊方法焊接芯片管脚。
By controling three-dimensional motion of the X-Y table and bond head, precision positioning and desired line-type gold wires can be realized, and an ultrasonic wave bonded method is used.
工作原理是通过X-Y工作台和焊头的三维运动控制，定位并拉出设定的金丝线型，采用超声波热压球焊方法焊接芯片管脚。
By controling three-dimensional motion of the X-Y table and bond head, precision positioning and desired line-type gold wires can be realized, and an ultrasonic wave bonded method is used.
工作原理是通过X-Y工作台和焊头的三维运动控制，定位并拉出设定的金丝线型，采用超声波热压球焊方法焊接芯片管脚。
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