简要介绍了城市轨道交通供电系统中接触轨的组成及安装工艺方法。
It is introduced in this paper the composition and installation techniques of conductor rails in the urban rail transit power supply system.
在这些模型中并没有一种在任何情况下都是最好的，因此，对于特定轨道选择合适的大气密度模型对提高定轨预报的精度是非常重要的。
Therefore, it is very important to choose an appropriate atmospheric density model for a specific orbit to improve the accuracy of orbit forecast.
电离层掩星观测中，当低轨卫星(LEO)轨道高度较低时，轨道以上的电离层电子总含量(TEC)对掩星反演的影响不能忽略。
When the low-Earth orbit (LEO) satellite is low, the contribution of the Total Electron Contents (TEC) above the satellite is not neglectable for inversion of GPS-LEO ionospheric occultation.
对双星定位系统在中低轨卫星轨道确定中的应用做了详细的分析，给出了在该系统的测量模式下中低轨卫星定轨的几种方法。
The application of Bi-satellite positioning system to LEO or MEO satellite orbit determination be analyzed and discussed some corresponding orbit determination methods.
在实际治理啃轨现象的工作中，一般是以提高车架和车轮的安装精度，校正和消除起重机和轨道的缺陷为主要方法。
The error of the frame and the trail which make the crane not in parallel with the rail track is the cause of off-tracking.
在实际治理啃轨现象的工作中，一般是以提高车架和车轮的安装精度，校正和消除起重机和轨道的缺陷为主要方法。
The error of the frame and the trail which make the crane not in parallel with the rail track is the cause of off-tracking.
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