查询词典 ephemerides

Parameters used in GPS broadcast ephemerides are also assessed.

本文第一章为绪论，详述了本文的研究目的及意义。

If you wish someone else to follow-up your new discovery, you should use the New Object Ephemeris Generator to generate ephemerides to enable your colleague to find the object after the first night.

如果你希望其他人来持续观测你发现的目标，你应该使用&新目标星历表发生器&去产生星历表好让你的合作者在第一晚后去发现它。

In chapter 5, based on nine-parameters, orbit parameters of many satellites are calculated. Then some conclusions are drawn, and parameters used in GPS broadcast ephemerides are evaluated.

第五章以九参数法所得结果为基础，进行了初步分析，得出了一些初步结论，并采用几何图解分析法分析了日、月引力摄动的长周期，还对GPS广播星历采用的参数进行了评估。

GPS satellite precise ephemerides provided by IGS describe there dimension position of GPS satellites in ITRF.

IGS提供的精密星历描述了GPS卫星在地固系中的三维位置。

Because it is not practical to use numerical ephemerides with a large volume of data to describe the kinematics of component stars in a star catalogue, a kinematics model, as simple and practical as possible, is needed for the hierarchical triple star systems.

因为在实用星表参考架中不宜采用数据量较大的数值历表来描述子星的运动，所以有必要针对等级三星系统建立尽可能简单实用的运动学模型。

Java Core API for Celestial Calculation - Java algorithms to calculate celestial ephemerides, for astronony, and celestial navigation.

这个项目提供了用于计算星历表的Java算法，供天文学和天体导航学使用。

This paper focuses on how to calculate GPS satellite orbit parameters through IGS data. Choosing a group of appropriate parameters, and the relationship between satellite position in ITRF and these parameters are founded, and these parameters can be estimated using some successive ephemerides. Three different methods are introduced detailedly.

本文以IGS精密星历为基础，深入研究了利用精密星历计算GPS卫星轨道参数的模型与方法，并对三种不同的计算方案进行了比较研究，其目的是寻找一种合适的计算方法，得到能够正确反映一个较长时间段内(如800天)轨道参数随时间变化的规律。

The feasibility of computing PWV with IGS ephemerides is discussed. With 48 hours continuous GPS monitoring data of 13 points, the PWV time serials are extracted out.

从理论上分析了在缺少地面气象资料时用模型估计气象元素对反演PWV的影响，分析了用IGS超快速星历代替IGS最终精密星历准实时计算PWV的可行性。

Inaccurate measurements lead to bad orbital parameters and hence bad ephemerides - this is why three measurements on an FMO are necessary for the MPC to accept an object onto the CP.

错误的测量会导致错误的轨道参数计算结果——这就是为什么在上报给国际小行星中心的时候一定要测量三个点才有可能被接受并出现在确认页面上。

The positioning result of phase and broadcast ephemerides are gained using time-satellite differential model after canceling SA, the precision for 24 hours phase observation data is about 1.1 metre,the precision for 2 hours phase observation data is about 1.3 metre,the precision for 1 hour phase observation data is about 1.6 metre ,the precision for 20 minutes phase observation data is about 2.7 metre.

采用时星差模型得到取消SA后相位和广播星历的定位结果：用24小时的相位观测数据定位精度在1.1米水平；用2小时的观测数据定位精度在1.3米水平；用1小时的观测数据定位精度在1.6米水平；用20分钟的观测数据定位精度在2.7米水平。

I hope that this success is just the first in a long series.

我希望这只是成功的开始。

Three dimensional stresses on the interface of tire and soil, tire deflection and soil sinkage are measured.

测试轮胎——沙土界面上的三向应力、轮胎变形和沙土沉陷；建立考虑剪切应力对沙土承载特性产生影响的车轮牵引性能预测模型；分析车轮作用下土壤的纵向稳定性。