near-earth

A new method for measuring near-earth orbit ballistic parameters of multi, faint, small and dim targets is proposed on the basis of analysis and demonstration of sensor selection for multi-target detection, target extraction and data processing.

在对多目标探测所用传感器的选择、目标提取和数据处理等三方面技术问题进行分析论证的基础上，提出了一种新的多、弱、小、暗目标近地弹道参数测量方法。

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In this paper we did research on the heat flow, temperature, structural changes, and their influencing factors of parabolic satellite antenna in near-earth orbit, which provides future theoretical references for antenna thermal and structural design.

本文以抛物面型星载天线为研究对象，分析其在近地轨运行时的外热流、温度场和结构场的变化情况和影响因素，为天线的热设计和结构设计提供理论依据。

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NASA asteroid expert Don Yeomans, head of the agency's Near-Earth Object Program Office, told SPACE.com that the object which exploded over a thinly inhabited stretch of eastern Europe today was most likely an exploding fireball known as a bolide.

美国宇航局小行星专家、近地天体项目办公室负责人唐-耶麦斯告诉SPACE.com网站，在人烟稀少的远东地区上空爆炸的这颗天体很有可能是一颗火球，也称为火流星。

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Study on the Near-Earth Magnetotail Dynamics: Based on Double Star TC-1 Spacecraft Observations

基于双星计划TC-1卫星观测的近地磁尾动力学研究

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The space experiments are carried out in the chinese sixteenth scientific and technological exploration satellite. The satellite was flew around the near-earth orbit about 15 days.

空间实验是在我国第16颗科学探测与技术试验卫星上进行的，卫星在近地轨道运行15天。

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If we keep on wasting so much paper, there will not be any trees left on the earth some day in the near future.

如果我们继续浪费这么多的纸，在不久的将来，地球上将不再剩下任何树木。

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Gargantuan asteroid to pass near Earth this fall.

大量小行星今秋将与地球错身而过.

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Asteroid hunters have found about 903 of an estimated 1050 near-Earth objects ( NEOs) with diameters of 1 kilometer or greater as of October 1. That still leaves well over 100 objects in the 1-2 kilometer size undiscovered.

据估计，截至10月初，直径大于等于1000米的近地小行星约有1050个，行星探测器已发现903个，而还有100多个直径为1000到2000米的小行星尚待发掘。

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Because of the deep-space probe missions and objectives, its thermal environment is very different from the near-Earth satellites'.

深空探测器由于飞行任务和探测目标的原因，其热环境与近地卫星有很大的差异。

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The Influence of Solar Sunspots Electromagnetic Radiation on Space Near Earth

太阳黑子活动对近地空间的电磁辐射影响

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The Correlation Between the Solar Constant and the Near-Earth Space Enoironment' and Earth's Rotation

太阳常数与近地环境和地球自转相关性的探讨

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Systems analyzed on the design principle of near-earth orbit, regression orbit, stationary orbit, critical orbit and construction orbit. Base on this, a orbit design model is given.

系统研究了近地轨道、太阳同步轨道、回归轨道、静止轨道、临界和冻结轨道的设计原理，在此基础上，建立了轨道设计模型。

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TT monitoring: tt China has established an integrated TT network comprising TT ground stations and ships, which has successfully accomplished TT missions for near-earth orbit and geo-stationary orbit satellites, and experimental spacecraft.

航天测控。中国已建成完整的航天测控网，包括陆地测控站和海上测控船，圆满完成了从近地轨道卫星到地球静止轨道卫星、从卫星到试验飞船的航天测控任务。

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Space debris will make available space in the outer space more and more crowded. In particular, the pollution of near-earth orbit space will increase the accident rate in the outer space.

空间碎片会使外空可利用空间越来越拥挤，尤其对于近地轨道空间的污染，会加大外空事故率。

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The static model and survey model about the near-earth space environment element were advanced.

提出了近地空间环境要素三维建模的静态模型和实测模型.

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In this paper, the problem of orbital design of landing moon detector is discussed which starts from near earth circular parking orbit, produces thrust in velocity direction, entries landing moon orbit, and hits the moon with on guiding and free flight.

讨论了探测器从低高度圆型地球停泊轨道出发，沿速度方向施加脉冲推力进入登月轨道，不加制导自由飞行击中月球的轨道设计问题。

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We've mapped more than a thousand near-earth objects.

我们探明了超过1000个的近地物体.

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Even its visibility from near-earth orbit is questionable.

甚至从近地球轨道其可见度是值得怀疑的.

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The energy of solar radiation is mainly concentrated within the bands of visible and near infrared, in which, most of the energy can reach ground and heat the earth surface.

太阳辐射能主要分布在可见和近红外波段，大部分可以照射到地面从而加热地面。

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As a hot spot on the research of space navigation in recent years, X-ray Pulsar-based Navigation ( XPNAV) can offer abundant navigation information, such as position, velocity, attitude and time etc. for the spacecrafts in near-Earth orbit, deep space and interplanetary space.

X射线脉冲星导航（X-ray Pulsar-based Navigation，XPNAV）是近几年空间导航领域研究的热点，可为近地轨道、深空及星际空间飞行的航天器提供位置、速度、姿态和时间等全面的导航信息。

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The property can offer position, velocity, and accurate time navigation information for the spacecrafts in near-earth orbit, geostationary orbit, elliptic orbit or interplanetary orbit.

这一特性使其能够为近地轨道、地球同步轨道、大椭圆地球轨道、地月轨道及星际空间飞行的航天器提供位置、速度和时间等丰富的导航信息。

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Three-axis stabilized attitude control system for Chinese near earth orbit satellites

中国近地轨道卫星三轴稳定姿态控制系统

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Horizontal distribution near earth's surface.

近地面水平分布气流线M52.

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