查询词典 ephemeris

The results show that the positional precision for each star is comparable to or better than the best observations of Uranian satellites that is used to improve their ephemeris.

结果表明，相对于天王星卫星确实可以精确测定同一CCD视场中暗恒星的位置，位置测量的精度和国外最好的天王星卫星位置测量的精度相当或更高。

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。

If the establishment of celestial ephemeris, almanac forecast of certain astronomical phenomena, as the content of astronomy, it is a very old subjects.

如果把编制天体历表，预报某些天象作为历书天文学的内容，它是一个很古老的学科。

A final has an accuracy of 5cm for the precise ephemeris and 0.1~0.2ns for the clock information.

本文研究了利用随机游走过程模拟对流层延迟残差随机变化的方法。

A method to acquire and track the beacon for deep space optical communication system is proposed, which uses star as beacon, and controls the direction of down beam based on the absolute position in inertial frame, the ephemeris of aircraft and earth and the attitude of aircraft.

提出一种深空光通信系统的信标捕获、跟踪方案，该方案是以恒星作为信标，根据恒星在惯性坐标系中的绝对位置信息，基于航天器和地球星历表、航天器的姿态信息来进行下行光束瞄准方向的精确控制。

In order to calculate the satellite orbit in GPS data process,it is more efficient to use polynomial methods to fit the orbit curve with the parameters of GPS broadcast ephemeris.

利用多项式拟合的方法计算GPS卫星在轨坐标时，使用正交多项式可有效避免计算过程中出现的病态矩阵。

GPS ; broadcast ephemeris ; satellite coordinates ; orthogonal polynomial ; curve-fitting

GPS ；广播星历；卫星坐标；正交多项式；拟合

In this approach, double-differenced dual-frequency phase measurements and the known coordinates of reference stations as well as the precise ephemeris are used to rebuild observation equation, and then a Kalman filter is designed for the parameters estimation, i.e. ionosphere delay etc.

该算法使用双差双频相位、参考站精确的坐标和精密星历构造观测量，并用卡尔曼滤波来估计电离层参数，在给定显著水平的情况下，可以使用单个或少量历元以假设检验的方法探测和修复周跳。

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。

IDL interface to JPL/SPICE - spice-dlm provides a seamless mechanism for IDL users to access the SPICE library from JPL/NAIF, providing ephemeris information for solar system objects and spacecraft.

spice-dlm为IDL用户提供了一个无缝的机制以从JPL/NAIF中访问SPICE库，它提供了有关太阳系中的天体和太空船的星历信息。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐