ephemeris

Different road parameters and user positions. It shows that the main influence factors to user's plane accuracy are the ranging errors and the ephemeris errors, while to the height accuracy is come directly from the height error of the road database.

理论分析表示，测距误差、星历误差是影响用户平面精度的主要因素，而道路数据库的高程误差是影响用户高程精度的主要因素。另外，也进一步验证了该方法的可行性和可靠性。

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The evolution of time measurement system has experienced the following stages in general: the ancient time measurement systems, universal time, ephemeris time, atomic time and universal time coordinated.

时间计量系统的演变大致经历了如下几个阶段：古代的时间计量系统、世界时、历书时、原子时、协调世界时。

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This paper, after analysing the calculations of the solar ephemeris according to the Newcomb's solar formula, establishes a simple mathematical model of solar ephemeris suitable for a pocket computer or programe calculator.

本文首先根据纽康的太阳公式，对太阳历表的计算进行了分析，从而建立了一个适用于袖珍电子计算机或程序计算器的简便太阳历表数学模型。

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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。

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The Accuracy Analysis of the User Arithmetic GLONASS Broadcast Ephemeris

GLONASS广播星历用户算法精度分析

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Using the precise ephemeris and the precise satellite clock correction can realize precise point positioning ( PPP ) .

精密 单点 定位的实质就是利用精密星历和精密卫星钟改正来实现定位.

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Precision Analysis of Broadcast Ephemeris for Medium and High Orbit Satellites The given cases show that all the GLONASS broadcast ephemeris fitting errors are almost eliminated entirely.

中高轨卫星广播星历精度分析算例表明，该方法能够有效减弱GLONASS卫星广播星历的拟合误差，卫星位置的精度损失从0.5米降到毫米级；

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In his free time, Banneker wrote the Pennsylvania, Delaware , Maryland, and Virginia Almanac and Ephemeris.

闲暇之时, 班尼卡撰写有关宾州 、 德拉瓦 、 马里兰和维吉尼亚的农民历及星象历书.

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The broadcast ephemeris, which is the basic of satellite navigation, must be precise and real time.

导航卫星广播星历是卫星导航定位的基础, 要求有较高的精度和实时性.

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american ephemeris and nautical almanac

美国天文及航海历

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The Best Numerical Method for Making Precise Ephemeris of Synchronous Satellite

建立同步卫星精密星历表的最佳数值方法

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Ephemeris table computation synchronous satellite

星历表计算同步卫星

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The Effect of Different Ephemeris on the Exactness of GPS Data Processing airborne ECM set for self defence

不同卫星星历对GPS数据处理的影响

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The result indicates that GPS broadcast ephemeris parameter model has a higher accuracy, but GLONASS broadcast ephemeris parameters model has a quicker computation speed, which is suitable for determinating orbit which changes fast.

结果表明GPS广播星历参数模型具有更高的精度，但GLONASS广播星历参数模型具有计算速度快，适合轨道变化快的卫星定轨。

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Error analysis of prediction orbit determined by GLONASS ephemeris

基于GLONASS星历的预报轨道的误差分析

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The coordinates of the satellites are got according to the broadcast ephemeris received.

卫星的坐标是根据接收到的广播星历来计算的.

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GPS broadcasting ephemeris can be obtained momently by GPS users, it is very convenient for navigation and real-time orientation.

GPS广播星历能被GPS用户观测实时得到，这对导航和实时定位是非常方便的。

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Until the Eastern Han Dynasty, historian with the ephemeris officer is always unity.

直到东汉, 史官与星历官始终是合一的.

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IAU will adopt the Celestial Intermediate Pole ( CIP) as the celestial reference pole from 1 January 2003. The use of NRO in the Celestial Reference System ( CRS) is designated as the Celestial Ephemeris Origin ( CEO).

IAU决定从2003年起采用天球中间极作为天球参考极。

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Through example, analyzing positioning precise influence which broadcast ephemeris and precise ephemeris process different length baselines.

实例分析了广播星历和精密星历对于不同长度基线相对定位精度的影响.

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The emphasis is given on analysis to relationship of error sources to location accuracy on platform ephemeris, echo time delays, target elevation, Doppler center frequency and time clock etc.

着重分析了平台星历、回波时延、目标高度、多普勒中心频率和时钟等误差源与定位精度的关系。

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Satellite clock and broadcast ephemeris error correction model were introduced briefly.

介绍目前广域差分星历误差及卫星钟差所使用的改正模型。

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GPS ephemeris data interpolation, using Lagrange, Newton's Law, which is good information!

GPS星历内插资料, 分别采用拉格朗日, 牛顿法, 是不错的资料!

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The main error sources of satellite Doppler positioning, ephemeris error and refraction error, are correlated between stations simultaneously tracking a satellite pass. So satellite Doppler simultaneous observations can improve the accuracy of relative positioning between stations.

卫星多普勒定位主要误差源，星历误差和折射误差在同步跟踪一次卫星通过的两测站之间是相关的，因此卫星多普勒的同步观测能提高测站间相对定位的精度。

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