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artificial satellites
相关语句
  人造卫星
     History and Development of Artificial Satellites
     人造卫星的历史与发展
短句来源
     The approximate formula of the speed of the artificial satellites move at some spot
     人造卫星在某点运行速度的近似公式
短句来源
     A method for acquiring the tracks of artificial satellites is developed.
     为了开展人造卫星激光测距工作的实际需要,探索了一种拦截人造卫星的方法.
短句来源
     Based on the models of the perturbed ideal resonance in this paper, all kinds of the orbital resonances on ihe motions of artificial satellites are analyzed carefully, the characteristics of the corresponding orbital resonances and its evolutional properties are given, which provide a theoretical foundation for accepting or rejecting resonance terms in perturbing calculations.
     本文采用受摄理想共振模型,对人造卫星运动中所发生的各类轨道共振作一具体分析,给出相应的共振特征及其演化性态,为摄动计算中考虑共振项的取舍提供理论依据。
短句来源
     Meteorological conditions have direct and obvious effect on spacecrafts' launch, such as artificial satellites. It's the meso-scale strong convective weather(SCW for short afterwards) which is the difficulty and emphases of meteorological support in XiChang Satellite Launch Site (XSLS for short), especially the thunder weather.
     气象条件对人造卫星等航天器的发射具有直接而明显的影响,西昌发射场区气象保障的难点和重点是中尺度强对流天气,特别是强雷电天气。
短句来源
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  “artificial satellites”译为未确定词的双语例句
     VISUAL C++5.0 CALLS PROGRAMS OF THE ORBIT DETERMINATION FOR ARTIFICIAL SATELLITES IN WINDOWS 95
     Windows95环境下Visual C++5.0对人卫测轨软件的调用
短句来源
     Comparison of Air Densities from Air Drag upon Artificial Satellites With Models MSIS and CIRA 1972
     由卫星阻力测定的大气密度值与MSIS和CIRA1972模式的部分比对
短句来源
     PREDICTING EPHEMERIS AND VISIBLE PERIODS OF ARTIFICIAL SATELLITES USING AN ELECTRONIC COMPUTER
     用电子计算机预报人卫星历表和可见期
短句来源
     Based on the analytical model of the density of atmosphere which is derived from CIRA 1972,the present paper gives the expression of orbital elements of the density of atmosphere. It can be used directly for the analytic type perturbation calculation of artificial satellites.
     本文在根据国际参考大气1972(CIRA 1972)导出的大气密度的分析模型的基础上,给出了它的轨道根数表达式,可供卫星分析型摄动直接采用。
短句来源
     A METHOD FOR ACQUIRING THE TRACKS OF ARTIFICIAL SATELLITES
     拦截人造卫星的一种方法
短句来源
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  相似匹配句对
     Types of Artificial Satellites
     人造卫星的类型
短句来源
     History and Development of Artificial Satellites
     人造卫星的历史与发展
短句来源
     ARTIFICIAL MARBLE
     人造“大理石”
短句来源
     ARTIFICIAL SEED
     人工种子
短句来源
     Satellites of love
     卫星导航路路通
短句来源
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  artificial satellites
On the determination of the shape and dimensions of the earth from observations of artificial satellites
      
Local changes in the earth's gravistatic field and the generation of a gravidynamic field during earthquakes will cause variations in the trajectories of the moon and artificial satellites.
      
We used the data on radio probing of the AIT region at a frequency of 150 MHz by signals from artificial satellites in near-polar circular orbits at altitudes of 1000 km above the Earth's surface.
      
Choice of a model of the motion for determining the orientation of artificial satellites
      
A review is given of the work done in the field of ionospheric guided propagation of HF radio signals from artificial satellites.
      
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Re-entry of an artificial satellite is a very complicated problem. It is related to many scientific theories and technical problems. This paper discusses only the re-entry orbit. Some reasonable re-entry orbits of a manned space-ship are presented. Safe return to the earth's surface is ensured by utilizing terrestrial aerodynamical forces (drag and lifting forces), and the main point is to solve the problem of large deceleration. This work commences from the differential equations of motion of an artificial...

Re-entry of an artificial satellite is a very complicated problem. It is related to many scientific theories and technical problems. This paper discusses only the re-entry orbit. Some reasonable re-entry orbits of a manned space-ship are presented. Safe return to the earth's surface is ensured by utilizing terrestrial aerodynamical forces (drag and lifting forces), and the main point is to solve the problem of large deceleration. This work commences from the differential equations of motion of an artificial satellite with respect to the effects of the gravitational force and the aerodynamical forces of the earth. Firstly, approximate analytical solutions are obtained, expressed by formulae (11) and (12), then from these, two ways are found for solving reasonably the problem of large deceleration (maximum value not exceeding six times the gravitational acceleration on the earth's surface): one is to vary the coefficient of drag; the other is to utilize small suitable lifting force (or ratio of drag and lift). Further, according to these two ways, three kinds of re-entry orbits are calculated by precise numerical method. On selecting suitable initial values, the results of calculation show that these three kinds of orbits can be used to solve the problem of large deceleration, and can minimize the difficulty of the aerodynamical heat. In the last part, the effect of the oblateness of the earth's atmosphere with respect to the re-entry orbit is discussed. The result of calculation shows that this effect is negligible.

本文讨论利用地球大气动力(阻力和升力)来设计载人飞船安全返航的、主要解决超重问题的合理轨道。从卫星在地球引力和大气动力作用下的运动方程出发,先得到近似分析解(11)和(12)式。由它们得到合理解决超重(最大值小于地面重力的六倍)的两种方案:一是改变阻力;另一是用适当的小升力。然后根据这两个方案用数值方法计算了三种返航轨道。在适当选取初始值时,这三种轨道都可以合理地解决超重问题,同时也能减轻防热困难。最后讨论了地球大气扁率对返航轨道的影响,计算结果表明,它的影响是可以忽略的。

In this paper a quasi-atmospheric model for computing optical atmospheric re- fraction is constructed,and formulas for computing optical refraction for objects in- side or outside the atmosphere,particularly for artificial satellites,are derived.In precision these formulas are comparable with the numerical integration method,but more convenient for use.

本文提出一种适用于大气光学折射计算的准大气模式;并推导出计算大气内外目标的光学折射公式,特别是计算人造卫星大气折射的公式,在精度方面可与数值积分相比,但便于实践中使用。

We discuss the problem of using the arcs of great and small circle of celestial sphere to approximate the artificial satellite's apparent tracks,and compared the structural features of the triaxial and quadraxial tracking frames of current Satel- lite-Camera. A method is proposed to determine quantitatively the parameters of the tracking frames and criterions are suggested for a reasonable choice of the tracking-frame in its structural designs. Finally we discuss the influence of the apparent angular accelerations...

We discuss the problem of using the arcs of great and small circle of celestial sphere to approximate the artificial satellite's apparent tracks,and compared the structural features of the triaxial and quadraxial tracking frames of current Satel- lite-Camera. A method is proposed to determine quantitatively the parameters of the tracking frames and criterions are suggested for a reasonable choice of the tracking-frame in its structural designs. Finally we discuss the influence of the apparent angular accelerations of arti- ficial satellites on the constant-rate photographic tracking.

一、前言大家知道,人造卫星在天球上运动很快,利用固定装置的人造卫星照相机拍摄,有效露光时间 T 极短,大大限制了拍摄人造卫星的能力.T=d/Fω=d/v其中,d 是底片上星象弥散(圆)直径;F 是照相机的焦距;ω是卫星相对仪器的运动角速度;v 是卫星星象在底片上的运动线速度.

 
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