图片是过去十年间由美国间谍卫星拍摄的，它们证实了，在最近几年，大面积高纬度区域在夏天失去了冰层的覆盖。
The photographs, taken by spy satellites over the past decade, confirm that in recent years vast areas in high latitudes have lost their ice cover in summer months.
这里显示的勒拿河三角洲，是美国地球资源卫星7号2000年拍摄的假彩色图片，覆盖了拉普捷夫海（Laptev Sea）上超过一万一千平方英里的区域。
The Lena’s delta, shown here in a false-color image taken by the Landsat 7 satellite in 2000, covers more than 11,000 square miles on the Laptev Sea.
新网络将保持66颗跨链低轨卫星的星座体系，覆盖全球所有区域。
The new network will maintain the Iridium constellation architecture of 66 cross-linked LEO satellites covering 100 percent of the globe.
覆盖面-某个卫星信号覆盖的区域。有些卫星信号覆盖面非常大，达整个地球的三分之一，例如卫星或手提电话系统等。
Footprint - the area in which a specific transmission can be received. Some footprints cover as much as one-third of the earth, such as satellite or cell systems.
针对区域覆盖卫星星座的优化设计问题，设计了一种能同时优化星座结构和参数的进化算法。
This paper presents an evolutionary algorithm to simultaneously optimize constellation structure and parameters for regional coverage satellite constellation design.
这样，卫星在SBS2的覆盖区域内选择中继节点。
In this case, satellite selects a relay node in the coverage region of SBS2.
该文讨论了使用中轨共地面轨迹星座建立区域覆盖卫星通信系统的优化设计方法。
An optimization design method for implementing regional coverage satellite system with common-track constellation is proposed.
首先分析了GPS卫星对特定区域的覆盖情况，然后针对不同位置的GPS卫星失效，考察对GPS导航精度即目标区域GDOP值的影响，并通过仿真予以验证。
Then according to the voidness of GPS satellites in different position, the effect on navigation accuracy of GPS(that is GDOP)is studied. The validity of voidness strategy is proved by simulation.
遥感技术可作为海岸线变化监测的有利工具，特别是卫星遥感很适合于动态变化的探测，因为它可以对相同的地区进行重复性观测，且能覆盖很大的区域。
Remote Sensing especially the satellite imagery is an available tool to monitor the changes of coastline, because it can cover a large area and observe the same zone repeatedly.
本文提出一种新的卫星星座优化方法，得出最优的区域覆盖星座，并给出了应用实例。
A new method is introduced for optimizing satellite constellations. By which, the best satellite constellations for zonal coverage are derived. And application example is also presented in the paper.
根据区域性探测卫星系统的特点，提出了利用太阳同步轨道间歇性区域性覆盖特定区域的轨道设计方案。
According to characteristic of regional exploring satellite system, an intermittent regional covering orbit design scheme is proposed using circular sun synchronization orbit.
对地静止轨道上的卫星的主要作用是，一天二十四小时和覆盖区域中的地面站进行通信。
The primary value of satellite in a geostationary orbit is its ability to communicate with ground stations in its coverage area 24 hours a day.
仿真结果表明，该类型星座能够以较少数量的卫星为我国提供良好的覆盖性能，适于我国的区域覆盖卫星通信系统采用。
Simulation results show that the optimal common-track constellation can provide favorable coverage performance to China with fewer satellites, and hence is appro.
静止轨道卫星由于覆盖区域大、轨道位置确定、运行稳定等特点，在国民经济和军事领域得到了广泛的应用。
It plays a crucial role in safeguarding national interests. Geosynchronous satellite takes on broad application because wide coverage, operation stabilization, etc.
区域目标相对星载遥感器的视场较大，需卫星多次观测才能完全覆盖，难以在较短的时间内获取其完整的遥感数据。
Area target usually covers a large area and it takes a long mission-complete time for a satellite to cover it completely, which makes the image request difficult to satisfy in a reasonable time.
区域目标相对星载遥感器的视场较大，需卫星多次观测才能完全覆盖，难以在较短的时间内获取其完整的遥感数据。
Area target usually covers a large area and it takes a long mission-complete time for a satellite to cover it completely, which makes the image request difficult to satisfy in a reasonable time.
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