track station

A train travels from a station to the next along a level track, it is necessary to finish the journey within a given time and to minimise the energy consumption.

火车沿水平轨道从一站运行到下一站，要求在给定的时间内完成该行程并使能耗最小。

But in plain regions, when there is no need to differentiate the track a train passes through in railway yard and station, the positioning job can be done with GPS only.

在平原地区，且不需分辨列车经由的站场线路时，仅采用GPS即可。

It divides the track station into small rectangular areas, then obtain the track segment to be matched though combination of the concentric circle and the rectangular.

该算法首先将轨道站场图划分成阵列矩形小区域，通过一对同心圆与单个矩形区域结合获得待匹配轨道段。

The antenna employs a dual gimbal mechanism to track the earth station when the spacecraft is in lunar orbit.

该天线采用了双万向接头结构，以便航太器在月球轨道跟踪地球站基站。

Study and Application of High Performance Concrete in Beijing South Railway Station Reconstruction and Beijing D-train Running Track Project

北京南站改扩建工程与北京动车段走行线工程中高性能混凝土的研究与应用

Research methods: By studying documentation and taking Datong-Qinhuangdao Heavy-haul railway for example, this paper determines the working scope and rational effective length of the receiving-departure track for heavy load train in technical station.

研究方法：通过文献研究并以大秦线为例，确定重载铁路技术站到发线作业内容及合理的到发线有效长度；

Research conclusions: The minimum total length of the receiving and departure track for 20 000-ton train in technical station is 3019.24 m, the effective lengths of the segments of the 3 middle switch are 665.24 m, 665.24 m, 665.24 m and 850 m respectively.

研究结论：接发20000t列车的技术站到发线总长度最小可以按3019.24m设置，3个腰岔的设置由前至后各段有效长分别为665.24m，665.24665.24m和850m。