查询词典 ephemerides

In chapter 2, the base knowledge of satellite is introduced. In chapter 3, GPS satellite ephemerides are discussed briefly.

第二、三章概括了卫星运动的基础知识及轨道摄动分析解，指出了分析解存在的不足。

You may use the on-line New Object Ephemeris Generator to generate ephemerides to enable you to find the object after the first night.

你可以使用在线星历表生成器来计算你发现的目标的以后的位置预报。

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。

After the initial two nights, wait for a week or ten days, then obtain another pair of nights a day or two apart ephemerides can be generated using the Minor Planet Ephemeris Service ）.

在初始的两晚观测后，等待一周或10天，再获取另一对连续夜晚的观测或两个分离的夜晚的观测（可以使用 Minor Planet Ephemeris Service 计算星历表）。

For this reason, you should not distribute observations of the new object and you should only send ephemerides to colleagues that you trust.

出于这个原因，你不要随便发布你的发现，除非给那些你非常信任的合作者。

Because it is not practical to use numerical ephemerides with a large volume of data to describe the kinematics of component stars...

借助已有的观测资料和拟合研究结果，给出了6个等级三星系统的质量参数和初始条件，进而根据实用需求讨论了这些系统的运动学描述问题。

The result indicates that the accuracy of automatically determining orbits is better than that from GPS broadcasting ephemerides.

模拟结果表明，在空间测距精度一定的情况下，自主定轨精度能高于GPS广播星历，因而能较精确地维持卫星系统的坐标框架。

The result of this study provides a method calculating GPS satellite orbit parameters through IGS precise ephemerides.

本文研究的结果提供了一套由精密星历计算轨道参数的方法及一套各个GPS卫星在一个较长时间段内各历元时刻的轨道参数，为进一步的研究提供数据。

This paper compares the position and clock offset of the satellites insight obtained from the broadcast ephemerides file five days prior and posterior to the cancel of SA policy on WUHN station with that provided by final IGS precise ephemerides.

利用全球GPS永久性跟踪站WUHN站在SA取消前后五天的广播星历文件计算得到在视卫星的位置和钟差，与事后IGS精密星历提供的卫星位置和钟差进行比较分析，说明SA取消对广播星历的影响。

In this paper the mathematical models and methods for GPS single-point positioning are studied systematically on the theory.All kinds of error correction formulas are studied,such as ironsphere correction,troposphere correction,relativistic effect correction,earth rotation correction ,earth tides correction ,satellites antenna phase center offset correction. GPS single-point positioning programs is coded with pseudoranges and broadcast ephemerides,phases and broadcast ephemerides,and phases and precise ephemerides.And a great amount of computation has been done using the data collected .The results are computed with the 24 hour pseudoranges observation data before and after the canceling of the SA.

本文从理论上系统地研究了GPS单点定位的数学模型和方法，研究了各项误差改正公式，例如电离层改正、对流层改正、相对论周期部分改正、地球旋转改正、地球固体潮改正、卫星天线相位中心偏差改正；编写了伪距与广播星历、相位和广播星历及相位和精密星历的定位程序，并使用有关数据进行了大量的计算工作。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。